Add auxiliary methods to acl for getting records, export peer manager

Acl sync protocol

Makefile

@@ -20,6 +20,7 @@ proto:
 	protoc --gogofaster_out=$(PKGMAP):. --go-drpc_out=protolib=github.com/gogo/protobuf:. net/streampool/testservice/protos/*.proto
 	protoc --gogofaster_out=:. net/secureservice/handshake/handshakeproto/protos/*.proto
 	protoc --gogofaster_out=$(PKGMAP):. --go-drpc_out=protolib=github.com/gogo/protobuf:. coordinator/coordinatorproto/protos/*.proto
+	protoc --gogofaster_out=:. --go-drpc_out=protolib=github.com/gogo/protobuf:. consensus/consensusproto/protos/*.proto
 
 deps:
 	go mod download

accountservice/mock_accountservice/helper.go

@@ -3,7 +3,7 @@ package mock_accountservice
 import (
 	"github.com/anyproto/any-sync/accountservice"
 	"github.com/anyproto/any-sync/commonspace/object/accountdata"
-	"github.com/golang/mock/gomock"
+	"go.uber.org/mock/gomock"
 )
 
 func NewAccountServiceWithAccount(ctrl *gomock.Controller, acc *accountdata.AccountKeys) *MockService {

accountservice/mock_accountservice/mock_accountservice.go

@@ -9,7 +9,7 @@ import (
 
 	app "github.com/anyproto/any-sync/app"
 	accountdata "github.com/anyproto/any-sync/commonspace/object/accountdata"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockService is a mock of Service interface.

app/app.go

@@ -55,11 +55,13 @@ type ComponentStatable interface {
 // App is the central part of the application
 // It contains and manages all components
 type App struct {
+	parent         *App
 	components     []Component
 	mu             sync.RWMutex
 	startStat      Stat
 	stopStat       Stat
 	deviceState    int
+	versionName    string
 	anySyncVersion string
 }
 
@@ -77,6 +79,19 @@ func (app *App) Version() string {
 	return GitSummary
 }
 
+// SetVersionName sets the custom application version
+func (app *App) SetVersionName(v string) {
+	app.versionName = v
+}
+
+// VersionName returns a string with the settled app version or auto-generated version if it didn't set
+func (app *App) VersionName() string {
+	if app.versionName != "" {
+		return app.versionName
+	}
+	return AppName + ":" + GitSummary + "/any-sync:" + app.AnySyncVersion()
+}
+
 type Stat struct {
 	SpentMsPerComp map[string]int64
 	SpentMsTotal   int64
@@ -109,6 +124,16 @@ func VersionDescription() string {
 	return fmt.Sprintf("build on %s from %s at #%s(%s)", BuildDate, GitBranch, GitCommit, GitState)
 }
 
+// ChildApp creates a child container which has access to parent's components
+// It doesn't call Start on any of the parent's components
+func (app *App) ChildApp() *App {
+	return &App{
+		parent:         app,
+		deviceState:    app.deviceState,
+		anySyncVersion: app.AnySyncVersion(),
+	}
+}
+
 // Register adds service to registry
 // All components will be started in the order they were registered
 func (app *App) Register(s Component) *App {
@@ -128,10 +153,14 @@ func (app *App) Register(s Component) *App {
 func (app *App) Component(name string) Component {
 	app.mu.RLock()
 	defer app.mu.RUnlock()
-	for _, s := range app.components {
-		if s.Name() == name {
-			return s
+	current := app
+	for current != nil {
+		for _, s := range current.components {
+			if s.Name() == name {
+				return s
+			}
 		}
+		current = current.parent
 	}
 	return nil
 }
@@ -149,10 +178,14 @@ func (app *App) MustComponent(name string) Component {
 func MustComponent[i any](app *App) i {
 	app.mu.RLock()
 	defer app.mu.RUnlock()
-	for _, s := range app.components {
-		if v, ok := s.(i); ok {
-			return v
+	current := app
+	for current != nil {
+		for _, s := range current.components {
+			if v, ok := s.(i); ok {
+				return v
+			}
 		}
+		current = current.parent
 	}
 	empty := new(i)
 	panic(fmt.Errorf("component with interface %T is not found", empty))
@@ -162,9 +195,13 @@ func MustComponent[i any](app *App) i {
 func (app *App) ComponentNames() (names []string) {
 	app.mu.RLock()
 	defer app.mu.RUnlock()
-	names = make([]string, len(app.components))
-	for i, c := range app.components {
-		names[i] = c.Name()
+	names = make([]string, 0, len(app.components))
+	current := app
+	for current != nil {
+		for _, c := range current.components {
+			names = append(names, c.Name())
+		}
+		current = current.parent
 	}
 	return
 }
@@ -225,6 +262,15 @@ func (app *App) Start(ctx context.Context) (err error) {
 	return
 }
 
+// IterateComponents iterates over all registered components. It's safe for concurrent use.
+func (app *App) IterateComponents(fn func(Component)) {
+	app.mu.RLock()
+	defer app.mu.RUnlock()
+	for _, s := range app.components {
+		fn(s)
+	}
+}
+
 func stackAllGoroutines() []byte {
 	buf := make([]byte, 1024)
 	for {

app/app_test.go

@@ -34,6 +34,40 @@ func TestAppServiceRegistry(t *testing.T) {
 		names := app.ComponentNames()
 		assert.Equal(t, names, []string{"c1", "r1", "s1"})
 	})
+	t.Run("Child MustComponent", func(t *testing.T) {
+		app := app.ChildApp()
+		app.Register(newTestService(testTypeComponent, "x1", nil, nil))
+		for _, name := range []string{"c1", "r1", "s1", "x1"} {
+			assert.NotPanics(t, func() { app.MustComponent(name) }, name)
+		}
+		assert.Panics(t, func() { app.MustComponent("not-registered") })
+	})
+	t.Run("Child ComponentNames", func(t *testing.T) {
+		app := app.ChildApp()
+		app.Register(newTestService(testTypeComponent, "x1", nil, nil))
+		names := app.ComponentNames()
+		assert.Equal(t, names, []string{"x1", "c1", "r1", "s1"})
+	})
+	t.Run("Child override", func(t *testing.T) {
+		app := app.ChildApp()
+		app.Register(newTestService(testTypeRunnable, "s1", nil, nil))
+		_ = app.MustComponent("s1").(*testRunnable)
+	})
+}
+
+func TestApp_IterateComponents(t *testing.T) {
+	app := new(App)
+
+	app.Register(newTestService(testTypeRunnable, "c1", nil, nil))
+	app.Register(newTestService(testTypeRunnable, "r1", nil, nil))
+	app.Register(newTestService(testTypeComponent, "s1", nil, nil))
+
+	var got []string
+	app.IterateComponents(func(s Component) {
+		got = append(got, s.Name())
+	})
+
+	assert.ElementsMatch(t, []string{"c1", "r1", "s1"}, got)
 }
 
 func TestAppStart(t *testing.T) {

app/ldiff/mock_ldiff/mock_ldiff.go

@@ -9,7 +9,7 @@ import (
 	reflect "reflect"
 
 	ldiff "github.com/anyproto/any-sync/app/ldiff"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockDiff is a mock of Diff interface.

app/ocache/entry.go

@@ -2,9 +2,10 @@ package ocache
 
 import (
 	"context"
-	"go.uber.org/zap"
 	"sync"
 	"time"
+
+	"go.uber.org/zap"
 )
 
 type entryState int
@@ -25,6 +26,7 @@ type entry struct {
 	value     Object
 	close     chan struct{}
 	mx        sync.Mutex
+	cancel    context.CancelFunc
 }
 
 func newEntry(id string, value Object, state entryState) *entry {
@@ -49,6 +51,20 @@ func (e *entry) isClosing() bool {
 	return e.state == entryStateClosed || e.state == entryStateClosing
 }
 
+func (e *entry) setCancel(cancel context.CancelFunc) {
+	e.mx.Lock()
+	defer e.mx.Unlock()
+	e.cancel = cancel
+}
+
+func (e *entry) cancelLoad() {
+	e.mx.Lock()
+	defer e.mx.Unlock()
+	if e.cancel != nil {
+		e.cancel()
+	}
+}
+
 func (e *entry) waitLoad(ctx context.Context, id string) (value Object, err error) {
 	select {
 	case <-ctx.Done():

app/ocache/ocache.go

@@ -3,10 +3,11 @@ package ocache
 import (
 	"context"
 	"errors"
-	"github.com/anyproto/any-sync/app/logger"
-	"go.uber.org/zap"
 	"sync"
 	"time"
+
+	"github.com/anyproto/any-sync/app/logger"
+	"go.uber.org/zap"
 )
 
 var (
@@ -157,7 +158,10 @@ func (c *oCache) Pick(ctx context.Context, id string) (value Object, err error)
 
 func (c *oCache) load(ctx context.Context, id string, e *entry) {
 	defer close(e.load)
+	ctx, cancel := context.WithCancel(ctx)
+	e.setCancel(cancel)
 	value, err := c.loadFunc(ctx, id)
+	cancel()
 
 	c.mu.Lock()
 	defer c.mu.Unlock()
@@ -315,6 +319,7 @@ func (c *oCache) Close() (err error) {
 	close(c.closeCh)
 	var toClose []*entry
 	for _, e := range c.data {
+		e.cancelLoad()
 		toClose = append(toClose, e)
 	}
 	c.mu.Unlock()

app/ocache/ocache_test.go

@@ -386,6 +386,25 @@ func Test_OCache_Remove(t *testing.T) {
 	})
 }
 
+func TestOCacheCancelWhenRemove(t *testing.T) {
+	c := New(func(ctx context.Context, id string) (value Object, err error) {
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}, WithTTL(time.Millisecond*10))
+	stopLoad := make(chan struct{})
+	var err error
+	go func() {
+		_, err = c.Get(context.TODO(), "id")
+		stopLoad <- struct{}{}
+	}()
+	time.Sleep(time.Millisecond * 10)
+	c.Close()
+	<-stopLoad
+	require.Equal(t, context.Canceled, err)
+}
+
 func TestOCacheFuzzy(t *testing.T) {
 	t.Run("test many objects gc, get and remove simultaneously, close after", func(t *testing.T) {
 		tryCloseIds := make(map[string]bool)

commonspace/commongetter.go

@@ -1,62 +0,0 @@
-package commonspace
-
-import (
-	"context"
-	"github.com/anyproto/any-sync/commonspace/object/syncobjectgetter"
-	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
-	"github.com/anyproto/any-sync/commonspace/object/treemanager"
-	"sync/atomic"
-)
-
-type commonGetter struct {
-	treemanager.TreeManager
-	spaceId         string
-	reservedObjects []syncobjectgetter.SyncObject
-	spaceIsClosed   *atomic.Bool
-}
-
-func newCommonGetter(spaceId string, getter treemanager.TreeManager, spaceIsClosed *atomic.Bool) *commonGetter {
-	return &commonGetter{
-		TreeManager:   getter,
-		spaceId:       spaceId,
-		spaceIsClosed: spaceIsClosed,
-	}
-}
-
-func (c *commonGetter) AddObject(object syncobjectgetter.SyncObject) {
-	c.reservedObjects = append(c.reservedObjects, object)
-}
-
-func (c *commonGetter) GetTree(ctx context.Context, spaceId, treeId string) (objecttree.ObjectTree, error) {
-	if c.spaceIsClosed.Load() {
-		return nil, ErrSpaceClosed
-	}
-	if obj := c.getReservedObject(treeId); obj != nil {
-		return obj.(objecttree.ObjectTree), nil
-	}
-	return c.TreeManager.GetTree(ctx, spaceId, treeId)
-}
-
-func (c *commonGetter) getReservedObject(id string) syncobjectgetter.SyncObject {
-	for _, obj := range c.reservedObjects {
-		if obj != nil && obj.Id() == id {
-			return obj
-		}
-	}
-	return nil
-}
-
-func (c *commonGetter) GetObject(ctx context.Context, objectId string) (obj syncobjectgetter.SyncObject, err error) {
-	if c.spaceIsClosed.Load() {
-		return nil, ErrSpaceClosed
-	}
-	if obj := c.getReservedObject(objectId); obj != nil {
-		return obj, nil
-	}
-	t, err := c.TreeManager.GetTree(ctx, c.spaceId, objectId)
-	if err != nil {
-		return
-	}
-	obj = t.(syncobjectgetter.SyncObject)
-	return
-}

commonspace/config/config.go

@@ -1,4 +1,4 @@
-package commonspace
+package config
 
 type ConfigGetter interface {
 	GetSpace() Config

commonspace/credentialprovider/credentialprovider.go

@@ -3,6 +3,7 @@ package credentialprovider
 
 import (
 	"context"
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 )
 
@@ -13,12 +14,21 @@ func NewNoOp() CredentialProvider {
 }
 
 type CredentialProvider interface {
+	app.Component
 	GetCredential(ctx context.Context, spaceHeader *spacesyncproto.RawSpaceHeaderWithId) ([]byte, error)
 }
 
 type noOpProvider struct {
 }
 
+func (n noOpProvider) Init(a *app.App) (err error) {
+	return nil
+}
+
+func (n noOpProvider) Name() (name string) {
+	return CName
+}
+
 func (n noOpProvider) GetCredential(ctx context.Context, spaceHeader *spacesyncproto.RawSpaceHeaderWithId) ([]byte, error) {
 	return nil, nil
 }

commonspace/credentialprovider/mock_credentialprovider/mock_credentialprovider.go

@@ -8,8 +8,9 @@ import (
 	context "context"
 	reflect "reflect"
 
+	app "github.com/anyproto/any-sync/app"
 	spacesyncproto "github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockCredentialProvider is a mock of CredentialProvider interface.
@@ -49,3 +50,31 @@ func (mr *MockCredentialProviderMockRecorder) GetCredential(arg0, arg1 interface
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetCredential", reflect.TypeOf((*MockCredentialProvider)(nil).GetCredential), arg0, arg1)
 }
+
+// Init mocks base method.
+func (m *MockCredentialProvider) Init(arg0 *app.App) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Init", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Init indicates an expected call of Init.
+func (mr *MockCredentialProviderMockRecorder) Init(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockCredentialProvider)(nil).Init), arg0)
+}
+
+// Name mocks base method.
+func (m *MockCredentialProvider) Name() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Name")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Name indicates an expected call of Name.
+func (mr *MockCredentialProviderMockRecorder) Name() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Name", reflect.TypeOf((*MockCredentialProvider)(nil).Name))
+}

commonspace/deletion_test.go

@@ -73,13 +73,14 @@ func TestSpaceDeleteIds(t *testing.T) {
 	fx.treeManager.space = spc
 	err = spc.Init(ctx)
 	require.NoError(t, err)
-
+	close(fx.treeManager.waitLoad)
+	
 	var ids []string
 	for i := 0; i < totalObjs; i++ {
 		// creating a tree
 		bytes := make([]byte, 32)
 		rand.Read(bytes)
-		doc, err := spc.CreateTree(ctx, objecttree.ObjectTreeCreatePayload{
+		doc, err := spc.TreeBuilder().CreateTree(ctx, objecttree.ObjectTreeCreatePayload{
 			PrivKey:     acc.SignKey,
 			ChangeType:  "some",
 			SpaceId:     spc.Id(),
@@ -88,7 +89,7 @@ func TestSpaceDeleteIds(t *testing.T) {
 			Timestamp:   time.Now().Unix(),
 		})
 		require.NoError(t, err)
-		tr, err := spc.PutTree(ctx, doc, nil)
+		tr, err := spc.TreeBuilder().PutTree(ctx, doc, nil)
 		require.NoError(t, err)
 		ids = append(ids, tr.Id())
 		tr.Close()
@@ -106,7 +107,7 @@ func TestSpaceDeleteIds(t *testing.T) {
 func createTree(t *testing.T, ctx context.Context, spc Space, acc *accountdata.AccountKeys) string {
 	bytes := make([]byte, 32)
 	rand.Read(bytes)
-	doc, err := spc.CreateTree(ctx, objecttree.ObjectTreeCreatePayload{
+	doc, err := spc.TreeBuilder().CreateTree(ctx, objecttree.ObjectTreeCreatePayload{
 		PrivKey:     acc.SignKey,
 		ChangeType:  "some",
 		SpaceId:     spc.Id(),
@@ -115,7 +116,7 @@ func createTree(t *testing.T, ctx context.Context, spc Space, acc *accountdata.A
 		Timestamp:   time.Now().Unix(),
 	})
 	require.NoError(t, err)
-	tr, err := spc.PutTree(ctx, doc, nil)
+	tr, err := spc.TreeBuilder().PutTree(ctx, doc, nil)
 	require.NoError(t, err)
 	tr.Close()
 	return tr.Id()
@@ -147,9 +148,10 @@ func TestSpaceDeleteIdsIncorrectSnapshot(t *testing.T) {
 	// adding space to tree manager
 	fx.treeManager.space = spc
 	err = spc.Init(ctx)
+	close(fx.treeManager.waitLoad)
 	require.NoError(t, err)
 
-	settingsObject := spc.(*space).settingsObject
+	settingsObject := spc.(*space).app.MustComponent(settings.CName).(settings.Settings).SettingsObject()
 	var ids []string
 	for i := 0; i < totalObjs; i++ {
 		id := createTree(t, ctx, spc, acc)
@@ -183,17 +185,19 @@ func TestSpaceDeleteIdsIncorrectSnapshot(t *testing.T) {
 	spc, err = fx.spaceService.NewSpace(ctx, sp)
 	require.NoError(t, err)
 	require.NotNil(t, spc)
+	fx.treeManager.waitLoad = make(chan struct{})
 	fx.treeManager.space = spc
 	fx.treeManager.deletedIds = nil
 	err = spc.Init(ctx)
 	require.NoError(t, err)
+	close(fx.treeManager.waitLoad)
 
 	// waiting until everything is deleted
 	time.Sleep(3 * time.Second)
 	require.Equal(t, len(ids), len(fx.treeManager.deletedIds))
 
 	// checking that new snapshot will contain all the changes
-	settingsObject = spc.(*space).settingsObject
+	settingsObject = spc.(*space).app.MustComponent(settings.CName).(settings.Settings).SettingsObject()
 	settings.DoSnapshot = func(treeLen int) bool {
 		return true
 	}
@@ -230,8 +234,9 @@ func TestSpaceDeleteIdsMarkDeleted(t *testing.T) {
 	fx.treeManager.space = spc
 	err = spc.Init(ctx)
 	require.NoError(t, err)
+	close(fx.treeManager.waitLoad)
 
-	settingsObject := spc.(*space).settingsObject
+	settingsObject := spc.(*space).app.MustComponent(settings.CName).(settings.Settings).SettingsObject()
 	var ids []string
 	for i := 0; i < totalObjs; i++ {
 		id := createTree(t, ctx, spc, acc)
@@ -259,10 +264,12 @@ func TestSpaceDeleteIdsMarkDeleted(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, spc)
 	fx.treeManager.space = spc
+	fx.treeManager.waitLoad = make(chan struct{})
 	fx.treeManager.deletedIds = nil
 	fx.treeManager.markedIds = nil
 	err = spc.Init(ctx)
 	require.NoError(t, err)
+	close(fx.treeManager.waitLoad)
 
 	// waiting until everything is deleted
 	time.Sleep(3 * time.Second)

commonspace/deletionstate/deletionstate.go

@@ -1,16 +1,22 @@
-//go:generate mockgen -destination mock_settingsstate/mock_settingsstate.go github.com/anyproto/any-sync/commonspace/settings/settingsstate ObjectDeletionState,StateBuilder,ChangeFactory
-package settingsstate
+//go:generate mockgen -destination mock_deletionstate/mock_deletionstate.go github.com/anyproto/any-sync/commonspace/deletionstate ObjectDeletionState
+package deletionstate
 
 import (
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"go.uber.org/zap"
 	"sync"
 )
 
+var log = logger.NewNamed(CName)
+
+const CName = "common.commonspace.deletionstate"
+
 type StateUpdateObserver func(ids []string)
 
 type ObjectDeletionState interface {
+	app.Component
 	AddObserver(observer StateUpdateObserver)
 	Add(ids map[string]struct{})
 	GetQueued() (ids []string)
@@ -28,12 +34,20 @@ type objectDeletionState struct {
 	storage              spacestorage.SpaceStorage
 }
 
-func NewObjectDeletionState(log logger.CtxLogger, storage spacestorage.SpaceStorage) ObjectDeletionState {
+func (st *objectDeletionState) Init(a *app.App) (err error) {
+	st.storage = a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	return nil
+}
+
+func (st *objectDeletionState) Name() (name string) {
+	return CName
+}
+
+func New() ObjectDeletionState {
 	return &objectDeletionState{
 		log:     log,
 		queued:  map[string]struct{}{},
 		deleted: map[string]struct{}{},
-		storage: storage,
 	}
 }
 

commonspace/deletionstate/deletionstate_test.go

@@ -1,11 +1,10 @@
-package settingsstate
+package deletionstate
 
 import (
-	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacestorage/mock_spacestorage"
-	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
 	"sort"
 	"testing"
 )
@@ -19,7 +18,8 @@ type fixture struct {
 func newFixture(t *testing.T) *fixture {
 	ctrl := gomock.NewController(t)
 	spaceStorage := mock_spacestorage.NewMockSpaceStorage(ctrl)
-	delState := NewObjectDeletionState(logger.NewNamed("test"), spaceStorage).(*objectDeletionState)
+	delState := New().(*objectDeletionState)
+	delState.storage = spaceStorage
 	return &fixture{
 		ctrl:         ctrl,
 		delState:     delState,

commonspace/deletionstate/mock_deletionstate/mock_deletionstate.go

@@ -0,0 +1,144 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/anyproto/any-sync/commonspace/deletionstate (interfaces: ObjectDeletionState)
+
+// Package mock_deletionstate is a generated GoMock package.
+package mock_deletionstate
+
+import (
+	reflect "reflect"
+
+	app "github.com/anyproto/any-sync/app"
+	deletionstate "github.com/anyproto/any-sync/commonspace/deletionstate"
+	gomock "go.uber.org/mock/gomock"
+)
+
+// MockObjectDeletionState is a mock of ObjectDeletionState interface.
+type MockObjectDeletionState struct {
+	ctrl     *gomock.Controller
+	recorder *MockObjectDeletionStateMockRecorder
+}
+
+// MockObjectDeletionStateMockRecorder is the mock recorder for MockObjectDeletionState.
+type MockObjectDeletionStateMockRecorder struct {
+	mock *MockObjectDeletionState
+}
+
+// NewMockObjectDeletionState creates a new mock instance.
+func NewMockObjectDeletionState(ctrl *gomock.Controller) *MockObjectDeletionState {
+	mock := &MockObjectDeletionState{ctrl: ctrl}
+	mock.recorder = &MockObjectDeletionStateMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockObjectDeletionState) EXPECT() *MockObjectDeletionStateMockRecorder {
+	return m.recorder
+}
+
+// Add mocks base method.
+func (m *MockObjectDeletionState) Add(arg0 map[string]struct{}) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Add", arg0)
+}
+
+// Add indicates an expected call of Add.
+func (mr *MockObjectDeletionStateMockRecorder) Add(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Add", reflect.TypeOf((*MockObjectDeletionState)(nil).Add), arg0)
+}
+
+// AddObserver mocks base method.
+func (m *MockObjectDeletionState) AddObserver(arg0 deletionstate.StateUpdateObserver) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "AddObserver", arg0)
+}
+
+// AddObserver indicates an expected call of AddObserver.
+func (mr *MockObjectDeletionStateMockRecorder) AddObserver(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddObserver", reflect.TypeOf((*MockObjectDeletionState)(nil).AddObserver), arg0)
+}
+
+// Delete mocks base method.
+func (m *MockObjectDeletionState) Delete(arg0 string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete.
+func (mr *MockObjectDeletionStateMockRecorder) Delete(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockObjectDeletionState)(nil).Delete), arg0)
+}
+
+// Exists mocks base method.
+func (m *MockObjectDeletionState) Exists(arg0 string) bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Exists", arg0)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// Exists indicates an expected call of Exists.
+func (mr *MockObjectDeletionStateMockRecorder) Exists(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exists", reflect.TypeOf((*MockObjectDeletionState)(nil).Exists), arg0)
+}
+
+// Filter mocks base method.
+func (m *MockObjectDeletionState) Filter(arg0 []string) []string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Filter", arg0)
+	ret0, _ := ret[0].([]string)
+	return ret0
+}
+
+// Filter indicates an expected call of Filter.
+func (mr *MockObjectDeletionStateMockRecorder) Filter(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Filter", reflect.TypeOf((*MockObjectDeletionState)(nil).Filter), arg0)
+}
+
+// GetQueued mocks base method.
+func (m *MockObjectDeletionState) GetQueued() []string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetQueued")
+	ret0, _ := ret[0].([]string)
+	return ret0
+}
+
+// GetQueued indicates an expected call of GetQueued.
+func (mr *MockObjectDeletionStateMockRecorder) GetQueued() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetQueued", reflect.TypeOf((*MockObjectDeletionState)(nil).GetQueued))
+}
+
+// Init mocks base method.
+func (m *MockObjectDeletionState) Init(arg0 *app.App) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Init", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Init indicates an expected call of Init.
+func (mr *MockObjectDeletionStateMockRecorder) Init(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockObjectDeletionState)(nil).Init), arg0)
+}
+
+// Name mocks base method.
+func (m *MockObjectDeletionState) Name() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Name")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Name indicates an expected call of Name.
+func (mr *MockObjectDeletionStateMockRecorder) Name() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Name", reflect.TypeOf((*MockObjectDeletionState)(nil).Name))
+}

commonspace/headsync/diffsyncer.go

@@ -3,49 +3,45 @@ package headsync
 import (
 	"context"
 	"fmt"
+	"time"
+
 	"github.com/anyproto/any-sync/app/ldiff"
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/credentialprovider"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager"
 	"github.com/anyproto/any-sync/commonspace/peermanager"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/net/peer"
 	"github.com/anyproto/any-sync/net/rpc/rpcerr"
+	"github.com/anyproto/any-sync/util/slice"
 	"go.uber.org/zap"
-	"time"
 )
 
 type DiffSyncer interface {
 	Sync(ctx context.Context) error
 	RemoveObjects(ids []string)
 	UpdateHeads(id string, heads []string)
-	Init(deletionState settingsstate.ObjectDeletionState)
+	Init()
 	Close() error
 }
 
-func newDiffSyncer(
-	spaceId string,
-	diff ldiff.Diff,
-	peerManager peermanager.PeerManager,
-	cache treemanager.TreeManager,
-	storage spacestorage.SpaceStorage,
-	clientFactory spacesyncproto.ClientFactory,
-	syncStatus syncstatus.StatusUpdater,
-	credentialProvider credentialprovider.CredentialProvider,
-	log logger.CtxLogger) DiffSyncer {
+func newDiffSyncer(hs *headSync) DiffSyncer {
 	return &diffSyncer{
-		diff:               diff,
-		spaceId:            spaceId,
-		treeManager:        cache,
-		storage:            storage,
-		peerManager:        peerManager,
-		clientFactory:      clientFactory,
-		credentialProvider: credentialProvider,
+		diff:               hs.diff,
+		spaceId:            hs.spaceId,
+		treeManager:        hs.treeManager,
+		storage:            hs.storage,
+		peerManager:        hs.peerManager,
+		clientFactory:      spacesyncproto.ClientFactoryFunc(spacesyncproto.NewDRPCSpaceSyncClient),
+		credentialProvider: hs.credentialProvider,
 		log:                log,
-		syncStatus:         syncStatus,
+		syncStatus:         hs.syncStatus,
+		deletionState:      hs.deletionState,
+		syncAcl:            hs.syncAcl,
 	}
 }
 
@@ -57,14 +53,14 @@ type diffSyncer struct {
 	storage            spacestorage.SpaceStorage
 	clientFactory      spacesyncproto.ClientFactory
 	log                logger.CtxLogger
-	deletionState      settingsstate.ObjectDeletionState
+	deletionState      deletionstate.ObjectDeletionState
 	credentialProvider credentialprovider.CredentialProvider
 	syncStatus         syncstatus.StatusUpdater
 	treeSyncer         treemanager.TreeSyncer
+	syncAcl            syncacl.SyncAcl
 }
 
-func (d *diffSyncer) Init(deletionState settingsstate.ObjectDeletionState) {
-	d.deletionState = deletionState
+func (d *diffSyncer) Init() {
 	d.deletionState.AddObserver(d.RemoveObjects)
 	d.treeSyncer = d.treeManager.NewTreeSyncer(d.spaceId, d.treeManager)
 }
@@ -115,10 +111,17 @@ func (d *diffSyncer) Sync(ctx context.Context) error {
 
 func (d *diffSyncer) syncWithPeer(ctx context.Context, p peer.Peer) (err error) {
 	ctx = logger.CtxWithFields(ctx, zap.String("peerId", p.Id()))
+	conn, err := p.AcquireDrpcConn(ctx)
+	if err != nil {
+		return
+	}
+	defer p.ReleaseDrpcConn(conn)
+
 	var (
-		cl           = d.clientFactory.Client(p)
+		cl           = d.clientFactory.Client(conn)
 		rdiff        = NewRemoteDiff(d.spaceId, cl)
 		stateCounter = d.syncStatus.StateCounter()
+		syncAclId    = d.syncAcl.Id()
 	)
 
 	newIds, changedIds, removedIds, err := d.diff.Diff(ctx, rdiff)
@@ -141,17 +144,29 @@ func (d *diffSyncer) syncWithPeer(ctx context.Context, p peer.Peer) (err error)
 	// not syncing ids which were removed through settings document
 	missingIds := d.deletionState.Filter(newIds)
 	existingIds := append(d.deletionState.Filter(removedIds), d.deletionState.Filter(changedIds)...)
-
 	d.syncStatus.RemoveAllExcept(p.Id(), existingIds, stateCounter)
 
+	prevExistingLen := len(existingIds)
+	existingIds = slice.DiscardFromSlice(existingIds, func(s string) bool {
+		return s == syncAclId
+	})
+	// if we removed acl head from the list
+	if len(existingIds) < prevExistingLen {
+		if syncErr := d.syncAcl.SyncWithPeer(ctx, p.Id()); syncErr != nil {
+			log.Warn("failed to send acl sync message to peer", zap.String("aclId", syncAclId))
+		}
+	}
+
+	// treeSyncer should not get acl id, that's why we filter existing ids before
 	err = d.treeSyncer.SyncAll(ctx, p.Id(), existingIds, missingIds)
 	if err != nil {
 		return err
 	}
-	d.log.Info("sync done:", zap.Int("newIds", len(newIds)),
+	d.log.Info("sync done:",
+		zap.Int("newIds", len(newIds)),
 		zap.Int("changedIds", len(changedIds)),
 		zap.Int("removedIds", len(removedIds)),
-		zap.Int("already deleted ids", totalLen-len(existingIds)-len(missingIds)),
+		zap.Int("already deleted ids", totalLen-prevExistingLen-len(missingIds)),
 		zap.String("peerId", p.Id()),
 	)
 	return

commonspace/headsync/diffsyncer_test.go

@@ -4,28 +4,19 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"github.com/anyproto/any-sync/app/ldiff"
-	"github.com/anyproto/any-sync/app/ldiff/mock_ldiff"
-	"github.com/anyproto/any-sync/app/logger"
-	"github.com/anyproto/any-sync/commonspace/credentialprovider/mock_credentialprovider"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
-	"github.com/anyproto/any-sync/commonspace/object/acl/liststorage/mock_liststorage"
-	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
-	mock_treestorage "github.com/anyproto/any-sync/commonspace/object/tree/treestorage/mock_treestorage"
-	"github.com/anyproto/any-sync/commonspace/object/treemanager/mock_treemanager"
-	"github.com/anyproto/any-sync/commonspace/peermanager/mock_peermanager"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate/mock_settingsstate"
-	"github.com/anyproto/any-sync/commonspace/spacestorage/mock_spacestorage"
-	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	"github.com/anyproto/any-sync/commonspace/spacesyncproto/mock_spacesyncproto"
-	"github.com/anyproto/any-sync/commonspace/syncstatus"
-	"github.com/anyproto/any-sync/net/peer"
-	"github.com/golang/mock/gomock"
-	"github.com/libp2p/go-libp2p/core/sec"
-	"github.com/stretchr/testify/require"
-	"storj.io/drpc"
 	"testing"
 	"time"
+
+	"github.com/anyproto/any-sync/app/ldiff"
+	"github.com/anyproto/any-sync/commonspace/object/acl/liststorage/mock_liststorage"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage/mock_treestorage"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/anyproto/any-sync/net/peer"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+	"storj.io/drpc"
 )
 
 type pushSpaceRequestMatcher struct {
@@ -36,60 +27,6 @@ type pushSpaceRequestMatcher struct {
 	spaceHeader *spacesyncproto.RawSpaceHeaderWithId
 }
 
-func (p pushSpaceRequestMatcher) Matches(x interface{}) bool {
-	res, ok := x.(*spacesyncproto.SpacePushRequest)
-	if !ok {
-		return false
-	}
-
-	return res.Payload.AclPayloadId == p.aclRootId && res.Payload.SpaceHeader == p.spaceHeader && res.Payload.SpaceSettingsPayloadId == p.settingsId && bytes.Equal(p.credential, res.Credential)
-}
-
-func (p pushSpaceRequestMatcher) String() string {
-	return ""
-}
-
-type mockPeer struct{}
-
-func (m mockPeer) Addr() string {
-	return ""
-}
-
-func (m mockPeer) TryClose(objectTTL time.Duration) (res bool, err error) {
-	return true, m.Close()
-}
-
-func (m mockPeer) Id() string {
-	return "mockId"
-}
-
-func (m mockPeer) LastUsage() time.Time {
-	return time.Time{}
-}
-
-func (m mockPeer) Secure() sec.SecureConn {
-	return nil
-}
-
-func (m mockPeer) UpdateLastUsage() {
-}
-
-func (m mockPeer) Close() error {
-	return nil
-}
-
-func (m mockPeer) Closed() <-chan struct{} {
-	return make(chan struct{})
-}
-
-func (m mockPeer) Invoke(ctx context.Context, rpc string, enc drpc.Encoding, in, out drpc.Message) error {
-	return nil
-}
-
-func (m mockPeer) NewStream(ctx context.Context, rpc string, enc drpc.Encoding) (drpc.Stream, error) {
-	return nil, nil
-}
-
 func newPushSpaceRequestMatcher(
 	spaceId string,
 	aclRootId string,
@@ -105,81 +42,159 @@ func newPushSpaceRequestMatcher(
 	}
 }
 
-func TestDiffSyncer_Sync(t *testing.T) {
-	// setup
-	ctx := context.Background()
-	ctrl := gomock.NewController(t)
-	defer ctrl.Finish()
+func (p pushSpaceRequestMatcher) Matches(x interface{}) bool {
+	res, ok := x.(*spacesyncproto.SpacePushRequest)
+	if !ok {
+		return false
+	}
 
-	diffMock := mock_ldiff.NewMockDiff(ctrl)
-	peerManagerMock := mock_peermanager.NewMockPeerManager(ctrl)
-	cacheMock := mock_treemanager.NewMockTreeManager(ctrl)
-	stMock := mock_spacestorage.NewMockSpaceStorage(ctrl)
-	clientMock := mock_spacesyncproto.NewMockDRPCSpaceSyncClient(ctrl)
-	factory := spacesyncproto.ClientFactoryFunc(func(cc drpc.Conn) spacesyncproto.DRPCSpaceSyncClient {
-		return clientMock
+	return res.Payload.AclPayloadId == p.aclRootId && res.Payload.SpaceHeader == p.spaceHeader && res.Payload.SpaceSettingsPayloadId == p.settingsId && bytes.Equal(p.credential, res.Credential)
+}
+
+func (p pushSpaceRequestMatcher) String() string {
+	return ""
+}
+
+type mockPeer struct {
+}
+
+func (m mockPeer) Id() string {
+	return "peerId"
+}
+
+func (m mockPeer) Context() context.Context {
+	return context.Background()
+}
+
+func (m mockPeer) AcquireDrpcConn(ctx context.Context) (drpc.Conn, error) {
+	return nil, nil
+}
+
+func (m mockPeer) ReleaseDrpcConn(conn drpc.Conn) {
+	return
+}
+
+func (m mockPeer) DoDrpc(ctx context.Context, do func(conn drpc.Conn) error) error {
+	return nil
+}
+
+func (m mockPeer) IsClosed() bool {
+	return false
+}
+
+func (m mockPeer) TryClose(objectTTL time.Duration) (res bool, err error) {
+	return false, err
+}
+
+func (m mockPeer) Close() (err error) {
+	return nil
+}
+
+func (fx *headSyncFixture) initDiffSyncer(t *testing.T) {
+	fx.init(t)
+	fx.diffSyncer = newDiffSyncer(fx.headSync).(*diffSyncer)
+	fx.diffSyncer.clientFactory = spacesyncproto.ClientFactoryFunc(func(cc drpc.Conn) spacesyncproto.DRPCSpaceSyncClient {
+		return fx.clientMock
 	})
-	treeSyncerMock := mock_treemanager.NewMockTreeSyncer(ctrl)
-	credentialProvider := mock_credentialprovider.NewMockCredentialProvider(ctrl)
-	delState := mock_settingsstate.NewMockObjectDeletionState(ctrl)
-	spaceId := "spaceId"
-	aclRootId := "aclRootId"
-	l := logger.NewNamed(spaceId)
-	diffSyncer := newDiffSyncer(spaceId, diffMock, peerManagerMock, cacheMock, stMock, factory, syncstatus.NewNoOpSyncStatus(), credentialProvider, l)
-	delState.EXPECT().AddObserver(gomock.Any())
-	cacheMock.EXPECT().NewTreeSyncer(spaceId, gomock.Any()).Return(treeSyncerMock)
-	diffSyncer.Init(delState)
+	fx.deletionStateMock.EXPECT().AddObserver(gomock.Any())
+	fx.treeManagerMock.EXPECT().NewTreeSyncer(fx.spaceState.SpaceId, fx.treeManagerMock).Return(fx.treeSyncerMock)
+	fx.diffSyncer.Init()
+}
+
+func TestDiffSyncer(t *testing.T) {
+	ctx := context.Background()
 
 	t.Run("diff syncer sync", func(t *testing.T) {
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
 		mPeer := mockPeer{}
-		peerManagerMock.EXPECT().
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return([]peer.Peer{mPeer}, nil)
-		diffMock.EXPECT().
-			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(spaceId, clientMock))).
+		fx.diffMock.EXPECT().
+			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock))).
 			Return([]string{"new"}, []string{"changed"}, nil, nil)
-		delState.EXPECT().Filter([]string{"new"}).Return([]string{"new"}).Times(1)
-		delState.EXPECT().Filter([]string{"changed"}).Return([]string{"changed"}).Times(1)
-		delState.EXPECT().Filter(nil).Return(nil).Times(1)
-		treeSyncerMock.EXPECT().SyncAll(gomock.Any(), mPeer.Id(), []string{"changed"}, []string{"new"}).Return(nil)
-		require.NoError(t, diffSyncer.Sync(ctx))
+		fx.deletionStateMock.EXPECT().Filter([]string{"new"}).Return([]string{"new"}).Times(1)
+		fx.deletionStateMock.EXPECT().Filter([]string{"changed"}).Return([]string{"changed"}).Times(1)
+		fx.deletionStateMock.EXPECT().Filter(nil).Return(nil).Times(1)
+		fx.treeSyncerMock.EXPECT().SyncAll(gomock.Any(), mPeer.Id(), []string{"changed"}, []string{"new"}).Return(nil)
+		require.NoError(t, fx.diffSyncer.Sync(ctx))
+	})
+
+	t.Run("diff syncer sync, acl changed", func(t *testing.T) {
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
+		mPeer := mockPeer{}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.peerManagerMock.EXPECT().
+			GetResponsiblePeers(gomock.Any()).
+			Return([]peer.Peer{mPeer}, nil)
+		fx.diffMock.EXPECT().
+			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock))).
+			Return([]string{"new"}, []string{"changed"}, nil, nil)
+		fx.deletionStateMock.EXPECT().Filter([]string{"new"}).Return([]string{"new"}).Times(1)
+		fx.deletionStateMock.EXPECT().Filter([]string{"changed"}).Return([]string{"changed", "aclId"}).Times(1)
+		fx.deletionStateMock.EXPECT().Filter(nil).Return(nil).Times(1)
+		fx.treeSyncerMock.EXPECT().SyncAll(gomock.Any(), mPeer.Id(), []string{"changed"}, []string{"new"}).Return(nil)
+		fx.aclMock.EXPECT().SyncWithPeer(gomock.Any(), mPeer.Id()).Return(nil)
+		require.NoError(t, fx.diffSyncer.Sync(ctx))
 	})
 
 	t.Run("diff syncer sync conf error", func(t *testing.T) {
-		peerManagerMock.EXPECT().
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
+		ctx := context.Background()
+		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return(nil, fmt.Errorf("some error"))
 
-		require.Error(t, diffSyncer.Sync(ctx))
+		require.Error(t, fx.diffSyncer.Sync(ctx))
 	})
 
 	t.Run("deletion state remove objects", func(t *testing.T) {
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
 		deletedId := "id"
-		delState.EXPECT().Exists(deletedId).Return(true)
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.deletionStateMock.EXPECT().Exists(deletedId).Return(true)
 
 		// this should not result in any mock being called
-		diffSyncer.UpdateHeads(deletedId, []string{"someHead"})
+		fx.diffSyncer.UpdateHeads(deletedId, []string{"someHead"})
 	})
 
 	t.Run("update heads updates diff", func(t *testing.T) {
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
 		newId := "newId"
 		newHeads := []string{"h1", "h2"}
 		hash := "hash"
-		diffMock.EXPECT().Set(ldiff.Element{
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.diffMock.EXPECT().Set(ldiff.Element{
 			Id:   newId,
 			Head: concatStrings(newHeads),
 		})
-		diffMock.EXPECT().Hash().Return(hash)
-		delState.EXPECT().Exists(newId).Return(false)
-		stMock.EXPECT().WriteSpaceHash(hash)
-		diffSyncer.UpdateHeads(newId, newHeads)
+		fx.diffMock.EXPECT().Hash().Return(hash)
+		fx.deletionStateMock.EXPECT().Exists(newId).Return(false)
+		fx.storageMock.EXPECT().WriteSpaceHash(hash)
+		fx.diffSyncer.UpdateHeads(newId, newHeads)
 	})
 
 	t.Run("diff syncer sync space missing", func(t *testing.T) {
-		aclStorageMock := mock_liststorage.NewMockListStorage(ctrl)
-		settingsStorage := mock_treestorage.NewMockTreeStorage(ctrl)
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		aclStorageMock := mock_liststorage.NewMockListStorage(fx.ctrl)
+		settingsStorage := mock_treestorage.NewMockTreeStorage(fx.ctrl)
 		settingsId := "settingsId"
-		aclRoot := &aclrecordproto.RawAclRecordWithId{
+		aclRootId := "aclRootId"
+		aclRoot := &consensusproto.RawRecordWithId{
 			Id: aclRootId,
 		}
 		settingsRoot := &treechangeproto.RawTreeChangeWithId{
@@ -189,55 +204,63 @@ func TestDiffSyncer_Sync(t *testing.T) {
 		spaceSettingsId := "spaceSettingsId"
 		credential := []byte("credential")
 
-		peerManagerMock.EXPECT().
+		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return([]peer.Peer{mockPeer{}}, nil)
-		diffMock.EXPECT().
-			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(spaceId, clientMock))).
+		fx.diffMock.EXPECT().
+			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock))).
 			Return(nil, nil, nil, spacesyncproto.ErrSpaceMissing)
 
-		stMock.EXPECT().AclStorage().Return(aclStorageMock, nil)
-		stMock.EXPECT().SpaceHeader().Return(spaceHeader, nil)
-		stMock.EXPECT().SpaceSettingsId().Return(spaceSettingsId)
-		stMock.EXPECT().TreeStorage(spaceSettingsId).Return(settingsStorage, nil)
+		fx.storageMock.EXPECT().AclStorage().Return(aclStorageMock, nil)
+		fx.storageMock.EXPECT().SpaceHeader().Return(spaceHeader, nil)
+		fx.storageMock.EXPECT().SpaceSettingsId().Return(spaceSettingsId)
+		fx.storageMock.EXPECT().TreeStorage(spaceSettingsId).Return(settingsStorage, nil)
 
 		settingsStorage.EXPECT().Root().Return(settingsRoot, nil)
 		aclStorageMock.EXPECT().
 			Root().
 			Return(aclRoot, nil)
-		credentialProvider.EXPECT().
+		fx.credentialProviderMock.EXPECT().
 			GetCredential(gomock.Any(), spaceHeader).
 			Return(credential, nil)
-		clientMock.EXPECT().
-			SpacePush(gomock.Any(), newPushSpaceRequestMatcher(spaceId, aclRootId, settingsId, credential, spaceHeader)).
+		fx.clientMock.EXPECT().
+			SpacePush(gomock.Any(), newPushSpaceRequestMatcher(fx.spaceState.SpaceId, aclRootId, settingsId, credential, spaceHeader)).
 			Return(nil, nil)
-		peerManagerMock.EXPECT().SendPeer(gomock.Any(), "mockId", gomock.Any())
+		fx.peerManagerMock.EXPECT().SendPeer(gomock.Any(), "peerId", gomock.Any())
 
-		require.NoError(t, diffSyncer.Sync(ctx))
+		require.NoError(t, fx.diffSyncer.Sync(ctx))
 	})
 
 	t.Run("diff syncer sync unexpected", func(t *testing.T) {
-		peerManagerMock.EXPECT().
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return([]peer.Peer{mockPeer{}}, nil)
-		diffMock.EXPECT().
-			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(spaceId, clientMock))).
+		fx.diffMock.EXPECT().
+			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock))).
 			Return(nil, nil, nil, spacesyncproto.ErrUnexpected)
 
-		require.NoError(t, diffSyncer.Sync(ctx))
+		require.NoError(t, fx.diffSyncer.Sync(ctx))
 	})
 
 	t.Run("diff syncer sync space is deleted error", func(t *testing.T) {
+		fx := newHeadSyncFixture(t)
+		fx.initDiffSyncer(t)
+		defer fx.stop()
 		mPeer := mockPeer{}
-		peerManagerMock.EXPECT().
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return([]peer.Peer{mPeer}, nil)
-		diffMock.EXPECT().
-			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(spaceId, clientMock))).
+		fx.diffMock.EXPECT().
+			Diff(gomock.Any(), gomock.Eq(NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock))).
 			Return(nil, nil, nil, spacesyncproto.ErrSpaceIsDeleted)
-		stMock.EXPECT().SpaceSettingsId().Return("settingsId")
-		treeSyncerMock.EXPECT().SyncAll(gomock.Any(), mPeer.Id(), []string{"settingsId"}, nil).Return(nil)
+		fx.storageMock.EXPECT().SpaceSettingsId().Return("settingsId")
+		fx.treeSyncerMock.EXPECT().SyncAll(gomock.Any(), mPeer.Id(), []string{"settingsId"}, nil).Return(nil)
 
-		require.NoError(t, diffSyncer.Sync(ctx))
+		require.NoError(t, fx.diffSyncer.Sync(ctx))
 	})
 }

commonspace/headsync/headsync.go

@@ -3,123 +3,150 @@ package headsync
 
 import (
 	"context"
+	"sync/atomic"
+	"time"
+
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/app/ldiff"
 	"github.com/anyproto/any-sync/app/logger"
+	config2 "github.com/anyproto/any-sync/commonspace/config"
 	"github.com/anyproto/any-sync/commonspace/credentialprovider"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager"
 	"github.com/anyproto/any-sync/commonspace/peermanager"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/net/peer"
 	"github.com/anyproto/any-sync/nodeconf"
 	"github.com/anyproto/any-sync/util/periodicsync"
+	"github.com/anyproto/any-sync/util/slice"
 	"go.uber.org/zap"
 	"golang.org/x/exp/slices"
-	"strings"
-	"sync/atomic"
-	"time"
 )
 
+var log = logger.NewNamed(CName)
+
+const CName = "common.commonspace.headsync"
+
 type TreeHeads struct {
 	Id    string
 	Heads []string
 }
 
 type HeadSync interface {
-	Init(objectIds []string, deletionState settingsstate.ObjectDeletionState)
-
+	app.ComponentRunnable
+	ExternalIds() []string
+	DebugAllHeads() (res []TreeHeads)
+	AllIds() []string
 	UpdateHeads(id string, heads []string)
 	HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error)
 	RemoveObjects(ids []string)
-	AllIds() []string
-	DebugAllHeads() (res []TreeHeads)
-
-	Close() (err error)
 }
 
 type headSync struct {
 	spaceId        string
-	periodicSync   periodicsync.PeriodicSync
-	storage        spacestorage.SpaceStorage
-	diff           ldiff.Diff
-	log            logger.CtxLogger
-	syncer         DiffSyncer
-	configuration  nodeconf.NodeConf
 	spaceIsDeleted *atomic.Bool
+	syncPeriod     int
 
-	syncPeriod int
+	periodicSync       periodicsync.PeriodicSync
+	storage            spacestorage.SpaceStorage
+	diff               ldiff.Diff
+	log                logger.CtxLogger
+	syncer             DiffSyncer
+	configuration      nodeconf.NodeConf
+	peerManager        peermanager.PeerManager
+	treeManager        treemanager.TreeManager
+	credentialProvider credentialprovider.CredentialProvider
+	syncStatus         syncstatus.StatusService
+	deletionState      deletionstate.ObjectDeletionState
+	syncAcl            syncacl.SyncAcl
 }
 
-func NewHeadSync(
-	spaceId string,
-	spaceIsDeleted *atomic.Bool,
-	syncPeriod int,
-	configuration nodeconf.NodeConf,
-	storage spacestorage.SpaceStorage,
-	peerManager peermanager.PeerManager,
-	cache treemanager.TreeManager,
-	syncStatus syncstatus.StatusUpdater,
-	credentialProvider credentialprovider.CredentialProvider,
-	log logger.CtxLogger) HeadSync {
+func New() HeadSync {
+	return &headSync{}
+}
 
-	diff := ldiff.New(16, 16)
-	l := log.With(zap.String("spaceId", spaceId))
-	factory := spacesyncproto.ClientFactoryFunc(spacesyncproto.NewDRPCSpaceSyncClient)
-	syncer := newDiffSyncer(spaceId, diff, peerManager, cache, storage, factory, syncStatus, credentialProvider, l)
+var createDiffSyncer = newDiffSyncer
+
+func (h *headSync) Init(a *app.App) (err error) {
+	shared := a.MustComponent(spacestate.CName).(*spacestate.SpaceState)
+	cfg := a.MustComponent("config").(config2.ConfigGetter)
+	h.syncAcl = a.MustComponent(syncacl.CName).(syncacl.SyncAcl)
+	h.spaceId = shared.SpaceId
+	h.spaceIsDeleted = shared.SpaceIsDeleted
+	h.syncPeriod = cfg.GetSpace().SyncPeriod
+	h.configuration = a.MustComponent(nodeconf.CName).(nodeconf.NodeConf)
+	h.log = log.With(zap.String("spaceId", h.spaceId))
+	h.storage = a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	h.diff = ldiff.New(16, 16)
+	h.peerManager = a.MustComponent(peermanager.CName).(peermanager.PeerManager)
+	h.credentialProvider = a.MustComponent(credentialprovider.CName).(credentialprovider.CredentialProvider)
+	h.syncStatus = a.MustComponent(syncstatus.CName).(syncstatus.StatusService)
+	h.treeManager = a.MustComponent(treemanager.CName).(treemanager.TreeManager)
+	h.deletionState = a.MustComponent(deletionstate.CName).(deletionstate.ObjectDeletionState)
+	h.syncer = createDiffSyncer(h)
 	sync := func(ctx context.Context) (err error) {
 		// for clients cancelling the sync process
-		if spaceIsDeleted.Load() && !configuration.IsResponsible(spaceId) {
+		if h.spaceIsDeleted.Load() && !h.configuration.IsResponsible(h.spaceId) {
 			return spacesyncproto.ErrSpaceIsDeleted
 		}
-		return syncer.Sync(ctx)
-	}
-	periodicSync := periodicsync.NewPeriodicSync(syncPeriod, time.Minute, sync, l)
-
-	return &headSync{
-		spaceId:        spaceId,
-		storage:        storage,
-		syncer:         syncer,
-		periodicSync:   periodicSync,
-		diff:           diff,
-		log:            log,
-		syncPeriod:     syncPeriod,
-		configuration:  configuration,
-		spaceIsDeleted: spaceIsDeleted,
+		return h.syncer.Sync(ctx)
 	}
+	h.periodicSync = periodicsync.NewPeriodicSync(h.syncPeriod, time.Minute, sync, h.log)
+	h.syncAcl.SetHeadUpdater(h)
+	// TODO: move to run?
+	h.syncer.Init()
+	return nil
 }
 
-func (d *headSync) Init(objectIds []string, deletionState settingsstate.ObjectDeletionState) {
-	d.fillDiff(objectIds)
-	d.syncer.Init(deletionState)
-	d.periodicSync.Run()
+func (h *headSync) Name() (name string) {
+	return CName
 }
 
-func (d *headSync) HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error) {
-	if d.spaceIsDeleted.Load() {
+func (h *headSync) Run(ctx context.Context) (err error) {
+	initialIds, err := h.storage.StoredIds()
+	if err != nil {
+		return
+	}
+	h.fillDiff(initialIds)
+	h.periodicSync.Run()
+	return
+}
+
+func (h *headSync) HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error) {
+	if h.spaceIsDeleted.Load() {
 		peerId, err := peer.CtxPeerId(ctx)
 		if err != nil {
 			return nil, err
 		}
 		// stop receiving all request for sync from clients
-		if !slices.Contains(d.configuration.NodeIds(d.spaceId), peerId) {
+		if !slices.Contains(h.configuration.NodeIds(h.spaceId), peerId) {
 			return nil, spacesyncproto.ErrSpaceIsDeleted
 		}
 	}
-	return HandleRangeRequest(ctx, d.diff, req)
+	return HandleRangeRequest(ctx, h.diff, req)
 }
 
-func (d *headSync) UpdateHeads(id string, heads []string) {
-	d.syncer.UpdateHeads(id, heads)
+func (h *headSync) UpdateHeads(id string, heads []string) {
+	h.syncer.UpdateHeads(id, heads)
 }
 
-func (d *headSync) AllIds() []string {
-	return d.diff.Ids()
+func (h *headSync) AllIds() []string {
+	return h.diff.Ids()
 }
 
-func (d *headSync) DebugAllHeads() (res []TreeHeads) {
-	els := d.diff.Elements()
+func (h *headSync) ExternalIds() []string {
+	settingsId := h.storage.SpaceSettingsId()
+	return slice.DiscardFromSlice(h.AllIds(), func(id string) bool {
+		return id == settingsId
+	})
+}
+
+func (h *headSync) DebugAllHeads() (res []TreeHeads) {
+	els := h.diff.Elements()
 	for _, el := range els {
 		idHead := TreeHeads{
 			Id:    el.Id,
@@ -130,19 +157,19 @@ func (d *headSync) DebugAllHeads() (res []TreeHeads) {
 	return
 }
 
-func (d *headSync) RemoveObjects(ids []string) {
-	d.syncer.RemoveObjects(ids)
+func (h *headSync) RemoveObjects(ids []string) {
+	h.syncer.RemoveObjects(ids)
 }
 
-func (d *headSync) Close() (err error) {
-	d.periodicSync.Close()
-	return d.syncer.Close()
+func (h *headSync) Close(ctx context.Context) (err error) {
+	h.periodicSync.Close()
+	return h.syncer.Close()
 }
 
-func (d *headSync) fillDiff(objectIds []string) {
+func (h *headSync) fillDiff(objectIds []string) {
 	var els = make([]ldiff.Element, 0, len(objectIds))
 	for _, id := range objectIds {
-		st, err := d.storage.TreeStorage(id)
+		st, err := h.storage.TreeStorage(id)
 		if err != nil {
 			continue
 		}
@@ -155,32 +182,12 @@ func (d *headSync) fillDiff(objectIds []string) {
 			Head: concatStrings(heads),
 		})
 	}
-	d.diff.Set(els...)
-	if err := d.storage.WriteSpaceHash(d.diff.Hash()); err != nil {
-		d.log.Error("can't write space hash", zap.Error(err))
+	els = append(els, ldiff.Element{
+		Id:   h.syncAcl.Id(),
+		Head: h.syncAcl.Head().Id,
+	})
+	h.diff.Set(els...)
+	if err := h.storage.WriteSpaceHash(h.diff.Hash()); err != nil {
+		h.log.Error("can't write space hash", zap.Error(err))
 	}
 }
-
-func concatStrings(strs []string) string {
-	var (
-		b        strings.Builder
-		totalLen int
-	)
-	for _, s := range strs {
-		totalLen += len(s)
-	}
-
-	b.Grow(totalLen)
-	for _, s := range strs {
-		b.WriteString(s)
-	}
-	return b.String()
-}
-
-func splitString(str string) (res []string) {
-	const cidLen = 59
-	for i := 0; i < len(str); i += cidLen {
-		res = append(res, str[i:i+cidLen])
-	}
-	return
-}

commonspace/headsync/headsync_test.go

@@ -1,71 +1,190 @@
 package headsync
 
 import (
+	"context"
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/app/ldiff"
 	"github.com/anyproto/any-sync/app/ldiff/mock_ldiff"
-	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/config"
+	"github.com/anyproto/any-sync/commonspace/credentialprovider"
+	"github.com/anyproto/any-sync/commonspace/credentialprovider/mock_credentialprovider"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
+	"github.com/anyproto/any-sync/commonspace/deletionstate/mock_deletionstate"
 	"github.com/anyproto/any-sync/commonspace/headsync/mock_headsync"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl/mock_syncacl"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage/mock_treestorage"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate/mock_settingsstate"
+	"github.com/anyproto/any-sync/commonspace/object/treemanager"
+	"github.com/anyproto/any-sync/commonspace/object/treemanager/mock_treemanager"
+	"github.com/anyproto/any-sync/commonspace/peermanager"
+	"github.com/anyproto/any-sync/commonspace/peermanager/mock_peermanager"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
+	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacestorage/mock_spacestorage"
-	"github.com/anyproto/any-sync/util/periodicsync/mock_periodicsync"
-	"github.com/golang/mock/gomock"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto/mock_spacesyncproto"
+	"github.com/anyproto/any-sync/commonspace/syncstatus"
+	"github.com/anyproto/any-sync/nodeconf"
+	"github.com/anyproto/any-sync/nodeconf/mock_nodeconf"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+	"sync/atomic"
 	"testing"
 )
 
-func TestDiffService(t *testing.T) {
-	ctrl := gomock.NewController(t)
-	defer ctrl.Finish()
+type mockConfig struct {
+}
 
-	spaceId := "spaceId"
-	l := logger.NewNamed("sync")
-	pSyncMock := mock_periodicsync.NewMockPeriodicSync(ctrl)
-	storageMock := mock_spacestorage.NewMockSpaceStorage(ctrl)
-	treeStorageMock := mock_treestorage.NewMockTreeStorage(ctrl)
-	diffMock := mock_ldiff.NewMockDiff(ctrl)
-	syncer := mock_headsync.NewMockDiffSyncer(ctrl)
-	delState := mock_settingsstate.NewMockObjectDeletionState(ctrl)
-	syncPeriod := 1
-	initId := "initId"
+func (m mockConfig) Init(a *app.App) (err error) {
+	return nil
+}
 
-	service := &headSync{
-		spaceId:      spaceId,
-		storage:      storageMock,
-		periodicSync: pSyncMock,
-		syncer:       syncer,
-		diff:         diffMock,
-		log:          l,
-		syncPeriod:   syncPeriod,
+func (m mockConfig) Name() (name string) {
+	return "config"
+}
+
+func (m mockConfig) GetSpace() config.Config {
+	return config.Config{}
+}
+
+type headSyncFixture struct {
+	spaceState *spacestate.SpaceState
+	ctrl       *gomock.Controller
+	app        *app.App
+
+	configurationMock      *mock_nodeconf.MockService
+	storageMock            *mock_spacestorage.MockSpaceStorage
+	peerManagerMock        *mock_peermanager.MockPeerManager
+	credentialProviderMock *mock_credentialprovider.MockCredentialProvider
+	syncStatus             syncstatus.StatusService
+	treeManagerMock        *mock_treemanager.MockTreeManager
+	deletionStateMock      *mock_deletionstate.MockObjectDeletionState
+	diffSyncerMock         *mock_headsync.MockDiffSyncer
+	treeSyncerMock         *mock_treemanager.MockTreeSyncer
+	diffMock               *mock_ldiff.MockDiff
+	clientMock             *mock_spacesyncproto.MockDRPCSpaceSyncClient
+	aclMock                *mock_syncacl.MockSyncAcl
+	headSync               *headSync
+	diffSyncer             *diffSyncer
+}
+
+func newHeadSyncFixture(t *testing.T) *headSyncFixture {
+	spaceState := &spacestate.SpaceState{
+		SpaceId:        "spaceId",
+		SpaceIsDeleted: &atomic.Bool{},
 	}
+	ctrl := gomock.NewController(t)
+	configurationMock := mock_nodeconf.NewMockService(ctrl)
+	configurationMock.EXPECT().Name().AnyTimes().Return(nodeconf.CName)
+	storageMock := mock_spacestorage.NewMockSpaceStorage(ctrl)
+	storageMock.EXPECT().Name().AnyTimes().Return(spacestorage.CName)
+	peerManagerMock := mock_peermanager.NewMockPeerManager(ctrl)
+	peerManagerMock.EXPECT().Name().AnyTimes().Return(peermanager.CName)
+	credentialProviderMock := mock_credentialprovider.NewMockCredentialProvider(ctrl)
+	credentialProviderMock.EXPECT().Name().AnyTimes().Return(credentialprovider.CName)
+	syncStatus := syncstatus.NewNoOpSyncStatus()
+	treeManagerMock := mock_treemanager.NewMockTreeManager(ctrl)
+	treeManagerMock.EXPECT().Name().AnyTimes().Return(treemanager.CName)
+	deletionStateMock := mock_deletionstate.NewMockObjectDeletionState(ctrl)
+	deletionStateMock.EXPECT().Name().AnyTimes().Return(deletionstate.CName)
+	diffSyncerMock := mock_headsync.NewMockDiffSyncer(ctrl)
+	treeSyncerMock := mock_treemanager.NewMockTreeSyncer(ctrl)
+	diffMock := mock_ldiff.NewMockDiff(ctrl)
+	clientMock := mock_spacesyncproto.NewMockDRPCSpaceSyncClient(ctrl)
+	aclMock := mock_syncacl.NewMockSyncAcl(ctrl)
+	aclMock.EXPECT().Name().AnyTimes().Return(syncacl.CName)
+	aclMock.EXPECT().SetHeadUpdater(gomock.Any()).AnyTimes()
+	hs := &headSync{}
+	a := &app.App{}
+	a.Register(spaceState).
+		Register(aclMock).
+		Register(mockConfig{}).
+		Register(configurationMock).
+		Register(storageMock).
+		Register(peerManagerMock).
+		Register(credentialProviderMock).
+		Register(syncStatus).
+		Register(treeManagerMock).
+		Register(deletionStateMock).
+		Register(hs)
+	return &headSyncFixture{
+		spaceState:             spaceState,
+		ctrl:                   ctrl,
+		app:                    a,
+		configurationMock:      configurationMock,
+		storageMock:            storageMock,
+		peerManagerMock:        peerManagerMock,
+		credentialProviderMock: credentialProviderMock,
+		syncStatus:             syncStatus,
+		treeManagerMock:        treeManagerMock,
+		deletionStateMock:      deletionStateMock,
+		headSync:               hs,
+		diffSyncerMock:         diffSyncerMock,
+		treeSyncerMock:         treeSyncerMock,
+		diffMock:               diffMock,
+		clientMock:             clientMock,
+		aclMock:                aclMock,
+	}
+}
 
-	t.Run("init", func(t *testing.T) {
-		storageMock.EXPECT().TreeStorage(initId).Return(treeStorageMock, nil)
-		treeStorageMock.EXPECT().Heads().Return([]string{"h1", "h2"}, nil)
-		syncer.EXPECT().Init(delState)
-		diffMock.EXPECT().Set(ldiff.Element{
-			Id:   initId,
+func (fx *headSyncFixture) init(t *testing.T) {
+	createDiffSyncer = func(hs *headSync) DiffSyncer {
+		return fx.diffSyncerMock
+	}
+	fx.diffSyncerMock.EXPECT().Init()
+	err := fx.headSync.Init(fx.app)
+	require.NoError(t, err)
+	fx.headSync.diff = fx.diffMock
+}
+
+func (fx *headSyncFixture) stop() {
+	fx.ctrl.Finish()
+}
+
+func TestHeadSync(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("run close", func(t *testing.T) {
+		fx := newHeadSyncFixture(t)
+		fx.init(t)
+		defer fx.stop()
+
+		ids := []string{"id1"}
+		treeMock := mock_treestorage.NewMockTreeStorage(fx.ctrl)
+		fx.storageMock.EXPECT().StoredIds().Return(ids, nil)
+		fx.storageMock.EXPECT().TreeStorage(ids[0]).Return(treeMock, nil)
+		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.aclMock.EXPECT().Head().AnyTimes().Return(&list.AclRecord{Id: "headId"})
+		treeMock.EXPECT().Heads().Return([]string{"h1", "h2"}, nil)
+		fx.diffMock.EXPECT().Set(ldiff.Element{
+			Id:   "id1",
 			Head: "h1h2",
 		})
-		hash := "123"
-		diffMock.EXPECT().Hash().Return(hash)
-		storageMock.EXPECT().WriteSpaceHash(hash)
-		pSyncMock.EXPECT().Run()
-		service.Init([]string{initId}, delState)
+		fx.diffMock.EXPECT().Hash().Return("hash")
+		fx.storageMock.EXPECT().WriteSpaceHash("hash").Return(nil)
+		fx.diffSyncerMock.EXPECT().Sync(gomock.Any()).Return(nil)
+		fx.diffSyncerMock.EXPECT().Close().Return(nil)
+		err := fx.headSync.Run(ctx)
+		require.NoError(t, err)
+		err = fx.headSync.Close(ctx)
+		require.NoError(t, err)
 	})
 
 	t.Run("update heads", func(t *testing.T) {
-		syncer.EXPECT().UpdateHeads(initId, []string{"h1", "h2"})
-		service.UpdateHeads(initId, []string{"h1", "h2"})
+		fx := newHeadSyncFixture(t)
+		fx.init(t)
+		defer fx.stop()
+
+		fx.diffSyncerMock.EXPECT().UpdateHeads("id1", []string{"h1"})
+		fx.headSync.UpdateHeads("id1", []string{"h1"})
 	})
 
 	t.Run("remove objects", func(t *testing.T) {
-		syncer.EXPECT().RemoveObjects([]string{"h1", "h2"})
-		service.RemoveObjects([]string{"h1", "h2"})
-	})
+		fx := newHeadSyncFixture(t)
+		fx.init(t)
+		defer fx.stop()
 
-	t.Run("close", func(t *testing.T) {
-		pSyncMock.EXPECT().Close()
-		syncer.EXPECT().Close()
-		service.Close()
+		fx.diffSyncerMock.EXPECT().RemoveObjects([]string{"id1"})
+		fx.headSync.RemoveObjects([]string{"id1"})
 	})
 }

commonspace/headsync/mock_headsync/mock_headsync.go

@@ -8,8 +8,7 @@ import (
 	context "context"
 	reflect "reflect"
 
-	settingsstate "github.com/anyproto/any-sync/commonspace/settings/settingsstate"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockDiffSyncer is a mock of DiffSyncer interface.
@@ -50,15 +49,15 @@ func (mr *MockDiffSyncerMockRecorder) Close() *gomock.Call {
 }
 
 // Init mocks base method.
-func (m *MockDiffSyncer) Init(arg0 settingsstate.ObjectDeletionState) {
+func (m *MockDiffSyncer) Init() {
 	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Init", arg0)
+	m.ctrl.Call(m, "Init")
 }
 
 // Init indicates an expected call of Init.
-func (mr *MockDiffSyncerMockRecorder) Init(arg0 interface{}) *gomock.Call {
+func (mr *MockDiffSyncerMockRecorder) Init() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockDiffSyncer)(nil).Init), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockDiffSyncer)(nil).Init))
 }
 
 // RemoveObjects mocks base method.

commonspace/headsync/util.go

@@ -0,0 +1,27 @@
+package headsync
+
+import "strings"
+
+func concatStrings(strs []string) string {
+	var (
+		b        strings.Builder
+		totalLen int
+	)
+	for _, s := range strs {
+		totalLen += len(s)
+	}
+
+	b.Grow(totalLen)
+	for _, s := range strs {
+		b.WriteString(s)
+	}
+	return b.String()
+}
+
+func splitString(str string) (res []string) {
+	const cidLen = 59
+	for i := 0; i < len(str); i += cidLen {
+		res = append(res, str[i:i+cidLen])
+	}
+	return
+}

commonspace/object/acl/aclrecordproto/protos/aclrecord.proto

@@ -2,26 +2,7 @@ syntax = "proto3";
 package aclrecord;
 option go_package = "commonspace/object/acl/aclrecordproto";
 
-message RawAclRecord {
-    bytes payload = 1;
-    bytes signature = 2;
-    bytes acceptorIdentity = 3;
-    bytes acceptorSignature = 4;
-}
-
-message RawAclRecordWithId {
-    bytes payload = 1;
-    string id = 2;
-}
-
-message AclRecord {
-    string prevId = 1;
-    bytes identity = 2;
-    bytes data = 3;
-    string readKeyId = 4;
-    int64 timestamp = 5;
-}
-
+// AclRoot is a root of access control list
 message AclRoot {
     bytes identity = 1;
     bytes masterKey = 2;
@@ -31,82 +12,95 @@ message AclRoot {
     bytes identitySignature = 6;
 }
 
-message AclContentValue {
-    oneof value {
-        AclUserAdd userAdd = 1;
-        AclUserRemove userRemove = 2;
-        AclUserPermissionChange userPermissionChange = 3;
-        AclUserInvite userInvite = 4;
-        AclUserJoin userJoin = 5;
-    }
+// AclAccountInvite contains the public invite key, the private part of which is sent to the user directly
+message AclAccountInvite {
+    bytes inviteKey = 1;
 }
 
-message AclData {
-    repeated AclContentValue aclContent = 1;
+// AclAccountRequestJoin contains the reference to the invite record and the data of the person who wants to join, confirmed by the private invite key
+message AclAccountRequestJoin {
+    bytes inviteIdentity = 1;
+    string inviteRecordId = 2;
+    bytes inviteIdentitySignature = 3;
+    bytes metadata = 4;
 }
 
-message AclState {
-    repeated string readKeyIds = 1;
-    repeated AclUserState userStates = 2;
-    map<string, AclUserInvite> invites = 3;
-}
-
-message AclUserState {
+// AclAccountRequestAccept contains the reference to join record and all read keys, encrypted with the identity of the requestor
+message AclAccountRequestAccept {
     bytes identity = 1;
-    AclUserPermissions permissions = 2;
+    string requestRecordId = 2;
+    repeated AclReadKeyWithRecord encryptedReadKeys = 3;
+    AclUserPermissions permissions = 4;
 }
 
-message AclUserAdd {
-    bytes identity = 1;
-    repeated bytes encryptedReadKeys = 2;
-    AclUserPermissions permissions = 3;
+// AclAccountRequestDecline contains the reference to join record
+message AclAccountRequestDecline {
+    string requestRecordId = 1;
 }
 
-message AclUserInvite {
-    bytes acceptPublicKey = 1;
-    repeated bytes encryptedReadKeys = 2;
-    AclUserPermissions permissions = 3;
+// AclAccountInviteRevoke revokes the invite record
+message AclAccountInviteRevoke {
+    string inviteRecordId = 1;
 }
 
-message AclUserJoin {
-    bytes identity = 1;
-    bytes acceptSignature = 2;
-    bytes acceptPubKey = 3;
-    repeated bytes encryptedReadKeys = 4;
+// AclReadKeys are a read key with record id
+message AclReadKeyWithRecord {
+    string recordId = 1;
+    bytes encryptedReadKey = 2;
 }
 
-message AclUserRemove {
-    bytes identity = 1;
-    repeated AclReadKeyReplace readKeyReplaces = 2;
-}
-
-message AclReadKeyReplace {
+// AclEncryptedReadKeys are new key for specific identity
+message AclEncryptedReadKey {
     bytes identity = 1;
     bytes encryptedReadKey = 2;
 }
 
-message AclUserPermissionChange {
+// AclAccountPermissionChange changes permissions of specific account
+message AclAccountPermissionChange {
     bytes identity = 1;
     AclUserPermissions permissions = 2;
 }
 
-enum AclUserPermissions {
-    Admin = 0;
-    Writer = 1;
-    Reader = 2;
+// AclReadKeyChange changes the key for a space
+message AclReadKeyChange {
+    repeated AclEncryptedReadKey accountKeys = 1;
 }
 
-message AclSyncMessage {
-    AclSyncContentValue content = 1;
+// AclAccountRemove removes an account and changes read key for space
+message AclAccountRemove {
+    repeated bytes identities = 1;
+    repeated AclEncryptedReadKey accountKeys = 2;
 }
 
-// AclSyncContentValue provides different types for acl sync
-message AclSyncContentValue {
+// AclAccountRequestRemove adds a request to remove an account
+message AclAccountRequestRemove {
+}
+
+// AclContentValue contains possible values for Acl
+message AclContentValue {
     oneof value {
-        AclAddRecords addRecords = 1;
+        AclAccountInvite invite = 1;
+        AclAccountInviteRevoke inviteRevoke = 2;
+        AclAccountRequestJoin requestJoin = 3;
+        AclAccountRequestAccept requestAccept = 4;
+        AclAccountPermissionChange permissionChange = 5;
+        AclAccountRemove accountRemove = 6;
+        AclReadKeyChange readKeyChange = 7;
+        AclAccountRequestDecline requestDecline = 8;
+        AclAccountRequestRemove accountRequestRemove = 9;
     }
 }
 
-message AclAddRecords {
-    repeated RawAclRecordWithId records = 1;
-}
+// AclData contains different acl content
+message AclData {
+    repeated AclContentValue aclContent = 1;
+}
+
+// AclUserPermissions contains different possible user roles
+enum AclUserPermissions {
+    None = 0;
+    Owner = 1;
+    Admin = 2;
+    Writer = 3;
+    Reader = 4;
+}

commonspace/object/acl/list/aclrecordbuilder.go

@@ -1,11 +1,14 @@
 package list
 
 import (
+	"time"
+
+	"github.com/anyproto/any-sync/commonspace/object/accountdata"
 	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 	"github.com/anyproto/any-sync/util/cidutil"
 	"github.com/anyproto/any-sync/util/crypto"
 	"github.com/gogo/protobuf/proto"
-	"time"
 )
 
 type RootContent struct {
@@ -15,26 +18,387 @@ type RootContent struct {
 	EncryptedReadKey []byte
 }
 
+type RequestJoinPayload struct {
+	InviteRecordId string
+	InviteKey      crypto.PrivKey
+	Metadata       []byte
+}
+
+type RequestAcceptPayload struct {
+	RequestRecordId string
+	Permissions     AclPermissions
+}
+
+type PermissionChangePayload struct {
+	Identity    crypto.PubKey
+	Permissions AclPermissions
+}
+
+type AccountRemovePayload struct {
+	Identities []crypto.PubKey
+	ReadKey    crypto.SymKey
+}
+
+type InviteResult struct {
+	InviteRec *consensusproto.RawRecord
+	InviteKey crypto.PrivKey
+}
+
 type AclRecordBuilder interface {
-	Unmarshall(rawIdRecord *aclrecordproto.RawAclRecordWithId) (rec *AclRecord, err error)
-	BuildRoot(content RootContent) (rec *aclrecordproto.RawAclRecordWithId, err error)
+	UnmarshallWithId(rawIdRecord *consensusproto.RawRecordWithId) (rec *AclRecord, err error)
+	Unmarshall(rawRecord *consensusproto.RawRecord) (rec *AclRecord, err error)
+
+	BuildRoot(content RootContent) (rec *consensusproto.RawRecordWithId, err error)
+	BuildInvite() (res InviteResult, err error)
+	BuildInviteRevoke(inviteRecordId string) (rawRecord *consensusproto.RawRecord, err error)
+	BuildRequestJoin(payload RequestJoinPayload) (rawRecord *consensusproto.RawRecord, err error)
+	BuildRequestAccept(payload RequestAcceptPayload) (rawRecord *consensusproto.RawRecord, err error)
+	BuildRequestDecline(requestRecordId string) (rawRecord *consensusproto.RawRecord, err error)
+	BuildRequestRemove() (rawRecord *consensusproto.RawRecord, err error)
+	BuildPermissionChange(payload PermissionChangePayload) (rawRecord *consensusproto.RawRecord, err error)
+	BuildReadKeyChange(newKey crypto.SymKey) (rawRecord *consensusproto.RawRecord, err error)
+	BuildAccountRemove(payload AccountRemovePayload) (rawRecord *consensusproto.RawRecord, err error)
 }
 
 type aclRecordBuilder struct {
-	id         string
-	keyStorage crypto.KeyStorage
+	id          string
+	keyStorage  crypto.KeyStorage
+	accountKeys *accountdata.AccountKeys
+	verifier    AcceptorVerifier
+	state       *AclState
 }
 
-func NewAclRecordBuilder(id string, keyStorage crypto.KeyStorage) AclRecordBuilder {
+func NewAclRecordBuilder(id string, keyStorage crypto.KeyStorage, keys *accountdata.AccountKeys, verifier AcceptorVerifier) AclRecordBuilder {
 	return &aclRecordBuilder{
-		id:         id,
-		keyStorage: keyStorage,
+		id:          id,
+		keyStorage:  keyStorage,
+		accountKeys: keys,
+		verifier:    verifier,
 	}
 }
 
-func (a *aclRecordBuilder) Unmarshall(rawIdRecord *aclrecordproto.RawAclRecordWithId) (rec *AclRecord, err error) {
+func (a *aclRecordBuilder) buildRecord(aclContent *aclrecordproto.AclContentValue) (rawRec *consensusproto.RawRecord, err error) {
+	aclData := &aclrecordproto.AclData{AclContent: []*aclrecordproto.AclContentValue{
+		aclContent,
+	}}
+	marshalledData, err := aclData.Marshal()
+	if err != nil {
+		return
+	}
+	protoKey, err := a.accountKeys.SignKey.GetPublic().Marshall()
+	if err != nil {
+		return
+	}
+	rec := &consensusproto.Record{
+		PrevId:    a.state.lastRecordId,
+		Identity:  protoKey,
+		Data:      marshalledData,
+		Timestamp: time.Now().Unix(),
+	}
+	marshalledRec, err := rec.Marshal()
+	if err != nil {
+		return
+	}
+	signature, err := a.accountKeys.SignKey.Sign(marshalledRec)
+	if err != nil {
+		return
+	}
+	rawRec = &consensusproto.RawRecord{
+		Payload:   marshalledRec,
+		Signature: signature,
+	}
+	return
+}
+
+func (a *aclRecordBuilder) BuildInvite() (res InviteResult, err error) {
+	if !a.state.Permissions(a.state.pubKey).CanManageAccounts() {
+		err = ErrInsufficientPermissions
+		return
+	}
+	privKey, pubKey, err := crypto.GenerateRandomEd25519KeyPair()
+	if err != nil {
+		return
+	}
+	invitePubKey, err := pubKey.Marshall()
+	if err != nil {
+		return
+	}
+	inviteRec := &aclrecordproto.AclAccountInvite{InviteKey: invitePubKey}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_Invite{Invite: inviteRec}}
+	rawRec, err := a.buildRecord(content)
+	if err != nil {
+		return
+	}
+	res.InviteKey = privKey
+	res.InviteRec = rawRec
+	return
+}
+
+func (a *aclRecordBuilder) BuildInviteRevoke(inviteRecordId string) (rawRecord *consensusproto.RawRecord, err error) {
+	if !a.state.Permissions(a.state.pubKey).CanManageAccounts() {
+		err = ErrInsufficientPermissions
+		return
+	}
+	_, exists := a.state.inviteKeys[inviteRecordId]
+	if !exists {
+		err = ErrNoSuchInvite
+		return
+	}
+	revokeRec := &aclrecordproto.AclAccountInviteRevoke{InviteRecordId: inviteRecordId}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_InviteRevoke{InviteRevoke: revokeRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildRequestJoin(payload RequestJoinPayload) (rawRecord *consensusproto.RawRecord, err error) {
+	key, exists := a.state.inviteKeys[payload.InviteRecordId]
+	if !exists {
+		err = ErrNoSuchInvite
+		return
+	}
+	if !payload.InviteKey.GetPublic().Equals(key) {
+		err = ErrIncorrectInviteKey
+	}
+	rawIdentity, err := a.accountKeys.SignKey.GetPublic().Raw()
+	if err != nil {
+		return
+	}
+	signature, err := payload.InviteKey.Sign(rawIdentity)
+	if err != nil {
+		return
+	}
+	protoIdentity, err := a.accountKeys.SignKey.GetPublic().Marshall()
+	if err != nil {
+		return
+	}
+	joinRec := &aclrecordproto.AclAccountRequestJoin{
+		InviteIdentity:          protoIdentity,
+		InviteRecordId:          payload.InviteRecordId,
+		InviteIdentitySignature: signature,
+		Metadata:                payload.Metadata,
+	}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_RequestJoin{RequestJoin: joinRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildRequestAccept(payload RequestAcceptPayload) (rawRecord *consensusproto.RawRecord, err error) {
+	if !a.state.Permissions(a.state.pubKey).CanManageAccounts() {
+		err = ErrInsufficientPermissions
+		return
+	}
+	request, exists := a.state.requestRecords[payload.RequestRecordId]
+	if !exists {
+		err = ErrNoSuchRequest
+		return
+	}
+	var encryptedReadKeys []*aclrecordproto.AclReadKeyWithRecord
+	for keyId, key := range a.state.userReadKeys {
+		rawKey, err := key.Raw()
+		if err != nil {
+			return nil, err
+		}
+		enc, err := request.RequestIdentity.Encrypt(rawKey)
+		if err != nil {
+			return nil, err
+		}
+		encryptedReadKeys = append(encryptedReadKeys, &aclrecordproto.AclReadKeyWithRecord{
+			RecordId:         keyId,
+			EncryptedReadKey: enc,
+		})
+	}
+	if err != nil {
+		return
+	}
+	requestIdentityProto, err := request.RequestIdentity.Marshall()
+	if err != nil {
+		return
+	}
+	acceptRec := &aclrecordproto.AclAccountRequestAccept{
+		Identity:          requestIdentityProto,
+		RequestRecordId:   payload.RequestRecordId,
+		EncryptedReadKeys: encryptedReadKeys,
+		Permissions:       aclrecordproto.AclUserPermissions(payload.Permissions),
+	}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_RequestAccept{RequestAccept: acceptRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildRequestDecline(requestRecordId string) (rawRecord *consensusproto.RawRecord, err error) {
+	if !a.state.Permissions(a.state.pubKey).CanManageAccounts() {
+		err = ErrInsufficientPermissions
+		return
+	}
+	_, exists := a.state.requestRecords[requestRecordId]
+	if !exists {
+		err = ErrNoSuchRequest
+		return
+	}
+	declineRec := &aclrecordproto.AclAccountRequestDecline{RequestRecordId: requestRecordId}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_RequestDecline{RequestDecline: declineRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildPermissionChange(payload PermissionChangePayload) (rawRecord *consensusproto.RawRecord, err error) {
+	permissions := a.state.Permissions(a.state.pubKey)
+	if !permissions.CanManageAccounts() || payload.Identity.Equals(a.state.pubKey) {
+		err = ErrInsufficientPermissions
+		return
+	}
+	if payload.Permissions.IsOwner() {
+		err = ErrIsOwner
+		return
+	}
+	protoIdentity, err := payload.Identity.Marshall()
+	if err != nil {
+		return
+	}
+	permissionRec := &aclrecordproto.AclAccountPermissionChange{
+		Identity:    protoIdentity,
+		Permissions: aclrecordproto.AclUserPermissions(payload.Permissions),
+	}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_PermissionChange{PermissionChange: permissionRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildReadKeyChange(newKey crypto.SymKey) (rawRecord *consensusproto.RawRecord, err error) {
+	if !a.state.Permissions(a.state.pubKey).CanManageAccounts() {
+		err = ErrInsufficientPermissions
+		return
+	}
+	rawKey, err := newKey.Raw()
+	if err != nil {
+		return
+	}
+	if len(rawKey) != crypto.KeyBytes {
+		err = ErrIncorrectReadKey
+		return
+	}
+	var aclReadKeys []*aclrecordproto.AclEncryptedReadKey
+	for _, st := range a.state.userStates {
+		protoIdentity, err := st.PubKey.Marshall()
+		if err != nil {
+			return nil, err
+		}
+		enc, err := st.PubKey.Encrypt(rawKey)
+		if err != nil {
+			return nil, err
+		}
+		aclReadKeys = append(aclReadKeys, &aclrecordproto.AclEncryptedReadKey{
+			Identity:         protoIdentity,
+			EncryptedReadKey: enc,
+		})
+	}
+	readRec := &aclrecordproto.AclReadKeyChange{AccountKeys: aclReadKeys}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_ReadKeyChange{ReadKeyChange: readRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildAccountRemove(payload AccountRemovePayload) (rawRecord *consensusproto.RawRecord, err error) {
+	deletedMap := map[string]struct{}{}
+	for _, key := range payload.Identities {
+		permissions := a.state.Permissions(key)
+		if permissions.IsOwner() {
+			return nil, ErrInsufficientPermissions
+		}
+		if permissions.NoPermissions() {
+			return nil, ErrNoSuchAccount
+		}
+		deletedMap[mapKeyFromPubKey(key)] = struct{}{}
+	}
+	if !a.state.Permissions(a.state.pubKey).CanManageAccounts() {
+		err = ErrInsufficientPermissions
+		return
+	}
+	rawKey, err := payload.ReadKey.Raw()
+	if err != nil {
+		return
+	}
+	if len(rawKey) != crypto.KeyBytes {
+		err = ErrIncorrectReadKey
+		return
+	}
+	var aclReadKeys []*aclrecordproto.AclEncryptedReadKey
+	for _, st := range a.state.userStates {
+		if _, exists := deletedMap[mapKeyFromPubKey(st.PubKey)]; exists {
+			continue
+		}
+		protoIdentity, err := st.PubKey.Marshall()
+		if err != nil {
+			return nil, err
+		}
+		enc, err := st.PubKey.Encrypt(rawKey)
+		if err != nil {
+			return nil, err
+		}
+		aclReadKeys = append(aclReadKeys, &aclrecordproto.AclEncryptedReadKey{
+			Identity:         protoIdentity,
+			EncryptedReadKey: enc,
+		})
+	}
+	var marshalledIdentities [][]byte
+	for _, key := range payload.Identities {
+		protoIdentity, err := key.Marshall()
+		if err != nil {
+			return nil, err
+		}
+		marshalledIdentities = append(marshalledIdentities, protoIdentity)
+	}
+	removeRec := &aclrecordproto.AclAccountRemove{AccountKeys: aclReadKeys, Identities: marshalledIdentities}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_AccountRemove{AccountRemove: removeRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) BuildRequestRemove() (rawRecord *consensusproto.RawRecord, err error) {
+	permissions := a.state.Permissions(a.state.pubKey)
+	if permissions.NoPermissions() {
+		err = ErrNoSuchAccount
+		return
+	}
+	if permissions.IsOwner() {
+		err = ErrIsOwner
+		return
+	}
+	removeRec := &aclrecordproto.AclAccountRequestRemove{}
+	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_AccountRequestRemove{AccountRequestRemove: removeRec}}
+	return a.buildRecord(content)
+}
+
+func (a *aclRecordBuilder) Unmarshall(rawRecord *consensusproto.RawRecord) (rec *AclRecord, err error) {
+	aclRecord := &consensusproto.Record{}
+	err = proto.Unmarshal(rawRecord.Payload, aclRecord)
+	if err != nil {
+		return
+	}
+	pubKey, err := a.keyStorage.PubKeyFromProto(aclRecord.Identity)
+	if err != nil {
+		return
+	}
+	aclData := &aclrecordproto.AclData{}
+	err = proto.Unmarshal(aclRecord.Data, aclData)
+	if err != nil {
+		return
+	}
+	rec = &AclRecord{
+		PrevId:    aclRecord.PrevId,
+		Timestamp: aclRecord.Timestamp,
+		Data:      aclRecord.Data,
+		Signature: rawRecord.Signature,
+		Identity:  pubKey,
+		Model:     aclData,
+	}
+	res, err := pubKey.Verify(rawRecord.Payload, rawRecord.Signature)
+	if err != nil {
+		return
+	}
+	if !res {
+		err = ErrInvalidSignature
+		return
+	}
+	return
+}
+
+func (a *aclRecordBuilder) UnmarshallWithId(rawIdRecord *consensusproto.RawRecordWithId) (rec *AclRecord, err error) {
 	var (
-		rawRec = &aclrecordproto.RawAclRecord{}
+		rawRec = &consensusproto.RawRecord{}
 		pubKey crypto.PubKey
 	)
 	err = proto.Unmarshal(rawIdRecord.Payload, rawRec)
@@ -53,14 +417,17 @@ func (a *aclRecordBuilder) Unmarshall(rawIdRecord *aclrecordproto.RawAclRecordWi
 		}
 		rec = &AclRecord{
 			Id:        rawIdRecord.Id,
-			ReadKeyId: rawIdRecord.Id,
 			Timestamp: aclRoot.Timestamp,
 			Signature: rawRec.Signature,
 			Identity:  pubKey,
 			Model:     aclRoot,
 		}
 	} else {
-		aclRecord := &aclrecordproto.AclRecord{}
+		err = a.verifier.VerifyAcceptor(rawRec)
+		if err != nil {
+			return
+		}
+		aclRecord := &consensusproto.Record{}
 		err = proto.Unmarshal(rawRec.Payload, aclRecord)
 		if err != nil {
 			return
@@ -69,14 +436,19 @@ func (a *aclRecordBuilder) Unmarshall(rawIdRecord *aclrecordproto.RawAclRecordWi
 		if err != nil {
 			return
 		}
+		aclData := &aclrecordproto.AclData{}
+		err = proto.Unmarshal(aclRecord.Data, aclData)
+		if err != nil {
+			return
+		}
 		rec = &AclRecord{
 			Id:        rawIdRecord.Id,
 			PrevId:    aclRecord.PrevId,
-			ReadKeyId: aclRecord.ReadKeyId,
 			Timestamp: aclRecord.Timestamp,
 			Data:      aclRecord.Data,
 			Signature: rawRec.Signature,
 			Identity:  pubKey,
+			Model:     aclData,
 		}
 	}
 
@@ -84,7 +456,7 @@ func (a *aclRecordBuilder) Unmarshall(rawIdRecord *aclrecordproto.RawAclRecordWi
 	return
 }
 
-func (a *aclRecordBuilder) BuildRoot(content RootContent) (rec *aclrecordproto.RawAclRecordWithId, err error) {
+func (a *aclRecordBuilder) BuildRoot(content RootContent) (rec *consensusproto.RawRecordWithId, err error) {
 	rawIdentity, err := content.PrivKey.GetPublic().Raw()
 	if err != nil {
 		return
@@ -118,8 +490,8 @@ func (a *aclRecordBuilder) BuildRoot(content RootContent) (rec *aclrecordproto.R
 
 func verifyRaw(
 	pubKey crypto.PubKey,
-	rawRec *aclrecordproto.RawAclRecord,
-	recWithId *aclrecordproto.RawAclRecordWithId) (err error) {
+	rawRec *consensusproto.RawRecord,
+	recWithId *consensusproto.RawRecordWithId) (err error) {
 	// verifying signature
 	res, err := pubKey.Verify(rawRec.Payload, rawRec.Signature)
 	if err != nil {
@@ -137,7 +509,7 @@ func verifyRaw(
 	return
 }
 
-func marshalAclRoot(aclRoot *aclrecordproto.AclRoot, key crypto.PrivKey) (rawWithId *aclrecordproto.RawAclRecordWithId, err error) {
+func marshalAclRoot(aclRoot *aclrecordproto.AclRoot, key crypto.PrivKey) (rawWithId *consensusproto.RawRecordWithId, err error) {
 	marshalledRoot, err := aclRoot.Marshal()
 	if err != nil {
 		return
@@ -146,7 +518,7 @@ func marshalAclRoot(aclRoot *aclrecordproto.AclRoot, key crypto.PrivKey) (rawWit
 	if err != nil {
 		return
 	}
-	raw := &aclrecordproto.RawAclRecord{
+	raw := &consensusproto.RawRecord{
 		Payload:   marshalledRoot,
 		Signature: signature,
 	}
@@ -158,7 +530,7 @@ func marshalAclRoot(aclRoot *aclrecordproto.AclRoot, key crypto.PrivKey) (rawWit
 	if err != nil {
 		return
 	}
-	rawWithId = &aclrecordproto.RawAclRecordWithId{
+	rawWithId = &consensusproto.RawRecordWithId{
 		Payload: marshalledRaw,
 		Id:      aclHeadId,
 	}

commonspace/object/acl/list/aclrecordbuilder_test.go

@@ -1,9 +0,0 @@
-package list
-
-import (
-	"testing"
-)
-
-func TestAclRecordBuilder_BuildUserJoin(t *testing.T) {
-	return
-}

commonspace/object/acl/list/aclstate.go

@@ -2,7 +2,7 @@ package list
 
 import (
 	"errors"
-	"fmt"
+
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
 	"github.com/anyproto/any-sync/util/crypto"
@@ -13,19 +13,24 @@ import (
 var log = logger.NewNamedSugared("common.commonspace.acllist")
 
 var (
-	ErrNoSuchUser              = errors.New("no such user")
-	ErrFailedToDecrypt         = errors.New("failed to decrypt key")
-	ErrUserRemoved             = errors.New("user was removed from the document")
-	ErrDocumentForbidden       = errors.New("your user was forbidden access to the document")
-	ErrUserAlreadyExists       = errors.New("user already exists")
-	ErrNoSuchRecord            = errors.New("no such record")
-	ErrNoSuchInvite            = errors.New("no such invite")
-	ErrOldInvite               = errors.New("invite is too old")
-	ErrInsufficientPermissions = errors.New("insufficient permissions")
-	ErrNoReadKey               = errors.New("acl state doesn't have a read key")
-	ErrInvalidSignature        = errors.New("signature is invalid")
-	ErrIncorrectRoot           = errors.New("incorrect root")
-	ErrIncorrectRecordSequence = errors.New("incorrect prev id of a record")
+	ErrNoSuchAccount             = errors.New("no such account")
+	ErrPendingRequest            = errors.New("already exists pending request")
+	ErrUnexpectedContentType     = errors.New("unexpected content type")
+	ErrIncorrectIdentity         = errors.New("incorrect identity")
+	ErrIncorrectInviteKey        = errors.New("incorrect invite key")
+	ErrFailedToDecrypt           = errors.New("failed to decrypt key")
+	ErrNoSuchRecord              = errors.New("no such record")
+	ErrNoSuchRequest             = errors.New("no such request")
+	ErrNoSuchInvite              = errors.New("no such invite")
+	ErrInsufficientPermissions   = errors.New("insufficient permissions")
+	ErrIsOwner                   = errors.New("can't be made by owner")
+	ErrIncorrectNumberOfAccounts = errors.New("incorrect number of accounts")
+	ErrDuplicateAccounts         = errors.New("duplicate accounts")
+	ErrNoReadKey                 = errors.New("acl state doesn't have a read key")
+	ErrIncorrectReadKey          = errors.New("incorrect read key")
+	ErrInvalidSignature          = errors.New("signature is invalid")
+	ErrIncorrectRoot             = errors.New("incorrect root")
+	ErrIncorrectRecordSequence   = errors.New("incorrect prev id of a record")
 )
 
 type UserPermissionPair struct {
@@ -36,37 +41,71 @@ type UserPermissionPair struct {
 type AclState struct {
 	id               string
 	currentReadKeyId string
-	userReadKeys     map[string]crypto.SymKey
-	userStates       map[string]AclUserState
-	statesAtRecord   map[string][]AclUserState
-	key              crypto.PrivKey
-	pubKey           crypto.PubKey
-	keyStore         crypto.KeyStorage
-	totalReadKeys    int
+	// userReadKeys is a map recordId -> read key which tells us about every read key
+	userReadKeys map[string]crypto.SymKey
+	// userStates is a map pubKey -> state which defines current user state
+	userStates map[string]AclUserState
+	// statesAtRecord is a map recordId -> state which define user state at particular record
+	//  probably this can grow rather large at some point, so we can maybe optimise later to have:
+	//  - map pubKey -> []recordIds (where recordIds is an array where such identity permissions were changed)
+	statesAtRecord map[string][]AclUserState
+	// inviteKeys is a map recordId -> invite
+	inviteKeys map[string]crypto.PubKey
+	// requestRecords is a map recordId -> RequestRecord
+	requestRecords map[string]RequestRecord
+	// pendingRequests is a map pubKey -> recordId
+	pendingRequests map[string]string
+	key             crypto.PrivKey
+	pubKey          crypto.PubKey
+	keyStore        crypto.KeyStorage
+	totalReadKeys   int
 
-	lastRecordId string
+	lastRecordId     string
+	contentValidator ContentValidator
 }
 
 func newAclStateWithKeys(
 	id string,
 	key crypto.PrivKey) (*AclState, error) {
-	return &AclState{
-		id:             id,
-		key:            key,
-		pubKey:         key.GetPublic(),
-		userReadKeys:   make(map[string]crypto.SymKey),
-		userStates:     make(map[string]AclUserState),
-		statesAtRecord: make(map[string][]AclUserState),
-	}, nil
+	st := &AclState{
+		id:              id,
+		key:             key,
+		pubKey:          key.GetPublic(),
+		userReadKeys:    make(map[string]crypto.SymKey),
+		userStates:      make(map[string]AclUserState),
+		statesAtRecord:  make(map[string][]AclUserState),
+		inviteKeys:      make(map[string]crypto.PubKey),
+		requestRecords:  make(map[string]RequestRecord),
+		pendingRequests: make(map[string]string),
+		keyStore:        crypto.NewKeyStorage(),
+	}
+	st.contentValidator = &contentValidator{
+		keyStore: st.keyStore,
+		aclState: st,
+	}
+	return st, nil
 }
 
 func newAclState(id string) *AclState {
-	return &AclState{
-		id:             id,
-		userReadKeys:   make(map[string]crypto.SymKey),
-		userStates:     make(map[string]AclUserState),
-		statesAtRecord: make(map[string][]AclUserState),
+	st := &AclState{
+		id:              id,
+		userReadKeys:    make(map[string]crypto.SymKey),
+		userStates:      make(map[string]AclUserState),
+		statesAtRecord:  make(map[string][]AclUserState),
+		inviteKeys:      make(map[string]crypto.PubKey),
+		requestRecords:  make(map[string]RequestRecord),
+		pendingRequests: make(map[string]string),
+		keyStore:        crypto.NewKeyStorage(),
 	}
+	st.contentValidator = &contentValidator{
+		keyStore: st.keyStore,
+		aclState: st,
+	}
+	return st
+}
+
+func (st *AclState) Validator() ContentValidator {
+	return st.contentValidator
 }
 
 func (st *AclState) CurrentReadKeyId() string {
@@ -74,7 +113,7 @@ func (st *AclState) CurrentReadKeyId() string {
 }
 
 func (st *AclState) CurrentReadKey() (crypto.SymKey, error) {
-	key, exists := st.userReadKeys[st.currentReadKeyId]
+	key, exists := st.userReadKeys[st.CurrentReadKeyId()]
 	if !exists {
 		return nil, ErrNoReadKey
 	}
@@ -97,7 +136,7 @@ func (st *AclState) StateAtRecord(id string, pubKey crypto.PubKey) (AclUserState
 			return perm, nil
 		}
 	}
-	return AclUserState{}, ErrNoSuchUser
+	return AclUserState{}, ErrNoSuchAccount
 }
 
 func (st *AclState) applyRecord(record *AclRecord) (err error) {
@@ -110,17 +149,18 @@ func (st *AclState) applyRecord(record *AclRecord) (err error) {
 		err = ErrIncorrectRecordSequence
 		return
 	}
+	// if the record is root record
 	if record.Id == st.id {
 		err = st.applyRoot(record)
 		if err != nil {
 			return
 		}
 		st.statesAtRecord[record.Id] = []AclUserState{
-			{PubKey: record.Identity, Permissions: aclrecordproto.AclUserPermissions_Admin},
+			st.userStates[mapKeyFromPubKey(record.Identity)],
 		}
 		return
 	}
-
+	// if the model is not cached
 	if record.Model == nil {
 		aclData := &aclrecordproto.AclData{}
 		err = proto.Unmarshal(record.Data, aclData)
@@ -129,18 +169,16 @@ func (st *AclState) applyRecord(record *AclRecord) (err error) {
 		}
 		record.Model = aclData
 	}
-
+	// applying records contents
 	err = st.applyChangeData(record)
 	if err != nil {
 		return
 	}
-
-	// getting all states for users at record
+	// getting all states for users at record and saving them
 	var states []AclUserState
 	for _, state := range st.userStates {
 		states = append(states, state)
 	}
-
 	st.statesAtRecord[record.Id] = states
 	return
 }
@@ -156,9 +194,9 @@ func (st *AclState) applyRoot(record *AclRecord) (err error) {
 	// adding user to the list
 	userState := AclUserState{
 		PubKey:      record.Identity,
-		Permissions: aclrecordproto.AclUserPermissions_Admin,
+		Permissions: AclPermissions(aclrecordproto.AclUserPermissions_Owner),
 	}
-	st.currentReadKeyId = record.ReadKeyId
+	st.currentReadKeyId = record.Id
 	st.userStates[mapKeyFromPubKey(record.Identity)] = userState
 	st.totalReadKeys++
 	return
@@ -181,92 +219,191 @@ func (st *AclState) saveReadKeyFromRoot(record *AclRecord) (err error) {
 			return
 		}
 	}
-
 	st.userReadKeys[record.Id] = readKey
 	return
 }
 
 func (st *AclState) applyChangeData(record *AclRecord) (err error) {
-	defer func() {
-		if err != nil {
-			return
-		}
-		if record.ReadKeyId != st.currentReadKeyId {
-			st.totalReadKeys++
-			st.currentReadKeyId = record.ReadKeyId
-		}
-	}()
 	model := record.Model.(*aclrecordproto.AclData)
-	if !st.isUserJoin(model) {
-		// we check signature when we add this to the List, so no need to do it here
-		if _, exists := st.userStates[mapKeyFromPubKey(record.Identity)]; !exists {
-			err = ErrNoSuchUser
-			return
-		}
-
-		// only Admins can do non-user join changes
-		if !st.HasPermission(record.Identity, aclrecordproto.AclUserPermissions_Admin) {
-			// TODO: add string encoding
-			err = fmt.Errorf("user %s must have admin permissions", record.Identity.Account())
-			return
-		}
-	}
-
 	for _, ch := range model.GetAclContent() {
-		if err = st.applyChangeContent(ch, record.Id); err != nil {
+		if err = st.applyChangeContent(ch, record.Id, record.Identity); err != nil {
 			log.Info("error while applying changes: %v; ignore", zap.Error(err))
 			return err
 		}
 	}
-
 	return nil
 }
 
-func (st *AclState) applyChangeContent(ch *aclrecordproto.AclContentValue, recordId string) error {
+func (st *AclState) applyChangeContent(ch *aclrecordproto.AclContentValue, recordId string, authorIdentity crypto.PubKey) error {
 	switch {
-	case ch.GetUserPermissionChange() != nil:
-		return st.applyUserPermissionChange(ch.GetUserPermissionChange(), recordId)
-	case ch.GetUserAdd() != nil:
-		return st.applyUserAdd(ch.GetUserAdd(), recordId)
-	case ch.GetUserRemove() != nil:
-		return st.applyUserRemove(ch.GetUserRemove(), recordId)
-	case ch.GetUserInvite() != nil:
-		return st.applyUserInvite(ch.GetUserInvite(), recordId)
-	case ch.GetUserJoin() != nil:
-		return st.applyUserJoin(ch.GetUserJoin(), recordId)
+	case ch.GetPermissionChange() != nil:
+		return st.applyPermissionChange(ch.GetPermissionChange(), recordId, authorIdentity)
+	case ch.GetInvite() != nil:
+		return st.applyInvite(ch.GetInvite(), recordId, authorIdentity)
+	case ch.GetInviteRevoke() != nil:
+		return st.applyInviteRevoke(ch.GetInviteRevoke(), recordId, authorIdentity)
+	case ch.GetRequestJoin() != nil:
+		return st.applyRequestJoin(ch.GetRequestJoin(), recordId, authorIdentity)
+	case ch.GetRequestAccept() != nil:
+		return st.applyRequestAccept(ch.GetRequestAccept(), recordId, authorIdentity)
+	case ch.GetRequestDecline() != nil:
+		return st.applyRequestDecline(ch.GetRequestDecline(), recordId, authorIdentity)
+	case ch.GetAccountRemove() != nil:
+		return st.applyAccountRemove(ch.GetAccountRemove(), recordId, authorIdentity)
+	case ch.GetReadKeyChange() != nil:
+		return st.applyReadKeyChange(ch.GetReadKeyChange(), recordId, authorIdentity)
+	case ch.GetAccountRequestRemove() != nil:
+		return st.applyRequestRemove(ch.GetAccountRequestRemove(), recordId, authorIdentity)
 	default:
-		return fmt.Errorf("unexpected change type: %v", ch)
+		return ErrUnexpectedContentType
 	}
 }
 
-func (st *AclState) applyUserPermissionChange(ch *aclrecordproto.AclUserPermissionChange, recordId string) error {
+func (st *AclState) applyPermissionChange(ch *aclrecordproto.AclAccountPermissionChange, recordId string, authorIdentity crypto.PubKey) error {
 	chIdentity, err := st.keyStore.PubKeyFromProto(ch.Identity)
 	if err != nil {
 		return err
 	}
-	state, exists := st.userStates[mapKeyFromPubKey(chIdentity)]
-	if !exists {
-		return ErrNoSuchUser
+	err = st.contentValidator.ValidatePermissionChange(ch, authorIdentity)
+	if err != nil {
+		return err
 	}
-
-	state.Permissions = ch.Permissions
+	stringKey := mapKeyFromPubKey(chIdentity)
+	state, _ := st.userStates[stringKey]
+	state.Permissions = AclPermissions(ch.Permissions)
+	st.userStates[stringKey] = state
 	return nil
 }
 
-func (st *AclState) applyUserInvite(ch *aclrecordproto.AclUserInvite, recordId string) error {
-	// TODO: check old code and bring it back :-)
+func (st *AclState) applyInvite(ch *aclrecordproto.AclAccountInvite, recordId string, authorIdentity crypto.PubKey) error {
+	inviteKey, err := st.keyStore.PubKeyFromProto(ch.InviteKey)
+	if err != nil {
+		return err
+	}
+	err = st.contentValidator.ValidateInvite(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	st.inviteKeys[recordId] = inviteKey
 	return nil
 }
 
-func (st *AclState) applyUserJoin(ch *aclrecordproto.AclUserJoin, recordId string) error {
+func (st *AclState) applyInviteRevoke(ch *aclrecordproto.AclAccountInviteRevoke, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateInviteRevoke(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	delete(st.inviteKeys, ch.InviteRecordId)
 	return nil
 }
 
-func (st *AclState) applyUserAdd(ch *aclrecordproto.AclUserAdd, recordId string) error {
+func (st *AclState) applyRequestJoin(ch *aclrecordproto.AclAccountRequestJoin, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateRequestJoin(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	st.pendingRequests[mapKeyFromPubKey(authorIdentity)] = recordId
+	st.requestRecords[recordId] = RequestRecord{
+		RequestIdentity: authorIdentity,
+		RequestMetadata: ch.Metadata,
+		Type:            RequestTypeJoin,
+	}
 	return nil
 }
 
-func (st *AclState) applyUserRemove(ch *aclrecordproto.AclUserRemove, recordId string) error {
+func (st *AclState) applyRequestAccept(ch *aclrecordproto.AclAccountRequestAccept, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateRequestAccept(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	acceptIdentity, err := st.keyStore.PubKeyFromProto(ch.Identity)
+	if err != nil {
+		return err
+	}
+	record, _ := st.requestRecords[ch.RequestRecordId]
+	st.userStates[mapKeyFromPubKey(acceptIdentity)] = AclUserState{
+		PubKey:          acceptIdentity,
+		Permissions:     AclPermissions(ch.Permissions),
+		RequestMetadata: record.RequestMetadata,
+	}
+	delete(st.pendingRequests, mapKeyFromPubKey(st.requestRecords[ch.RequestRecordId].RequestIdentity))
+	if !st.pubKey.Equals(acceptIdentity) {
+		return nil
+	}
+	for _, key := range ch.EncryptedReadKeys {
+		decrypted, err := st.key.Decrypt(key.EncryptedReadKey)
+		if err != nil {
+			return err
+		}
+		sym, err := crypto.UnmarshallAESKey(decrypted)
+		if err != nil {
+			return err
+		}
+		st.userReadKeys[key.RecordId] = sym
+	}
+	return nil
+}
+
+func (st *AclState) applyRequestDecline(ch *aclrecordproto.AclAccountRequestDecline, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateRequestDecline(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	delete(st.pendingRequests, mapKeyFromPubKey(st.requestRecords[ch.RequestRecordId].RequestIdentity))
+	delete(st.requestRecords, ch.RequestRecordId)
+	return nil
+}
+
+func (st *AclState) applyRequestRemove(ch *aclrecordproto.AclAccountRequestRemove, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateRequestRemove(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	st.requestRecords[recordId] = RequestRecord{
+		RequestIdentity: authorIdentity,
+		Type:            RequestTypeRemove,
+	}
+	st.pendingRequests[mapKeyFromPubKey(authorIdentity)] = recordId
+	return nil
+}
+
+func (st *AclState) applyAccountRemove(ch *aclrecordproto.AclAccountRemove, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateAccountRemove(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	for _, rawIdentity := range ch.Identities {
+		identity, err := st.keyStore.PubKeyFromProto(rawIdentity)
+		if err != nil {
+			return err
+		}
+		idKey := mapKeyFromPubKey(identity)
+		delete(st.userStates, idKey)
+		delete(st.pendingRequests, idKey)
+	}
+	return st.updateReadKey(ch.AccountKeys, recordId)
+}
+
+func (st *AclState) applyReadKeyChange(ch *aclrecordproto.AclReadKeyChange, recordId string, authorIdentity crypto.PubKey) error {
+	err := st.contentValidator.ValidateReadKeyChange(ch, authorIdentity)
+	if err != nil {
+		return err
+	}
+	return st.updateReadKey(ch.AccountKeys, recordId)
+}
+
+func (st *AclState) updateReadKey(keys []*aclrecordproto.AclEncryptedReadKey, recordId string) error {
+	for _, accKey := range keys {
+		identity, _ := st.keyStore.PubKeyFromProto(accKey.Identity)
+		if st.pubKey.Equals(identity) {
+			res, err := st.decryptReadKey(accKey.EncryptedReadKey)
+			if err != nil {
+				return err
+			}
+			st.userReadKeys[recordId] = res
+		}
+	}
+	st.currentReadKeyId = recordId
 	return nil
 }
 
@@ -275,7 +412,6 @@ func (st *AclState) decryptReadKey(msg []byte) (crypto.SymKey, error) {
 	if err != nil {
 		return nil, ErrFailedToDecrypt
 	}
-
 	key, err := crypto.UnmarshallAESKey(decrypted)
 	if err != nil {
 		return nil, ErrFailedToDecrypt
@@ -283,29 +419,31 @@ func (st *AclState) decryptReadKey(msg []byte) (crypto.SymKey, error) {
 	return key, nil
 }
 
-func (st *AclState) HasPermission(identity crypto.PubKey, permission aclrecordproto.AclUserPermissions) bool {
+func (st *AclState) Permissions(identity crypto.PubKey) AclPermissions {
 	state, exists := st.userStates[mapKeyFromPubKey(identity)]
 	if !exists {
-		return false
+		return AclPermissions(aclrecordproto.AclUserPermissions_None)
 	}
-
-	return state.Permissions == permission
+	return state.Permissions
 }
 
-func (st *AclState) isUserJoin(data *aclrecordproto.AclData) bool {
-	// if we have a UserJoin, then it should always be the first one applied
-	return data.GetAclContent() != nil && data.GetAclContent()[0].GetUserJoin() != nil
+func (st *AclState) JoinRecords() (records []RequestRecord) {
+	for _, recId := range st.pendingRequests {
+		rec := st.requestRecords[recId]
+		if rec.Type == RequestTypeJoin {
+			records = append(records, rec)
+		}
+	}
+	return
 }
 
-func (st *AclState) isUserAdd(data *aclrecordproto.AclData, identity []byte) bool {
-	return false
-}
-
-func (st *AclState) UserStates() map[string]AclUserState {
-	return st.userStates
-}
-
-func (st *AclState) Invite(acceptPubKey []byte) (invite *aclrecordproto.AclUserInvite, err error) {
+func (st *AclState) RemoveRecords() (records []RequestRecord) {
+	for _, recId := range st.pendingRequests {
+		rec := st.requestRecords[recId]
+		if rec.Type == RequestTypeRemove {
+			records = append(records, rec)
+		}
+	}
 	return
 }
 

commonspace/object/acl/list/list.go

@@ -5,16 +5,21 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/anyproto/any-sync/commonspace/object/accountdata"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
-	"github.com/anyproto/any-sync/commonspace/object/acl/liststorage"
-	"github.com/anyproto/any-sync/util/crypto"
 	"sync"
+
+	"github.com/anyproto/any-sync/commonspace/object/accountdata"
+	"github.com/anyproto/any-sync/commonspace/object/acl/liststorage"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/anyproto/any-sync/util/cidutil"
+	"github.com/anyproto/any-sync/util/crypto"
 )
 
 type IterFunc = func(record *AclRecord) (IsContinue bool)
 
-var ErrIncorrectCID = errors.New("incorrect CID")
+var (
+	ErrIncorrectCID        = errors.New("incorrect CID")
+	ErrRecordAlreadyExists = errors.New("record already exists")
+)
 
 type RWLocker interface {
 	sync.Locker
@@ -22,26 +27,46 @@ type RWLocker interface {
 	RUnlock()
 }
 
+type AcceptorVerifier interface {
+	VerifyAcceptor(rec *consensusproto.RawRecord) (err error)
+}
+
+type NoOpAcceptorVerifier struct {
+}
+
+func (n NoOpAcceptorVerifier) VerifyAcceptor(rec *consensusproto.RawRecord) (err error) {
+	return nil
+}
+
 type AclList interface {
 	RWLocker
 	Id() string
-	Root() *aclrecordproto.RawAclRecordWithId
+	Root() *consensusproto.RawRecordWithId
 	Records() []*AclRecord
 	AclState() *AclState
 	IsAfter(first string, second string) (bool, error)
+	HasHead(head string) bool
 	Head() *AclRecord
+
+	RecordsAfter(ctx context.Context, id string) (records []*consensusproto.RawRecordWithId, err error)
+	RecordsBefore(ctx context.Context, headId string) (records []*consensusproto.RawRecordWithId, err error)
 	Get(id string) (*AclRecord, error)
+	GetIndex(idx int) (*AclRecord, error)
 	Iterate(iterFunc IterFunc)
 	IterateFrom(startId string, iterFunc IterFunc)
+
 	KeyStorage() crypto.KeyStorage
+	RecordBuilder() AclRecordBuilder
 
-	AddRawRecord(rawRec *aclrecordproto.RawAclRecordWithId) (added bool, err error)
+	ValidateRawRecord(record *consensusproto.RawRecord) (err error)
+	AddRawRecord(rawRec *consensusproto.RawRecordWithId) (err error)
+	AddRawRecords(rawRecords []*consensusproto.RawRecordWithId) (err error)
 
-	Close() (err error)
+	Close(ctx context.Context) (err error)
 }
 
 type aclList struct {
-	root    *aclrecordproto.RawAclRecordWithId
+	root    *consensusproto.RawRecordWithId
 	records []*AclRecord
 	indexes map[string]int
 	id      string
@@ -55,18 +80,45 @@ type aclList struct {
 	sync.RWMutex
 }
 
-func BuildAclListWithIdentity(acc *accountdata.AccountKeys, storage liststorage.ListStorage) (AclList, error) {
-	builder := newAclStateBuilderWithIdentity(acc)
-	keyStorage := crypto.NewKeyStorage()
-	return build(storage.Id(), keyStorage, builder, NewAclRecordBuilder(storage.Id(), keyStorage), storage)
+type internalDeps struct {
+	storage          liststorage.ListStorage
+	keyStorage       crypto.KeyStorage
+	stateBuilder     *aclStateBuilder
+	recordBuilder    AclRecordBuilder
+	acceptorVerifier AcceptorVerifier
 }
 
-func BuildAclList(storage liststorage.ListStorage) (AclList, error) {
+func BuildAclListWithIdentity(acc *accountdata.AccountKeys, storage liststorage.ListStorage, verifier AcceptorVerifier) (AclList, error) {
 	keyStorage := crypto.NewKeyStorage()
-	return build(storage.Id(), keyStorage, newAclStateBuilder(), NewAclRecordBuilder(storage.Id(), crypto.NewKeyStorage()), storage)
+	deps := internalDeps{
+		storage:          storage,
+		keyStorage:       keyStorage,
+		stateBuilder:     newAclStateBuilderWithIdentity(acc),
+		recordBuilder:    NewAclRecordBuilder(storage.Id(), keyStorage, acc, verifier),
+		acceptorVerifier: verifier,
+	}
+	return build(deps)
 }
 
-func build(id string, keyStorage crypto.KeyStorage, stateBuilder *aclStateBuilder, recBuilder AclRecordBuilder, storage liststorage.ListStorage) (list AclList, err error) {
+func BuildAclList(storage liststorage.ListStorage, verifier AcceptorVerifier) (AclList, error) {
+	keyStorage := crypto.NewKeyStorage()
+	deps := internalDeps{
+		storage:          storage,
+		keyStorage:       keyStorage,
+		stateBuilder:     newAclStateBuilder(),
+		recordBuilder:    NewAclRecordBuilder(storage.Id(), keyStorage, nil, verifier),
+		acceptorVerifier: verifier,
+	}
+	return build(deps)
+}
+
+func build(deps internalDeps) (list AclList, err error) {
+	var (
+		storage      = deps.storage
+		id           = deps.storage.Id()
+		recBuilder   = deps.recordBuilder
+		stateBuilder = deps.stateBuilder
+	)
 	head, err := storage.Head()
 	if err != nil {
 		return
@@ -77,7 +129,7 @@ func build(id string, keyStorage crypto.KeyStorage, stateBuilder *aclStateBuilde
 		return
 	}
 
-	record, err := recBuilder.Unmarshall(rawRecordWithId)
+	record, err := recBuilder.UnmarshallWithId(rawRecordWithId)
 	if err != nil {
 		return
 	}
@@ -89,7 +141,7 @@ func build(id string, keyStorage crypto.KeyStorage, stateBuilder *aclStateBuilde
 			return
 		}
 
-		record, err = recBuilder.Unmarshall(rawRecordWithId)
+		record, err = recBuilder.UnmarshallWithId(rawRecordWithId)
 		if err != nil {
 			return
 		}
@@ -119,6 +171,7 @@ func build(id string, keyStorage crypto.KeyStorage, stateBuilder *aclStateBuilde
 		return
 	}
 
+	recBuilder.(*aclRecordBuilder).state = state
 	list = &aclList{
 		root:          rootWithId,
 		records:       records,
@@ -132,15 +185,37 @@ func build(id string, keyStorage crypto.KeyStorage, stateBuilder *aclStateBuilde
 	return
 }
 
+func (a *aclList) RecordBuilder() AclRecordBuilder {
+	return a.recordBuilder
+}
+
 func (a *aclList) Records() []*AclRecord {
 	return a.records
 }
 
-func (a *aclList) AddRawRecord(rawRec *aclrecordproto.RawAclRecordWithId) (added bool, err error) {
-	if _, ok := a.indexes[rawRec.Id]; ok {
+func (a *aclList) ValidateRawRecord(rawRec *consensusproto.RawRecord) (err error) {
+	record, err := a.recordBuilder.Unmarshall(rawRec)
+	if err != nil {
 		return
 	}
-	record, err := a.recordBuilder.Unmarshall(rawRec)
+	return a.aclState.Validator().ValidateAclRecordContents(record)
+}
+
+func (a *aclList) AddRawRecords(rawRecords []*consensusproto.RawRecordWithId) (err error) {
+	for _, rec := range rawRecords {
+		err = a.AddRawRecord(rec)
+		if err != nil && err != ErrRecordAlreadyExists {
+			return
+		}
+	}
+	return
+}
+
+func (a *aclList) AddRawRecord(rawRec *consensusproto.RawRecordWithId) (err error) {
+	if _, ok := a.indexes[rawRec.Id]; ok {
+		return ErrRecordAlreadyExists
+	}
+	record, err := a.recordBuilder.UnmarshallWithId(rawRec)
 	if err != nil {
 		return
 	}
@@ -155,15 +230,6 @@ func (a *aclList) AddRawRecord(rawRec *aclrecordproto.RawAclRecordWithId) (added
 	if err = a.storage.SetHead(rawRec.Id); err != nil {
 		return
 	}
-	return true, nil
-}
-
-func (a *aclList) IsValidNext(rawRec *aclrecordproto.RawAclRecordWithId) (err error) {
-	_, err = a.recordBuilder.Unmarshall(rawRec)
-	if err != nil {
-		return
-	}
-	// TODO: change state and add "check" method for records
 	return
 }
 
@@ -171,7 +237,7 @@ func (a *aclList) Id() string {
 	return a.id
 }
 
-func (a *aclList) Root() *aclrecordproto.RawAclRecordWithId {
+func (a *aclList) Root() *consensusproto.RawRecordWithId {
 	return a.root
 }
 
@@ -196,14 +262,27 @@ func (a *aclList) Head() *AclRecord {
 	return a.records[len(a.records)-1]
 }
 
+func (a *aclList) HasHead(head string) bool {
+	_, exists := a.indexes[head]
+	return exists
+}
+
 func (a *aclList) Get(id string) (*AclRecord, error) {
 	recIdx, ok := a.indexes[id]
 	if !ok {
-		return nil, fmt.Errorf("no such record")
+		return nil, ErrNoSuchRecord
 	}
 	return a.records[recIdx], nil
 }
 
+func (a *aclList) GetIndex(idx int) (*AclRecord, error) {
+	// TODO: when we add snapshots we will have to monitor record num in snapshots
+	if idx < 0 || idx >= len(a.records) {
+		return nil, ErrNoSuchRecord
+	}
+	return a.records[idx], nil
+}
+
 func (a *aclList) Iterate(iterFunc IterFunc) {
 	for _, rec := range a.records {
 		if !iterFunc(rec) {
@@ -212,6 +291,39 @@ func (a *aclList) Iterate(iterFunc IterFunc) {
 	}
 }
 
+func (a *aclList) RecordsAfter(ctx context.Context, id string) (records []*consensusproto.RawRecordWithId, err error) {
+	recIdx, ok := a.indexes[id]
+	if !ok {
+		return nil, ErrNoSuchRecord
+	}
+	for i := recIdx + 1; i < len(a.records); i++ {
+		rawRec, err := a.storage.GetRawRecord(ctx, a.records[i].Id)
+		if err != nil {
+			return nil, err
+		}
+		records = append(records, rawRec)
+	}
+	return
+}
+
+func (a *aclList) RecordsBefore(ctx context.Context, headId string) (records []*consensusproto.RawRecordWithId, err error) {
+	if headId == "" {
+		headId = a.Head().Id
+	}
+	recIdx, ok := a.indexes[headId]
+	if !ok {
+		return nil, ErrNoSuchRecord
+	}
+	for i := 0; i <= recIdx; i++ {
+		rawRec, err := a.storage.GetRawRecord(ctx, a.records[i].Id)
+		if err != nil {
+			return nil, err
+		}
+		records = append(records, rawRec)
+	}
+	return
+}
+
 func (a *aclList) IterateFrom(startId string, iterFunc IterFunc) {
 	recIdx, ok := a.indexes[startId]
 	if !ok {
@@ -224,6 +336,21 @@ func (a *aclList) IterateFrom(startId string, iterFunc IterFunc) {
 	}
 }
 
-func (a *aclList) Close() (err error) {
+func (a *aclList) Close(ctx context.Context) (err error) {
 	return nil
 }
+
+func WrapAclRecord(rawRec *consensusproto.RawRecord) *consensusproto.RawRecordWithId {
+	payload, err := rawRec.Marshal()
+	if err != nil {
+		panic(err)
+	}
+	id, err := cidutil.NewCidFromBytes(payload)
+	if err != nil {
+		panic(err)
+	}
+	return &consensusproto.RawRecordWithId{
+		Payload: payload,
+		Id:      id,
+	}
+}

commonspace/object/acl/list/list_test.go

@@ -2,11 +2,98 @@ package list
 
 import (
 	"fmt"
-	"github.com/anyproto/any-sync/commonspace/object/accountdata"
-	"github.com/stretchr/testify/require"
 	"testing"
+
+	"github.com/anyproto/any-sync/commonspace/object/accountdata"
+	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/anyproto/any-sync/util/crypto"
+	"github.com/stretchr/testify/require"
 )
 
+type aclFixture struct {
+	ownerKeys   *accountdata.AccountKeys
+	accountKeys *accountdata.AccountKeys
+	ownerAcl    *aclList
+	accountAcl  *aclList
+	spaceId     string
+}
+
+func newFixture(t *testing.T) *aclFixture {
+	ownerKeys, err := accountdata.NewRandom()
+	require.NoError(t, err)
+	accountKeys, err := accountdata.NewRandom()
+	require.NoError(t, err)
+	spaceId := "spaceId"
+	ownerAcl, err := NewTestDerivedAcl(spaceId, ownerKeys)
+	require.NoError(t, err)
+	accountAcl, err := NewTestAclWithRoot(accountKeys, ownerAcl.Root())
+	require.NoError(t, err)
+	return &aclFixture{
+		ownerKeys:   ownerKeys,
+		accountKeys: accountKeys,
+		ownerAcl:    ownerAcl.(*aclList),
+		accountAcl:  accountAcl.(*aclList),
+		spaceId:     spaceId,
+	}
+}
+
+func (fx *aclFixture) addRec(t *testing.T, rec *consensusproto.RawRecordWithId) {
+	err := fx.ownerAcl.AddRawRecord(rec)
+	require.NoError(t, err)
+	err = fx.accountAcl.AddRawRecord(rec)
+	require.NoError(t, err)
+}
+
+func (fx *aclFixture) inviteAccount(t *testing.T, perms AclPermissions) {
+	var (
+		ownerAcl     = fx.ownerAcl
+		ownerState   = fx.ownerAcl.aclState
+		accountAcl   = fx.accountAcl
+		accountState = fx.accountAcl.aclState
+	)
+	// building invite
+	inv, err := ownerAcl.RecordBuilder().BuildInvite()
+	require.NoError(t, err)
+	inviteRec := WrapAclRecord(inv.InviteRec)
+	fx.addRec(t, inviteRec)
+
+	// building request join
+	requestJoin, err := accountAcl.RecordBuilder().BuildRequestJoin(RequestJoinPayload{
+		InviteRecordId: inviteRec.Id,
+		InviteKey:      inv.InviteKey,
+	})
+	require.NoError(t, err)
+	requestJoinRec := WrapAclRecord(requestJoin)
+	fx.addRec(t, requestJoinRec)
+
+	// building request accept
+	requestAccept, err := ownerAcl.RecordBuilder().BuildRequestAccept(RequestAcceptPayload{
+		RequestRecordId: requestJoinRec.Id,
+		Permissions:     perms,
+	})
+	require.NoError(t, err)
+	// validate
+	err = ownerAcl.ValidateRawRecord(requestAccept)
+	require.NoError(t, err)
+	requestAcceptRec := WrapAclRecord(requestAccept)
+	fx.addRec(t, requestAcceptRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey).CanWrite())
+	require.Equal(t, 0, len(ownerState.pendingRequests))
+	require.Equal(t, 0, len(accountState.pendingRequests))
+	require.True(t, accountState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, accountState.Permissions(accountState.pubKey).CanWrite())
+
+	_, err = ownerState.StateAtRecord(requestJoinRec.Id, accountState.pubKey)
+	require.Equal(t, ErrNoSuchAccount, err)
+	stateAtRec, err := ownerState.StateAtRecord(requestAcceptRec.Id, accountState.pubKey)
+	require.NoError(t, err)
+	require.True(t, stateAtRec.Permissions == perms)
+}
+
 func TestAclList_BuildRoot(t *testing.T) {
 	randomKeys, err := accountdata.NewRandom()
 	require.NoError(t, err)
@@ -14,3 +101,193 @@ func TestAclList_BuildRoot(t *testing.T) {
 	require.NoError(t, err)
 	fmt.Println(randomAcl.Id())
 }
+
+func TestAclList_InvitePipeline(t *testing.T) {
+	fx := newFixture(t)
+	fx.inviteAccount(t, AclPermissions(aclrecordproto.AclUserPermissions_Writer))
+}
+
+func TestAclList_InviteRevoke(t *testing.T) {
+	fx := newFixture(t)
+	var (
+		ownerState   = fx.ownerAcl.aclState
+		accountState = fx.accountAcl.aclState
+	)
+	// building invite
+	inv, err := fx.ownerAcl.RecordBuilder().BuildInvite()
+	require.NoError(t, err)
+	inviteRec := WrapAclRecord(inv.InviteRec)
+	fx.addRec(t, inviteRec)
+
+	// building invite revoke
+	inviteRevoke, err := fx.ownerAcl.RecordBuilder().BuildInviteRevoke(ownerState.lastRecordId)
+	require.NoError(t, err)
+	inviteRevokeRec := WrapAclRecord(inviteRevoke)
+	fx.addRec(t, inviteRevokeRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey).NoPermissions())
+	require.Empty(t, ownerState.inviteKeys)
+	require.Empty(t, accountState.inviteKeys)
+}
+
+func TestAclList_RequestDecline(t *testing.T) {
+	fx := newFixture(t)
+	var (
+		ownerAcl     = fx.ownerAcl
+		ownerState   = fx.ownerAcl.aclState
+		accountAcl   = fx.accountAcl
+		accountState = fx.accountAcl.aclState
+	)
+	// building invite
+	inv, err := ownerAcl.RecordBuilder().BuildInvite()
+	require.NoError(t, err)
+	inviteRec := WrapAclRecord(inv.InviteRec)
+	fx.addRec(t, inviteRec)
+
+	// building request join
+	requestJoin, err := accountAcl.RecordBuilder().BuildRequestJoin(RequestJoinPayload{
+		InviteRecordId: inviteRec.Id,
+		InviteKey:      inv.InviteKey,
+	})
+	require.NoError(t, err)
+	requestJoinRec := WrapAclRecord(requestJoin)
+	fx.addRec(t, requestJoinRec)
+
+	// building request decline
+	requestDecline, err := ownerAcl.RecordBuilder().BuildRequestDecline(ownerState.lastRecordId)
+	require.NoError(t, err)
+	requestDeclineRec := WrapAclRecord(requestDecline)
+	fx.addRec(t, requestDeclineRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey).NoPermissions())
+	require.Empty(t, ownerState.pendingRequests)
+	require.Empty(t, accountState.pendingRequests)
+}
+
+func TestAclList_Remove(t *testing.T) {
+	fx := newFixture(t)
+	var (
+		ownerState   = fx.ownerAcl.aclState
+		accountState = fx.accountAcl.aclState
+	)
+	fx.inviteAccount(t, AclPermissions(aclrecordproto.AclUserPermissions_Writer))
+
+	newReadKey := crypto.NewAES()
+	remove, err := fx.ownerAcl.RecordBuilder().BuildAccountRemove(AccountRemovePayload{
+		Identities: []crypto.PubKey{fx.accountKeys.SignKey.GetPublic()},
+		ReadKey:    newReadKey,
+	})
+	require.NoError(t, err)
+	removeRec := WrapAclRecord(remove)
+	fx.addRec(t, removeRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey).NoPermissions())
+	require.True(t, ownerState.userReadKeys[removeRec.Id].Equals(newReadKey))
+	require.NotNil(t, ownerState.userReadKeys[fx.ownerAcl.Id()])
+	require.Equal(t, 0, len(ownerState.pendingRequests))
+	require.Equal(t, 0, len(accountState.pendingRequests))
+	require.True(t, accountState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, accountState.Permissions(accountState.pubKey).NoPermissions())
+	require.Nil(t, accountState.userReadKeys[removeRec.Id])
+	require.NotNil(t, accountState.userReadKeys[fx.ownerAcl.Id()])
+}
+
+func TestAclList_ReadKeyChange(t *testing.T) {
+	fx := newFixture(t)
+	var (
+		ownerState   = fx.ownerAcl.aclState
+		accountState = fx.accountAcl.aclState
+	)
+	fx.inviteAccount(t, AclPermissions(aclrecordproto.AclUserPermissions_Admin))
+
+	newReadKey := crypto.NewAES()
+	readKeyChange, err := fx.ownerAcl.RecordBuilder().BuildReadKeyChange(newReadKey)
+	require.NoError(t, err)
+	readKeyRec := WrapAclRecord(readKeyChange)
+	fx.addRec(t, readKeyRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey).CanManageAccounts())
+	require.True(t, ownerState.userReadKeys[readKeyRec.Id].Equals(newReadKey))
+	require.True(t, accountState.userReadKeys[readKeyRec.Id].Equals(newReadKey))
+	require.NotNil(t, ownerState.userReadKeys[fx.ownerAcl.Id()])
+	require.NotNil(t, accountState.userReadKeys[fx.ownerAcl.Id()])
+	readKey, err := ownerState.CurrentReadKey()
+	require.NoError(t, err)
+	require.True(t, newReadKey.Equals(readKey))
+	require.Equal(t, 0, len(ownerState.pendingRequests))
+	require.Equal(t, 0, len(accountState.pendingRequests))
+}
+
+func TestAclList_PermissionChange(t *testing.T) {
+	fx := newFixture(t)
+	var (
+		ownerState   = fx.ownerAcl.aclState
+		accountState = fx.accountAcl.aclState
+	)
+	fx.inviteAccount(t, AclPermissions(aclrecordproto.AclUserPermissions_Admin))
+
+	permissionChange, err := fx.ownerAcl.RecordBuilder().BuildPermissionChange(PermissionChangePayload{
+		Identity:    fx.accountKeys.SignKey.GetPublic(),
+		Permissions: AclPermissions(aclrecordproto.AclUserPermissions_Writer),
+	})
+	require.NoError(t, err)
+	permissionChangeRec := WrapAclRecord(permissionChange)
+	fx.addRec(t, permissionChangeRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey) == AclPermissions(aclrecordproto.AclUserPermissions_Writer))
+	require.True(t, accountState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, accountState.Permissions(accountState.pubKey) == AclPermissions(aclrecordproto.AclUserPermissions_Writer))
+	require.NotNil(t, ownerState.userReadKeys[fx.ownerAcl.Id()])
+	require.NotNil(t, accountState.userReadKeys[fx.ownerAcl.Id()])
+	require.Equal(t, 0, len(ownerState.pendingRequests))
+	require.Equal(t, 0, len(accountState.pendingRequests))
+}
+
+func TestAclList_RequestRemove(t *testing.T) {
+	fx := newFixture(t)
+	var (
+		ownerState   = fx.ownerAcl.aclState
+		accountState = fx.accountAcl.aclState
+	)
+	fx.inviteAccount(t, AclPermissions(aclrecordproto.AclUserPermissions_Writer))
+
+	removeRequest, err := fx.accountAcl.RecordBuilder().BuildRequestRemove()
+	require.NoError(t, err)
+	removeRequestRec := WrapAclRecord(removeRequest)
+	fx.addRec(t, removeRequestRec)
+
+	recs := fx.accountAcl.AclState().RemoveRecords()
+	require.Len(t, recs, 1)
+	require.True(t, accountState.pubKey.Equals(recs[0].RequestIdentity))
+
+	newReadKey := crypto.NewAES()
+	remove, err := fx.ownerAcl.RecordBuilder().BuildAccountRemove(AccountRemovePayload{
+		Identities: []crypto.PubKey{recs[0].RequestIdentity},
+		ReadKey:    newReadKey,
+	})
+	require.NoError(t, err)
+	removeRec := WrapAclRecord(remove)
+	fx.addRec(t, removeRec)
+
+	// checking acl state
+	require.True(t, ownerState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, ownerState.Permissions(accountState.pubKey).NoPermissions())
+	require.True(t, ownerState.userReadKeys[removeRec.Id].Equals(newReadKey))
+	require.NotNil(t, ownerState.userReadKeys[fx.ownerAcl.Id()])
+	require.Equal(t, 0, len(ownerState.pendingRequests))
+	require.Equal(t, 0, len(accountState.pendingRequests))
+	require.True(t, accountState.Permissions(ownerState.pubKey).IsOwner())
+	require.True(t, accountState.Permissions(accountState.pubKey).NoPermissions())
+	require.Nil(t, accountState.userReadKeys[removeRec.Id])
+	require.NotNil(t, accountState.userReadKeys[fx.ownerAcl.Id()])
+}

commonspace/object/acl/list/listutils.go

@@ -2,13 +2,13 @@ package list
 
 import (
 	"github.com/anyproto/any-sync/commonspace/object/accountdata"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
 	"github.com/anyproto/any-sync/commonspace/object/acl/liststorage"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 	"github.com/anyproto/any-sync/util/crypto"
 )
 
 func NewTestDerivedAcl(spaceId string, keys *accountdata.AccountKeys) (AclList, error) {
-	builder := NewAclRecordBuilder("", crypto.NewKeyStorage())
+	builder := NewAclRecordBuilder("", crypto.NewKeyStorage(), keys, NoOpAcceptorVerifier{})
 	masterKey, _, err := crypto.GenerateRandomEd25519KeyPair()
 	if err != nil {
 		return nil, err
@@ -21,11 +21,21 @@ func NewTestDerivedAcl(spaceId string, keys *accountdata.AccountKeys) (AclList,
 	if err != nil {
 		return nil, err
 	}
-	st, err := liststorage.NewInMemoryAclListStorage(root.Id, []*aclrecordproto.RawAclRecordWithId{
+	st, err := liststorage.NewInMemoryAclListStorage(root.Id, []*consensusproto.RawRecordWithId{
 		root,
 	})
 	if err != nil {
 		return nil, err
 	}
-	return BuildAclListWithIdentity(keys, st)
+	return BuildAclListWithIdentity(keys, st, NoOpAcceptorVerifier{})
+}
+
+func NewTestAclWithRoot(keys *accountdata.AccountKeys, root *consensusproto.RawRecordWithId) (AclList, error) {
+	st, err := liststorage.NewInMemoryAclListStorage(root.Id, []*consensusproto.RawRecordWithId{
+		root,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return BuildAclListWithIdentity(keys, st, NoOpAcceptorVerifier{})
 }

commonspace/object/acl/list/mock_list/mock_list.go

@@ -5,12 +5,13 @@
 package mock_list
 
 import (
+	context "context"
 	reflect "reflect"
 
-	aclrecordproto "github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
 	list "github.com/anyproto/any-sync/commonspace/object/acl/list"
+	consensusproto "github.com/anyproto/any-sync/consensus/consensusproto"
 	crypto "github.com/anyproto/any-sync/util/crypto"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockAclList is a mock of AclList interface.
@@ -51,12 +52,11 @@ func (mr *MockAclListMockRecorder) AclState() *gomock.Call {
 }
 
 // AddRawRecord mocks base method.
-func (m *MockAclList) AddRawRecord(arg0 *aclrecordproto.RawAclRecordWithId) (bool, error) {
+func (m *MockAclList) AddRawRecord(arg0 *consensusproto.RawRecordWithId) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AddRawRecord", arg0)
-	ret0, _ := ret[0].(bool)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
+	ret0, _ := ret[0].(error)
+	return ret0
 }
 
 // AddRawRecord indicates an expected call of AddRawRecord.
@@ -65,18 +65,32 @@ func (mr *MockAclListMockRecorder) AddRawRecord(arg0 interface{}) *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddRawRecord", reflect.TypeOf((*MockAclList)(nil).AddRawRecord), arg0)
 }
 
-// Close mocks base method.
-func (m *MockAclList) Close() error {
+// AddRawRecords mocks base method.
+func (m *MockAclList) AddRawRecords(arg0 []*consensusproto.RawRecordWithId) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Close")
+	ret := m.ctrl.Call(m, "AddRawRecords", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddRawRecords indicates an expected call of AddRawRecords.
+func (mr *MockAclListMockRecorder) AddRawRecords(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddRawRecords", reflect.TypeOf((*MockAclList)(nil).AddRawRecords), arg0)
+}
+
+// Close mocks base method.
+func (m *MockAclList) Close(arg0 context.Context) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Close", arg0)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // Close indicates an expected call of Close.
-func (mr *MockAclListMockRecorder) Close() *gomock.Call {
+func (mr *MockAclListMockRecorder) Close(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockAclList)(nil).Close))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockAclList)(nil).Close), arg0)
 }
 
 // Get mocks base method.
@@ -94,6 +108,35 @@ func (mr *MockAclListMockRecorder) Get(arg0 interface{}) *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockAclList)(nil).Get), arg0)
 }
 
+// GetIndex mocks base method.
+func (m *MockAclList) GetIndex(arg0 int) (*list.AclRecord, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetIndex", arg0)
+	ret0, _ := ret[0].(*list.AclRecord)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetIndex indicates an expected call of GetIndex.
+func (mr *MockAclListMockRecorder) GetIndex(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetIndex", reflect.TypeOf((*MockAclList)(nil).GetIndex), arg0)
+}
+
+// HasHead mocks base method.
+func (m *MockAclList) HasHead(arg0 string) bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HasHead", arg0)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// HasHead indicates an expected call of HasHead.
+func (mr *MockAclListMockRecorder) HasHead(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HasHead", reflect.TypeOf((*MockAclList)(nil).HasHead), arg0)
+}
+
 // Head mocks base method.
 func (m *MockAclList) Head() *list.AclRecord {
 	m.ctrl.T.Helper()
@@ -211,6 +254,20 @@ func (mr *MockAclListMockRecorder) RUnlock() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RUnlock", reflect.TypeOf((*MockAclList)(nil).RUnlock))
 }
 
+// RecordBuilder mocks base method.
+func (m *MockAclList) RecordBuilder() list.AclRecordBuilder {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RecordBuilder")
+	ret0, _ := ret[0].(list.AclRecordBuilder)
+	return ret0
+}
+
+// RecordBuilder indicates an expected call of RecordBuilder.
+func (mr *MockAclListMockRecorder) RecordBuilder() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RecordBuilder", reflect.TypeOf((*MockAclList)(nil).RecordBuilder))
+}
+
 // Records mocks base method.
 func (m *MockAclList) Records() []*list.AclRecord {
 	m.ctrl.T.Helper()
@@ -225,11 +282,41 @@ func (mr *MockAclListMockRecorder) Records() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Records", reflect.TypeOf((*MockAclList)(nil).Records))
 }
 
+// RecordsAfter mocks base method.
+func (m *MockAclList) RecordsAfter(arg0 context.Context, arg1 string) ([]*consensusproto.RawRecordWithId, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RecordsAfter", arg0, arg1)
+	ret0, _ := ret[0].([]*consensusproto.RawRecordWithId)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// RecordsAfter indicates an expected call of RecordsAfter.
+func (mr *MockAclListMockRecorder) RecordsAfter(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RecordsAfter", reflect.TypeOf((*MockAclList)(nil).RecordsAfter), arg0, arg1)
+}
+
+// RecordsBefore mocks base method.
+func (m *MockAclList) RecordsBefore(arg0 context.Context, arg1 string) ([]*consensusproto.RawRecordWithId, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RecordsBefore", arg0, arg1)
+	ret0, _ := ret[0].([]*consensusproto.RawRecordWithId)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// RecordsBefore indicates an expected call of RecordsBefore.
+func (mr *MockAclListMockRecorder) RecordsBefore(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RecordsBefore", reflect.TypeOf((*MockAclList)(nil).RecordsBefore), arg0, arg1)
+}
+
 // Root mocks base method.
-func (m *MockAclList) Root() *aclrecordproto.RawAclRecordWithId {
+func (m *MockAclList) Root() *consensusproto.RawRecordWithId {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Root")
-	ret0, _ := ret[0].(*aclrecordproto.RawAclRecordWithId)
+	ret0, _ := ret[0].(*consensusproto.RawRecordWithId)
 	return ret0
 }
 
@@ -250,3 +337,17 @@ func (mr *MockAclListMockRecorder) Unlock() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Unlock", reflect.TypeOf((*MockAclList)(nil).Unlock))
 }
+
+// ValidateRawRecord mocks base method.
+func (m *MockAclList) ValidateRawRecord(arg0 *consensusproto.RawRecord) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ValidateRawRecord", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// ValidateRawRecord indicates an expected call of ValidateRawRecord.
+func (mr *MockAclListMockRecorder) ValidateRawRecord(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ValidateRawRecord", reflect.TypeOf((*MockAclList)(nil).ValidateRawRecord), arg0)
+}

commonspace/object/acl/list/models.go

@@ -8,7 +8,6 @@ import (
 type AclRecord struct {
 	Id        string
 	PrevId    string
-	ReadKeyId string
 	Timestamp int64
 	Data      []byte
 	Identity  crypto.PubKey
@@ -16,7 +15,55 @@ type AclRecord struct {
 	Signature []byte
 }
 
-type AclUserState struct {
-	PubKey      crypto.PubKey
-	Permissions aclrecordproto.AclUserPermissions
+type RequestRecord struct {
+	RequestIdentity crypto.PubKey
+	RequestMetadata []byte
+	Type            RequestType
+}
+
+type AclUserState struct {
+	PubKey          crypto.PubKey
+	Permissions     AclPermissions
+	RequestMetadata []byte
+}
+
+type RequestType int
+
+const (
+	RequestTypeRemove RequestType = iota
+	RequestTypeJoin
+)
+
+type AclPermissions aclrecordproto.AclUserPermissions
+
+func (p AclPermissions) NoPermissions() bool {
+	return aclrecordproto.AclUserPermissions(p) == aclrecordproto.AclUserPermissions_None
+}
+
+func (p AclPermissions) IsOwner() bool {
+	return aclrecordproto.AclUserPermissions(p) == aclrecordproto.AclUserPermissions_Owner
+}
+
+func (p AclPermissions) CanWrite() bool {
+	switch aclrecordproto.AclUserPermissions(p) {
+	case aclrecordproto.AclUserPermissions_Admin:
+		return true
+	case aclrecordproto.AclUserPermissions_Writer:
+		return true
+	case aclrecordproto.AclUserPermissions_Owner:
+		return true
+	default:
+		return false
+	}
+}
+
+func (p AclPermissions) CanManageAccounts() bool {
+	switch aclrecordproto.AclUserPermissions(p) {
+	case aclrecordproto.AclUserPermissions_Admin:
+		return true
+	case aclrecordproto.AclUserPermissions_Owner:
+		return true
+	default:
+		return false
+	}
 }

commonspace/object/acl/list/validator.go

@@ -0,0 +1,218 @@
+package list
+
+import (
+	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"github.com/anyproto/any-sync/util/crypto"
+)
+
+type ContentValidator interface {
+	ValidateAclRecordContents(ch *AclRecord) (err error)
+	ValidatePermissionChange(ch *aclrecordproto.AclAccountPermissionChange, authorIdentity crypto.PubKey) (err error)
+	ValidateInvite(ch *aclrecordproto.AclAccountInvite, authorIdentity crypto.PubKey) (err error)
+	ValidateInviteRevoke(ch *aclrecordproto.AclAccountInviteRevoke, authorIdentity crypto.PubKey) (err error)
+	ValidateRequestJoin(ch *aclrecordproto.AclAccountRequestJoin, authorIdentity crypto.PubKey) (err error)
+	ValidateRequestAccept(ch *aclrecordproto.AclAccountRequestAccept, authorIdentity crypto.PubKey) (err error)
+	ValidateRequestDecline(ch *aclrecordproto.AclAccountRequestDecline, authorIdentity crypto.PubKey) (err error)
+	ValidateAccountRemove(ch *aclrecordproto.AclAccountRemove, authorIdentity crypto.PubKey) (err error)
+	ValidateRequestRemove(ch *aclrecordproto.AclAccountRequestRemove, authorIdentity crypto.PubKey) (err error)
+	ValidateReadKeyChange(ch *aclrecordproto.AclReadKeyChange, authorIdentity crypto.PubKey) (err error)
+}
+
+type contentValidator struct {
+	keyStore crypto.KeyStorage
+	aclState *AclState
+}
+
+func (c *contentValidator) ValidateAclRecordContents(ch *AclRecord) (err error) {
+	if ch.PrevId != c.aclState.lastRecordId {
+		return ErrIncorrectRecordSequence
+	}
+	aclData := ch.Model.(*aclrecordproto.AclData)
+	for _, content := range aclData.AclContent {
+		err = c.validateAclRecordContent(content, ch.Identity)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+func (c *contentValidator) validateAclRecordContent(ch *aclrecordproto.AclContentValue, authorIdentity crypto.PubKey) (err error) {
+	switch {
+	case ch.GetPermissionChange() != nil:
+		return c.ValidatePermissionChange(ch.GetPermissionChange(), authorIdentity)
+	case ch.GetInvite() != nil:
+		return c.ValidateInvite(ch.GetInvite(), authorIdentity)
+	case ch.GetInviteRevoke() != nil:
+		return c.ValidateInviteRevoke(ch.GetInviteRevoke(), authorIdentity)
+	case ch.GetRequestJoin() != nil:
+		return c.ValidateRequestJoin(ch.GetRequestJoin(), authorIdentity)
+	case ch.GetRequestAccept() != nil:
+		return c.ValidateRequestAccept(ch.GetRequestAccept(), authorIdentity)
+	case ch.GetRequestDecline() != nil:
+		return c.ValidateRequestDecline(ch.GetRequestDecline(), authorIdentity)
+	case ch.GetAccountRemove() != nil:
+		return c.ValidateAccountRemove(ch.GetAccountRemove(), authorIdentity)
+	case ch.GetAccountRequestRemove() != nil:
+		return c.ValidateRequestRemove(ch.GetAccountRequestRemove(), authorIdentity)
+	case ch.GetReadKeyChange() != nil:
+		return c.ValidateReadKeyChange(ch.GetReadKeyChange(), authorIdentity)
+	default:
+		return ErrUnexpectedContentType
+	}
+}
+
+func (c *contentValidator) ValidatePermissionChange(ch *aclrecordproto.AclAccountPermissionChange, authorIdentity crypto.PubKey) (err error) {
+	if !c.aclState.Permissions(authorIdentity).CanManageAccounts() {
+		return ErrInsufficientPermissions
+	}
+	chIdentity, err := c.keyStore.PubKeyFromProto(ch.Identity)
+	if err != nil {
+		return err
+	}
+	_, exists := c.aclState.userStates[mapKeyFromPubKey(chIdentity)]
+	if !exists {
+		return ErrNoSuchAccount
+	}
+	return
+}
+
+func (c *contentValidator) ValidateInvite(ch *aclrecordproto.AclAccountInvite, authorIdentity crypto.PubKey) (err error) {
+	if !c.aclState.Permissions(authorIdentity).CanManageAccounts() {
+		return ErrInsufficientPermissions
+	}
+	_, err = c.keyStore.PubKeyFromProto(ch.InviteKey)
+	return
+}
+
+func (c *contentValidator) ValidateInviteRevoke(ch *aclrecordproto.AclAccountInviteRevoke, authorIdentity crypto.PubKey) (err error) {
+	if !c.aclState.Permissions(authorIdentity).CanManageAccounts() {
+		return ErrInsufficientPermissions
+	}
+	_, exists := c.aclState.inviteKeys[ch.InviteRecordId]
+	if !exists {
+		return ErrNoSuchInvite
+	}
+	return
+}
+
+func (c *contentValidator) ValidateRequestJoin(ch *aclrecordproto.AclAccountRequestJoin, authorIdentity crypto.PubKey) (err error) {
+	inviteKey, exists := c.aclState.inviteKeys[ch.InviteRecordId]
+	if !exists {
+		return ErrNoSuchInvite
+	}
+	inviteIdentity, err := c.keyStore.PubKeyFromProto(ch.InviteIdentity)
+	if err != nil {
+		return
+	}
+	if _, exists := c.aclState.pendingRequests[mapKeyFromPubKey(inviteIdentity)]; exists {
+		return ErrPendingRequest
+	}
+	if !authorIdentity.Equals(inviteIdentity) {
+		return ErrIncorrectIdentity
+	}
+	rawInviteIdentity, err := inviteIdentity.Raw()
+	if err != nil {
+		return err
+	}
+	ok, err := inviteKey.Verify(rawInviteIdentity, ch.InviteIdentitySignature)
+	if err != nil {
+		return ErrInvalidSignature
+	}
+	if !ok {
+		return ErrInvalidSignature
+	}
+	return
+}
+
+func (c *contentValidator) ValidateRequestAccept(ch *aclrecordproto.AclAccountRequestAccept, authorIdentity crypto.PubKey) (err error) {
+	if !c.aclState.Permissions(authorIdentity).CanManageAccounts() {
+		return ErrInsufficientPermissions
+	}
+	record, exists := c.aclState.requestRecords[ch.RequestRecordId]
+	if !exists {
+		return ErrNoSuchRequest
+	}
+	acceptIdentity, err := c.keyStore.PubKeyFromProto(ch.Identity)
+	if err != nil {
+		return
+	}
+	if !acceptIdentity.Equals(record.RequestIdentity) {
+		return ErrIncorrectIdentity
+	}
+	if ch.Permissions == aclrecordproto.AclUserPermissions_Owner {
+		return ErrInsufficientPermissions
+	}
+	return
+}
+
+func (c *contentValidator) ValidateRequestDecline(ch *aclrecordproto.AclAccountRequestDecline, authorIdentity crypto.PubKey) (err error) {
+	if !c.aclState.Permissions(authorIdentity).CanManageAccounts() {
+		return ErrInsufficientPermissions
+	}
+	_, exists := c.aclState.requestRecords[ch.RequestRecordId]
+	if !exists {
+		return ErrNoSuchRequest
+	}
+	return
+}
+
+func (c *contentValidator) ValidateAccountRemove(ch *aclrecordproto.AclAccountRemove, authorIdentity crypto.PubKey) (err error) {
+	if !c.aclState.Permissions(authorIdentity).CanManageAccounts() {
+		return ErrInsufficientPermissions
+	}
+	seenIdentities := map[string]struct{}{}
+	for _, rawIdentity := range ch.Identities {
+		identity, err := c.keyStore.PubKeyFromProto(rawIdentity)
+		if err != nil {
+			return err
+		}
+		if identity.Equals(authorIdentity) {
+			return ErrInsufficientPermissions
+		}
+		permissions := c.aclState.Permissions(identity)
+		if permissions.NoPermissions() {
+			return ErrNoSuchAccount
+		}
+		if permissions.IsOwner() {
+			return ErrInsufficientPermissions
+		}
+		idKey := mapKeyFromPubKey(identity)
+		if _, exists := seenIdentities[idKey]; exists {
+			return ErrDuplicateAccounts
+		}
+		seenIdentities[mapKeyFromPubKey(identity)] = struct{}{}
+	}
+	return c.validateAccountReadKeys(ch.AccountKeys, len(c.aclState.userStates)-len(ch.Identities))
+}
+
+func (c *contentValidator) ValidateRequestRemove(ch *aclrecordproto.AclAccountRequestRemove, authorIdentity crypto.PubKey) (err error) {
+	if c.aclState.Permissions(authorIdentity).NoPermissions() {
+		return ErrInsufficientPermissions
+	}
+	if _, exists := c.aclState.pendingRequests[mapKeyFromPubKey(authorIdentity)]; exists {
+		return ErrPendingRequest
+	}
+	return
+}
+
+func (c *contentValidator) ValidateReadKeyChange(ch *aclrecordproto.AclReadKeyChange, authorIdentity crypto.PubKey) (err error) {
+	return c.validateAccountReadKeys(ch.AccountKeys, len(c.aclState.userStates))
+}
+
+func (c *contentValidator) validateAccountReadKeys(accountKeys []*aclrecordproto.AclEncryptedReadKey, usersNum int) (err error) {
+	if len(accountKeys) != usersNum {
+		return ErrIncorrectNumberOfAccounts
+	}
+	for _, encKeys := range accountKeys {
+		identity, err := c.keyStore.PubKeyFromProto(encKeys.Identity)
+		if err != nil {
+			return err
+		}
+		_, exists := c.aclState.userStates[mapKeyFromPubKey(identity)]
+		if !exists {
+			return ErrNoSuchAccount
+		}
+	}
+	return
+}

commonspace/object/acl/liststorage/inmemory.go

@@ -3,24 +3,26 @@ package liststorage
 import (
 	"context"
 	"fmt"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+
 	"sync"
 )
 
 type inMemoryAclListStorage struct {
 	id      string
-	root    *aclrecordproto.RawAclRecordWithId
+	root    *consensusproto.RawRecordWithId
 	head    string
-	records map[string]*aclrecordproto.RawAclRecordWithId
+	records map[string]*consensusproto.RawRecordWithId
 
 	sync.RWMutex
 }
 
 func NewInMemoryAclListStorage(
 	id string,
-	records []*aclrecordproto.RawAclRecordWithId) (ListStorage, error) {
+	records []*consensusproto.RawRecordWithId) (ListStorage, error) {
 
-	allRecords := make(map[string]*aclrecordproto.RawAclRecordWithId)
+	allRecords := make(map[string]*consensusproto.RawRecordWithId)
 	for _, ch := range records {
 		allRecords[ch.Id] = ch
 	}
@@ -41,7 +43,7 @@ func (t *inMemoryAclListStorage) Id() string {
 	return t.id
 }
 
-func (t *inMemoryAclListStorage) Root() (*aclrecordproto.RawAclRecordWithId, error) {
+func (t *inMemoryAclListStorage) Root() (*consensusproto.RawRecordWithId, error) {
 	t.RLock()
 	defer t.RUnlock()
 	return t.root, nil
@@ -60,7 +62,7 @@ func (t *inMemoryAclListStorage) SetHead(head string) error {
 	return nil
 }
 
-func (t *inMemoryAclListStorage) AddRawRecord(ctx context.Context, record *aclrecordproto.RawAclRecordWithId) error {
+func (t *inMemoryAclListStorage) AddRawRecord(ctx context.Context, record *consensusproto.RawRecordWithId) error {
 	t.Lock()
 	defer t.Unlock()
 	// TODO: better to do deep copy
@@ -68,7 +70,7 @@ func (t *inMemoryAclListStorage) AddRawRecord(ctx context.Context, record *aclre
 	return nil
 }
 
-func (t *inMemoryAclListStorage) GetRawRecord(ctx context.Context, recordId string) (*aclrecordproto.RawAclRecordWithId, error) {
+func (t *inMemoryAclListStorage) GetRawRecord(ctx context.Context, recordId string) (*consensusproto.RawRecordWithId, error) {
 	t.RLock()
 	defer t.RUnlock()
 	if res, exists := t.records[recordId]; exists {

commonspace/object/acl/liststorage/liststorage.go

@@ -4,7 +4,8 @@ package liststorage
 import (
 	"context"
 	"errors"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 )
 
 var (
@@ -14,15 +15,15 @@ var (
 )
 
 type Exporter interface {
-	ListStorage(root *aclrecordproto.RawAclRecordWithId) (ListStorage, error)
+	ListStorage(root *consensusproto.RawRecordWithId) (ListStorage, error)
 }
 
 type ListStorage interface {
 	Id() string
-	Root() (*aclrecordproto.RawAclRecordWithId, error)
+	Root() (*consensusproto.RawRecordWithId, error)
 	Head() (string, error)
 	SetHead(headId string) error
 
-	GetRawRecord(ctx context.Context, id string) (*aclrecordproto.RawAclRecordWithId, error)
-	AddRawRecord(ctx context.Context, rec *aclrecordproto.RawAclRecordWithId) error
+	GetRawRecord(ctx context.Context, id string) (*consensusproto.RawRecordWithId, error)
+	AddRawRecord(ctx context.Context, rec *consensusproto.RawRecordWithId) error
 }

commonspace/object/acl/liststorage/mock_liststorage/mock_liststorage.go

@@ -8,8 +8,8 @@ import (
 	context "context"
 	reflect "reflect"
 
-	aclrecordproto "github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
-	gomock "github.com/golang/mock/gomock"
+	consensusproto "github.com/anyproto/any-sync/consensus/consensusproto"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockListStorage is a mock of ListStorage interface.
@@ -36,7 +36,7 @@ func (m *MockListStorage) EXPECT() *MockListStorageMockRecorder {
 }
 
 // AddRawRecord mocks base method.
-func (m *MockListStorage) AddRawRecord(arg0 context.Context, arg1 *aclrecordproto.RawAclRecordWithId) error {
+func (m *MockListStorage) AddRawRecord(arg0 context.Context, arg1 *consensusproto.RawRecordWithId) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AddRawRecord", arg0, arg1)
 	ret0, _ := ret[0].(error)
@@ -50,10 +50,10 @@ func (mr *MockListStorageMockRecorder) AddRawRecord(arg0, arg1 interface{}) *gom
 }
 
 // GetRawRecord mocks base method.
-func (m *MockListStorage) GetRawRecord(arg0 context.Context, arg1 string) (*aclrecordproto.RawAclRecordWithId, error) {
+func (m *MockListStorage) GetRawRecord(arg0 context.Context, arg1 string) (*consensusproto.RawRecordWithId, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetRawRecord", arg0, arg1)
-	ret0, _ := ret[0].(*aclrecordproto.RawAclRecordWithId)
+	ret0, _ := ret[0].(*consensusproto.RawRecordWithId)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
@@ -94,10 +94,10 @@ func (mr *MockListStorageMockRecorder) Id() *gomock.Call {
 }
 
 // Root mocks base method.
-func (m *MockListStorage) Root() (*aclrecordproto.RawAclRecordWithId, error) {
+func (m *MockListStorage) Root() (*consensusproto.RawRecordWithId, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Root")
-	ret0, _ := ret[0].(*aclrecordproto.RawAclRecordWithId)
+	ret0, _ := ret[0].(*consensusproto.RawRecordWithId)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }

commonspace/object/acl/syncacl/aclsyncprotocol.go

@@ -0,0 +1,120 @@
+//go:generate mockgen -destination mock_syncacl/mock_syncacl.go github.com/anyproto/any-sync/commonspace/object/acl/syncacl SyncAcl,SyncClient,RequestFactory,AclSyncProtocol
+package syncacl
+
+import (
+	"context"
+
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"go.uber.org/zap"
+)
+
+type AclSyncProtocol interface {
+	HeadUpdate(ctx context.Context, senderId string, update *consensusproto.LogHeadUpdate) (request *consensusproto.LogSyncMessage, err error)
+	FullSyncRequest(ctx context.Context, senderId string, request *consensusproto.LogFullSyncRequest) (response *consensusproto.LogSyncMessage, err error)
+	FullSyncResponse(ctx context.Context, senderId string, response *consensusproto.LogFullSyncResponse) (err error)
+}
+
+type aclSyncProtocol struct {
+	log        logger.CtxLogger
+	spaceId    string
+	aclList    list.AclList
+	reqFactory RequestFactory
+}
+
+func (a *aclSyncProtocol) HeadUpdate(ctx context.Context, senderId string, update *consensusproto.LogHeadUpdate) (request *consensusproto.LogSyncMessage, err error) {
+	isEmptyUpdate := len(update.Records) == 0
+	log := a.log.With(
+		zap.String("senderId", senderId),
+		zap.String("update head", update.Head),
+		zap.Int("len(update records)", len(update.Records)))
+	log.DebugCtx(ctx, "received acl head update message")
+
+	defer func() {
+		if err != nil {
+			log.ErrorCtx(ctx, "acl head update finished with error", zap.Error(err))
+		} else if request != nil {
+			cnt := request.Content.GetFullSyncRequest()
+			log.DebugCtx(ctx, "returning acl full sync request", zap.String("request head", cnt.Head))
+		} else {
+			if !isEmptyUpdate {
+				log.DebugCtx(ctx, "acl head update finished correctly")
+			}
+		}
+	}()
+	if isEmptyUpdate {
+		headEquals := a.aclList.Head().Id == update.Head
+		log.DebugCtx(ctx, "is empty acl head update", zap.Bool("headEquals", headEquals))
+		if headEquals {
+			return
+		}
+		return a.reqFactory.CreateFullSyncRequest(a.aclList, update.Head)
+	}
+	if a.aclList.HasHead(update.Head) {
+		return
+	}
+	err = a.aclList.AddRawRecords(update.Records)
+	if err == list.ErrIncorrectRecordSequence {
+		return a.reqFactory.CreateFullSyncRequest(a.aclList, update.Head)
+	}
+	return
+}
+
+func (a *aclSyncProtocol) FullSyncRequest(ctx context.Context, senderId string, request *consensusproto.LogFullSyncRequest) (response *consensusproto.LogSyncMessage, err error) {
+	log := a.log.With(
+		zap.String("senderId", senderId),
+		zap.String("request head", request.Head),
+		zap.Int("len(request records)", len(request.Records)))
+	log.DebugCtx(ctx, "received acl full sync request message")
+
+	defer func() {
+		if err != nil {
+			log.ErrorCtx(ctx, "acl full sync request finished with error", zap.Error(err))
+		} else if response != nil {
+			cnt := response.Content.GetFullSyncResponse()
+			log.DebugCtx(ctx, "acl full sync response sent", zap.String("response head", cnt.Head), zap.Int("len(response records)", len(cnt.Records)))
+		}
+	}()
+	if !a.aclList.HasHead(request.Head) {
+		if len(request.Records) > 0 {
+			// in this case we can try to add some records
+			err = a.aclList.AddRawRecords(request.Records)
+			if err != nil {
+				return
+			}
+		} else {
+			// here it is impossible for us to do anything, we can't return records after head as defined in request, because we don't have it
+			return nil, list.ErrIncorrectRecordSequence
+		}
+	}
+	return a.reqFactory.CreateFullSyncResponse(a.aclList, request.Head)
+}
+
+func (a *aclSyncProtocol) FullSyncResponse(ctx context.Context, senderId string, response *consensusproto.LogFullSyncResponse) (err error) {
+	log := a.log.With(
+		zap.String("senderId", senderId),
+		zap.String("response head", response.Head),
+		zap.Int("len(response records)", len(response.Records)))
+	log.DebugCtx(ctx, "received acl full sync response message")
+	defer func() {
+		if err != nil {
+			log.ErrorCtx(ctx, "acl full sync response failed", zap.Error(err))
+		} else {
+			log.DebugCtx(ctx, "acl full sync response succeeded")
+		}
+	}()
+	if a.aclList.HasHead(response.Head) {
+		return
+	}
+	return a.aclList.AddRawRecords(response.Records)
+}
+
+func newAclSyncProtocol(spaceId string, aclList list.AclList, reqFactory RequestFactory) *aclSyncProtocol {
+	return &aclSyncProtocol{
+		log:        log.With(zap.String("spaceId", spaceId), zap.String("aclId", aclList.Id())),
+		spaceId:    spaceId,
+		aclList:    aclList,
+		reqFactory: reqFactory,
+	}
+}

commonspace/object/acl/syncacl/aclsyncprotocol_test.go

@@ -0,0 +1,213 @@
+package syncacl
+
+import (
+	"context"
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list/mock_list"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl/mock_syncacl"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+	"testing"
+)
+
+type aclSyncProtocolFixture struct {
+	log          logger.CtxLogger
+	spaceId      string
+	senderId     string
+	aclId        string
+	aclMock      *mock_list.MockAclList
+	reqFactory   *mock_syncacl.MockRequestFactory
+	ctrl         *gomock.Controller
+	syncProtocol AclSyncProtocol
+}
+
+func newSyncProtocolFixture(t *testing.T) *aclSyncProtocolFixture {
+	ctrl := gomock.NewController(t)
+	aclList := mock_list.NewMockAclList(ctrl)
+	spaceId := "spaceId"
+	reqFactory := mock_syncacl.NewMockRequestFactory(ctrl)
+	aclList.EXPECT().Id().Return("aclId")
+	syncProtocol := newAclSyncProtocol(spaceId, aclList, reqFactory)
+	return &aclSyncProtocolFixture{
+		log:          log,
+		spaceId:      spaceId,
+		senderId:     "senderId",
+		aclId:        "aclId",
+		aclMock:      aclList,
+		reqFactory:   reqFactory,
+		ctrl:         ctrl,
+		syncProtocol: syncProtocol,
+	}
+}
+
+func (fx *aclSyncProtocolFixture) stop() {
+	fx.ctrl.Finish()
+}
+
+func TestHeadUpdate(t *testing.T) {
+	ctx := context.Background()
+	fullRequest := &consensusproto.LogSyncMessage{
+		Content: &consensusproto.LogSyncContentValue{
+			Value: &consensusproto.LogSyncContentValue_FullSyncRequest{
+				FullSyncRequest: &consensusproto.LogFullSyncRequest{},
+			},
+		},
+	}
+	t.Run("head update non empty all heads added", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(false)
+		fx.aclMock.EXPECT().AddRawRecords(headUpdate.Records).Return(nil)
+		req, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.Nil(t, req)
+		require.NoError(t, err)
+	})
+	t.Run("head update results in full request", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(false)
+		fx.aclMock.EXPECT().AddRawRecords(headUpdate.Records).Return(list.ErrIncorrectRecordSequence)
+		fx.reqFactory.EXPECT().CreateFullSyncRequest(fx.aclMock, headUpdate.Head).Return(fullRequest, nil)
+		req, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.Equal(t, fullRequest, req)
+		require.NoError(t, err)
+	})
+	t.Run("head update old heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(true)
+		req, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.Nil(t, req)
+		require.NoError(t, err)
+	})
+	t.Run("head update empty equals", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head: "h1",
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().Head().Return(&list.AclRecord{Id: "h1"})
+		req, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.Nil(t, req)
+		require.NoError(t, err)
+	})
+	t.Run("head update empty results in full request", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head: "h1",
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().Head().Return(&list.AclRecord{Id: "h2"})
+		fx.reqFactory.EXPECT().CreateFullSyncRequest(fx.aclMock, headUpdate.Head).Return(fullRequest, nil)
+		req, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.Equal(t, fullRequest, req)
+		require.NoError(t, err)
+	})
+}
+
+func TestFullSyncRequest(t *testing.T) {
+	ctx := context.Background()
+	fullResponse := &consensusproto.LogSyncMessage{
+		Content: &consensusproto.LogSyncContentValue{
+			Value: &consensusproto.LogSyncContentValue_FullSyncResponse{
+				FullSyncResponse: &consensusproto.LogFullSyncResponse{},
+			},
+		},
+	}
+	t.Run("full sync request non empty all heads added", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullRequest := &consensusproto.LogFullSyncRequest{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(false)
+		fx.aclMock.EXPECT().AddRawRecords(fullRequest.Records).Return(nil)
+		fx.reqFactory.EXPECT().CreateFullSyncResponse(fx.aclMock, fullRequest.Head).Return(fullResponse, nil)
+		resp, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullRequest)
+		require.Equal(t, fullResponse, resp)
+		require.NoError(t, err)
+	})
+	t.Run("full sync request non empty head exists", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullRequest := &consensusproto.LogFullSyncRequest{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(true)
+		fx.reqFactory.EXPECT().CreateFullSyncResponse(fx.aclMock, fullRequest.Head).Return(fullResponse, nil)
+		resp, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullRequest)
+		require.Equal(t, fullResponse, resp)
+		require.NoError(t, err)
+	})
+	t.Run("full sync request empty head not exists", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		fullRequest := &consensusproto.LogFullSyncRequest{
+			Head: "h1",
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(false)
+		resp, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullRequest)
+		require.Nil(t, resp)
+		require.Error(t, list.ErrIncorrectRecordSequence, err)
+	})
+}
+
+func TestFullSyncResponse(t *testing.T) {
+	ctx := context.Background()
+	t.Run("full sync response no heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullResponse := &consensusproto.LogFullSyncResponse{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(false)
+		fx.aclMock.EXPECT().AddRawRecords(fullResponse.Records).Return(nil)
+		err := fx.syncProtocol.FullSyncResponse(ctx, fx.senderId, fullResponse)
+		require.NoError(t, err)
+	})
+	t.Run("full sync response has heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullResponse := &consensusproto.LogFullSyncResponse{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().HasHead("h1").Return(true)
+		err := fx.syncProtocol.FullSyncResponse(ctx, fx.senderId, fullResponse)
+		require.NoError(t, err)
+	})
+}

commonspace/object/acl/syncacl/headupdater/headupdater.go

@@ -0,0 +1,5 @@
+package headupdater
+
+type HeadUpdater interface {
+	UpdateHeads(id string, heads []string)
+}

commonspace/object/acl/syncacl/mock_syncacl/mock_syncacl.go

@@ -0,0 +1,709 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/anyproto/any-sync/commonspace/object/acl/syncacl (interfaces: SyncAcl,SyncClient,RequestFactory,AclSyncProtocol)
+
+// Package mock_syncacl is a generated GoMock package.
+package mock_syncacl
+
+import (
+	context "context"
+	reflect "reflect"
+
+	app "github.com/anyproto/any-sync/app"
+	list "github.com/anyproto/any-sync/commonspace/object/acl/list"
+	headupdater "github.com/anyproto/any-sync/commonspace/object/acl/syncacl/headupdater"
+	spacesyncproto "github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	consensusproto "github.com/anyproto/any-sync/consensus/consensusproto"
+	crypto "github.com/anyproto/any-sync/util/crypto"
+	gomock "go.uber.org/mock/gomock"
+)
+
+// MockSyncAcl is a mock of SyncAcl interface.
+type MockSyncAcl struct {
+	ctrl     *gomock.Controller
+	recorder *MockSyncAclMockRecorder
+}
+
+// MockSyncAclMockRecorder is the mock recorder for MockSyncAcl.
+type MockSyncAclMockRecorder struct {
+	mock *MockSyncAcl
+}
+
+// NewMockSyncAcl creates a new mock instance.
+func NewMockSyncAcl(ctrl *gomock.Controller) *MockSyncAcl {
+	mock := &MockSyncAcl{ctrl: ctrl}
+	mock.recorder = &MockSyncAclMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockSyncAcl) EXPECT() *MockSyncAclMockRecorder {
+	return m.recorder
+}
+
+// AclState mocks base method.
+func (m *MockSyncAcl) AclState() *list.AclState {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AclState")
+	ret0, _ := ret[0].(*list.AclState)
+	return ret0
+}
+
+// AclState indicates an expected call of AclState.
+func (mr *MockSyncAclMockRecorder) AclState() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AclState", reflect.TypeOf((*MockSyncAcl)(nil).AclState))
+}
+
+// AddRawRecord mocks base method.
+func (m *MockSyncAcl) AddRawRecord(arg0 *consensusproto.RawRecordWithId) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AddRawRecord", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddRawRecord indicates an expected call of AddRawRecord.
+func (mr *MockSyncAclMockRecorder) AddRawRecord(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddRawRecord", reflect.TypeOf((*MockSyncAcl)(nil).AddRawRecord), arg0)
+}
+
+// AddRawRecords mocks base method.
+func (m *MockSyncAcl) AddRawRecords(arg0 []*consensusproto.RawRecordWithId) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AddRawRecords", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// AddRawRecords indicates an expected call of AddRawRecords.
+func (mr *MockSyncAclMockRecorder) AddRawRecords(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddRawRecords", reflect.TypeOf((*MockSyncAcl)(nil).AddRawRecords), arg0)
+}
+
+// Close mocks base method.
+func (m *MockSyncAcl) Close(arg0 context.Context) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Close", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Close indicates an expected call of Close.
+func (mr *MockSyncAclMockRecorder) Close(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockSyncAcl)(nil).Close), arg0)
+}
+
+// Get mocks base method.
+func (m *MockSyncAcl) Get(arg0 string) (*list.AclRecord, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", arg0)
+	ret0, _ := ret[0].(*list.AclRecord)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get.
+func (mr *MockSyncAclMockRecorder) Get(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockSyncAcl)(nil).Get), arg0)
+}
+
+// GetIndex mocks base method.
+func (m *MockSyncAcl) GetIndex(arg0 int) (*list.AclRecord, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetIndex", arg0)
+	ret0, _ := ret[0].(*list.AclRecord)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetIndex indicates an expected call of GetIndex.
+func (mr *MockSyncAclMockRecorder) GetIndex(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetIndex", reflect.TypeOf((*MockSyncAcl)(nil).GetIndex), arg0)
+}
+
+// HandleMessage mocks base method.
+func (m *MockSyncAcl) HandleMessage(arg0 context.Context, arg1 string, arg2 *spacesyncproto.ObjectSyncMessage) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HandleMessage", arg0, arg1, arg2)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// HandleMessage indicates an expected call of HandleMessage.
+func (mr *MockSyncAclMockRecorder) HandleMessage(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HandleMessage", reflect.TypeOf((*MockSyncAcl)(nil).HandleMessage), arg0, arg1, arg2)
+}
+
+// HandleRequest mocks base method.
+func (m *MockSyncAcl) HandleRequest(arg0 context.Context, arg1 string, arg2 *spacesyncproto.ObjectSyncMessage) (*spacesyncproto.ObjectSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HandleRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*spacesyncproto.ObjectSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// HandleRequest indicates an expected call of HandleRequest.
+func (mr *MockSyncAclMockRecorder) HandleRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HandleRequest", reflect.TypeOf((*MockSyncAcl)(nil).HandleRequest), arg0, arg1, arg2)
+}
+
+// HasHead mocks base method.
+func (m *MockSyncAcl) HasHead(arg0 string) bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HasHead", arg0)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// HasHead indicates an expected call of HasHead.
+func (mr *MockSyncAclMockRecorder) HasHead(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HasHead", reflect.TypeOf((*MockSyncAcl)(nil).HasHead), arg0)
+}
+
+// Head mocks base method.
+func (m *MockSyncAcl) Head() *list.AclRecord {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Head")
+	ret0, _ := ret[0].(*list.AclRecord)
+	return ret0
+}
+
+// Head indicates an expected call of Head.
+func (mr *MockSyncAclMockRecorder) Head() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Head", reflect.TypeOf((*MockSyncAcl)(nil).Head))
+}
+
+// Id mocks base method.
+func (m *MockSyncAcl) Id() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Id")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Id indicates an expected call of Id.
+func (mr *MockSyncAclMockRecorder) Id() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Id", reflect.TypeOf((*MockSyncAcl)(nil).Id))
+}
+
+// Init mocks base method.
+func (m *MockSyncAcl) Init(arg0 *app.App) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Init", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Init indicates an expected call of Init.
+func (mr *MockSyncAclMockRecorder) Init(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockSyncAcl)(nil).Init), arg0)
+}
+
+// IsAfter mocks base method.
+func (m *MockSyncAcl) IsAfter(arg0, arg1 string) (bool, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "IsAfter", arg0, arg1)
+	ret0, _ := ret[0].(bool)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// IsAfter indicates an expected call of IsAfter.
+func (mr *MockSyncAclMockRecorder) IsAfter(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsAfter", reflect.TypeOf((*MockSyncAcl)(nil).IsAfter), arg0, arg1)
+}
+
+// Iterate mocks base method.
+func (m *MockSyncAcl) Iterate(arg0 func(*list.AclRecord) bool) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Iterate", arg0)
+}
+
+// Iterate indicates an expected call of Iterate.
+func (mr *MockSyncAclMockRecorder) Iterate(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Iterate", reflect.TypeOf((*MockSyncAcl)(nil).Iterate), arg0)
+}
+
+// IterateFrom mocks base method.
+func (m *MockSyncAcl) IterateFrom(arg0 string, arg1 func(*list.AclRecord) bool) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "IterateFrom", arg0, arg1)
+}
+
+// IterateFrom indicates an expected call of IterateFrom.
+func (mr *MockSyncAclMockRecorder) IterateFrom(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IterateFrom", reflect.TypeOf((*MockSyncAcl)(nil).IterateFrom), arg0, arg1)
+}
+
+// KeyStorage mocks base method.
+func (m *MockSyncAcl) KeyStorage() crypto.KeyStorage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "KeyStorage")
+	ret0, _ := ret[0].(crypto.KeyStorage)
+	return ret0
+}
+
+// KeyStorage indicates an expected call of KeyStorage.
+func (mr *MockSyncAclMockRecorder) KeyStorage() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "KeyStorage", reflect.TypeOf((*MockSyncAcl)(nil).KeyStorage))
+}
+
+// Lock mocks base method.
+func (m *MockSyncAcl) Lock() {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Lock")
+}
+
+// Lock indicates an expected call of Lock.
+func (mr *MockSyncAclMockRecorder) Lock() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Lock", reflect.TypeOf((*MockSyncAcl)(nil).Lock))
+}
+
+// Name mocks base method.
+func (m *MockSyncAcl) Name() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Name")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Name indicates an expected call of Name.
+func (mr *MockSyncAclMockRecorder) Name() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Name", reflect.TypeOf((*MockSyncAcl)(nil).Name))
+}
+
+// RLock mocks base method.
+func (m *MockSyncAcl) RLock() {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "RLock")
+}
+
+// RLock indicates an expected call of RLock.
+func (mr *MockSyncAclMockRecorder) RLock() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RLock", reflect.TypeOf((*MockSyncAcl)(nil).RLock))
+}
+
+// RUnlock mocks base method.
+func (m *MockSyncAcl) RUnlock() {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "RUnlock")
+}
+
+// RUnlock indicates an expected call of RUnlock.
+func (mr *MockSyncAclMockRecorder) RUnlock() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RUnlock", reflect.TypeOf((*MockSyncAcl)(nil).RUnlock))
+}
+
+// RecordBuilder mocks base method.
+func (m *MockSyncAcl) RecordBuilder() list.AclRecordBuilder {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RecordBuilder")
+	ret0, _ := ret[0].(list.AclRecordBuilder)
+	return ret0
+}
+
+// RecordBuilder indicates an expected call of RecordBuilder.
+func (mr *MockSyncAclMockRecorder) RecordBuilder() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RecordBuilder", reflect.TypeOf((*MockSyncAcl)(nil).RecordBuilder))
+}
+
+// Records mocks base method.
+func (m *MockSyncAcl) Records() []*list.AclRecord {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Records")
+	ret0, _ := ret[0].([]*list.AclRecord)
+	return ret0
+}
+
+// Records indicates an expected call of Records.
+func (mr *MockSyncAclMockRecorder) Records() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Records", reflect.TypeOf((*MockSyncAcl)(nil).Records))
+}
+
+// RecordsAfter mocks base method.
+func (m *MockSyncAcl) RecordsAfter(arg0 context.Context, arg1 string) ([]*consensusproto.RawRecordWithId, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RecordsAfter", arg0, arg1)
+	ret0, _ := ret[0].([]*consensusproto.RawRecordWithId)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// RecordsAfter indicates an expected call of RecordsAfter.
+func (mr *MockSyncAclMockRecorder) RecordsAfter(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RecordsAfter", reflect.TypeOf((*MockSyncAcl)(nil).RecordsAfter), arg0, arg1)
+}
+
+// RecordsBefore mocks base method.
+func (m *MockSyncAcl) RecordsBefore(arg0 context.Context, arg1 string) ([]*consensusproto.RawRecordWithId, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RecordsBefore", arg0, arg1)
+	ret0, _ := ret[0].([]*consensusproto.RawRecordWithId)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// RecordsBefore indicates an expected call of RecordsBefore.
+func (mr *MockSyncAclMockRecorder) RecordsBefore(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RecordsBefore", reflect.TypeOf((*MockSyncAcl)(nil).RecordsBefore), arg0, arg1)
+}
+
+// Root mocks base method.
+func (m *MockSyncAcl) Root() *consensusproto.RawRecordWithId {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Root")
+	ret0, _ := ret[0].(*consensusproto.RawRecordWithId)
+	return ret0
+}
+
+// Root indicates an expected call of Root.
+func (mr *MockSyncAclMockRecorder) Root() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Root", reflect.TypeOf((*MockSyncAcl)(nil).Root))
+}
+
+// Run mocks base method.
+func (m *MockSyncAcl) Run(arg0 context.Context) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Run", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Run indicates an expected call of Run.
+func (mr *MockSyncAclMockRecorder) Run(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Run", reflect.TypeOf((*MockSyncAcl)(nil).Run), arg0)
+}
+
+// SetHeadUpdater mocks base method.
+func (m *MockSyncAcl) SetHeadUpdater(arg0 headupdater.HeadUpdater) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "SetHeadUpdater", arg0)
+}
+
+// SetHeadUpdater indicates an expected call of SetHeadUpdater.
+func (mr *MockSyncAclMockRecorder) SetHeadUpdater(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetHeadUpdater", reflect.TypeOf((*MockSyncAcl)(nil).SetHeadUpdater), arg0)
+}
+
+// SyncWithPeer mocks base method.
+func (m *MockSyncAcl) SyncWithPeer(arg0 context.Context, arg1 string) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SyncWithPeer", arg0, arg1)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// SyncWithPeer indicates an expected call of SyncWithPeer.
+func (mr *MockSyncAclMockRecorder) SyncWithPeer(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SyncWithPeer", reflect.TypeOf((*MockSyncAcl)(nil).SyncWithPeer), arg0, arg1)
+}
+
+// Unlock mocks base method.
+func (m *MockSyncAcl) Unlock() {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Unlock")
+}
+
+// Unlock indicates an expected call of Unlock.
+func (mr *MockSyncAclMockRecorder) Unlock() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Unlock", reflect.TypeOf((*MockSyncAcl)(nil).Unlock))
+}
+
+// ValidateRawRecord mocks base method.
+func (m *MockSyncAcl) ValidateRawRecord(arg0 *consensusproto.RawRecord) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ValidateRawRecord", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// ValidateRawRecord indicates an expected call of ValidateRawRecord.
+func (mr *MockSyncAclMockRecorder) ValidateRawRecord(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ValidateRawRecord", reflect.TypeOf((*MockSyncAcl)(nil).ValidateRawRecord), arg0)
+}
+
+// MockSyncClient is a mock of SyncClient interface.
+type MockSyncClient struct {
+	ctrl     *gomock.Controller
+	recorder *MockSyncClientMockRecorder
+}
+
+// MockSyncClientMockRecorder is the mock recorder for MockSyncClient.
+type MockSyncClientMockRecorder struct {
+	mock *MockSyncClient
+}
+
+// NewMockSyncClient creates a new mock instance.
+func NewMockSyncClient(ctrl *gomock.Controller) *MockSyncClient {
+	mock := &MockSyncClient{ctrl: ctrl}
+	mock.recorder = &MockSyncClientMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockSyncClient) EXPECT() *MockSyncClientMockRecorder {
+	return m.recorder
+}
+
+// Broadcast mocks base method.
+func (m *MockSyncClient) Broadcast(arg0 *consensusproto.LogSyncMessage) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Broadcast", arg0)
+}
+
+// Broadcast indicates an expected call of Broadcast.
+func (mr *MockSyncClientMockRecorder) Broadcast(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Broadcast", reflect.TypeOf((*MockSyncClient)(nil).Broadcast), arg0)
+}
+
+// CreateFullSyncRequest mocks base method.
+func (m *MockSyncClient) CreateFullSyncRequest(arg0 list.AclList, arg1 string) (*consensusproto.LogSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncRequest", arg0, arg1)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncRequest indicates an expected call of CreateFullSyncRequest.
+func (mr *MockSyncClientMockRecorder) CreateFullSyncRequest(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncRequest", reflect.TypeOf((*MockSyncClient)(nil).CreateFullSyncRequest), arg0, arg1)
+}
+
+// CreateFullSyncResponse mocks base method.
+func (m *MockSyncClient) CreateFullSyncResponse(arg0 list.AclList, arg1 string) (*consensusproto.LogSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncResponse", arg0, arg1)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncResponse indicates an expected call of CreateFullSyncResponse.
+func (mr *MockSyncClientMockRecorder) CreateFullSyncResponse(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncResponse", reflect.TypeOf((*MockSyncClient)(nil).CreateFullSyncResponse), arg0, arg1)
+}
+
+// CreateHeadUpdate mocks base method.
+func (m *MockSyncClient) CreateHeadUpdate(arg0 list.AclList, arg1 []*consensusproto.RawRecordWithId) *consensusproto.LogSyncMessage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateHeadUpdate", arg0, arg1)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	return ret0
+}
+
+// CreateHeadUpdate indicates an expected call of CreateHeadUpdate.
+func (mr *MockSyncClientMockRecorder) CreateHeadUpdate(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateHeadUpdate", reflect.TypeOf((*MockSyncClient)(nil).CreateHeadUpdate), arg0, arg1)
+}
+
+// QueueRequest mocks base method.
+func (m *MockSyncClient) QueueRequest(arg0 string, arg1 *consensusproto.LogSyncMessage) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "QueueRequest", arg0, arg1)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// QueueRequest indicates an expected call of QueueRequest.
+func (mr *MockSyncClientMockRecorder) QueueRequest(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "QueueRequest", reflect.TypeOf((*MockSyncClient)(nil).QueueRequest), arg0, arg1)
+}
+
+// SendRequest mocks base method.
+func (m *MockSyncClient) SendRequest(arg0 context.Context, arg1 string, arg2 *consensusproto.LogSyncMessage) (*spacesyncproto.ObjectSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SendRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*spacesyncproto.ObjectSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// SendRequest indicates an expected call of SendRequest.
+func (mr *MockSyncClientMockRecorder) SendRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SendRequest", reflect.TypeOf((*MockSyncClient)(nil).SendRequest), arg0, arg1, arg2)
+}
+
+// SendUpdate mocks base method.
+func (m *MockSyncClient) SendUpdate(arg0 string, arg1 *consensusproto.LogSyncMessage) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SendUpdate", arg0, arg1)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// SendUpdate indicates an expected call of SendUpdate.
+func (mr *MockSyncClientMockRecorder) SendUpdate(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SendUpdate", reflect.TypeOf((*MockSyncClient)(nil).SendUpdate), arg0, arg1)
+}
+
+// MockRequestFactory is a mock of RequestFactory interface.
+type MockRequestFactory struct {
+	ctrl     *gomock.Controller
+	recorder *MockRequestFactoryMockRecorder
+}
+
+// MockRequestFactoryMockRecorder is the mock recorder for MockRequestFactory.
+type MockRequestFactoryMockRecorder struct {
+	mock *MockRequestFactory
+}
+
+// NewMockRequestFactory creates a new mock instance.
+func NewMockRequestFactory(ctrl *gomock.Controller) *MockRequestFactory {
+	mock := &MockRequestFactory{ctrl: ctrl}
+	mock.recorder = &MockRequestFactoryMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockRequestFactory) EXPECT() *MockRequestFactoryMockRecorder {
+	return m.recorder
+}
+
+// CreateFullSyncRequest mocks base method.
+func (m *MockRequestFactory) CreateFullSyncRequest(arg0 list.AclList, arg1 string) (*consensusproto.LogSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncRequest", arg0, arg1)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncRequest indicates an expected call of CreateFullSyncRequest.
+func (mr *MockRequestFactoryMockRecorder) CreateFullSyncRequest(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncRequest", reflect.TypeOf((*MockRequestFactory)(nil).CreateFullSyncRequest), arg0, arg1)
+}
+
+// CreateFullSyncResponse mocks base method.
+func (m *MockRequestFactory) CreateFullSyncResponse(arg0 list.AclList, arg1 string) (*consensusproto.LogSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncResponse", arg0, arg1)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncResponse indicates an expected call of CreateFullSyncResponse.
+func (mr *MockRequestFactoryMockRecorder) CreateFullSyncResponse(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncResponse", reflect.TypeOf((*MockRequestFactory)(nil).CreateFullSyncResponse), arg0, arg1)
+}
+
+// CreateHeadUpdate mocks base method.
+func (m *MockRequestFactory) CreateHeadUpdate(arg0 list.AclList, arg1 []*consensusproto.RawRecordWithId) *consensusproto.LogSyncMessage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateHeadUpdate", arg0, arg1)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	return ret0
+}
+
+// CreateHeadUpdate indicates an expected call of CreateHeadUpdate.
+func (mr *MockRequestFactoryMockRecorder) CreateHeadUpdate(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateHeadUpdate", reflect.TypeOf((*MockRequestFactory)(nil).CreateHeadUpdate), arg0, arg1)
+}
+
+// MockAclSyncProtocol is a mock of AclSyncProtocol interface.
+type MockAclSyncProtocol struct {
+	ctrl     *gomock.Controller
+	recorder *MockAclSyncProtocolMockRecorder
+}
+
+// MockAclSyncProtocolMockRecorder is the mock recorder for MockAclSyncProtocol.
+type MockAclSyncProtocolMockRecorder struct {
+	mock *MockAclSyncProtocol
+}
+
+// NewMockAclSyncProtocol creates a new mock instance.
+func NewMockAclSyncProtocol(ctrl *gomock.Controller) *MockAclSyncProtocol {
+	mock := &MockAclSyncProtocol{ctrl: ctrl}
+	mock.recorder = &MockAclSyncProtocolMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockAclSyncProtocol) EXPECT() *MockAclSyncProtocolMockRecorder {
+	return m.recorder
+}
+
+// FullSyncRequest mocks base method.
+func (m *MockAclSyncProtocol) FullSyncRequest(arg0 context.Context, arg1 string, arg2 *consensusproto.LogFullSyncRequest) (*consensusproto.LogSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FullSyncRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// FullSyncRequest indicates an expected call of FullSyncRequest.
+func (mr *MockAclSyncProtocolMockRecorder) FullSyncRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FullSyncRequest", reflect.TypeOf((*MockAclSyncProtocol)(nil).FullSyncRequest), arg0, arg1, arg2)
+}
+
+// FullSyncResponse mocks base method.
+func (m *MockAclSyncProtocol) FullSyncResponse(arg0 context.Context, arg1 string, arg2 *consensusproto.LogFullSyncResponse) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FullSyncResponse", arg0, arg1, arg2)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// FullSyncResponse indicates an expected call of FullSyncResponse.
+func (mr *MockAclSyncProtocolMockRecorder) FullSyncResponse(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FullSyncResponse", reflect.TypeOf((*MockAclSyncProtocol)(nil).FullSyncResponse), arg0, arg1, arg2)
+}
+
+// HeadUpdate mocks base method.
+func (m *MockAclSyncProtocol) HeadUpdate(arg0 context.Context, arg1 string, arg2 *consensusproto.LogHeadUpdate) (*consensusproto.LogSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HeadUpdate", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*consensusproto.LogSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// HeadUpdate indicates an expected call of HeadUpdate.
+func (mr *MockAclSyncProtocolMockRecorder) HeadUpdate(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HeadUpdate", reflect.TypeOf((*MockAclSyncProtocol)(nil).HeadUpdate), arg0, arg1, arg2)
+}

commonspace/object/acl/syncacl/requestfactory.go

@@ -0,0 +1,54 @@
+package syncacl
+
+import (
+	"context"
+
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+)
+
+type RequestFactory interface {
+	CreateHeadUpdate(l list.AclList, added []*consensusproto.RawRecordWithId) (msg *consensusproto.LogSyncMessage)
+	CreateFullSyncRequest(l list.AclList, theirHead string) (req *consensusproto.LogSyncMessage, err error)
+	CreateFullSyncResponse(l list.AclList, theirHead string) (*consensusproto.LogSyncMessage, error)
+}
+
+type requestFactory struct{}
+
+func NewRequestFactory() RequestFactory {
+	return &requestFactory{}
+}
+
+func (r *requestFactory) CreateHeadUpdate(l list.AclList, added []*consensusproto.RawRecordWithId) (msg *consensusproto.LogSyncMessage) {
+	return consensusproto.WrapHeadUpdate(&consensusproto.LogHeadUpdate{
+		Head:    l.Head().Id,
+		Records: added,
+	}, l.Root())
+}
+
+func (r *requestFactory) CreateFullSyncRequest(l list.AclList, theirHead string) (req *consensusproto.LogSyncMessage, err error) {
+	if !l.HasHead(theirHead) {
+		return consensusproto.WrapFullRequest(&consensusproto.LogFullSyncRequest{
+			Head: l.Head().Id,
+		}, l.Root()), nil
+	}
+	records, err := l.RecordsAfter(context.Background(), theirHead)
+	if err != nil {
+		return
+	}
+	return consensusproto.WrapFullRequest(&consensusproto.LogFullSyncRequest{
+		Head:    l.Head().Id,
+		Records: records,
+	}, l.Root()), nil
+}
+
+func (r *requestFactory) CreateFullSyncResponse(l list.AclList, theirHead string) (resp *consensusproto.LogSyncMessage, err error) {
+	records, err := l.RecordsAfter(context.Background(), theirHead)
+	if err != nil {
+		return
+	}
+	return consensusproto.WrapFullResponse(&consensusproto.LogFullSyncResponse{
+		Head:    l.Head().Id,
+		Records: records,
+	}, l.Root()), nil
+}

commonspace/object/acl/syncacl/syncacl.go

@@ -1,21 +1,130 @@
 package syncacl
 
 import (
+	"context"
+	"errors"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl/headupdater"
+	"github.com/anyproto/any-sync/commonspace/object/syncobjectgetter"
+
+	"github.com/anyproto/any-sync/accountservice"
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
-	"github.com/anyproto/any-sync/commonspace/objectsync"
 	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
+	"github.com/anyproto/any-sync/commonspace/peermanager"
+	"github.com/anyproto/any-sync/commonspace/requestmanager"
+	"github.com/anyproto/any-sync/commonspace/spacestorage"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/commonspace/syncstatus"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 )
 
-type SyncAcl struct {
+const CName = "common.acl.syncacl"
+
+var (
+	log = logger.NewNamed(CName)
+
+	ErrSyncAclClosed = errors.New("sync acl is closed")
+)
+
+type SyncAcl interface {
+	app.ComponentRunnable
 	list.AclList
-	synchandler.SyncHandler
-	messagePool objectsync.MessagePool
+	syncobjectgetter.SyncObject
+	SetHeadUpdater(updater headupdater.HeadUpdater)
+	SyncWithPeer(ctx context.Context, peerId string) (err error)
 }
 
-func NewSyncAcl(aclList list.AclList, messagePool objectsync.MessagePool) *SyncAcl {
-	return &SyncAcl{
-		AclList:     aclList,
-		SyncHandler: nil,
-		messagePool: messagePool,
-	}
+func New() SyncAcl {
+	return &syncAcl{}
+}
+
+type syncAcl struct {
+	list.AclList
+	syncClient  SyncClient
+	syncHandler synchandler.SyncHandler
+	headUpdater headupdater.HeadUpdater
+	isClosed    bool
+}
+
+func (s *syncAcl) Run(ctx context.Context) (err error) {
+	return
+}
+
+func (s *syncAcl) HandleRequest(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (response *spacesyncproto.ObjectSyncMessage, err error) {
+	return s.syncHandler.HandleRequest(ctx, senderId, request)
+}
+
+func (s *syncAcl) SetHeadUpdater(updater headupdater.HeadUpdater) {
+	s.headUpdater = updater
+}
+
+func (s *syncAcl) HandleMessage(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (err error) {
+	return s.syncHandler.HandleMessage(ctx, senderId, request)
+}
+
+func (s *syncAcl) Init(a *app.App) (err error) {
+	storage := a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	aclStorage, err := storage.AclStorage()
+	if err != nil {
+		return err
+	}
+	acc := a.MustComponent(accountservice.CName).(accountservice.Service)
+	s.AclList, err = list.BuildAclListWithIdentity(acc.Account(), aclStorage, list.NoOpAcceptorVerifier{})
+	if err != nil {
+		return
+	}
+	spaceId := storage.Id()
+	requestManager := a.MustComponent(requestmanager.CName).(requestmanager.RequestManager)
+	peerManager := a.MustComponent(peermanager.CName).(peermanager.PeerManager)
+	syncStatus := a.MustComponent(syncstatus.CName).(syncstatus.StatusService)
+	s.syncClient = NewSyncClient(spaceId, requestManager, peerManager)
+	s.syncHandler = newSyncAclHandler(storage.Id(), s, s.syncClient, syncStatus)
+	return err
+}
+
+func (s *syncAcl) AddRawRecord(rawRec *consensusproto.RawRecordWithId) (err error) {
+	if s.isClosed {
+		return ErrSyncAclClosed
+	}
+	err = s.AclList.AddRawRecord(rawRec)
+	if err != nil {
+		return
+	}
+	headUpdate := s.syncClient.CreateHeadUpdate(s, []*consensusproto.RawRecordWithId{rawRec})
+	s.headUpdater.UpdateHeads(s.Id(), []string{rawRec.Id})
+	s.syncClient.Broadcast(headUpdate)
+	return
+}
+
+func (s *syncAcl) AddRawRecords(rawRecords []*consensusproto.RawRecordWithId) (err error) {
+	if s.isClosed {
+		return ErrSyncAclClosed
+	}
+	err = s.AclList.AddRawRecords(rawRecords)
+	if err != nil {
+		return
+	}
+	headUpdate := s.syncClient.CreateHeadUpdate(s, rawRecords)
+	s.headUpdater.UpdateHeads(s.Id(), []string{rawRecords[len(rawRecords)-1].Id})
+	s.syncClient.Broadcast(headUpdate)
+	return
+}
+
+func (s *syncAcl) SyncWithPeer(ctx context.Context, peerId string) (err error) {
+	s.Lock()
+	defer s.Unlock()
+	headUpdate := s.syncClient.CreateHeadUpdate(s, nil)
+	return s.syncClient.SendUpdate(peerId, headUpdate)
+}
+
+func (s *syncAcl) Close(ctx context.Context) (err error) {
+	s.Lock()
+	defer s.Unlock()
+	s.isClosed = true
+	return
+}
+
+func (s *syncAcl) Name() (name string) {
+	return CName
 }

commonspace/object/acl/syncacl/syncaclhandler.go

@@ -2,30 +2,81 @@ package syncacl
 
 import (
 	"context"
-	"fmt"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"errors"
+
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/commonspace/syncstatus"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/gogo/protobuf/proto"
+)
+
+var (
+	ErrMessageIsRequest    = errors.New("message is request")
+	ErrMessageIsNotRequest = errors.New("message is not request")
 )
 
 type syncAclHandler struct {
-	acl list.AclList
+	aclList      list.AclList
+	syncClient   SyncClient
+	syncProtocol AclSyncProtocol
+	syncStatus   syncstatus.StatusUpdater
+	spaceId      string
 }
 
-func (s *syncAclHandler) HandleMessage(ctx context.Context, senderId string, req *spacesyncproto.ObjectSyncMessage) (err error) {
-	aclMsg := &aclrecordproto.AclSyncMessage{}
-	if err = aclMsg.Unmarshal(req.Payload); err != nil {
+func newSyncAclHandler(spaceId string, aclList list.AclList, syncClient SyncClient, syncStatus syncstatus.StatusUpdater) synchandler.SyncHandler {
+	return &syncAclHandler{
+		aclList:      aclList,
+		syncClient:   syncClient,
+		syncProtocol: newAclSyncProtocol(spaceId, aclList, syncClient),
+		syncStatus:   syncStatus,
+		spaceId:      spaceId,
+	}
+}
+
+func (s *syncAclHandler) HandleMessage(ctx context.Context, senderId string, message *spacesyncproto.ObjectSyncMessage) (err error) {
+	unmarshalled := &consensusproto.LogSyncMessage{}
+	err = proto.Unmarshal(message.Payload, unmarshalled)
+	if err != nil {
 		return
 	}
-	content := aclMsg.GetContent()
+	content := unmarshalled.GetContent()
+	head := consensusproto.GetHead(unmarshalled)
+	s.syncStatus.HeadsReceive(senderId, s.aclList.Id(), []string{head})
+	s.aclList.Lock()
+	defer s.aclList.Unlock()
 	switch {
-	case content.GetAddRecords() != nil:
-		return s.handleAddRecords(ctx, senderId, content.GetAddRecords())
-	default:
-		return fmt.Errorf("unexpected aclSync message: %T", content.Value)
+	case content.GetHeadUpdate() != nil:
+		var syncReq *consensusproto.LogSyncMessage
+		syncReq, err = s.syncProtocol.HeadUpdate(ctx, senderId, content.GetHeadUpdate())
+		if err != nil || syncReq == nil {
+			return
+		}
+		return s.syncClient.QueueRequest(senderId, syncReq)
+	case content.GetFullSyncRequest() != nil:
+		return ErrMessageIsRequest
+	case content.GetFullSyncResponse() != nil:
+		return s.syncProtocol.FullSyncResponse(ctx, senderId, content.GetFullSyncResponse())
 	}
-}
-
-func (s *syncAclHandler) handleAddRecords(ctx context.Context, senderId string, addRecord *aclrecordproto.AclAddRecords) (err error) {
 	return
 }
+
+func (s *syncAclHandler) HandleRequest(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (response *spacesyncproto.ObjectSyncMessage, err error) {
+	unmarshalled := &consensusproto.LogSyncMessage{}
+	err = proto.Unmarshal(request.Payload, unmarshalled)
+	if err != nil {
+		return
+	}
+	fullSyncRequest := unmarshalled.GetContent().GetFullSyncRequest()
+	if fullSyncRequest == nil {
+		return nil, ErrMessageIsNotRequest
+	}
+	s.aclList.Lock()
+	defer s.aclList.Unlock()
+	aclResp, err := s.syncProtocol.FullSyncRequest(ctx, senderId, fullSyncRequest)
+	if err != nil {
+		return
+	}
+	return spacesyncproto.MarshallSyncMessage(aclResp, s.spaceId, s.aclList.Id())
+}

commonspace/object/acl/syncacl/syncaclhandler_test.go

@@ -0,0 +1,233 @@
+package syncacl
+
+import (
+	"context"
+	"fmt"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list/mock_list"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl/mock_syncacl"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/commonspace/syncstatus"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/gogo/protobuf/proto"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+	"sync"
+	"testing"
+)
+
+type testAclMock struct {
+	*mock_list.MockAclList
+	m sync.RWMutex
+}
+
+func newTestAclMock(mockAcl *mock_list.MockAclList) *testAclMock {
+	return &testAclMock{
+		MockAclList: mockAcl,
+	}
+}
+
+func (t *testAclMock) Lock() {
+	t.m.Lock()
+}
+
+func (t *testAclMock) RLock() {
+	t.m.RLock()
+}
+
+func (t *testAclMock) Unlock() {
+	t.m.Unlock()
+}
+
+func (t *testAclMock) RUnlock() {
+	t.m.RUnlock()
+}
+
+func (t *testAclMock) TryLock() bool {
+	return t.m.TryLock()
+}
+
+func (t *testAclMock) TryRLock() bool {
+	return t.m.TryRLock()
+}
+
+type syncHandlerFixture struct {
+	ctrl             *gomock.Controller
+	syncClientMock   *mock_syncacl.MockSyncClient
+	aclMock          *testAclMock
+	syncProtocolMock *mock_syncacl.MockAclSyncProtocol
+	spaceId          string
+	senderId         string
+	aclId            string
+
+	syncHandler *syncAclHandler
+}
+
+func newSyncHandlerFixture(t *testing.T) *syncHandlerFixture {
+	ctrl := gomock.NewController(t)
+	aclMock := newTestAclMock(mock_list.NewMockAclList(ctrl))
+	syncClientMock := mock_syncacl.NewMockSyncClient(ctrl)
+	syncProtocolMock := mock_syncacl.NewMockAclSyncProtocol(ctrl)
+	spaceId := "spaceId"
+
+	syncHandler := &syncAclHandler{
+		aclList:      aclMock,
+		syncClient:   syncClientMock,
+		syncProtocol: syncProtocolMock,
+		syncStatus:   syncstatus.NewNoOpSyncStatus(),
+		spaceId:      spaceId,
+	}
+	return &syncHandlerFixture{
+		ctrl:             ctrl,
+		syncClientMock:   syncClientMock,
+		aclMock:          aclMock,
+		syncProtocolMock: syncProtocolMock,
+		spaceId:          spaceId,
+		senderId:         "senderId",
+		aclId:            "aclId",
+		syncHandler:      syncHandler,
+	}
+}
+
+func (fx *syncHandlerFixture) stop() {
+	fx.ctrl.Finish()
+}
+
+func TestSyncAclHandler_HandleMessage(t *testing.T) {
+	ctx := context.Background()
+	t.Run("handle head update, request returned", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapHeadUpdate(headUpdate, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		syncReq := &consensusproto.LogSyncMessage{}
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.syncProtocolMock.EXPECT().HeadUpdate(ctx, fx.senderId, gomock.Any()).Return(syncReq, nil)
+		fx.syncClientMock.EXPECT().QueueRequest(fx.senderId, syncReq).Return(nil)
+
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
+		require.NoError(t, err)
+	})
+	t.Run("handle head update, no request", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapHeadUpdate(headUpdate, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.syncProtocolMock.EXPECT().HeadUpdate(ctx, fx.senderId, gomock.Any()).Return(nil, nil)
+
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
+		require.NoError(t, err)
+	})
+	t.Run("handle head update, returned error", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapHeadUpdate(headUpdate, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		expectedErr := fmt.Errorf("some error")
+		fx.syncProtocolMock.EXPECT().HeadUpdate(ctx, fx.senderId, gomock.Any()).Return(nil, expectedErr)
+
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
+		require.Error(t, expectedErr, err)
+	})
+	t.Run("handle full sync request is forbidden", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullRequest := &consensusproto.LogFullSyncRequest{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapFullRequest(fullRequest, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
+		require.Error(t, ErrMessageIsRequest, err)
+	})
+	t.Run("handle full sync response, no error", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullResponse := &consensusproto.LogFullSyncResponse{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapFullResponse(fullResponse, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.syncProtocolMock.EXPECT().FullSyncResponse(ctx, fx.senderId, gomock.Any()).Return(nil)
+
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
+		require.NoError(t, err)
+	})
+}
+
+func TestSyncAclHandler_HandleRequest(t *testing.T) {
+	ctx := context.Background()
+	t.Run("handle full sync request, no error", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullRequest := &consensusproto.LogFullSyncRequest{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapFullRequest(fullRequest, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+		fullResp := &consensusproto.LogSyncMessage{
+			Content: &consensusproto.LogSyncContentValue{
+				Value: &consensusproto.LogSyncContentValue_FullSyncResponse{
+					FullSyncResponse: &consensusproto.LogFullSyncResponse{
+						Head: "returnedHead",
+					},
+				},
+			},
+		}
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.syncProtocolMock.EXPECT().FullSyncRequest(ctx, fx.senderId, gomock.Any()).Return(fullResp, nil)
+		res, err := fx.syncHandler.HandleRequest(ctx, fx.senderId, objectMsg)
+		require.NoError(t, err)
+		unmarshalled := &consensusproto.LogSyncMessage{}
+		err = proto.Unmarshal(res.Payload, unmarshalled)
+		if err != nil {
+			return
+		}
+		require.Equal(t, "returnedHead", consensusproto.GetHead(unmarshalled))
+	})
+	t.Run("handle other message returns error", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		headUpdate := &consensusproto.LogHeadUpdate{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapHeadUpdate(headUpdate, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		_, err := fx.syncHandler.HandleRequest(ctx, fx.senderId, objectMsg)
+		require.Error(t, ErrMessageIsNotRequest, err)
+	})
+}

commonspace/object/acl/syncacl/syncclient.go

@@ -0,0 +1,70 @@
+package syncacl
+
+import (
+	"context"
+
+	"github.com/anyproto/any-sync/commonspace/peermanager"
+	"github.com/anyproto/any-sync/commonspace/requestmanager"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"go.uber.org/zap"
+)
+
+type SyncClient interface {
+	RequestFactory
+	Broadcast(msg *consensusproto.LogSyncMessage)
+	SendUpdate(peerId string, msg *consensusproto.LogSyncMessage) (err error)
+	QueueRequest(peerId string, msg *consensusproto.LogSyncMessage) (err error)
+	SendRequest(ctx context.Context, peerId string, msg *consensusproto.LogSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error)
+}
+
+type syncClient struct {
+	RequestFactory
+	spaceId        string
+	requestManager requestmanager.RequestManager
+	peerManager    peermanager.PeerManager
+}
+
+func NewSyncClient(spaceId string, requestManager requestmanager.RequestManager, peerManager peermanager.PeerManager) SyncClient {
+	return &syncClient{
+		RequestFactory: &requestFactory{},
+		spaceId:        spaceId,
+		requestManager: requestManager,
+		peerManager:    peerManager,
+	}
+}
+
+func (s *syncClient) Broadcast(msg *consensusproto.LogSyncMessage) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, msg.Id)
+	if err != nil {
+		return
+	}
+	err = s.peerManager.Broadcast(context.Background(), objMsg)
+	if err != nil {
+		log.Debug("broadcast error", zap.Error(err))
+	}
+}
+
+func (s *syncClient) SendUpdate(peerId string, msg *consensusproto.LogSyncMessage) (err error) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, msg.Id)
+	if err != nil {
+		return
+	}
+	return s.peerManager.SendPeer(context.Background(), peerId, objMsg)
+}
+
+func (s *syncClient) SendRequest(ctx context.Context, peerId string, msg *consensusproto.LogSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, msg.Id)
+	if err != nil {
+		return
+	}
+	return s.requestManager.SendRequest(ctx, peerId, objMsg)
+}
+
+func (s *syncClient) QueueRequest(peerId string, msg *consensusproto.LogSyncMessage) (err error) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, msg.Id)
+	if err != nil {
+		return
+	}
+	return s.requestManager.QueueRequest(peerId, objMsg)
+}

commonspace/object/tree/exporter/treeimport.go

@@ -15,7 +15,7 @@ type TreeImportParams struct {
 }
 
 func ImportHistoryTree(params TreeImportParams) (tree objecttree.ReadableObjectTree, err error) {
-	aclList, err := list.BuildAclList(params.ListStorage)
+	aclList, err := list.BuildAclList(params.ListStorage, list.NoOpAcceptorVerifier{})
 	if err != nil {
 		return
 	}

commonspace/object/tree/objecttree/mock_objecttree/mock_objecttree.go

@@ -13,7 +13,7 @@ import (
 	objecttree "github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	treechangeproto "github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	treestorage "github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockObjectTree is a mock of ObjectTree interface.

commonspace/object/tree/objecttree/objecttree.go

@@ -4,11 +4,11 @@ package objecttree
 import (
 	"context"
 	"errors"
-	"github.com/anyproto/any-sync/util/crypto"
 	"sync"
 	"time"
 
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"github.com/anyproto/any-sync/util/crypto"
+
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
@@ -248,9 +248,7 @@ func (ot *objectTree) prepareBuilderContent(content SignableChangeContent) (cnt
 		pubKey    = content.Key.GetPublic()
 		readKeyId string
 	)
-	canWrite := state.HasPermission(pubKey, aclrecordproto.AclUserPermissions_Writer) ||
-		state.HasPermission(pubKey, aclrecordproto.AclUserPermissions_Admin)
-	if !canWrite {
+	if !state.Permissions(pubKey).CanWrite() {
 		err = list.ErrInsufficientPermissions
 		return
 	}

commonspace/object/tree/objecttree/objecttree_test.go

@@ -3,6 +3,9 @@ package objecttree
 import (
 	"context"
 	"fmt"
+	"testing"
+	"time"
+
 	"github.com/anyproto/any-sync/commonspace/object/accountdata"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
@@ -10,8 +13,6 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"testing"
-	"time"
 )
 
 type testTreeContext struct {
@@ -123,6 +124,7 @@ func TestObjectTree(t *testing.T) {
 			require.NoError(t, err)
 			require.GreaterOrEqual(t, start.Unix(), ch.Timestamp)
 			require.LessOrEqual(t, end.Unix(), ch.Timestamp)
+			require.Equal(t, res.Added[0].Id, oTree.(*objectTree).tree.lastIteratedHeadId)
 		})
 		t.Run("timestamp is set correctly", func(t *testing.T) {
 			someTs := time.Now().Add(time.Hour).Unix()
@@ -139,6 +141,7 @@ func TestObjectTree(t *testing.T) {
 			ch, err := oTree.(*objectTree).changeBuilder.Unmarshall(res.Added[0], true)
 			require.NoError(t, err)
 			require.Equal(t, ch.Timestamp, someTs)
+			require.Equal(t, res.Added[0].Id, oTree.(*objectTree).tree.lastIteratedHeadId)
 		})
 	})
 

commonspace/object/tree/objecttree/objecttreevalidator.go

@@ -3,7 +3,7 @@ package objecttree
 import (
 	"context"
 	"fmt"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/util/slice"
@@ -52,20 +52,18 @@ func (v *objectTreeValidator) ValidateNewChanges(tree *Tree, aclList list.AclLis
 
 func (v *objectTreeValidator) validateChange(tree *Tree, aclList list.AclList, c *Change) (err error) {
 	var (
-		perm  list.AclUserState
-		state = aclList.AclState()
+		userState list.AclUserState
+		state     = aclList.AclState()
 	)
 	// checking if the user could write
-	perm, err = state.StateAtRecord(c.AclHeadId, c.Identity)
+	userState, err = state.StateAtRecord(c.AclHeadId, c.Identity)
 	if err != nil {
 		return
 	}
-
-	if perm.Permissions != aclrecordproto.AclUserPermissions_Writer && perm.Permissions != aclrecordproto.AclUserPermissions_Admin {
+	if !userState.Permissions.CanWrite() {
 		err = list.ErrInsufficientPermissions
 		return
 	}
-
 	if c.Id == tree.RootId() {
 		return
 	}

commonspace/object/tree/objecttree/rawloader.go

@@ -2,10 +2,11 @@ package objecttree
 
 import (
 	"context"
+	"time"
+
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/util/slice"
-	"time"
 )
 
 type rawChangeLoader struct {
@@ -22,6 +23,7 @@ type rawCacheEntry struct {
 	change    *Change
 	rawChange *treechangeproto.RawTreeChangeWithId
 	position  int
+	removed   bool
 }
 
 func newStorageLoader(treeStorage treestorage.TreeStorage, changeBuilder ChangeBuilder) *rawChangeLoader {
@@ -126,7 +128,6 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 		if err != nil {
 			continue
 		}
-		entry.position = -1
 		r.cache[b] = entry
 		existingBreakpoints = append(existingBreakpoints, b)
 	}
@@ -135,8 +136,7 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 	dfs := func(
 		commonSnapshot string,
 		heads []string,
-		startCounter int,
-		shouldVisit func(counter int, mapExists bool) bool,
+		shouldVisit func(entry rawCacheEntry, mapExists bool) bool,
 		visit func(entry rawCacheEntry) rawCacheEntry) bool {
 
 		// resetting stack
@@ -150,7 +150,7 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 			r.idStack = r.idStack[:len(r.idStack)-1]
 
 			entry, exists := r.cache[id]
-			if !shouldVisit(entry.position, exists) {
+			if !shouldVisit(entry, exists) {
 				continue
 			}
 			if id == commonSnapshot {
@@ -159,7 +159,6 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 			}
 			if !exists {
 				entry, err = r.loadEntry(id)
-				entry.position = -1
 				if err != nil {
 					continue
 				}
@@ -174,7 +173,7 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 					break
 				}
 				prevEntry, exists := r.cache[prev]
-				if !shouldVisit(prevEntry.position, exists) {
+				if !shouldVisit(prevEntry, exists) {
 					continue
 				}
 				r.idStack = append(r.idStack, prev)
@@ -187,8 +186,8 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 	r.idStack = append(r.idStack, heads...)
 	var buffer []*treechangeproto.RawTreeChangeWithId
 
-	rootVisited := dfs(commonSnapshot, heads, 0,
-		func(counter int, mapExists bool) bool {
+	rootVisited := dfs(commonSnapshot, heads,
+		func(_ rawCacheEntry, mapExists bool) bool {
 			return !mapExists
 		},
 		func(entry rawCacheEntry) rawCacheEntry {
@@ -213,11 +212,13 @@ func (r *rawChangeLoader) loadFromStorage(commonSnapshot string, heads, breakpoi
 	}
 
 	// marking all visited as nil
-	dfs(commonSnapshot, existingBreakpoints, len(buffer),
-		func(counter int, mapExists bool) bool {
-			return !mapExists || counter < len(buffer)
+	dfs(commonSnapshot, existingBreakpoints,
+		func(entry rawCacheEntry, mapExists bool) bool {
+			// only going through already loaded changes
+			return mapExists && !entry.removed
 		},
 		func(entry rawCacheEntry) rawCacheEntry {
+			entry.removed = true
 			if entry.position != -1 {
 				buffer[entry.position] = nil
 			}
@@ -248,6 +249,7 @@ func (r *rawChangeLoader) loadEntry(id string) (entry rawCacheEntry, err error)
 	entry = rawCacheEntry{
 		change:    change,
 		rawChange: rawChange,
+		position:  -1,
 	}
 	return
 }

commonspace/object/tree/objecttree/tree.go

@@ -82,6 +82,7 @@ func (t *Tree) AddMergedHead(c *Change) error {
 		}
 	}
 	t.headIds = []string{c.Id}
+	t.lastIteratedHeadId = c.Id
 	return nil
 }
 

commonspace/object/tree/objecttree/tree_test.go

@@ -2,10 +2,12 @@ package objecttree
 
 import (
 	"fmt"
-	"github.com/stretchr/testify/assert"
 	"math/rand"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func newChange(id string, snapshotId string, prevIds ...string) *Change {
@@ -26,6 +28,17 @@ func newSnapshot(id, snapshotId string, prevIds ...string) *Change {
 	}
 }
 
+func TestTree_AddMergedHead(t *testing.T) {
+	tr := new(Tree)
+	_, _ = tr.Add(
+		newSnapshot("root", ""),
+		newChange("one", "root", "root"),
+	)
+	require.Equal(t, tr.lastIteratedHeadId, "one")
+	tr.AddMergedHead(newChange("two", "root", "one"))
+	require.Equal(t, tr.lastIteratedHeadId, "two")
+}
+
 func TestTree_Add(t *testing.T) {
 	t.Run("add first el", func(t *testing.T) {
 		tr := new(Tree)

commonspace/object/tree/synctree/mock_synctree/mock_synctree.go

@@ -1,5 +1,5 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/anyproto/any-sync/commonspace/object/tree/synctree (interfaces: SyncTree,ReceiveQueue,HeadNotifiable)
+// Source: github.com/anyproto/any-sync/commonspace/object/tree/synctree (interfaces: SyncTree,ReceiveQueue,HeadNotifiable,SyncClient,RequestFactory,TreeSyncProtocol)
 
 // Package mock_synctree is a generated GoMock package.
 package mock_synctree
@@ -15,7 +15,7 @@ import (
 	treechangeproto "github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	treestorage "github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	spacesyncproto "github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockSyncTree is a mock of SyncTree interface.
@@ -186,6 +186,21 @@ func (mr *MockSyncTreeMockRecorder) HandleMessage(arg0, arg1, arg2 interface{})
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HandleMessage", reflect.TypeOf((*MockSyncTree)(nil).HandleMessage), arg0, arg1, arg2)
 }
 
+// HandleRequest mocks base method.
+func (m *MockSyncTree) HandleRequest(arg0 context.Context, arg1 string, arg2 *spacesyncproto.ObjectSyncMessage) (*spacesyncproto.ObjectSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HandleRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*spacesyncproto.ObjectSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// HandleRequest indicates an expected call of HandleRequest.
+func (mr *MockSyncTreeMockRecorder) HandleRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HandleRequest", reflect.TypeOf((*MockSyncTree)(nil).HandleRequest), arg0, arg1, arg2)
+}
+
 // HasChanges mocks base method.
 func (m *MockSyncTree) HasChanges(arg0 ...string) bool {
 	m.ctrl.T.Helper()
@@ -590,3 +605,287 @@ func (mr *MockHeadNotifiableMockRecorder) UpdateHeads(arg0, arg1 interface{}) *g
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateHeads", reflect.TypeOf((*MockHeadNotifiable)(nil).UpdateHeads), arg0, arg1)
 }
+
+// MockSyncClient is a mock of SyncClient interface.
+type MockSyncClient struct {
+	ctrl     *gomock.Controller
+	recorder *MockSyncClientMockRecorder
+}
+
+// MockSyncClientMockRecorder is the mock recorder for MockSyncClient.
+type MockSyncClientMockRecorder struct {
+	mock *MockSyncClient
+}
+
+// NewMockSyncClient creates a new mock instance.
+func NewMockSyncClient(ctrl *gomock.Controller) *MockSyncClient {
+	mock := &MockSyncClient{ctrl: ctrl}
+	mock.recorder = &MockSyncClientMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockSyncClient) EXPECT() *MockSyncClientMockRecorder {
+	return m.recorder
+}
+
+// Broadcast mocks base method.
+func (m *MockSyncClient) Broadcast(arg0 *treechangeproto.TreeSyncMessage) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Broadcast", arg0)
+}
+
+// Broadcast indicates an expected call of Broadcast.
+func (mr *MockSyncClientMockRecorder) Broadcast(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Broadcast", reflect.TypeOf((*MockSyncClient)(nil).Broadcast), arg0)
+}
+
+// CreateFullSyncRequest mocks base method.
+func (m *MockSyncClient) CreateFullSyncRequest(arg0 objecttree.ObjectTree, arg1, arg2 []string) (*treechangeproto.TreeSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncRequest indicates an expected call of CreateFullSyncRequest.
+func (mr *MockSyncClientMockRecorder) CreateFullSyncRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncRequest", reflect.TypeOf((*MockSyncClient)(nil).CreateFullSyncRequest), arg0, arg1, arg2)
+}
+
+// CreateFullSyncResponse mocks base method.
+func (m *MockSyncClient) CreateFullSyncResponse(arg0 objecttree.ObjectTree, arg1, arg2 []string) (*treechangeproto.TreeSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncResponse", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncResponse indicates an expected call of CreateFullSyncResponse.
+func (mr *MockSyncClientMockRecorder) CreateFullSyncResponse(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncResponse", reflect.TypeOf((*MockSyncClient)(nil).CreateFullSyncResponse), arg0, arg1, arg2)
+}
+
+// CreateHeadUpdate mocks base method.
+func (m *MockSyncClient) CreateHeadUpdate(arg0 objecttree.ObjectTree, arg1 []*treechangeproto.RawTreeChangeWithId) *treechangeproto.TreeSyncMessage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateHeadUpdate", arg0, arg1)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	return ret0
+}
+
+// CreateHeadUpdate indicates an expected call of CreateHeadUpdate.
+func (mr *MockSyncClientMockRecorder) CreateHeadUpdate(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateHeadUpdate", reflect.TypeOf((*MockSyncClient)(nil).CreateHeadUpdate), arg0, arg1)
+}
+
+// CreateNewTreeRequest mocks base method.
+func (m *MockSyncClient) CreateNewTreeRequest() *treechangeproto.TreeSyncMessage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateNewTreeRequest")
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	return ret0
+}
+
+// CreateNewTreeRequest indicates an expected call of CreateNewTreeRequest.
+func (mr *MockSyncClientMockRecorder) CreateNewTreeRequest() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateNewTreeRequest", reflect.TypeOf((*MockSyncClient)(nil).CreateNewTreeRequest))
+}
+
+// QueueRequest mocks base method.
+func (m *MockSyncClient) QueueRequest(arg0, arg1 string, arg2 *treechangeproto.TreeSyncMessage) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "QueueRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// QueueRequest indicates an expected call of QueueRequest.
+func (mr *MockSyncClientMockRecorder) QueueRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "QueueRequest", reflect.TypeOf((*MockSyncClient)(nil).QueueRequest), arg0, arg1, arg2)
+}
+
+// SendRequest mocks base method.
+func (m *MockSyncClient) SendRequest(arg0 context.Context, arg1, arg2 string, arg3 *treechangeproto.TreeSyncMessage) (*spacesyncproto.ObjectSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SendRequest", arg0, arg1, arg2, arg3)
+	ret0, _ := ret[0].(*spacesyncproto.ObjectSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// SendRequest indicates an expected call of SendRequest.
+func (mr *MockSyncClientMockRecorder) SendRequest(arg0, arg1, arg2, arg3 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SendRequest", reflect.TypeOf((*MockSyncClient)(nil).SendRequest), arg0, arg1, arg2, arg3)
+}
+
+// SendUpdate mocks base method.
+func (m *MockSyncClient) SendUpdate(arg0, arg1 string, arg2 *treechangeproto.TreeSyncMessage) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SendUpdate", arg0, arg1, arg2)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// SendUpdate indicates an expected call of SendUpdate.
+func (mr *MockSyncClientMockRecorder) SendUpdate(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SendUpdate", reflect.TypeOf((*MockSyncClient)(nil).SendUpdate), arg0, arg1, arg2)
+}
+
+// MockRequestFactory is a mock of RequestFactory interface.
+type MockRequestFactory struct {
+	ctrl     *gomock.Controller
+	recorder *MockRequestFactoryMockRecorder
+}
+
+// MockRequestFactoryMockRecorder is the mock recorder for MockRequestFactory.
+type MockRequestFactoryMockRecorder struct {
+	mock *MockRequestFactory
+}
+
+// NewMockRequestFactory creates a new mock instance.
+func NewMockRequestFactory(ctrl *gomock.Controller) *MockRequestFactory {
+	mock := &MockRequestFactory{ctrl: ctrl}
+	mock.recorder = &MockRequestFactoryMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockRequestFactory) EXPECT() *MockRequestFactoryMockRecorder {
+	return m.recorder
+}
+
+// CreateFullSyncRequest mocks base method.
+func (m *MockRequestFactory) CreateFullSyncRequest(arg0 objecttree.ObjectTree, arg1, arg2 []string) (*treechangeproto.TreeSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncRequest indicates an expected call of CreateFullSyncRequest.
+func (mr *MockRequestFactoryMockRecorder) CreateFullSyncRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncRequest", reflect.TypeOf((*MockRequestFactory)(nil).CreateFullSyncRequest), arg0, arg1, arg2)
+}
+
+// CreateFullSyncResponse mocks base method.
+func (m *MockRequestFactory) CreateFullSyncResponse(arg0 objecttree.ObjectTree, arg1, arg2 []string) (*treechangeproto.TreeSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateFullSyncResponse", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateFullSyncResponse indicates an expected call of CreateFullSyncResponse.
+func (mr *MockRequestFactoryMockRecorder) CreateFullSyncResponse(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncResponse", reflect.TypeOf((*MockRequestFactory)(nil).CreateFullSyncResponse), arg0, arg1, arg2)
+}
+
+// CreateHeadUpdate mocks base method.
+func (m *MockRequestFactory) CreateHeadUpdate(arg0 objecttree.ObjectTree, arg1 []*treechangeproto.RawTreeChangeWithId) *treechangeproto.TreeSyncMessage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateHeadUpdate", arg0, arg1)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	return ret0
+}
+
+// CreateHeadUpdate indicates an expected call of CreateHeadUpdate.
+func (mr *MockRequestFactoryMockRecorder) CreateHeadUpdate(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateHeadUpdate", reflect.TypeOf((*MockRequestFactory)(nil).CreateHeadUpdate), arg0, arg1)
+}
+
+// CreateNewTreeRequest mocks base method.
+func (m *MockRequestFactory) CreateNewTreeRequest() *treechangeproto.TreeSyncMessage {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateNewTreeRequest")
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	return ret0
+}
+
+// CreateNewTreeRequest indicates an expected call of CreateNewTreeRequest.
+func (mr *MockRequestFactoryMockRecorder) CreateNewTreeRequest() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateNewTreeRequest", reflect.TypeOf((*MockRequestFactory)(nil).CreateNewTreeRequest))
+}
+
+// MockTreeSyncProtocol is a mock of TreeSyncProtocol interface.
+type MockTreeSyncProtocol struct {
+	ctrl     *gomock.Controller
+	recorder *MockTreeSyncProtocolMockRecorder
+}
+
+// MockTreeSyncProtocolMockRecorder is the mock recorder for MockTreeSyncProtocol.
+type MockTreeSyncProtocolMockRecorder struct {
+	mock *MockTreeSyncProtocol
+}
+
+// NewMockTreeSyncProtocol creates a new mock instance.
+func NewMockTreeSyncProtocol(ctrl *gomock.Controller) *MockTreeSyncProtocol {
+	mock := &MockTreeSyncProtocol{ctrl: ctrl}
+	mock.recorder = &MockTreeSyncProtocolMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockTreeSyncProtocol) EXPECT() *MockTreeSyncProtocolMockRecorder {
+	return m.recorder
+}
+
+// FullSyncRequest mocks base method.
+func (m *MockTreeSyncProtocol) FullSyncRequest(arg0 context.Context, arg1 string, arg2 *treechangeproto.TreeFullSyncRequest) (*treechangeproto.TreeSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FullSyncRequest", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// FullSyncRequest indicates an expected call of FullSyncRequest.
+func (mr *MockTreeSyncProtocolMockRecorder) FullSyncRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FullSyncRequest", reflect.TypeOf((*MockTreeSyncProtocol)(nil).FullSyncRequest), arg0, arg1, arg2)
+}
+
+// FullSyncResponse mocks base method.
+func (m *MockTreeSyncProtocol) FullSyncResponse(arg0 context.Context, arg1 string, arg2 *treechangeproto.TreeFullSyncResponse) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FullSyncResponse", arg0, arg1, arg2)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// FullSyncResponse indicates an expected call of FullSyncResponse.
+func (mr *MockTreeSyncProtocolMockRecorder) FullSyncResponse(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FullSyncResponse", reflect.TypeOf((*MockTreeSyncProtocol)(nil).FullSyncResponse), arg0, arg1, arg2)
+}
+
+// HeadUpdate mocks base method.
+func (m *MockTreeSyncProtocol) HeadUpdate(arg0 context.Context, arg1 string, arg2 *treechangeproto.TreeHeadUpdate) (*treechangeproto.TreeSyncMessage, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "HeadUpdate", arg0, arg1, arg2)
+	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// HeadUpdate indicates an expected call of HeadUpdate.
+func (mr *MockTreeSyncProtocolMockRecorder) HeadUpdate(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HeadUpdate", reflect.TypeOf((*MockTreeSyncProtocol)(nil).HeadUpdate), arg0, arg1, arg2)
+}

commonspace/object/tree/synctree/protocolintegration_test.go

@@ -2,6 +2,10 @@ package synctree
 
 import (
 	"context"
+	"math/rand"
+	"testing"
+	"time"
+
 	"github.com/anyproto/any-sync/commonspace/object/accountdata"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
@@ -10,9 +14,6 @@ import (
 	"github.com/anyproto/any-sync/util/slice"
 	"github.com/gogo/protobuf/proto"
 	"github.com/stretchr/testify/require"
-	"math/rand"
-	"testing"
-	"time"
 )
 
 func TestEmptyClientGetsFullHistory(t *testing.T) {

commonspace/object/tree/synctree/requestfactory.go

@@ -1,4 +1,4 @@
-package objectsync
+package synctree
 
 import (
 	"fmt"

commonspace/object/tree/synctree/syncclient.go

@@ -0,0 +1,70 @@
+package synctree
+
+import (
+	"context"
+
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/peermanager"
+	"github.com/anyproto/any-sync/commonspace/requestmanager"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"go.uber.org/zap"
+)
+
+type SyncClient interface {
+	RequestFactory
+	Broadcast(msg *treechangeproto.TreeSyncMessage)
+	SendUpdate(peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (err error)
+	QueueRequest(peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (err error)
+	SendRequest(ctx context.Context, peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error)
+}
+
+type syncClient struct {
+	RequestFactory
+	spaceId        string
+	requestManager requestmanager.RequestManager
+	peerManager    peermanager.PeerManager
+}
+
+func NewSyncClient(spaceId string, requestManager requestmanager.RequestManager, peerManager peermanager.PeerManager) SyncClient {
+	return &syncClient{
+		RequestFactory: &requestFactory{},
+		spaceId:        spaceId,
+		requestManager: requestManager,
+		peerManager:    peerManager,
+	}
+}
+
+func (s *syncClient) Broadcast(msg *treechangeproto.TreeSyncMessage) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, msg.RootChange.Id)
+	if err != nil {
+		return
+	}
+	err = s.peerManager.Broadcast(context.Background(), objMsg)
+	if err != nil {
+		log.Debug("broadcast error", zap.Error(err))
+	}
+}
+
+func (s *syncClient) SendUpdate(peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (err error) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, objectId)
+	if err != nil {
+		return
+	}
+	return s.peerManager.SendPeer(context.Background(), peerId, objMsg)
+}
+
+func (s *syncClient) SendRequest(ctx context.Context, peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, objectId)
+	if err != nil {
+		return
+	}
+	return s.requestManager.SendRequest(ctx, peerId, objMsg)
+}
+
+func (s *syncClient) QueueRequest(peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (err error) {
+	objMsg, err := spacesyncproto.MarshallSyncMessage(msg, s.spaceId, objectId)
+	if err != nil {
+		return
+	}
+	return s.requestManager.QueueRequest(peerId, objMsg)
+}

commonspace/object/tree/synctree/synctree.go

@@ -1,4 +1,4 @@
-//go:generate mockgen -destination mock_synctree/mock_synctree.go github.com/anyproto/any-sync/commonspace/object/tree/synctree SyncTree,ReceiveQueue,HeadNotifiable
+//go:generate mockgen -destination mock_synctree/mock_synctree.go github.com/anyproto/any-sync/commonspace/object/tree/synctree SyncTree,ReceiveQueue,HeadNotifiable,SyncClient,RequestFactory,TreeSyncProtocol
 package synctree
 
 import (
@@ -11,7 +11,6 @@ import (
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
-	"github.com/anyproto/any-sync/commonspace/objectsync"
 	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
@@ -44,7 +43,7 @@ type SyncTree interface {
 type syncTree struct {
 	objecttree.ObjectTree
 	synchandler.SyncHandler
-	syncClient objectsync.SyncClient
+	syncClient SyncClient
 	syncStatus syncstatus.StatusUpdater
 	notifiable HeadNotifiable
 	listener   updatelistener.UpdateListener
@@ -60,19 +59,18 @@ type ResponsiblePeersGetter interface {
 }
 
 type BuildDeps struct {
-	SpaceId            string
-	SyncClient         objectsync.SyncClient
-	Configuration      nodeconf.NodeConf
-	HeadNotifiable     HeadNotifiable
-	Listener           updatelistener.UpdateListener
-	AclList            list.AclList
-	SpaceStorage       spacestorage.SpaceStorage
-	TreeStorage        treestorage.TreeStorage
-	OnClose            func(id string)
-	SyncStatus         syncstatus.StatusUpdater
-	PeerGetter         ResponsiblePeersGetter
-	BuildObjectTree    objecttree.BuildObjectTreeFunc
-	WaitTreeRemoteSync bool
+	SpaceId         string
+	SyncClient      SyncClient
+	Configuration   nodeconf.NodeConf
+	HeadNotifiable  HeadNotifiable
+	Listener        updatelistener.UpdateListener
+	AclList         list.AclList
+	SpaceStorage    spacestorage.SpaceStorage
+	TreeStorage     treestorage.TreeStorage
+	OnClose         func(id string)
+	SyncStatus      syncstatus.StatusUpdater
+	PeerGetter      ResponsiblePeersGetter
+	BuildObjectTree objecttree.BuildObjectTreeFunc
 }
 
 func BuildSyncTreeOrGetRemote(ctx context.Context, id string, deps BuildDeps) (t SyncTree, err error) {
@@ -119,7 +117,7 @@ func buildSyncTree(ctx context.Context, sendUpdate bool, deps BuildDeps) (t Sync
 	if sendUpdate {
 		headUpdate := syncTree.syncClient.CreateHeadUpdate(t, nil)
 		// send to everybody, because everybody should know that the node or client got new tree
-		syncTree.syncClient.Broadcast(ctx, headUpdate)
+		syncTree.syncClient.Broadcast(headUpdate)
 	}
 	return
 }
@@ -156,7 +154,7 @@ func (s *syncTree) AddContent(ctx context.Context, content objecttree.SignableCh
 	}
 	s.syncStatus.HeadsChange(s.Id(), res.Heads)
 	headUpdate := s.syncClient.CreateHeadUpdate(s, res.Added)
-	s.syncClient.Broadcast(ctx, headUpdate)
+	s.syncClient.Broadcast(headUpdate)
 	return
 }
 
@@ -183,7 +181,7 @@ func (s *syncTree) AddRawChanges(ctx context.Context, changesPayload objecttree.
 			s.notifiable.UpdateHeads(s.Id(), res.Heads)
 		}
 		headUpdate := s.syncClient.CreateHeadUpdate(s, res.Added)
-		s.syncClient.Broadcast(ctx, headUpdate)
+		s.syncClient.Broadcast(headUpdate)
 	}
 	return
 }
@@ -207,18 +205,27 @@ func (s *syncTree) Delete() (err error) {
 }
 
 func (s *syncTree) TryClose(objectTTL time.Duration) (bool, error) {
-	return true, s.Close()
+	if !s.TryLock() {
+		return false, nil
+	}
+	log.Debug("closing sync tree", zap.String("id", s.Id()))
+	return true, s.close()
 }
 
 func (s *syncTree) Close() (err error) {
 	log.Debug("closing sync tree", zap.String("id", s.Id()))
+	s.Lock()
+	return s.close()
+}
+
+func (s *syncTree) close() (err error) {
+	defer s.Unlock()
 	defer func() {
 		log.Debug("closed sync tree", zap.Error(err), zap.String("id", s.Id()))
 	}()
-	s.Lock()
-	defer s.Unlock()
 	if s.isClosed {
-		return ErrSyncTreeClosed
+		err = ErrSyncTreeClosed
+		return
 	}
 	s.onClose(s.Id())
 	s.isClosed = true
@@ -239,7 +246,7 @@ func (s *syncTree) SyncWithPeer(ctx context.Context, peerId string) (err error)
 	s.Lock()
 	defer s.Unlock()
 	headUpdate := s.syncClient.CreateHeadUpdate(s, nil)
-	return s.syncClient.SendWithReply(ctx, peerId, headUpdate.RootChange.Id, headUpdate, "")
+	return s.syncClient.SendUpdate(peerId, headUpdate.RootChange.Id, headUpdate)
 }
 
 func (s *syncTree) afterBuild() {

commonspace/object/tree/synctree/synctree_test.go

@@ -4,21 +4,21 @@ import (
 	"context"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree/mock_objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/mock_synctree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
 	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener/mock_updatelistener"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/objectsync"
-	"github.com/anyproto/any-sync/commonspace/objectsync/mock_objectsync"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/nodeconf"
-	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
 	"testing"
 )
 
 type syncTreeMatcher struct {
 	objTree  objecttree.ObjectTree
-	client   objectsync.SyncClient
+	client   SyncClient
 	listener updatelistener.UpdateListener
 }
 
@@ -34,8 +34,8 @@ func (s syncTreeMatcher) String() string {
 	return ""
 }
 
-func syncClientFuncCreator(client objectsync.SyncClient) func(spaceId string, factory objectsync.RequestFactory, objectSync objectsync.ObjectSync, configuration nodeconf.NodeConf) objectsync.SyncClient {
-	return func(spaceId string, factory objectsync.RequestFactory, objectSync objectsync.ObjectSync, configuration nodeconf.NodeConf) objectsync.SyncClient {
+func syncClientFuncCreator(client SyncClient) func(spaceId string, factory RequestFactory, objectSync objectsync.ObjectSync, configuration nodeconf.NodeConf) SyncClient {
+	return func(spaceId string, factory RequestFactory, objectSync objectsync.ObjectSync, configuration nodeconf.NodeConf) SyncClient {
 		return client
 	}
 }
@@ -46,7 +46,7 @@ func Test_BuildSyncTree(t *testing.T) {
 	defer ctrl.Finish()
 
 	updateListenerMock := mock_updatelistener.NewMockUpdateListener(ctrl)
-	syncClientMock := mock_objectsync.NewMockSyncClient(ctrl)
+	syncClientMock := mock_synctree.NewMockSyncClient(ctrl)
 	objTreeMock := newTestObjMock(mock_objecttree.NewMockObjectTree(ctrl))
 	tr := &syncTree{
 		ObjectTree:  objTreeMock,
@@ -73,7 +73,7 @@ func Test_BuildSyncTree(t *testing.T) {
 		updateListenerMock.EXPECT().Update(tr)
 
 		syncClientMock.EXPECT().CreateHeadUpdate(gomock.Eq(tr), gomock.Eq(changes)).Return(headUpdate)
-		syncClientMock.EXPECT().Broadcast(gomock.Any(), gomock.Eq(headUpdate))
+		syncClientMock.EXPECT().Broadcast(gomock.Eq(headUpdate))
 		res, err := tr.AddRawChanges(ctx, payload)
 		require.NoError(t, err)
 		require.Equal(t, expectedRes, res)
@@ -95,7 +95,7 @@ func Test_BuildSyncTree(t *testing.T) {
 		updateListenerMock.EXPECT().Rebuild(tr)
 
 		syncClientMock.EXPECT().CreateHeadUpdate(gomock.Eq(tr), gomock.Eq(changes)).Return(headUpdate)
-		syncClientMock.EXPECT().Broadcast(gomock.Any(), gomock.Eq(headUpdate))
+		syncClientMock.EXPECT().Broadcast(gomock.Eq(headUpdate))
 		res, err := tr.AddRawChanges(ctx, payload)
 		require.NoError(t, err)
 		require.Equal(t, expectedRes, res)
@@ -133,7 +133,7 @@ func Test_BuildSyncTree(t *testing.T) {
 			Return(expectedRes, nil)
 
 		syncClientMock.EXPECT().CreateHeadUpdate(gomock.Eq(tr), gomock.Eq(changes)).Return(headUpdate)
-		syncClientMock.EXPECT().Broadcast(gomock.Any(), gomock.Eq(headUpdate))
+		syncClientMock.EXPECT().Broadcast(gomock.Eq(headUpdate))
 		res, err := tr.AddContent(ctx, content)
 		require.NoError(t, err)
 		require.Equal(t, expectedRes, res)

commonspace/object/tree/synctree/synctreehandler.go

@@ -2,233 +2,142 @@ package synctree
 
 import (
 	"context"
+	"errors"
+	"sync"
+
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
-	"github.com/anyproto/any-sync/commonspace/objectsync"
 	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/util/slice"
 	"github.com/gogo/protobuf/proto"
-	"go.uber.org/zap"
-	"sync"
+)
+
+var (
+	ErrMessageIsRequest    = errors.New("message is request")
+	ErrMessageIsNotRequest = errors.New("message is not request")
+	ErrMoreThanOneRequest  = errors.New("more than one request for same peer")
 )
 
 type syncTreeHandler struct {
-	objTree     objecttree.ObjectTree
-	syncClient  objectsync.SyncClient
-	syncStatus  syncstatus.StatusUpdater
-	handlerLock sync.Mutex
-	spaceId     string
-	queue       ReceiveQueue
+	objTree      objecttree.ObjectTree
+	syncClient   SyncClient
+	syncProtocol TreeSyncProtocol
+	syncStatus   syncstatus.StatusUpdater
+	spaceId      string
+
+	handlerLock     sync.Mutex
+	pendingRequests map[string]struct{}
+	heads           []string
 }
 
 const maxQueueSize = 5
 
-func newSyncTreeHandler(spaceId string, objTree objecttree.ObjectTree, syncClient objectsync.SyncClient, syncStatus syncstatus.StatusUpdater) synchandler.SyncHandler {
+func newSyncTreeHandler(spaceId string, objTree objecttree.ObjectTree, syncClient SyncClient, syncStatus syncstatus.StatusUpdater) synchandler.SyncHandler {
 	return &syncTreeHandler{
-		objTree:    objTree,
-		syncClient: syncClient,
-		syncStatus: syncStatus,
-		spaceId:    spaceId,
-		queue:      newReceiveQueue(maxQueueSize),
+		objTree:         objTree,
+		syncProtocol:    newTreeSyncProtocol(spaceId, objTree, syncClient),
+		syncClient:      syncClient,
+		syncStatus:      syncStatus,
+		spaceId:         spaceId,
+		pendingRequests: make(map[string]struct{}),
 	}
 }
 
+func (s *syncTreeHandler) HandleRequest(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (response *spacesyncproto.ObjectSyncMessage, err error) {
+	unmarshalled := &treechangeproto.TreeSyncMessage{}
+	err = proto.Unmarshal(request.Payload, unmarshalled)
+	if err != nil {
+		return
+	}
+	fullSyncRequest := unmarshalled.GetContent().GetFullSyncRequest()
+	if fullSyncRequest == nil {
+		return nil, ErrMessageIsNotRequest
+	}
+	// setting pending requests
+	s.handlerLock.Lock()
+	_, exists := s.pendingRequests[senderId]
+	if exists {
+		s.handlerLock.Unlock()
+		return nil, ErrMoreThanOneRequest
+	}
+	s.pendingRequests[senderId] = struct{}{}
+	s.handlerLock.Unlock()
+
+	response, err = s.handleRequest(ctx, senderId, fullSyncRequest)
+
+	// removing pending requests
+	s.handlerLock.Lock()
+	delete(s.pendingRequests, senderId)
+	s.handlerLock.Unlock()
+	return
+}
+
+func (s *syncTreeHandler) handleRequest(ctx context.Context, senderId string, fullSyncRequest *treechangeproto.TreeFullSyncRequest) (response *spacesyncproto.ObjectSyncMessage, err error) {
+	s.objTree.Lock()
+	defer s.objTree.Unlock()
+	treeResp, err := s.syncProtocol.FullSyncRequest(ctx, senderId, fullSyncRequest)
+	if err != nil {
+		return
+	}
+	response, err = spacesyncproto.MarshallSyncMessage(treeResp, s.spaceId, s.objTree.Id())
+	return
+}
+
 func (s *syncTreeHandler) HandleMessage(ctx context.Context, senderId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
 	unmarshalled := &treechangeproto.TreeSyncMessage{}
 	err = proto.Unmarshal(msg.Payload, unmarshalled)
 	if err != nil {
 		return
 	}
-	s.syncStatus.HeadsReceive(senderId, msg.ObjectId, treechangeproto.GetHeads(unmarshalled))
-
-	queueFull := s.queue.AddMessage(senderId, unmarshalled, msg.RequestId)
-	if queueFull {
+	heads := treechangeproto.GetHeads(unmarshalled)
+	s.syncStatus.HeadsReceive(senderId, msg.ObjectId, heads)
+	s.handlerLock.Lock()
+	// if the update has same heads then returning not to hang on a lock
+	if unmarshalled.GetContent().GetHeadUpdate() != nil && slice.UnsortedEquals(heads, s.heads) {
+		s.handlerLock.Unlock()
 		return
 	}
-
-	return s.handleMessage(ctx, senderId)
+	s.handlerLock.Unlock()
+	return s.handleMessage(ctx, unmarshalled, senderId)
 }
 
-func (s *syncTreeHandler) handleMessage(ctx context.Context, senderId string) (err error) {
+func (s *syncTreeHandler) handleMessage(ctx context.Context, msg *treechangeproto.TreeSyncMessage, senderId string) (err error) {
 	s.objTree.Lock()
 	defer s.objTree.Unlock()
-	msg, replyId, err := s.queue.GetMessage(senderId)
-	if err != nil {
-		return
-	}
-
-	defer s.queue.ClearQueue(senderId)
-
-	content := msg.GetContent()
-	switch {
-	case content.GetHeadUpdate() != nil:
-		return s.handleHeadUpdate(ctx, senderId, content.GetHeadUpdate(), replyId)
-	case content.GetFullSyncRequest() != nil:
-		return s.handleFullSyncRequest(ctx, senderId, content.GetFullSyncRequest(), replyId)
-	case content.GetFullSyncResponse() != nil:
-		return s.handleFullSyncResponse(ctx, senderId, content.GetFullSyncResponse())
-	}
-	return
-}
-
-func (s *syncTreeHandler) handleHeadUpdate(
-	ctx context.Context,
-	senderId string,
-	update *treechangeproto.TreeHeadUpdate,
-	replyId string) (err error) {
 	var (
-		fullRequest   *treechangeproto.TreeSyncMessage
-		isEmptyUpdate = len(update.Changes) == 0
-		objTree       = s.objTree
-		treeId        = objTree.Id()
+		copyHeads = make([]string, 0, len(s.objTree.Heads()))
+		treeId    = s.objTree.Id()
+		content   = msg.GetContent()
 	)
-	log := log.With(
-		zap.Strings("update heads", update.Heads),
-		zap.String("treeId", treeId),
-		zap.String("spaceId", s.spaceId),
-		zap.Int("len(update changes)", len(update.Changes)))
-	log.DebugCtx(ctx, "received head update message")
 
+	// getting old heads
+	copyHeads = append(copyHeads, s.objTree.Heads()...)
 	defer func() {
-		if err != nil {
-			log.ErrorCtx(ctx, "head update finished with error", zap.Error(err))
-		} else if fullRequest != nil {
-			cnt := fullRequest.Content.GetFullSyncRequest()
-			log = log.With(zap.Strings("request heads", cnt.Heads), zap.Int("len(request changes)", len(cnt.Changes)))
-			log.DebugCtx(ctx, "sending full sync request")
-		} else {
-			if !isEmptyUpdate {
-				log.DebugCtx(ctx, "head update finished correctly")
+		// checking if something changed
+		if !slice.UnsortedEquals(copyHeads, s.objTree.Heads()) {
+			s.handlerLock.Lock()
+			defer s.handlerLock.Unlock()
+			s.heads = s.heads[:0]
+			for _, h := range s.objTree.Heads() {
+				s.heads = append(s.heads, h)
 			}
 		}
 	}()
 
-	// isEmptyUpdate is sent when the tree is brought up from cache
-	if isEmptyUpdate {
-		headEquals := slice.UnsortedEquals(objTree.Heads(), update.Heads)
-		log.DebugCtx(ctx, "is empty update", zap.String("treeId", objTree.Id()), zap.Bool("headEquals", headEquals))
-		if headEquals {
+	switch {
+	case content.GetHeadUpdate() != nil:
+		var syncReq *treechangeproto.TreeSyncMessage
+		syncReq, err = s.syncProtocol.HeadUpdate(ctx, senderId, content.GetHeadUpdate())
+		if err != nil || syncReq == nil {
 			return
 		}
-
-		// we need to sync in any case
-		fullRequest, err = s.syncClient.CreateFullSyncRequest(objTree, update.Heads, update.SnapshotPath)
-		if err != nil {
-			return
-		}
-
-		return s.syncClient.SendWithReply(ctx, senderId, treeId, fullRequest, replyId)
+		return s.syncClient.QueueRequest(senderId, treeId, syncReq)
+	case content.GetFullSyncRequest() != nil:
+		return ErrMessageIsRequest
+	case content.GetFullSyncResponse() != nil:
+		return s.syncProtocol.FullSyncResponse(ctx, senderId, content.GetFullSyncResponse())
 	}
-
-	if s.alreadyHasHeads(objTree, update.Heads) {
-		return
-	}
-
-	_, err = objTree.AddRawChanges(ctx, objecttree.RawChangesPayload{
-		NewHeads:   update.Heads,
-		RawChanges: update.Changes,
-	})
-	if err != nil {
-		return
-	}
-
-	if s.alreadyHasHeads(objTree, update.Heads) {
-		return
-	}
-
-	fullRequest, err = s.syncClient.CreateFullSyncRequest(objTree, update.Heads, update.SnapshotPath)
-	if err != nil {
-		return
-	}
-
-	return s.syncClient.SendWithReply(ctx, senderId, treeId, fullRequest, replyId)
-}
-
-func (s *syncTreeHandler) handleFullSyncRequest(
-	ctx context.Context,
-	senderId string,
-	request *treechangeproto.TreeFullSyncRequest,
-	replyId string) (err error) {
-	var (
-		fullResponse *treechangeproto.TreeSyncMessage
-		header       = s.objTree.Header()
-		objTree      = s.objTree
-		treeId       = s.objTree.Id()
-	)
-
-	log := log.With(zap.String("senderId", senderId),
-		zap.Strings("request heads", request.Heads),
-		zap.String("treeId", treeId),
-		zap.String("replyId", replyId),
-		zap.String("spaceId", s.spaceId),
-		zap.Int("len(request changes)", len(request.Changes)))
-	log.DebugCtx(ctx, "received full sync request message")
-
-	defer func() {
-		if err != nil {
-			log.ErrorCtx(ctx, "full sync request finished with error", zap.Error(err))
-			s.syncClient.SendWithReply(ctx, senderId, treeId, treechangeproto.WrapError(treechangeproto.ErrFullSync, header), replyId)
-			return
-		} else if fullResponse != nil {
-			cnt := fullResponse.Content.GetFullSyncResponse()
-			log = log.With(zap.Strings("response heads", cnt.Heads), zap.Int("len(response changes)", len(cnt.Changes)))
-			log.DebugCtx(ctx, "full sync response sent")
-		}
-	}()
-
-	if len(request.Changes) != 0 && !s.alreadyHasHeads(objTree, request.Heads) {
-		_, err = objTree.AddRawChanges(ctx, objecttree.RawChangesPayload{
-			NewHeads:   request.Heads,
-			RawChanges: request.Changes,
-		})
-		if err != nil {
-			return
-		}
-	}
-	fullResponse, err = s.syncClient.CreateFullSyncResponse(objTree, request.Heads, request.SnapshotPath)
-	if err != nil {
-		return
-	}
-
-	return s.syncClient.SendWithReply(ctx, senderId, treeId, fullResponse, replyId)
-}
-
-func (s *syncTreeHandler) handleFullSyncResponse(
-	ctx context.Context,
-	senderId string,
-	response *treechangeproto.TreeFullSyncResponse) (err error) {
-	var (
-		objTree = s.objTree
-		treeId  = s.objTree.Id()
-	)
-	log := log.With(
-		zap.Strings("heads", response.Heads),
-		zap.String("treeId", treeId),
-		zap.String("spaceId", s.spaceId),
-		zap.Int("len(changes)", len(response.Changes)))
-	log.DebugCtx(ctx, "received full sync response message")
-
-	defer func() {
-		if err != nil {
-			log.ErrorCtx(ctx, "full sync response failed", zap.Error(err))
-		} else {
-			log.DebugCtx(ctx, "full sync response succeeded")
-		}
-	}()
-
-	if s.alreadyHasHeads(objTree, response.Heads) {
-		return
-	}
-
-	_, err = objTree.AddRawChanges(ctx, objecttree.RawChangesPayload{
-		NewHeads:   response.Heads,
-		RawChanges: response.Changes,
-	})
 	return
 }
-
-func (s *syncTreeHandler) alreadyHasHeads(t objecttree.ObjectTree, heads []string) bool {
-	return slice.UnsortedEquals(t.Heads(), heads) || t.HasChanges(heads...)
-}

commonspace/object/tree/synctree/synctreehandler_test.go

@@ -2,20 +2,16 @@ package synctree
 
 import (
 	"context"
-	"fmt"
-	"github.com/anyproto/any-sync/commonspace/objectsync"
-	"github.com/anyproto/any-sync/commonspace/objectsync/mock_objectsync"
 	"sync"
 	"testing"
 
-	"github.com/anyproto/any-sync/app/logger"
-	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree/mock_objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/mock_synctree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
-	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
-	"go.uber.org/zap"
+	"go.uber.org/mock/gomock"
 )
 
 type testObjTreeMock struct {
@@ -55,31 +51,40 @@ func (t *testObjTreeMock) TryRLock() bool {
 
 type syncHandlerFixture struct {
 	ctrl             *gomock.Controller
-	syncClientMock   *mock_objectsync.MockSyncClient
+	syncClientMock   *mock_synctree.MockSyncClient
 	objectTreeMock   *testObjTreeMock
-	receiveQueueMock ReceiveQueue
+	syncProtocolMock *mock_synctree.MockTreeSyncProtocol
+	spaceId          string
+	senderId         string
+	treeId           string
 
 	syncHandler *syncTreeHandler
 }
 
 func newSyncHandlerFixture(t *testing.T) *syncHandlerFixture {
 	ctrl := gomock.NewController(t)
-	syncClientMock := mock_objectsync.NewMockSyncClient(ctrl)
 	objectTreeMock := newTestObjMock(mock_objecttree.NewMockObjectTree(ctrl))
-	receiveQueue := newReceiveQueue(5)
+	syncClientMock := mock_synctree.NewMockSyncClient(ctrl)
+	syncProtocolMock := mock_synctree.NewMockTreeSyncProtocol(ctrl)
+	spaceId := "spaceId"
 
 	syncHandler := &syncTreeHandler{
-		objTree:    objectTreeMock,
-		syncClient: syncClientMock,
-		queue:      receiveQueue,
-		syncStatus: syncstatus.NewNoOpSyncStatus(),
+		objTree:         objectTreeMock,
+		syncClient:      syncClientMock,
+		syncProtocol:    syncProtocolMock,
+		spaceId:         spaceId,
+		syncStatus:      syncstatus.NewNoOpSyncStatus(),
+		pendingRequests: map[string]struct{}{},
 	}
 	return &syncHandlerFixture{
 		ctrl:             ctrl,
-		syncClientMock:   syncClientMock,
 		objectTreeMock:   objectTreeMock,
-		receiveQueueMock: receiveQueue,
+		syncProtocolMock: syncProtocolMock,
+		syncClientMock:   syncClientMock,
 		syncHandler:      syncHandler,
+		spaceId:          spaceId,
+		senderId:         "senderId",
+		treeId:           "treeId",
 	}
 }
 
@@ -87,341 +92,149 @@ func (fx *syncHandlerFixture) stop() {
 	fx.ctrl.Finish()
 }
 
-func TestSyncHandler_HandleHeadUpdate(t *testing.T) {
+func TestSyncTreeHandler_HandleMessage(t *testing.T) {
 	ctx := context.Background()
-	log = logger.CtxLogger{Logger: zap.NewNop()}
-	fullRequest := &treechangeproto.TreeSyncMessage{
-		Content: &treechangeproto.TreeSyncContentValue{
-			Value: &treechangeproto.TreeSyncContentValue_FullSyncRequest{
-				FullSyncRequest: &treechangeproto.TreeFullSyncRequest{},
-			},
-		},
-	}
 
-	t.Run("head update non empty all heads added", func(t *testing.T) {
+	t.Run("handle head update message, heads not equal, request returned", func(t *testing.T) {
 		fx := newSyncHandlerFixture(t)
 		defer fx.stop()
 		treeId := "treeId"
-		senderId := "senderId"
 		chWithId := &treechangeproto.RawTreeChangeWithId{}
 		headUpdate := &treechangeproto.TreeHeadUpdate{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
+			Heads: []string{"h3"},
 		}
 		treeMsg := treechangeproto.WrapHeadUpdate(headUpdate, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(treeMsg, "spaceId", treeId)
 
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).Times(2)
-		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
-		fx.objectTreeMock.EXPECT().
-			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
-				NewHeads:   []string{"h1"},
-				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
-			})).
-			Return(objecttree.AddResult{}, nil)
-		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(true)
+		syncReq := &treechangeproto.TreeSyncMessage{}
+		fx.syncHandler.heads = []string{"h2"}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Times(2).Return([]string{"h2"})
+		fx.objectTreeMock.EXPECT().Heads().Times(2).Return([]string{"h3"})
+		fx.syncProtocolMock.EXPECT().HeadUpdate(ctx, fx.senderId, gomock.Any()).Return(syncReq, nil)
+		fx.syncClientMock.EXPECT().QueueRequest(fx.senderId, fx.treeId, syncReq).Return(nil)
 
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
 		require.NoError(t, err)
+		require.Equal(t, []string{"h3"}, fx.syncHandler.heads)
 	})
 
-	t.Run("head update non empty heads not added", func(t *testing.T) {
+	t.Run("handle head update message, heads equal", func(t *testing.T) {
 		fx := newSyncHandlerFixture(t)
 		defer fx.stop()
 		treeId := "treeId"
-		senderId := "senderId"
 		chWithId := &treechangeproto.RawTreeChangeWithId{}
 		headUpdate := &treechangeproto.TreeHeadUpdate{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
+			Heads: []string{"h1"},
 		}
 		treeMsg := treechangeproto.WrapHeadUpdate(headUpdate, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(treeMsg, "spaceId", treeId)
 
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).AnyTimes()
-		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
-		fx.objectTreeMock.EXPECT().
-			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
-				NewHeads:   []string{"h1"},
-				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
-			})).
-			Return(objecttree.AddResult{}, nil)
-		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
-		fx.syncClientMock.EXPECT().
-			CreateFullSyncRequest(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
-			Return(fullRequest, nil)
-		fx.syncClientMock.EXPECT().SendWithReply(gomock.Any(), gomock.Eq(senderId), gomock.Eq(treeId), gomock.Eq(fullRequest), gomock.Eq(""))
+		fx.syncHandler.heads = []string{"h1"}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
 
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
 		require.NoError(t, err)
 	})
 
-	t.Run("head update non empty equal heads", func(t *testing.T) {
+	t.Run("handle head update message, no sync request returned", func(t *testing.T) {
 		fx := newSyncHandlerFixture(t)
 		defer fx.stop()
 		treeId := "treeId"
-		senderId := "senderId"
 		chWithId := &treechangeproto.RawTreeChangeWithId{}
 		headUpdate := &treechangeproto.TreeHeadUpdate{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
+			Heads: []string{"h3"},
 		}
 		treeMsg := treechangeproto.WrapHeadUpdate(headUpdate, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(treeMsg, "spaceId", treeId)
 
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h1"}).AnyTimes()
+		fx.syncHandler.heads = []string{"h2"}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Times(2).Return([]string{"h2"})
+		fx.objectTreeMock.EXPECT().Heads().Times(2).Return([]string{"h3"})
+		fx.syncProtocolMock.EXPECT().HeadUpdate(ctx, fx.senderId, gomock.Any()).Return(nil, nil)
 
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
 		require.NoError(t, err)
+		require.Equal(t, []string{"h3"}, fx.syncHandler.heads)
 	})
 
-	t.Run("head update empty", func(t *testing.T) {
+	t.Run("handle full sync request returns error", func(t *testing.T) {
 		fx := newSyncHandlerFixture(t)
 		defer fx.stop()
 		treeId := "treeId"
-		senderId := "senderId"
 		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		headUpdate := &treechangeproto.TreeHeadUpdate{
-			Heads:        []string{"h1"},
-			Changes:      nil,
-			SnapshotPath: []string{"h1"},
+		fullRequest := &treechangeproto.TreeFullSyncRequest{
+			Heads: []string{"h3"},
 		}
-		treeMsg := treechangeproto.WrapHeadUpdate(headUpdate, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
+		treeMsg := treechangeproto.WrapFullRequest(fullRequest, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(treeMsg, "spaceId", treeId)
 
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).AnyTimes()
-		fx.syncClientMock.EXPECT().
-			CreateFullSyncRequest(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
-			Return(fullRequest, nil)
-		fx.syncClientMock.EXPECT().SendWithReply(gomock.Any(), gomock.Eq(senderId), gomock.Eq(treeId), gomock.Eq(fullRequest), gomock.Eq(""))
+		fx.syncHandler.heads = []string{"h2"}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Times(3).Return([]string{"h2"})
 
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.NoError(t, err)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
+		require.Equal(t, err, ErrMessageIsRequest)
 	})
 
-	t.Run("head update empty equal heads", func(t *testing.T) {
+	t.Run("handle full sync response", func(t *testing.T) {
 		fx := newSyncHandlerFixture(t)
 		defer fx.stop()
 		treeId := "treeId"
-		senderId := "senderId"
-		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		headUpdate := &treechangeproto.TreeHeadUpdate{
-			Heads:        []string{"h1"},
-			Changes:      nil,
-			SnapshotPath: []string{"h1"},
-		}
-		treeMsg := treechangeproto.WrapHeadUpdate(headUpdate, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
-
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h1"}).AnyTimes()
-
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.NoError(t, err)
-	})
-}
-
-func TestSyncHandler_HandleFullSyncRequest(t *testing.T) {
-	ctx := context.Background()
-	log = logger.CtxLogger{Logger: zap.NewNop()}
-	fullResponse := &treechangeproto.TreeSyncMessage{
-		Content: &treechangeproto.TreeSyncContentValue{
-			Value: &treechangeproto.TreeSyncContentValue_FullSyncResponse{
-				FullSyncResponse: &treechangeproto.TreeFullSyncResponse{},
-			},
-		},
-	}
-
-	t.Run("full sync request with change", func(t *testing.T) {
-		fx := newSyncHandlerFixture(t)
-		defer fx.stop()
-		treeId := "treeId"
-		senderId := "senderId"
-		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
-		}
-		treeMsg := treechangeproto.WrapFullRequest(fullSyncRequest, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
-
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Header().Return(nil)
-		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).AnyTimes()
-		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
-		fx.objectTreeMock.EXPECT().
-			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
-				NewHeads:   []string{"h1"},
-				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
-			})).
-			Return(objecttree.AddResult{}, nil)
-		fx.syncClientMock.EXPECT().
-			CreateFullSyncResponse(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
-			Return(fullResponse, nil)
-		fx.syncClientMock.EXPECT().SendWithReply(gomock.Any(), gomock.Eq(senderId), gomock.Eq(treeId), gomock.Eq(fullResponse), gomock.Eq(""))
-
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.NoError(t, err)
-	})
-
-	t.Run("full sync request with change same heads", func(t *testing.T) {
-		fx := newSyncHandlerFixture(t)
-		defer fx.stop()
-		treeId := "treeId"
-		senderId := "senderId"
-		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
-		}
-		treeMsg := treechangeproto.WrapFullRequest(fullSyncRequest, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
-
-		fx.objectTreeMock.EXPECT().
-			Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Header().Return(nil)
-		fx.objectTreeMock.EXPECT().
-			Heads().
-			Return([]string{"h1"}).AnyTimes()
-		fx.syncClientMock.EXPECT().
-			CreateFullSyncResponse(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
-			Return(fullResponse, nil)
-		fx.syncClientMock.EXPECT().SendWithReply(gomock.Any(), gomock.Eq(senderId), gomock.Eq(treeId), gomock.Eq(fullResponse), gomock.Eq(""))
-
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.NoError(t, err)
-	})
-
-	t.Run("full sync request without change but with reply id", func(t *testing.T) {
-		fx := newSyncHandlerFixture(t)
-		defer fx.stop()
-		treeId := "treeId"
-		senderId := "senderId"
-		replyId := "replyId"
-		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
-			Heads:        []string{"h1"},
-			SnapshotPath: []string{"h1"},
-		}
-		treeMsg := treechangeproto.WrapFullRequest(fullSyncRequest, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
-		objectMsg.RequestId = replyId
-
-		fx.objectTreeMock.EXPECT().
-			Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Header().Return(nil)
-		fx.syncClientMock.EXPECT().
-			CreateFullSyncResponse(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
-			Return(fullResponse, nil)
-		fx.syncClientMock.EXPECT().SendWithReply(gomock.Any(), gomock.Eq(senderId), gomock.Eq(treeId), gomock.Eq(fullResponse), gomock.Eq(replyId))
-
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.NoError(t, err)
-	})
-
-	t.Run("full sync request with add raw changes error", func(t *testing.T) {
-		fx := newSyncHandlerFixture(t)
-		defer fx.stop()
-		treeId := "treeId"
-		senderId := "senderId"
-		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
-		}
-		treeMsg := treechangeproto.WrapFullRequest(fullSyncRequest, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, "")
-
-		fx.objectTreeMock.EXPECT().
-			Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().Header().Return(nil)
-		fx.objectTreeMock.EXPECT().
-			Heads().
-			Return([]string{"h2"})
-		fx.objectTreeMock.EXPECT().
-			HasChanges(gomock.Eq([]string{"h1"})).
-			Return(false)
-		fx.objectTreeMock.EXPECT().
-			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
-				NewHeads:   []string{"h1"},
-				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
-			})).
-			Return(objecttree.AddResult{}, fmt.Errorf(""))
-		fx.syncClientMock.EXPECT().SendWithReply(gomock.Any(), gomock.Eq(senderId), gomock.Eq(treeId), gomock.Any(), gomock.Eq(""))
-
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.Error(t, err)
-	})
-}
-
-func TestSyncHandler_HandleFullSyncResponse(t *testing.T) {
-	ctx := context.Background()
-	log = logger.CtxLogger{Logger: zap.NewNop()}
-
-	t.Run("full sync response with change", func(t *testing.T) {
-		fx := newSyncHandlerFixture(t)
-		defer fx.stop()
-		treeId := "treeId"
-		senderId := "senderId"
-		replyId := "replyId"
 		chWithId := &treechangeproto.RawTreeChangeWithId{}
 		fullSyncResponse := &treechangeproto.TreeFullSyncResponse{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
+			Heads: []string{"h3"},
 		}
 		treeMsg := treechangeproto.WrapFullResponse(fullSyncResponse, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, replyId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(treeMsg, "spaceId", treeId)
 
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().
-			Heads().
-			Return([]string{"h2"}).AnyTimes()
-		fx.objectTreeMock.EXPECT().
-			HasChanges(gomock.Eq([]string{"h1"})).
-			Return(false)
-		fx.objectTreeMock.EXPECT().
-			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
-				NewHeads:   []string{"h1"},
-				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
-			})).
-			Return(objecttree.AddResult{}, nil)
+		fx.syncHandler.heads = []string{"h2"}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Times(2).Return([]string{"h2"})
+		fx.objectTreeMock.EXPECT().Heads().Times(2).Return([]string{"h3"})
+		fx.syncProtocolMock.EXPECT().FullSyncResponse(ctx, fx.senderId, gomock.Any()).Return(nil)
 
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
-		require.NoError(t, err)
-	})
-
-	t.Run("full sync response with same heads", func(t *testing.T) {
-		fx := newSyncHandlerFixture(t)
-		defer fx.stop()
-		treeId := "treeId"
-		senderId := "senderId"
-		replyId := "replyId"
-		chWithId := &treechangeproto.RawTreeChangeWithId{}
-		fullSyncResponse := &treechangeproto.TreeFullSyncResponse{
-			Heads:        []string{"h1"},
-			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
-			SnapshotPath: []string{"h1"},
-		}
-		treeMsg := treechangeproto.WrapFullResponse(fullSyncResponse, chWithId)
-		objectMsg, _ := objectsync.MarshallTreeMessage(treeMsg, "spaceId", treeId, replyId)
-
-		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(treeId)
-		fx.objectTreeMock.EXPECT().
-			Heads().
-			Return([]string{"h1"}).AnyTimes()
-
-		err := fx.syncHandler.HandleMessage(ctx, senderId, objectMsg)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, objectMsg)
 		require.NoError(t, err)
 	})
 }
+
+func TestSyncTreeHandler_HandleRequest(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("handle request", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		treeId := "treeId"
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullRequest := &treechangeproto.TreeFullSyncRequest{}
+		treeMsg := treechangeproto.WrapFullRequest(fullRequest, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(treeMsg, "spaceId", treeId)
+
+		syncResp := &treechangeproto.TreeSyncMessage{}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.syncProtocolMock.EXPECT().FullSyncRequest(ctx, fx.senderId, gomock.Any()).Return(syncResp, nil)
+
+		res, err := fx.syncHandler.HandleRequest(ctx, fx.senderId, objectMsg)
+		require.NoError(t, err)
+		require.NotNil(t, res)
+	})
+
+	t.Run("handle other message", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		treeId := "treeId"
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullResponse := &treechangeproto.TreeFullSyncResponse{}
+		responseMsg := treechangeproto.WrapFullResponse(fullResponse, chWithId)
+		headUpdate := &treechangeproto.TreeHeadUpdate{}
+		headUpdateMsg := treechangeproto.WrapHeadUpdate(headUpdate, chWithId)
+		for _, msg := range []*treechangeproto.TreeSyncMessage{responseMsg, headUpdateMsg} {
+			objectMsg, _ := spacesyncproto.MarshallSyncMessage(msg, "spaceId", treeId)
+
+			_, err := fx.syncHandler.HandleRequest(ctx, fx.senderId, objectMsg)
+			require.Equal(t, err, ErrMessageIsNotRequest)
+		}
+	})
+}

commonspace/object/tree/synctree/treeremotegetter.go

@@ -2,16 +2,19 @@ package synctree
 
 import (
 	"context"
-	"fmt"
+	"errors"
+
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/net/peer"
-	"github.com/anyproto/any-sync/net/rpc/rpcerr"
 	"github.com/gogo/protobuf/proto"
 	"go.uber.org/zap"
-	"time"
+)
+
+var (
+	ErrNoResponsiblePeers = errors.New("no responsible peers")
 )
 
 type treeRemoteGetter struct {
@@ -36,7 +39,7 @@ func (t treeRemoteGetter) getPeers(ctx context.Context) (peerIds []string, err e
 		return
 	}
 	if len(respPeers) == 0 {
-		err = fmt.Errorf("no responsible peers")
+		err = ErrNoResponsiblePeers
 		return
 	}
 	for _, p := range respPeers {
@@ -47,7 +50,7 @@ func (t treeRemoteGetter) getPeers(ctx context.Context) (peerIds []string, err e
 
 func (t treeRemoteGetter) treeRequest(ctx context.Context, peerId string) (msg *treechangeproto.TreeSyncMessage, err error) {
 	newTreeRequest := t.deps.SyncClient.CreateNewTreeRequest()
-	resp, err := t.deps.SyncClient.SendSync(ctx, peerId, t.treeId, newTreeRequest)
+	resp, err := t.deps.SyncClient.SendRequest(ctx, peerId, t.treeId, newTreeRequest)
 	if err != nil {
 		return
 	}
@@ -57,37 +60,13 @@ func (t treeRemoteGetter) treeRequest(ctx context.Context, peerId string) (msg *
 	return
 }
 
-func (t treeRemoteGetter) treeRequestLoop(ctx context.Context, wait bool) (msg *treechangeproto.TreeSyncMessage, err error) {
-	peerIdx := 0
-Loop:
-	for {
-		select {
-		case <-ctx.Done():
-			return nil, fmt.Errorf("waiting for object %s interrupted, context closed", t.treeId)
-		default:
-			break
-		}
-		availablePeers, err := t.getPeers(ctx)
-		if err != nil {
-			if !wait {
-				return nil, err
-			}
-			select {
-			// wait for peers to connect
-			case <-time.After(1 * time.Second):
-				continue Loop
-			case <-ctx.Done():
-				return nil, fmt.Errorf("waiting for object %s interrupted, context closed", t.treeId)
-			}
-		}
-
-		peerIdx = peerIdx % len(availablePeers)
-		msg, err = t.treeRequest(ctx, availablePeers[peerIdx])
-		if err == nil || !wait {
-			return msg, err
-		}
-		peerIdx++
+func (t treeRemoteGetter) treeRequestLoop(ctx context.Context) (msg *treechangeproto.TreeSyncMessage, err error) {
+	availablePeers, err := t.getPeers(ctx)
+	if err != nil {
+		return
 	}
+	// in future we will try to load from different peers
+	return t.treeRequest(ctx, availablePeers[0])
 }
 
 func (t treeRemoteGetter) getTree(ctx context.Context) (treeStorage treestorage.TreeStorage, isRemote bool, err error) {
@@ -109,22 +88,15 @@ func (t treeRemoteGetter) getTree(ctx context.Context) (treeStorage treestorage.
 	}
 
 	isRemote = true
-	resp, err := t.treeRequestLoop(ctx, t.deps.WaitTreeRemoteSync)
+	resp, err := t.treeRequestLoop(ctx)
 	if err != nil {
 		return
 	}
-	switch {
-	case resp.GetContent().GetErrorResponse() != nil:
-		errResp := resp.GetContent().GetErrorResponse()
-		err = rpcerr.Err(errResp.ErrCode)
-		return
-	case resp.GetContent().GetFullSyncResponse() == nil:
+	fullSyncResp := resp.GetContent().GetFullSyncResponse()
+	if fullSyncResp == nil {
 		err = treechangeproto.ErrUnexpected
 		return
-	default:
-		break
 	}
-	fullSyncResp := resp.GetContent().GetFullSyncResponse()
 
 	payload := treestorage.TreeStorageCreatePayload{
 		RootRawChange: resp.RootChange,

commonspace/object/tree/synctree/treeremotegetter_test.go

@@ -0,0 +1,87 @@
+package synctree
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/mock_synctree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/peermanager/mock_peermanager"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/net/peer"
+	"github.com/anyproto/any-sync/net/peer/mock_peer"
+	"github.com/gogo/protobuf/proto"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+)
+
+type treeRemoteGetterFixture struct {
+	ctrl *gomock.Controller
+
+	treeGetter     treeRemoteGetter
+	syncClientMock *mock_synctree.MockSyncClient
+	peerGetterMock *mock_peermanager.MockPeerManager
+}
+
+func newTreeRemoteGetterFixture(t *testing.T) *treeRemoteGetterFixture {
+	ctrl := gomock.NewController(t)
+	syncClientMock := mock_synctree.NewMockSyncClient(ctrl)
+	peerGetterMock := mock_peermanager.NewMockPeerManager(ctrl)
+	treeGetter := treeRemoteGetter{
+		deps: BuildDeps{
+			SyncClient: syncClientMock,
+			PeerGetter: peerGetterMock,
+		},
+		treeId: "treeId",
+	}
+	return &treeRemoteGetterFixture{
+		ctrl:           ctrl,
+		treeGetter:     treeGetter,
+		syncClientMock: syncClientMock,
+		peerGetterMock: peerGetterMock,
+	}
+}
+
+func (fx *treeRemoteGetterFixture) stop() {
+	fx.ctrl.Finish()
+}
+
+func TestTreeRemoteGetter(t *testing.T) {
+	ctx := context.Background()
+	peerId := "peerId"
+	treeRequest := &treechangeproto.TreeSyncMessage{}
+	treeResponse := &treechangeproto.TreeSyncMessage{
+		RootChange: &treechangeproto.RawTreeChangeWithId{Id: "id"},
+	}
+	marshalled, _ := proto.Marshal(treeResponse)
+	objectResponse := &spacesyncproto.ObjectSyncMessage{
+		Payload: marshalled,
+	}
+
+	t.Run("request works", func(t *testing.T) {
+		fx := newTreeRemoteGetterFixture(t)
+		defer fx.stop()
+		mockPeer := mock_peer.NewMockPeer(fx.ctrl)
+		mockPeer.EXPECT().Id().AnyTimes().Return(peerId)
+		fx.peerGetterMock.EXPECT().GetResponsiblePeers(ctx).Return([]peer.Peer{mockPeer}, nil)
+		fx.syncClientMock.EXPECT().CreateNewTreeRequest().Return(treeRequest)
+		fx.syncClientMock.EXPECT().SendRequest(ctx, peerId, fx.treeGetter.treeId, treeRequest).Return(objectResponse, nil)
+		resp, err := fx.treeGetter.treeRequestLoop(ctx)
+		require.NoError(t, err)
+		require.Equal(t, "id", resp.RootChange.Id)
+	})
+
+	t.Run("request fails", func(t *testing.T) {
+		fx := newTreeRemoteGetterFixture(t)
+		defer fx.stop()
+		treeRequest := &treechangeproto.TreeSyncMessage{}
+		mockPeer := mock_peer.NewMockPeer(fx.ctrl)
+		mockPeer.EXPECT().Id().AnyTimes().Return(peerId)
+		fx.peerGetterMock.EXPECT().GetResponsiblePeers(ctx).Return([]peer.Peer{mockPeer}, nil)
+		fx.syncClientMock.EXPECT().CreateNewTreeRequest().Return(treeRequest)
+		fx.syncClientMock.EXPECT().SendRequest(ctx, peerId, fx.treeGetter.treeId, treeRequest).AnyTimes().Return(nil, fmt.Errorf("some"))
+		_, err := fx.treeGetter.treeRequestLoop(ctx)
+		require.Error(t, err)
+	})
+}

commonspace/object/tree/synctree/treesyncprotocol.go

@@ -0,0 +1,153 @@
+package synctree
+
+import (
+	"context"
+
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/util/slice"
+	"go.uber.org/zap"
+)
+
+type TreeSyncProtocol interface {
+	HeadUpdate(ctx context.Context, senderId string, update *treechangeproto.TreeHeadUpdate) (request *treechangeproto.TreeSyncMessage, err error)
+	FullSyncRequest(ctx context.Context, senderId string, request *treechangeproto.TreeFullSyncRequest) (response *treechangeproto.TreeSyncMessage, err error)
+	FullSyncResponse(ctx context.Context, senderId string, response *treechangeproto.TreeFullSyncResponse) (err error)
+}
+
+type treeSyncProtocol struct {
+	log        logger.CtxLogger
+	spaceId    string
+	objTree    objecttree.ObjectTree
+	reqFactory RequestFactory
+}
+
+func newTreeSyncProtocol(spaceId string, objTree objecttree.ObjectTree, reqFactory RequestFactory) *treeSyncProtocol {
+	return &treeSyncProtocol{
+		log:        log.With(zap.String("spaceId", spaceId), zap.String("treeId", objTree.Id())),
+		spaceId:    spaceId,
+		objTree:    objTree,
+		reqFactory: reqFactory,
+	}
+}
+
+func (t *treeSyncProtocol) HeadUpdate(ctx context.Context, senderId string, update *treechangeproto.TreeHeadUpdate) (fullRequest *treechangeproto.TreeSyncMessage, err error) {
+	var (
+		isEmptyUpdate = len(update.Changes) == 0
+		objTree       = t.objTree
+	)
+	log := t.log.With(
+		zap.String("senderId", senderId),
+		zap.Strings("update heads", update.Heads),
+		zap.Int("len(update changes)", len(update.Changes)))
+	log.DebugCtx(ctx, "received head update message")
+
+	defer func() {
+		if err != nil {
+			log.ErrorCtx(ctx, "head update finished with error", zap.Error(err))
+		} else if fullRequest != nil {
+			cnt := fullRequest.Content.GetFullSyncRequest()
+			log = log.With(zap.Strings("request heads", cnt.Heads), zap.Int("len(request changes)", len(cnt.Changes)))
+			log.DebugCtx(ctx, "returning full sync request")
+		} else {
+			if !isEmptyUpdate {
+				log.DebugCtx(ctx, "head update finished correctly")
+			}
+		}
+	}()
+
+	// isEmptyUpdate is sent when the tree is brought up from cache
+	if isEmptyUpdate {
+		headEquals := slice.UnsortedEquals(objTree.Heads(), update.Heads)
+		log.DebugCtx(ctx, "is empty update", zap.Bool("headEquals", headEquals))
+		if headEquals {
+			return
+		}
+
+		// we need to sync in any case
+		fullRequest, err = t.reqFactory.CreateFullSyncRequest(objTree, update.Heads, update.SnapshotPath)
+		return
+	}
+
+	if t.hasHeads(objTree, update.Heads) {
+		return
+	}
+
+	_, err = objTree.AddRawChanges(ctx, objecttree.RawChangesPayload{
+		NewHeads:   update.Heads,
+		RawChanges: update.Changes,
+	})
+	if err != nil {
+		return
+	}
+
+	if t.hasHeads(objTree, update.Heads) {
+		return
+	}
+
+	fullRequest, err = t.reqFactory.CreateFullSyncRequest(objTree, update.Heads, update.SnapshotPath)
+	return
+}
+
+func (t *treeSyncProtocol) FullSyncRequest(ctx context.Context, senderId string, request *treechangeproto.TreeFullSyncRequest) (fullResponse *treechangeproto.TreeSyncMessage, err error) {
+	var (
+		objTree = t.objTree
+	)
+	log := t.log.With(zap.String("senderId", senderId),
+		zap.Strings("request heads", request.Heads),
+		zap.Int("len(request changes)", len(request.Changes)))
+	log.DebugCtx(ctx, "received full sync request message")
+
+	defer func() {
+		if err != nil {
+			log.ErrorCtx(ctx, "full sync request finished with error", zap.Error(err))
+		} else if fullResponse != nil {
+			cnt := fullResponse.Content.GetFullSyncResponse()
+			log = log.With(zap.Strings("response heads", cnt.Heads), zap.Int("len(response changes)", len(cnt.Changes)))
+			log.DebugCtx(ctx, "full sync response sent")
+		}
+	}()
+
+	if len(request.Changes) != 0 && !t.hasHeads(objTree, request.Heads) {
+		_, err = objTree.AddRawChanges(ctx, objecttree.RawChangesPayload{
+			NewHeads:   request.Heads,
+			RawChanges: request.Changes,
+		})
+		if err != nil {
+			return
+		}
+	}
+	fullResponse, err = t.reqFactory.CreateFullSyncResponse(objTree, request.Heads, request.SnapshotPath)
+	return
+}
+
+func (t *treeSyncProtocol) FullSyncResponse(ctx context.Context, senderId string, response *treechangeproto.TreeFullSyncResponse) (err error) {
+	var (
+		objTree = t.objTree
+	)
+	log := log.With(
+		zap.Strings("heads", response.Heads),
+		zap.Int("len(changes)", len(response.Changes)))
+	log.DebugCtx(ctx, "received full sync response message")
+	defer func() {
+		if err != nil {
+			log.ErrorCtx(ctx, "full sync response failed", zap.Error(err))
+		} else {
+			log.DebugCtx(ctx, "full sync response succeeded")
+		}
+	}()
+	if t.hasHeads(objTree, response.Heads) {
+		return
+	}
+
+	_, err = objTree.AddRawChanges(ctx, objecttree.RawChangesPayload{
+		NewHeads:   response.Heads,
+		RawChanges: response.Changes,
+	})
+	return
+}
+
+func (t *treeSyncProtocol) hasHeads(ot objecttree.ObjectTree, heads []string) bool {
+	return slice.UnsortedEquals(ot.Heads(), heads) || ot.HasChanges(heads...)
+}

commonspace/object/tree/synctree/treesyncprotocol_test.go

@@ -0,0 +1,293 @@
+package synctree
+
+import (
+	"context"
+	"fmt"
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree/mock_objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/mock_synctree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+	"testing"
+)
+
+type treeSyncProtocolFixture struct {
+	log            logger.CtxLogger
+	spaceId        string
+	senderId       string
+	treeId         string
+	objectTreeMock *testObjTreeMock
+	reqFactory     *mock_synctree.MockRequestFactory
+	ctrl           *gomock.Controller
+	syncProtocol   TreeSyncProtocol
+}
+
+func newSyncProtocolFixture(t *testing.T) *treeSyncProtocolFixture {
+	ctrl := gomock.NewController(t)
+	objTree := &testObjTreeMock{
+		MockObjectTree: mock_objecttree.NewMockObjectTree(ctrl),
+	}
+	spaceId := "spaceId"
+	reqFactory := mock_synctree.NewMockRequestFactory(ctrl)
+	objTree.EXPECT().Id().Return("treeId")
+	syncProtocol := newTreeSyncProtocol(spaceId, objTree, reqFactory)
+	return &treeSyncProtocolFixture{
+		log:            log,
+		spaceId:        spaceId,
+		senderId:       "senderId",
+		treeId:         "treeId",
+		objectTreeMock: objTree,
+		reqFactory:     reqFactory,
+		ctrl:           ctrl,
+		syncProtocol:   syncProtocol,
+	}
+}
+
+func (fx *treeSyncProtocolFixture) stop() {
+	fx.ctrl.Finish()
+}
+
+func TestTreeSyncProtocol_HeadUpdate(t *testing.T) {
+	ctx := context.Background()
+	fullRequest := &treechangeproto.TreeSyncMessage{
+		Content: &treechangeproto.TreeSyncContentValue{
+			Value: &treechangeproto.TreeSyncContentValue_FullSyncRequest{
+				FullSyncRequest: &treechangeproto.TreeFullSyncRequest{},
+			},
+		},
+	}
+
+	t.Run("head update non empty all heads added", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		headUpdate := &treechangeproto.TreeHeadUpdate{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).Times(2)
+		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
+		fx.objectTreeMock.EXPECT().
+			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
+				NewHeads:   []string{"h1"},
+				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
+			})).
+			Return(objecttree.AddResult{}, nil)
+		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(true)
+
+		res, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.NoError(t, err)
+		require.Nil(t, res)
+	})
+
+	t.Run("head update non empty equal heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		headUpdate := &treechangeproto.TreeHeadUpdate{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h1"}).AnyTimes()
+
+		res, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.NoError(t, err)
+		require.Nil(t, res)
+	})
+
+	t.Run("head update empty", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		headUpdate := &treechangeproto.TreeHeadUpdate{
+			Heads:        []string{"h1"},
+			Changes:      nil,
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).AnyTimes()
+		fx.reqFactory.EXPECT().
+			CreateFullSyncRequest(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
+			Return(fullRequest, nil)
+
+		res, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.NoError(t, err)
+		require.Equal(t, fullRequest, res)
+	})
+
+	t.Run("head update empty equal heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		headUpdate := &treechangeproto.TreeHeadUpdate{
+			Heads:        []string{"h1"},
+			Changes:      nil,
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h1"}).AnyTimes()
+
+		res, err := fx.syncProtocol.HeadUpdate(ctx, fx.senderId, headUpdate)
+		require.NoError(t, err)
+		require.Nil(t, res)
+	})
+}
+
+func TestTreeSyncProtocol_FullSyncRequest(t *testing.T) {
+	ctx := context.Background()
+	fullResponse := &treechangeproto.TreeSyncMessage{
+		Content: &treechangeproto.TreeSyncContentValue{
+			Value: &treechangeproto.TreeSyncContentValue_FullSyncResponse{
+				FullSyncResponse: &treechangeproto.TreeFullSyncResponse{},
+			},
+		},
+	}
+
+	t.Run("full sync request with change", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).AnyTimes()
+		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
+		fx.objectTreeMock.EXPECT().
+			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
+				NewHeads:   []string{"h1"},
+				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
+			})).
+			Return(objecttree.AddResult{}, nil)
+		fx.reqFactory.EXPECT().
+			CreateFullSyncResponse(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
+			Return(fullResponse, nil)
+
+		res, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullSyncRequest)
+		require.NoError(t, err)
+		require.Equal(t, fullResponse, res)
+	})
+
+	t.Run("full sync request with change same heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().
+			Heads().
+			Return([]string{"h1"}).AnyTimes()
+		fx.reqFactory.EXPECT().
+			CreateFullSyncResponse(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
+			Return(fullResponse, nil)
+
+		res, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullSyncRequest)
+		require.NoError(t, err)
+		require.Equal(t, fullResponse, res)
+	})
+
+	t.Run("full sync request without changes", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
+			Heads:        []string{"h1"},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.reqFactory.EXPECT().
+			CreateFullSyncResponse(gomock.Eq(fx.objectTreeMock), gomock.Eq([]string{"h1"}), gomock.Eq([]string{"h1"})).
+			Return(fullResponse, nil)
+
+		res, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullSyncRequest)
+		require.NoError(t, err)
+		require.Equal(t, fullResponse, res)
+	})
+
+	t.Run("full sync request with change, raw changes error", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullSyncRequest := &treechangeproto.TreeFullSyncRequest{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Heads().Return([]string{"h2"}).AnyTimes()
+		fx.objectTreeMock.EXPECT().HasChanges(gomock.Eq([]string{"h1"})).Return(false)
+		fx.objectTreeMock.EXPECT().
+			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
+				NewHeads:   []string{"h1"},
+				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
+			})).
+			Return(objecttree.AddResult{}, fmt.Errorf("addRawChanges error"))
+
+		_, err := fx.syncProtocol.FullSyncRequest(ctx, fx.senderId, fullSyncRequest)
+		require.Error(t, err)
+	})
+}
+
+func TestTreeSyncProtocol_FullSyncResponse(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("full sync response with change", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullSyncResponse := &treechangeproto.TreeFullSyncResponse{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().
+			Heads().
+			Return([]string{"h2"}).AnyTimes()
+		fx.objectTreeMock.EXPECT().
+			HasChanges(gomock.Eq([]string{"h1"})).
+			Return(false)
+		fx.objectTreeMock.EXPECT().
+			AddRawChanges(gomock.Any(), gomock.Eq(objecttree.RawChangesPayload{
+				NewHeads:   []string{"h1"},
+				RawChanges: []*treechangeproto.RawTreeChangeWithId{chWithId},
+			})).
+			Return(objecttree.AddResult{}, nil)
+
+		err := fx.syncProtocol.FullSyncResponse(ctx, fx.senderId, fullSyncResponse)
+		require.NoError(t, err)
+	})
+
+	t.Run("full sync response with same heads", func(t *testing.T) {
+		fx := newSyncProtocolFixture(t)
+		defer fx.stop()
+		chWithId := &treechangeproto.RawTreeChangeWithId{}
+		fullSyncResponse := &treechangeproto.TreeFullSyncResponse{
+			Heads:        []string{"h1"},
+			Changes:      []*treechangeproto.RawTreeChangeWithId{chWithId},
+			SnapshotPath: []string{"h1"},
+		}
+
+		fx.objectTreeMock.EXPECT().Id().AnyTimes().Return(fx.treeId)
+		fx.objectTreeMock.EXPECT().
+			Heads().
+			Return([]string{"h1"}).AnyTimes()
+
+		err := fx.syncProtocol.FullSyncResponse(ctx, fx.senderId, fullSyncResponse)
+		require.NoError(t, err)
+	})
+}

commonspace/object/tree/synctree/updatelistener/mock_updatelistener/mock_updatelistener.go

@@ -8,7 +8,7 @@ import (
 	reflect "reflect"
 
 	objecttree "github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockUpdateListener is a mock of UpdateListener interface.

commonspace/object/tree/synctree/utils_test.go

@@ -3,11 +3,11 @@ package synctree
 import (
 	"context"
 	"fmt"
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
-	"github.com/anyproto/any-sync/commonspace/objectsync"
 	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
@@ -82,51 +82,128 @@ func (m *messageLog) addMessage(msg protocolMsg) {
 	m.batcher.Add(context.Background(), msg)
 }
 
+type requestPeerManager struct {
+	peerId   string
+	handlers map[string]*testSyncHandler
+	log      *messageLog
+}
+
+func newRequestPeerManager(peerId string, log *messageLog) *requestPeerManager {
+	return &requestPeerManager{
+		peerId:   peerId,
+		handlers: map[string]*testSyncHandler{},
+		log:      log,
+	}
+}
+
+func (r *requestPeerManager) addHandler(peerId string, handler *testSyncHandler) {
+	r.handlers[peerId] = handler
+}
+
+func (r *requestPeerManager) Run(ctx context.Context) (err error) {
+	return nil
+}
+
+func (r *requestPeerManager) Close(ctx context.Context) (err error) {
+	return nil
+}
+
+func (r *requestPeerManager) SendRequest(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
+	panic("should not be called")
+}
+
+func (r *requestPeerManager) QueueRequest(peerId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
+	pMsg := protocolMsg{
+		msg:        msg,
+		senderId:   r.peerId,
+		receiverId: peerId,
+	}
+	r.log.addMessage(pMsg)
+	return r.handlers[peerId].send(context.Background(), pMsg)
+}
+
+func (r *requestPeerManager) Init(a *app.App) (err error) {
+	return
+}
+
+func (r *requestPeerManager) Name() (name string) {
+	return
+}
+
+func (r *requestPeerManager) SendPeer(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
+	pMsg := protocolMsg{
+		msg:        msg,
+		senderId:   r.peerId,
+		receiverId: peerId,
+	}
+	r.log.addMessage(pMsg)
+	return r.handlers[peerId].send(context.Background(), pMsg)
+}
+
+func (r *requestPeerManager) Broadcast(ctx context.Context, msg *spacesyncproto.ObjectSyncMessage) (err error) {
+	for _, handler := range r.handlers {
+		pMsg := protocolMsg{
+			msg:        msg,
+			senderId:   r.peerId,
+			receiverId: handler.peerId,
+		}
+		r.log.addMessage(pMsg)
+		handler.send(context.Background(), pMsg)
+	}
+	return
+}
+
+func (r *requestPeerManager) GetResponsiblePeers(ctx context.Context) (peers []peer.Peer, err error) {
+	return nil, nil
+}
+
+func (r *requestPeerManager) GetNodePeers(ctx context.Context) (peers []peer.Peer, err error) {
+	return nil, nil
+}
+
 // testSyncHandler is the wrapper around individual tree to test sync protocol
 type testSyncHandler struct {
 	synchandler.SyncHandler
-	batcher    *mb.MB[protocolMsg]
-	peerId     string
-	aclList    list.AclList
-	log        *messageLog
-	syncClient objectsync.SyncClient
-	builder    objecttree.BuildObjectTreeFunc
+	batcher     *mb.MB[protocolMsg]
+	peerId      string
+	aclList     list.AclList
+	log         *messageLog
+	syncClient  SyncClient
+	builder     objecttree.BuildObjectTreeFunc
+	peerManager *requestPeerManager
 }
 
 // createSyncHandler creates a sync handler when a tree is already created
 func createSyncHandler(peerId, spaceId string, objTree objecttree.ObjectTree, log *messageLog) *testSyncHandler {
-	factory := objectsync.NewRequestFactory()
-	syncClient := objectsync.NewSyncClient(spaceId, newTestMessagePool(peerId, log), factory)
+	peerManager := newRequestPeerManager(peerId, log)
+	syncClient := NewSyncClient(spaceId, peerManager, peerManager)
 	netTree := &broadcastTree{
 		ObjectTree: objTree,
 		SyncClient: syncClient,
 	}
 	handler := newSyncTreeHandler(spaceId, netTree, syncClient, syncstatus.NewNoOpSyncStatus())
-	return newTestSyncHandler(peerId, handler)
+	return &testSyncHandler{
+		SyncHandler: handler,
+		batcher:     mb.New[protocolMsg](0),
+		peerId:      peerId,
+		peerManager: peerManager,
+	}
 }
 
 // createEmptySyncHandler creates a sync handler when the tree will be provided later (this emulates the situation when we have no tree)
 func createEmptySyncHandler(peerId, spaceId string, builder objecttree.BuildObjectTreeFunc, aclList list.AclList, log *messageLog) *testSyncHandler {
-	factory := objectsync.NewRequestFactory()
-	syncClient := objectsync.NewSyncClient(spaceId, newTestMessagePool(peerId, log), factory)
+	peerManager := newRequestPeerManager(peerId, log)
+	syncClient := NewSyncClient(spaceId, peerManager, peerManager)
 
 	batcher := mb.New[protocolMsg](0)
 	return &testSyncHandler{
-		batcher:    batcher,
-		peerId:     peerId,
-		aclList:    aclList,
-		log:        log,
-		syncClient: syncClient,
-		builder:    builder,
-	}
-}
-
-func newTestSyncHandler(peerId string, syncHandler synchandler.SyncHandler) *testSyncHandler {
-	batcher := mb.New[protocolMsg](0)
-	return &testSyncHandler{
-		SyncHandler: syncHandler,
 		batcher:     batcher,
 		peerId:      peerId,
+		aclList:     aclList,
+		log:         log,
+		syncClient:  syncClient,
+		builder:     builder,
+		peerManager: peerManager,
 	}
 }
 
@@ -140,13 +217,8 @@ func (h *testSyncHandler) HandleMessage(ctx context.Context, senderId string, re
 		return
 	}
 	if unmarshalled.Content.GetFullSyncResponse() == nil {
-		newTreeRequest := objectsync.NewRequestFactory().CreateNewTreeRequest()
-		var objMsg *spacesyncproto.ObjectSyncMessage
-		objMsg, err = objectsync.MarshallTreeMessage(newTreeRequest, request.SpaceId, request.ObjectId, "")
-		if err != nil {
-			return
-		}
-		return h.manager().SendPeer(context.Background(), senderId, objMsg)
+		newTreeRequest := NewRequestFactory().CreateNewTreeRequest()
+		return h.syncClient.QueueRequest(senderId, request.ObjectId, newTreeRequest)
 	}
 	fullSyncResponse := unmarshalled.Content.GetFullSyncResponse()
 	treeStorage, _ := treestorage.NewInMemoryTreeStorage(unmarshalled.RootChange, []string{unmarshalled.RootChange.Id}, nil)
@@ -166,20 +238,13 @@ func (h *testSyncHandler) HandleMessage(ctx context.Context, senderId string, re
 		return
 	}
 	h.SyncHandler = newSyncTreeHandler(request.SpaceId, netTree, h.syncClient, syncstatus.NewNoOpSyncStatus())
-	var objMsg *spacesyncproto.ObjectSyncMessage
-	newTreeRequest := objectsync.NewRequestFactory().CreateHeadUpdate(netTree, res.Added)
-	objMsg, err = objectsync.MarshallTreeMessage(newTreeRequest, request.SpaceId, request.ObjectId, "")
-	if err != nil {
-		return
-	}
-	return h.manager().Broadcast(context.Background(), objMsg)
+	headUpdate := NewRequestFactory().CreateHeadUpdate(netTree, res.Added)
+	h.syncClient.Broadcast(headUpdate)
+	return nil
 }
 
-func (h *testSyncHandler) manager() *testMessagePool {
-	if h.SyncHandler != nil {
-		return h.SyncHandler.(*syncTreeHandler).syncClient.MessagePool().(*testMessagePool)
-	}
-	return h.syncClient.MessagePool().(*testMessagePool)
+func (h *testSyncHandler) manager() *requestPeerManager {
+	return h.peerManager
 }
 
 func (h *testSyncHandler) tree() *broadcastTree {
@@ -211,74 +276,28 @@ func (h *testSyncHandler) run(ctx context.Context, t *testing.T, wg *sync.WaitGr
 				h.tree().Unlock()
 				continue
 			}
-			err = h.HandleMessage(ctx, res.senderId, res.msg)
-			if err != nil {
-				fmt.Println("error handling message", err.Error())
-				continue
+			if res.description().name == "FullSyncRequest" {
+				resp, err := h.HandleRequest(ctx, res.senderId, res.msg)
+				if err != nil {
+					fmt.Println("error handling request", err.Error())
+					continue
+				}
+				h.peerManager.SendPeer(ctx, res.senderId, resp)
+			} else {
+				err = h.HandleMessage(ctx, res.senderId, res.msg)
+				if err != nil {
+					fmt.Println("error handling message", err.Error())
+				}
 			}
 		}
 	}()
 }
 
-// testMessagePool captures all other handlers and sends messages to them
-type testMessagePool struct {
-	peerId   string
-	handlers map[string]*testSyncHandler
-	log      *messageLog
-}
-
-func newTestMessagePool(peerId string, log *messageLog) *testMessagePool {
-	return &testMessagePool{handlers: map[string]*testSyncHandler{}, peerId: peerId, log: log}
-}
-
-func (m *testMessagePool) addHandler(peerId string, handler *testSyncHandler) {
-	m.handlers[peerId] = handler
-}
-
-func (m *testMessagePool) SendPeer(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
-	pMsg := protocolMsg{
-		msg:        msg,
-		senderId:   m.peerId,
-		receiverId: peerId,
-	}
-	m.log.addMessage(pMsg)
-	return m.handlers[peerId].send(context.Background(), pMsg)
-}
-
-func (m *testMessagePool) Broadcast(ctx context.Context, msg *spacesyncproto.ObjectSyncMessage) (err error) {
-	for _, handler := range m.handlers {
-		pMsg := protocolMsg{
-			msg:        msg,
-			senderId:   m.peerId,
-			receiverId: handler.peerId,
-		}
-		m.log.addMessage(pMsg)
-		handler.send(context.Background(), pMsg)
-	}
-	return
-}
-
-func (m *testMessagePool) GetResponsiblePeers(ctx context.Context) (peers []peer.Peer, err error) {
-	panic("should not be called")
-}
-
-func (m *testMessagePool) LastUsage() time.Time {
-	panic("should not be called")
-}
-
-func (m *testMessagePool) HandleMessage(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (err error) {
-	panic("should not be called")
-}
-
-func (m *testMessagePool) SendSync(ctx context.Context, peerId string, message *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
-	panic("should not be called")
-}
-
 // broadcastTree is the tree that broadcasts changes to everyone when changes are added
 // it is a simplified version of SyncTree which is easier to use in the test environment
 type broadcastTree struct {
 	objecttree.ObjectTree
-	objectsync.SyncClient
+	SyncClient
 }
 
 func (b *broadcastTree) AddRawChanges(ctx context.Context, changes objecttree.RawChangesPayload) (objecttree.AddResult, error) {
@@ -287,7 +306,7 @@ func (b *broadcastTree) AddRawChanges(ctx context.Context, changes objecttree.Ra
 		return objecttree.AddResult{}, err
 	}
 	upd := b.SyncClient.CreateHeadUpdate(b.ObjectTree, res.Added)
-	b.SyncClient.Broadcast(ctx, upd)
+	b.SyncClient.Broadcast(upd)
 	return res, nil
 }
 

commonspace/object/tree/treestorage/mock_treestorage/mock_treestorage.go

@@ -9,7 +9,7 @@ import (
 	reflect "reflect"
 
 	treechangeproto "github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockTreeStorage is a mock of TreeStorage interface.

commonspace/object/treemanager/mock_treemanager/mock_treemanager.go

@@ -11,7 +11,7 @@ import (
 	app "github.com/anyproto/any-sync/app"
 	objecttree "github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	treemanager "github.com/anyproto/any-sync/commonspace/object/treemanager"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockTreeManager is a mock of TreeManager interface.

commonspace/objectmanager/objectmanager.go

@@ -0,0 +1,98 @@
+package objectmanager
+
+import (
+	"context"
+	"errors"
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
+	"github.com/anyproto/any-sync/commonspace/object/syncobjectgetter"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/treemanager"
+	"github.com/anyproto/any-sync/commonspace/settings"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
+	"sync/atomic"
+)
+
+var (
+	ErrSpaceClosed = errors.New("space is closed")
+)
+
+type ObjectManager interface {
+	treemanager.TreeManager
+	AddObject(object syncobjectgetter.SyncObject)
+	GetObject(ctx context.Context, objectId string) (obj syncobjectgetter.SyncObject, err error)
+}
+
+type objectManager struct {
+	treemanager.TreeManager
+	spaceId         string
+	reservedObjects []syncobjectgetter.SyncObject
+	spaceIsClosed   *atomic.Bool
+}
+
+func New(manager treemanager.TreeManager) ObjectManager {
+	return &objectManager{
+		TreeManager: manager,
+	}
+}
+
+func (o *objectManager) Init(a *app.App) (err error) {
+	state := a.MustComponent(spacestate.CName).(*spacestate.SpaceState)
+	o.spaceId = state.SpaceId
+	o.spaceIsClosed = state.SpaceIsClosed
+	settingsObject := a.MustComponent(settings.CName).(settings.Settings).SettingsObject()
+	acl := a.MustComponent(syncacl.CName).(syncacl.SyncAcl)
+	o.AddObject(settingsObject)
+	o.AddObject(acl)
+	return nil
+}
+
+func (o *objectManager) Run(ctx context.Context) (err error) {
+	return nil
+}
+
+func (o *objectManager) Close(ctx context.Context) (err error) {
+	return nil
+}
+
+func (o *objectManager) AddObject(object syncobjectgetter.SyncObject) {
+	o.reservedObjects = append(o.reservedObjects, object)
+}
+
+func (o *objectManager) Name() string {
+	return treemanager.CName
+}
+
+func (o *objectManager) GetTree(ctx context.Context, spaceId, treeId string) (objecttree.ObjectTree, error) {
+	if o.spaceIsClosed.Load() {
+		return nil, ErrSpaceClosed
+	}
+	if obj := o.getReservedObject(treeId); obj != nil {
+		return obj.(objecttree.ObjectTree), nil
+	}
+	return o.TreeManager.GetTree(ctx, spaceId, treeId)
+}
+
+func (o *objectManager) getReservedObject(id string) syncobjectgetter.SyncObject {
+	for _, obj := range o.reservedObjects {
+		if obj != nil && obj.Id() == id {
+			return obj
+		}
+	}
+	return nil
+}
+
+func (o *objectManager) GetObject(ctx context.Context, objectId string) (obj syncobjectgetter.SyncObject, err error) {
+	if o.spaceIsClosed.Load() {
+		return nil, ErrSpaceClosed
+	}
+	if obj := o.getReservedObject(objectId); obj != nil {
+		return obj, nil
+	}
+	t, err := o.TreeManager.GetTree(ctx, o.spaceId, objectId)
+	if err != nil {
+		return
+	}
+	obj = t.(syncobjectgetter.SyncObject)
+	return
+}

commonspace/objectsync/mock_objectsync/mock_objectsync.go

@@ -1,5 +1,5 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/anyproto/any-sync/commonspace/objectsync (interfaces: SyncClient)
+// Source: github.com/anyproto/any-sync/commonspace/objectsync (interfaces: ObjectSync)
 
 // Package mock_objectsync is a generated GoMock package.
 package mock_objectsync
@@ -7,146 +7,146 @@ package mock_objectsync
 import (
 	context "context"
 	reflect "reflect"
+	time "time"
 
-	objecttree "github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
-	treechangeproto "github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	app "github.com/anyproto/any-sync/app"
 	objectsync "github.com/anyproto/any-sync/commonspace/objectsync"
 	spacesyncproto "github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
-// MockSyncClient is a mock of SyncClient interface.
-type MockSyncClient struct {
+// MockObjectSync is a mock of ObjectSync interface.
+type MockObjectSync struct {
 	ctrl     *gomock.Controller
-	recorder *MockSyncClientMockRecorder
+	recorder *MockObjectSyncMockRecorder
 }
 
-// MockSyncClientMockRecorder is the mock recorder for MockSyncClient.
-type MockSyncClientMockRecorder struct {
-	mock *MockSyncClient
+// MockObjectSyncMockRecorder is the mock recorder for MockObjectSync.
+type MockObjectSyncMockRecorder struct {
+	mock *MockObjectSync
 }
 
-// NewMockSyncClient creates a new mock instance.
-func NewMockSyncClient(ctrl *gomock.Controller) *MockSyncClient {
-	mock := &MockSyncClient{ctrl: ctrl}
-	mock.recorder = &MockSyncClientMockRecorder{mock}
+// NewMockObjectSync creates a new mock instance.
+func NewMockObjectSync(ctrl *gomock.Controller) *MockObjectSync {
+	mock := &MockObjectSync{ctrl: ctrl}
+	mock.recorder = &MockObjectSyncMockRecorder{mock}
 	return mock
 }
 
 // EXPECT returns an object that allows the caller to indicate expected use.
-func (m *MockSyncClient) EXPECT() *MockSyncClientMockRecorder {
+func (m *MockObjectSync) EXPECT() *MockObjectSyncMockRecorder {
 	return m.recorder
 }
 
-// Broadcast mocks base method.
-func (m *MockSyncClient) Broadcast(arg0 context.Context, arg1 *treechangeproto.TreeSyncMessage) {
+// Close mocks base method.
+func (m *MockObjectSync) Close(arg0 context.Context) error {
 	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Broadcast", arg0, arg1)
-}
-
-// Broadcast indicates an expected call of Broadcast.
-func (mr *MockSyncClientMockRecorder) Broadcast(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Broadcast", reflect.TypeOf((*MockSyncClient)(nil).Broadcast), arg0, arg1)
-}
-
-// CreateFullSyncRequest mocks base method.
-func (m *MockSyncClient) CreateFullSyncRequest(arg0 objecttree.ObjectTree, arg1, arg2 []string) (*treechangeproto.TreeSyncMessage, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "CreateFullSyncRequest", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// CreateFullSyncRequest indicates an expected call of CreateFullSyncRequest.
-func (mr *MockSyncClientMockRecorder) CreateFullSyncRequest(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncRequest", reflect.TypeOf((*MockSyncClient)(nil).CreateFullSyncRequest), arg0, arg1, arg2)
-}
-
-// CreateFullSyncResponse mocks base method.
-func (m *MockSyncClient) CreateFullSyncResponse(arg0 objecttree.ObjectTree, arg1, arg2 []string) (*treechangeproto.TreeSyncMessage, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "CreateFullSyncResponse", arg0, arg1, arg2)
-	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// CreateFullSyncResponse indicates an expected call of CreateFullSyncResponse.
-func (mr *MockSyncClientMockRecorder) CreateFullSyncResponse(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateFullSyncResponse", reflect.TypeOf((*MockSyncClient)(nil).CreateFullSyncResponse), arg0, arg1, arg2)
-}
-
-// CreateHeadUpdate mocks base method.
-func (m *MockSyncClient) CreateHeadUpdate(arg0 objecttree.ObjectTree, arg1 []*treechangeproto.RawTreeChangeWithId) *treechangeproto.TreeSyncMessage {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "CreateHeadUpdate", arg0, arg1)
-	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret := m.ctrl.Call(m, "Close", arg0)
+	ret0, _ := ret[0].(error)
 	return ret0
 }
 
-// CreateHeadUpdate indicates an expected call of CreateHeadUpdate.
-func (mr *MockSyncClientMockRecorder) CreateHeadUpdate(arg0, arg1 interface{}) *gomock.Call {
+// Close indicates an expected call of Close.
+func (mr *MockObjectSyncMockRecorder) Close(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateHeadUpdate", reflect.TypeOf((*MockSyncClient)(nil).CreateHeadUpdate), arg0, arg1)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockObjectSync)(nil).Close), arg0)
 }
 
-// CreateNewTreeRequest mocks base method.
-func (m *MockSyncClient) CreateNewTreeRequest() *treechangeproto.TreeSyncMessage {
+// CloseThread mocks base method.
+func (m *MockObjectSync) CloseThread(arg0 string) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "CreateNewTreeRequest")
-	ret0, _ := ret[0].(*treechangeproto.TreeSyncMessage)
+	ret := m.ctrl.Call(m, "CloseThread", arg0)
+	ret0, _ := ret[0].(error)
 	return ret0
 }
 
-// CreateNewTreeRequest indicates an expected call of CreateNewTreeRequest.
-func (mr *MockSyncClientMockRecorder) CreateNewTreeRequest() *gomock.Call {
+// CloseThread indicates an expected call of CloseThread.
+func (mr *MockObjectSyncMockRecorder) CloseThread(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateNewTreeRequest", reflect.TypeOf((*MockSyncClient)(nil).CreateNewTreeRequest))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CloseThread", reflect.TypeOf((*MockObjectSync)(nil).CloseThread), arg0)
 }
 
-// MessagePool mocks base method.
-func (m *MockSyncClient) MessagePool() objectsync.MessagePool {
+// HandleMessage mocks base method.
+func (m *MockObjectSync) HandleMessage(arg0 context.Context, arg1 objectsync.HandleMessage) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "MessagePool")
-	ret0, _ := ret[0].(objectsync.MessagePool)
+	ret := m.ctrl.Call(m, "HandleMessage", arg0, arg1)
+	ret0, _ := ret[0].(error)
 	return ret0
 }
 
-// MessagePool indicates an expected call of MessagePool.
-func (mr *MockSyncClientMockRecorder) MessagePool() *gomock.Call {
+// HandleMessage indicates an expected call of HandleMessage.
+func (mr *MockObjectSyncMockRecorder) HandleMessage(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "MessagePool", reflect.TypeOf((*MockSyncClient)(nil).MessagePool))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HandleMessage", reflect.TypeOf((*MockObjectSync)(nil).HandleMessage), arg0, arg1)
 }
 
-// SendSync mocks base method.
-func (m *MockSyncClient) SendSync(arg0 context.Context, arg1, arg2 string, arg3 *treechangeproto.TreeSyncMessage) (*spacesyncproto.ObjectSyncMessage, error) {
+// HandleRequest mocks base method.
+func (m *MockObjectSync) HandleRequest(arg0 context.Context, arg1 *spacesyncproto.ObjectSyncMessage) (*spacesyncproto.ObjectSyncMessage, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "SendSync", arg0, arg1, arg2, arg3)
+	ret := m.ctrl.Call(m, "HandleRequest", arg0, arg1)
 	ret0, _ := ret[0].(*spacesyncproto.ObjectSyncMessage)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// SendSync indicates an expected call of SendSync.
-func (mr *MockSyncClientMockRecorder) SendSync(arg0, arg1, arg2, arg3 interface{}) *gomock.Call {
+// HandleRequest indicates an expected call of HandleRequest.
+func (mr *MockObjectSyncMockRecorder) HandleRequest(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SendSync", reflect.TypeOf((*MockSyncClient)(nil).SendSync), arg0, arg1, arg2, arg3)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HandleRequest", reflect.TypeOf((*MockObjectSync)(nil).HandleRequest), arg0, arg1)
 }
 
-// SendWithReply mocks base method.
-func (m *MockSyncClient) SendWithReply(arg0 context.Context, arg1, arg2 string, arg3 *treechangeproto.TreeSyncMessage, arg4 string) error {
+// Init mocks base method.
+func (m *MockObjectSync) Init(arg0 *app.App) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "SendWithReply", arg0, arg1, arg2, arg3, arg4)
+	ret := m.ctrl.Call(m, "Init", arg0)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
-// SendWithReply indicates an expected call of SendWithReply.
-func (mr *MockSyncClientMockRecorder) SendWithReply(arg0, arg1, arg2, arg3, arg4 interface{}) *gomock.Call {
+// Init indicates an expected call of Init.
+func (mr *MockObjectSyncMockRecorder) Init(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SendWithReply", reflect.TypeOf((*MockSyncClient)(nil).SendWithReply), arg0, arg1, arg2, arg3, arg4)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockObjectSync)(nil).Init), arg0)
+}
+
+// LastUsage mocks base method.
+func (m *MockObjectSync) LastUsage() time.Time {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "LastUsage")
+	ret0, _ := ret[0].(time.Time)
+	return ret0
+}
+
+// LastUsage indicates an expected call of LastUsage.
+func (mr *MockObjectSyncMockRecorder) LastUsage() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LastUsage", reflect.TypeOf((*MockObjectSync)(nil).LastUsage))
+}
+
+// Name mocks base method.
+func (m *MockObjectSync) Name() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Name")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Name indicates an expected call of Name.
+func (mr *MockObjectSyncMockRecorder) Name() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Name", reflect.TypeOf((*MockObjectSync)(nil).Name))
+}
+
+// Run mocks base method.
+func (m *MockObjectSync) Run(arg0 context.Context) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Run", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Run indicates an expected call of Run.
+func (mr *MockObjectSyncMockRecorder) Run(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Run", reflect.TypeOf((*MockObjectSync)(nil).Run), arg0)
 }

commonspace/objectsync/msgpool.go

@@ -1,142 +0,0 @@
-package objectsync
-
-import (
-	"context"
-	"fmt"
-	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
-	"github.com/anyproto/any-sync/commonspace/peermanager"
-	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	"go.uber.org/zap"
-	"strconv"
-	"strings"
-	"sync"
-	"sync/atomic"
-	"time"
-)
-
-type LastUsage interface {
-	LastUsage() time.Time
-}
-
-// MessagePool can be made generic to work with different streams
-type MessagePool interface {
-	LastUsage
-	synchandler.SyncHandler
-	peermanager.PeerManager
-	SendSync(ctx context.Context, peerId string, message *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error)
-}
-
-type MessageHandler func(ctx context.Context, senderId string, message *spacesyncproto.ObjectSyncMessage) (err error)
-
-type responseWaiter struct {
-	ch chan *spacesyncproto.ObjectSyncMessage
-}
-
-type messagePool struct {
-	sync.Mutex
-	peermanager.PeerManager
-	messageHandler MessageHandler
-	waiters        map[string]responseWaiter
-	waitersMx      sync.Mutex
-	counter        atomic.Uint64
-	lastUsage      atomic.Int64
-}
-
-func newMessagePool(peerManager peermanager.PeerManager, messageHandler MessageHandler) MessagePool {
-	s := &messagePool{
-		PeerManager:    peerManager,
-		messageHandler: messageHandler,
-		waiters:        make(map[string]responseWaiter),
-	}
-	return s
-}
-
-func (s *messagePool) SendSync(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
-	s.updateLastUsage()
-	if _, ok := ctx.Deadline(); !ok {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithTimeout(ctx, time.Minute)
-		defer cancel()
-	}
-	newCounter := s.counter.Add(1)
-	msg.RequestId = genReplyKey(peerId, msg.ObjectId, newCounter)
-	log.InfoCtx(ctx, "mpool sendSync", zap.String("requestId", msg.RequestId))
-	s.waitersMx.Lock()
-	waiter := responseWaiter{
-		ch: make(chan *spacesyncproto.ObjectSyncMessage, 1),
-	}
-	s.waiters[msg.RequestId] = waiter
-	s.waitersMx.Unlock()
-
-	err = s.SendPeer(ctx, peerId, msg)
-	if err != nil {
-		return
-	}
-	select {
-	case <-ctx.Done():
-		s.waitersMx.Lock()
-		delete(s.waiters, msg.RequestId)
-		s.waitersMx.Unlock()
-
-		log.With(zap.String("requestId", msg.RequestId)).DebugCtx(ctx, "time elapsed when waiting")
-		err = fmt.Errorf("sendSync context error: %v", ctx.Err())
-	case reply = <-waiter.ch:
-		// success
-	}
-	return
-}
-
-func (s *messagePool) SendPeer(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
-	s.updateLastUsage()
-	return s.PeerManager.SendPeer(ctx, peerId, msg)
-}
-
-func (s *messagePool) Broadcast(ctx context.Context, msg *spacesyncproto.ObjectSyncMessage) (err error) {
-	s.updateLastUsage()
-	return s.PeerManager.Broadcast(ctx, msg)
-}
-
-func (s *messagePool) HandleMessage(ctx context.Context, senderId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
-	s.updateLastUsage()
-	if msg.ReplyId != "" {
-		log.InfoCtx(ctx, "mpool receive reply", zap.String("replyId", msg.ReplyId))
-		// we got reply, send it to waiter
-		if s.stopWaiter(msg) {
-			return
-		}
-		log.WarnCtx(ctx, "reply id does not exist", zap.String("replyId", msg.ReplyId))
-		return
-	}
-	return s.messageHandler(ctx, senderId, msg)
-}
-
-func (s *messagePool) LastUsage() time.Time {
-	return time.Unix(s.lastUsage.Load(), 0)
-}
-
-func (s *messagePool) updateLastUsage() {
-	s.lastUsage.Store(time.Now().Unix())
-}
-
-func (s *messagePool) stopWaiter(msg *spacesyncproto.ObjectSyncMessage) bool {
-	s.waitersMx.Lock()
-	waiter, exists := s.waiters[msg.ReplyId]
-	if exists {
-		delete(s.waiters, msg.ReplyId)
-		s.waitersMx.Unlock()
-		waiter.ch <- msg
-		return true
-	}
-	s.waitersMx.Unlock()
-	return false
-}
-
-func genReplyKey(peerId, treeId string, counter uint64) string {
-	b := &strings.Builder{}
-	b.WriteString(peerId)
-	b.WriteString(".")
-	b.WriteString(treeId)
-	b.WriteString(".")
-	b.WriteString(strconv.FormatUint(counter, 36))
-	return b.String()
-}

commonspace/objectsync/objectsync.go

@@ -1,18 +1,24 @@
-//go:generate mockgen -destination mock_objectsync/mock_objectsync.go github.com/anyproto/any-sync/commonspace/objectsync SyncClient
+//go:generate mockgen -destination mock_objectsync/mock_objectsync.go github.com/anyproto/any-sync/commonspace/objectsync ObjectSync
 package objectsync
 
 import (
 	"context"
 	"fmt"
-	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
-	"github.com/gogo/protobuf/proto"
 	"sync/atomic"
 	"time"
 
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/object/treemanager"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
+	"github.com/anyproto/any-sync/metric"
+	"github.com/anyproto/any-sync/net/peer"
+	"github.com/anyproto/any-sync/util/multiqueue"
+	"github.com/cheggaaa/mb/v3"
+	"github.com/gogo/protobuf/proto"
+
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/object/syncobjectgetter"
-	"github.com/anyproto/any-sync/commonspace/objectsync/synchandler"
-	"github.com/anyproto/any-sync/commonspace/peermanager"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/nodeconf"
@@ -20,138 +26,208 @@ import (
 	"golang.org/x/exp/slices"
 )
 
-var log = logger.NewNamed("common.commonspace.objectsync")
+const CName = "common.commonspace.objectsync"
+
+var log = logger.NewNamed(CName)
 
 type ObjectSync interface {
-	LastUsage
-	synchandler.SyncHandler
-	SyncClient() SyncClient
+	LastUsage() time.Time
+	HandleMessage(ctx context.Context, hm HandleMessage) (err error)
+	HandleRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error)
+	CloseThread(id string) (err error)
+	app.ComponentRunnable
+}
 
-	Close() (err error)
+type HandleMessage struct {
+	Id                uint64
+	ReceiveTime       time.Time
+	StartHandlingTime time.Time
+	Deadline          time.Time
+	SenderId          string
+	Message           *spacesyncproto.ObjectSyncMessage
+	PeerCtx           context.Context
+}
+
+func (m HandleMessage) LogFields(fields ...zap.Field) []zap.Field {
+	return append(fields,
+		metric.SpaceId(m.Message.SpaceId),
+		metric.ObjectId(m.Message.ObjectId),
+		metric.QueueDur(m.StartHandlingTime.Sub(m.ReceiveTime)),
+		metric.TotalDur(time.Since(m.ReceiveTime)),
+	)
 }
 
 type objectSync struct {
 	spaceId string
 
-	messagePool   MessagePool
-	syncClient    SyncClient
 	objectGetter  syncobjectgetter.SyncObjectGetter
 	configuration nodeconf.NodeConf
 	spaceStorage  spacestorage.SpaceStorage
+	metric        metric.Metric
 
-	syncCtx        context.Context
-	cancelSync     context.CancelFunc
 	spaceIsDeleted *atomic.Bool
+	handleQueue    multiqueue.MultiQueue[HandleMessage]
 }
 
-func NewObjectSync(
-	spaceId string,
-	spaceIsDeleted *atomic.Bool,
-	configuration nodeconf.NodeConf,
-	peerManager peermanager.PeerManager,
-	objectGetter syncobjectgetter.SyncObjectGetter,
-	storage spacestorage.SpaceStorage) ObjectSync {
-	syncCtx, cancel := context.WithCancel(context.Background())
-	os := &objectSync{
-		objectGetter:   objectGetter,
-		spaceStorage:   storage,
-		spaceId:        spaceId,
-		syncCtx:        syncCtx,
-		cancelSync:     cancel,
-		spaceIsDeleted: spaceIsDeleted,
-		configuration:  configuration,
+func (s *objectSync) Init(a *app.App) (err error) {
+	s.spaceStorage = a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	s.objectGetter = a.MustComponent(treemanager.CName).(syncobjectgetter.SyncObjectGetter)
+	s.configuration = a.MustComponent(nodeconf.CName).(nodeconf.NodeConf)
+	sharedData := a.MustComponent(spacestate.CName).(*spacestate.SpaceState)
+	mc := a.Component(metric.CName)
+	if mc != nil {
+		s.metric = mc.(metric.Metric)
 	}
-	os.messagePool = newMessagePool(peerManager, os.handleMessage)
-	os.syncClient = NewSyncClient(spaceId, os.messagePool, NewRequestFactory())
-	return os
+	s.spaceIsDeleted = sharedData.SpaceIsDeleted
+	s.spaceId = sharedData.SpaceId
+	s.handleQueue = multiqueue.New[HandleMessage](s.processHandleMessage, 30)
+	return nil
 }
 
-func (s *objectSync) Close() (err error) {
-	s.cancelSync()
-	return
+func (s *objectSync) Name() (name string) {
+	return CName
+}
+
+func (s *objectSync) Run(ctx context.Context) (err error) {
+	return nil
+}
+
+func (s *objectSync) Close(ctx context.Context) (err error) {
+	return s.handleQueue.Close()
+}
+
+func New() ObjectSync {
+	return &objectSync{}
 }
 
 func (s *objectSync) LastUsage() time.Time {
-	return s.messagePool.LastUsage()
+	// TODO: add time
+	return time.Time{}
 }
 
-func (s *objectSync) HandleMessage(ctx context.Context, senderId string, message *spacesyncproto.ObjectSyncMessage) (err error) {
-	return s.messagePool.HandleMessage(ctx, senderId, message)
+func (s *objectSync) HandleRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
+	peerId, err := peer.CtxPeerId(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return s.handleRequest(ctx, peerId, req)
 }
 
-func (s *objectSync) handleMessage(ctx context.Context, senderId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
-	log := log.With(
-		zap.String("objectId", msg.ObjectId),
-		zap.String("requestId", msg.RequestId),
-		zap.String("replyId", msg.ReplyId))
+func (s *objectSync) HandleMessage(ctx context.Context, hm HandleMessage) (err error) {
+	threadId := hm.Message.ObjectId
+	hm.ReceiveTime = time.Now()
+	if hm.PeerCtx == nil {
+		hm.PeerCtx = ctx
+	}
+	err = s.handleQueue.Add(ctx, threadId, hm)
+	if err == mb.ErrOverflowed {
+		log.InfoCtx(ctx, "queue overflowed", zap.String("spaceId", s.spaceId), zap.String("objectId", threadId))
+		// skip overflowed error
+		return nil
+	}
+	return
+}
+
+func (s *objectSync) processHandleMessage(msg HandleMessage) {
+	var err error
+	msg.StartHandlingTime = time.Now()
+	ctx := peer.CtxWithPeerId(context.Background(), msg.SenderId)
+	ctx = logger.CtxWithFields(ctx, zap.Uint64("msgId", msg.Id), zap.String("senderId", msg.SenderId))
+	defer func() {
+		if s.metric == nil {
+			return
+		}
+		s.metric.RequestLog(msg.PeerCtx, "space.streamOp", msg.LogFields(
+			zap.Error(err),
+		)...)
+	}()
+
+	if !msg.Deadline.IsZero() {
+		now := time.Now()
+		if now.After(msg.Deadline) {
+			log.InfoCtx(ctx, "skip message: deadline exceed")
+			err = context.DeadlineExceeded
+			return
+		}
+	}
+	if err = s.handleMessage(ctx, msg.SenderId, msg.Message); err != nil {
+		if msg.Message.ObjectId != "" {
+			// cleanup thread on error
+			_ = s.handleQueue.CloseThread(msg.Message.ObjectId)
+		}
+		log.InfoCtx(ctx, "handleMessage error", zap.Error(err))
+	}
+}
+
+func (s *objectSync) handleRequest(ctx context.Context, senderId string, msg *spacesyncproto.ObjectSyncMessage) (response *spacesyncproto.ObjectSyncMessage, err error) {
+	log := log.With(zap.String("objectId", msg.ObjectId))
 	if s.spaceIsDeleted.Load() {
 		log = log.With(zap.Bool("isDeleted", true))
 		// preventing sync with other clients if they are not just syncing the settings tree
 		if !slices.Contains(s.configuration.NodeIds(s.spaceId), senderId) && msg.ObjectId != s.spaceStorage.SpaceSettingsId() {
-			s.unmarshallSendError(ctx, msg, spacesyncproto.ErrUnexpected, senderId, msg.ObjectId)
-			return fmt.Errorf("can't perform operation with object, space is deleted")
+			return nil, spacesyncproto.ErrSpaceIsDeleted
 		}
 	}
-	log.DebugCtx(ctx, "handling message")
+	err = s.checkEmptyFullSync(log, msg)
+	if err != nil {
+		return nil, err
+	}
+	obj, err := s.objectGetter.GetObject(ctx, msg.ObjectId)
+	if err != nil {
+		return nil, treechangeproto.ErrGetTree
+	}
+	return obj.HandleRequest(ctx, senderId, msg)
+}
+
+func (s *objectSync) handleMessage(ctx context.Context, senderId string, msg *spacesyncproto.ObjectSyncMessage) (err error) {
+	log := log.With(zap.String("objectId", msg.ObjectId))
+	if s.spaceIsDeleted.Load() {
+		log = log.With(zap.Bool("isDeleted", true))
+		// preventing sync with other clients if they are not just syncing the settings tree
+		if !slices.Contains(s.configuration.NodeIds(s.spaceId), senderId) && msg.ObjectId != s.spaceStorage.SpaceSettingsId() {
+			return spacesyncproto.ErrSpaceIsDeleted
+		}
+	}
+	err = s.checkEmptyFullSync(log, msg)
+	if err != nil {
+		return err
+	}
+	obj, err := s.objectGetter.GetObject(ctx, msg.ObjectId)
+	if err != nil {
+		return fmt.Errorf("failed to get object from cache: %w", err)
+	}
+	err = obj.HandleMessage(ctx, senderId, msg)
+	if err != nil {
+		return fmt.Errorf("failed to handle message: %w", err)
+	}
+	return
+}
+
+func (s *objectSync) CloseThread(id string) (err error) {
+	return s.handleQueue.CloseThread(id)
+}
+
+func (s *objectSync) checkEmptyFullSync(log logger.CtxLogger, msg *spacesyncproto.ObjectSyncMessage) (err error) {
 	hasTree, err := s.spaceStorage.HasTree(msg.ObjectId)
 	if err != nil {
-		s.unmarshallSendError(ctx, msg, spacesyncproto.ErrUnexpected, senderId, msg.ObjectId)
-		return fmt.Errorf("falied to execute get operation on storage has tree: %w", err)
+		log.Warn("failed to execute get operation on storage has tree", zap.Error(err))
+		return spacesyncproto.ErrUnexpected
 	}
 	// in this case we will try to get it from remote, unless the sender also sent us the same request :-)
 	if !hasTree {
 		treeMsg := &treechangeproto.TreeSyncMessage{}
 		err = proto.Unmarshal(msg.Payload, treeMsg)
 		if err != nil {
-			s.sendError(ctx, nil, spacesyncproto.ErrUnexpected, senderId, msg.ObjectId, msg.RequestId)
-			return fmt.Errorf("failed to unmarshall tree sync message: %w", err)
+			return nil
 		}
 		// this means that we don't have the tree locally and therefore can't return it
 		if s.isEmptyFullSyncRequest(treeMsg) {
-			err = treechangeproto.ErrGetTree
-			s.sendError(ctx, nil, treechangeproto.ErrGetTree, senderId, msg.ObjectId, msg.RequestId)
-			return fmt.Errorf("failed to get tree from storage on full sync: %w", err)
+			return treechangeproto.ErrGetTree
 		}
 	}
-	obj, err := s.objectGetter.GetObject(ctx, msg.ObjectId)
-	if err != nil {
-		// TODO: write tests for object sync https://linear.app/anytype/issue/GO-1299/write-tests-for-commonspaceobjectsync
-		s.unmarshallSendError(ctx, msg, spacesyncproto.ErrUnexpected, senderId, msg.ObjectId)
-		return fmt.Errorf("failed to get object from cache: %w", err)
-	}
-	// TODO: unmarshall earlier
-	err = obj.HandleMessage(ctx, senderId, msg)
-	if err != nil {
-		s.unmarshallSendError(ctx, msg, spacesyncproto.ErrUnexpected, senderId, msg.ObjectId)
-		return fmt.Errorf("failed to handle message: %w", err)
-	}
 	return
 }
 
-func (s *objectSync) SyncClient() SyncClient {
-	return s.syncClient
-}
-
-func (s *objectSync) unmarshallSendError(ctx context.Context, msg *spacesyncproto.ObjectSyncMessage, respErr error, senderId, objectId string) {
-	unmarshalled := &treechangeproto.TreeSyncMessage{}
-	err := proto.Unmarshal(msg.Payload, unmarshalled)
-	if err != nil {
-		return
-	}
-	s.sendError(ctx, unmarshalled.RootChange, respErr, senderId, objectId, msg.RequestId)
-}
-
-func (s *objectSync) sendError(ctx context.Context, root *treechangeproto.RawTreeChangeWithId, respErr error, senderId, objectId, replyId string) {
-	// we don't send errors if have no reply id, this can lead to bugs and also nobody needs this error
-	if replyId == "" {
-		return
-	}
-	resp := treechangeproto.WrapError(respErr, root)
-	if err := s.syncClient.SendWithReply(ctx, senderId, objectId, resp, replyId); err != nil {
-		log.InfoCtx(ctx, "failed to send error to client")
-	}
-}
-
 func (s *objectSync) isEmptyFullSyncRequest(msg *treechangeproto.TreeSyncMessage) bool {
 	return msg.GetContent().GetFullSyncRequest() != nil && len(msg.GetContent().GetFullSyncRequest().GetHeads()) == 0
 }

commonspace/objectsync/syncclient.go

@@ -1,78 +0,0 @@
-package objectsync
-
-import (
-	"context"
-	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
-	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	"go.uber.org/zap"
-)
-
-type SyncClient interface {
-	RequestFactory
-	Broadcast(ctx context.Context, msg *treechangeproto.TreeSyncMessage)
-	SendWithReply(ctx context.Context, peerId, objectId string, msg *treechangeproto.TreeSyncMessage, replyId string) (err error)
-	SendSync(ctx context.Context, peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error)
-	MessagePool() MessagePool
-}
-
-type syncClient struct {
-	RequestFactory
-	spaceId     string
-	messagePool MessagePool
-}
-
-func NewSyncClient(
-	spaceId string,
-	messagePool MessagePool,
-	factory RequestFactory) SyncClient {
-	return &syncClient{
-		messagePool:    messagePool,
-		RequestFactory: factory,
-		spaceId:        spaceId,
-	}
-}
-
-func (s *syncClient) Broadcast(ctx context.Context, msg *treechangeproto.TreeSyncMessage) {
-	objMsg, err := MarshallTreeMessage(msg, s.spaceId, msg.RootChange.Id, "")
-	if err != nil {
-		return
-	}
-	err = s.messagePool.Broadcast(ctx, objMsg)
-	if err != nil {
-		log.DebugCtx(ctx, "broadcast error", zap.Error(err))
-	}
-}
-
-func (s *syncClient) SendSync(ctx context.Context, peerId, objectId string, msg *treechangeproto.TreeSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
-	objMsg, err := MarshallTreeMessage(msg, s.spaceId, objectId, "")
-	if err != nil {
-		return
-	}
-	return s.messagePool.SendSync(ctx, peerId, objMsg)
-}
-
-func (s *syncClient) SendWithReply(ctx context.Context, peerId, objectId string, msg *treechangeproto.TreeSyncMessage, replyId string) (err error) {
-	objMsg, err := MarshallTreeMessage(msg, s.spaceId, objectId, replyId)
-	if err != nil {
-		return
-	}
-	return s.messagePool.SendPeer(ctx, peerId, objMsg)
-}
-
-func (s *syncClient) MessagePool() MessagePool {
-	return s.messagePool
-}
-
-func MarshallTreeMessage(message *treechangeproto.TreeSyncMessage, spaceId, objectId, replyId string) (objMsg *spacesyncproto.ObjectSyncMessage, err error) {
-	payload, err := message.Marshal()
-	if err != nil {
-		return
-	}
-	objMsg = &spacesyncproto.ObjectSyncMessage{
-		ReplyId:  replyId,
-		Payload:  payload,
-		ObjectId: objectId,
-		SpaceId:  spaceId,
-	}
-	return
-}

commonspace/objectsync/synchandler/synchhandler.go

@@ -6,5 +6,6 @@ import (
 )
 
 type SyncHandler interface {
-	HandleMessage(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (err error)
+	HandleMessage(ctx context.Context, senderId string, message *spacesyncproto.ObjectSyncMessage) (err error)
+	HandleRequest(ctx context.Context, senderId string, request *spacesyncproto.ObjectSyncMessage) (response *spacesyncproto.ObjectSyncMessage, err error)
 }

commonspace/objecttreebuilder/mock_objecttreebuilder/mock_objecttreebuilder.go

@@ -0,0 +1,99 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/anyproto/any-sync/commonspace/objecttreebuilder (interfaces: TreeBuilder)
+
+// Package mock_objecttreebuilder is a generated GoMock package.
+package mock_objecttreebuilder
+
+import (
+	context "context"
+	reflect "reflect"
+
+	objecttree "github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	updatelistener "github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
+	treestorage "github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
+	objecttreebuilder "github.com/anyproto/any-sync/commonspace/objecttreebuilder"
+	gomock "go.uber.org/mock/gomock"
+)
+
+// MockTreeBuilder is a mock of TreeBuilder interface.
+type MockTreeBuilder struct {
+	ctrl     *gomock.Controller
+	recorder *MockTreeBuilderMockRecorder
+}
+
+// MockTreeBuilderMockRecorder is the mock recorder for MockTreeBuilder.
+type MockTreeBuilderMockRecorder struct {
+	mock *MockTreeBuilder
+}
+
+// NewMockTreeBuilder creates a new mock instance.
+func NewMockTreeBuilder(ctrl *gomock.Controller) *MockTreeBuilder {
+	mock := &MockTreeBuilder{ctrl: ctrl}
+	mock.recorder = &MockTreeBuilderMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockTreeBuilder) EXPECT() *MockTreeBuilderMockRecorder {
+	return m.recorder
+}
+
+// BuildHistoryTree mocks base method.
+func (m *MockTreeBuilder) BuildHistoryTree(arg0 context.Context, arg1 string, arg2 objecttreebuilder.HistoryTreeOpts) (objecttree.HistoryTree, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "BuildHistoryTree", arg0, arg1, arg2)
+	ret0, _ := ret[0].(objecttree.HistoryTree)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// BuildHistoryTree indicates an expected call of BuildHistoryTree.
+func (mr *MockTreeBuilderMockRecorder) BuildHistoryTree(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "BuildHistoryTree", reflect.TypeOf((*MockTreeBuilder)(nil).BuildHistoryTree), arg0, arg1, arg2)
+}
+
+// BuildTree mocks base method.
+func (m *MockTreeBuilder) BuildTree(arg0 context.Context, arg1 string, arg2 objecttreebuilder.BuildTreeOpts) (objecttree.ObjectTree, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "BuildTree", arg0, arg1, arg2)
+	ret0, _ := ret[0].(objecttree.ObjectTree)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// BuildTree indicates an expected call of BuildTree.
+func (mr *MockTreeBuilderMockRecorder) BuildTree(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "BuildTree", reflect.TypeOf((*MockTreeBuilder)(nil).BuildTree), arg0, arg1, arg2)
+}
+
+// CreateTree mocks base method.
+func (m *MockTreeBuilder) CreateTree(arg0 context.Context, arg1 objecttree.ObjectTreeCreatePayload) (treestorage.TreeStorageCreatePayload, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "CreateTree", arg0, arg1)
+	ret0, _ := ret[0].(treestorage.TreeStorageCreatePayload)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// CreateTree indicates an expected call of CreateTree.
+func (mr *MockTreeBuilderMockRecorder) CreateTree(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateTree", reflect.TypeOf((*MockTreeBuilder)(nil).CreateTree), arg0, arg1)
+}
+
+// PutTree mocks base method.
+func (m *MockTreeBuilder) PutTree(arg0 context.Context, arg1 treestorage.TreeStorageCreatePayload, arg2 updatelistener.UpdateListener) (objecttree.ObjectTree, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "PutTree", arg0, arg1, arg2)
+	ret0, _ := ret[0].(objecttree.ObjectTree)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// PutTree indicates an expected call of PutTree.
+func (mr *MockTreeBuilderMockRecorder) PutTree(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "PutTree", reflect.TypeOf((*MockTreeBuilder)(nil).PutTree), arg0, arg1, arg2)
+}

commonspace/objecttreebuilder/treebuilder.go

@@ -0,0 +1,204 @@
+//go:generate mockgen -destination mock_objecttreebuilder/mock_objecttreebuilder.go github.com/anyproto/any-sync/commonspace/objecttreebuilder TreeBuilder
+package objecttreebuilder
+
+import (
+	"context"
+	"errors"
+	"sync/atomic"
+
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/headsync"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
+	"github.com/anyproto/any-sync/commonspace/objectsync"
+	"github.com/anyproto/any-sync/commonspace/peermanager"
+	"github.com/anyproto/any-sync/commonspace/requestmanager"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
+	"github.com/anyproto/any-sync/commonspace/spacestorage"
+	"github.com/anyproto/any-sync/commonspace/syncstatus"
+	"github.com/anyproto/any-sync/nodeconf"
+	"go.uber.org/zap"
+)
+
+type BuildTreeOpts struct {
+	Listener    updatelistener.UpdateListener
+	TreeBuilder objecttree.BuildObjectTreeFunc
+}
+
+const CName = "common.commonspace.objecttreebuilder"
+
+var log = logger.NewNamed(CName)
+var ErrSpaceClosed = errors.New("space is closed")
+
+type HistoryTreeOpts struct {
+	BeforeId      string
+	Include       bool
+	BuildFullTree bool
+}
+
+type TreeBuilder interface {
+	BuildTree(ctx context.Context, id string, opts BuildTreeOpts) (t objecttree.ObjectTree, err error)
+	BuildHistoryTree(ctx context.Context, id string, opts HistoryTreeOpts) (t objecttree.HistoryTree, err error)
+	CreateTree(ctx context.Context, payload objecttree.ObjectTreeCreatePayload) (res treestorage.TreeStorageCreatePayload, err error)
+	PutTree(ctx context.Context, payload treestorage.TreeStorageCreatePayload, listener updatelistener.UpdateListener) (t objecttree.ObjectTree, err error)
+}
+
+type TreeBuilderComponent interface {
+	app.Component
+	TreeBuilder
+}
+
+func New() TreeBuilderComponent {
+	return &treeBuilder{}
+}
+
+type treeBuilder struct {
+	syncClient      synctree.SyncClient
+	configuration   nodeconf.NodeConf
+	headsNotifiable synctree.HeadNotifiable
+	peerManager     peermanager.PeerManager
+	requestManager  requestmanager.RequestManager
+	spaceStorage    spacestorage.SpaceStorage
+	syncStatus      syncstatus.StatusUpdater
+	objectSync      objectsync.ObjectSync
+
+	log       logger.CtxLogger
+	builder   objecttree.BuildObjectTreeFunc
+	spaceId   string
+	aclList   list.AclList
+	treesUsed *atomic.Int32
+	isClosed  *atomic.Bool
+}
+
+func (t *treeBuilder) Init(a *app.App) (err error) {
+	state := a.MustComponent(spacestate.CName).(*spacestate.SpaceState)
+	t.spaceId = state.SpaceId
+	t.isClosed = state.SpaceIsClosed
+	t.treesUsed = state.TreesUsed
+	t.builder = state.TreeBuilderFunc
+	t.aclList = a.MustComponent(syncacl.CName).(syncacl.SyncAcl)
+	t.spaceStorage = a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	t.configuration = a.MustComponent(nodeconf.CName).(nodeconf.NodeConf)
+	t.headsNotifiable = a.MustComponent(headsync.CName).(headsync.HeadSync)
+	t.syncStatus = a.MustComponent(syncstatus.CName).(syncstatus.StatusUpdater)
+	t.peerManager = a.MustComponent(peermanager.CName).(peermanager.PeerManager)
+	t.requestManager = a.MustComponent(requestmanager.CName).(requestmanager.RequestManager)
+	t.objectSync = a.MustComponent(objectsync.CName).(objectsync.ObjectSync)
+	t.log = log.With(zap.String("spaceId", t.spaceId))
+	t.syncClient = synctree.NewSyncClient(t.spaceId, t.requestManager, t.peerManager)
+	return nil
+}
+
+func (t *treeBuilder) Name() (name string) {
+	return CName
+}
+
+func (t *treeBuilder) BuildTree(ctx context.Context, id string, opts BuildTreeOpts) (ot objecttree.ObjectTree, err error) {
+	if t.isClosed.Load() {
+		// TODO: change to real error
+		err = ErrSpaceClosed
+		return
+	}
+	treeBuilder := opts.TreeBuilder
+	if treeBuilder == nil {
+		treeBuilder = t.builder
+	}
+	deps := synctree.BuildDeps{
+		SpaceId:         t.spaceId,
+		SyncClient:      t.syncClient,
+		Configuration:   t.configuration,
+		HeadNotifiable:  t.headsNotifiable,
+		Listener:        opts.Listener,
+		AclList:         t.aclList,
+		SpaceStorage:    t.spaceStorage,
+		OnClose:         t.onClose,
+		SyncStatus:      t.syncStatus,
+		PeerGetter:      t.peerManager,
+		BuildObjectTree: treeBuilder,
+	}
+	t.treesUsed.Add(1)
+	t.log.Debug("incrementing counter", zap.String("id", id), zap.Int32("trees", t.treesUsed.Load()))
+	if ot, err = synctree.BuildSyncTreeOrGetRemote(ctx, id, deps); err != nil {
+		t.treesUsed.Add(-1)
+		t.log.Debug("decrementing counter, load failed", zap.String("id", id), zap.Int32("trees", t.treesUsed.Load()), zap.Error(err))
+		return nil, err
+	}
+	return
+}
+
+func (t *treeBuilder) BuildHistoryTree(ctx context.Context, id string, opts HistoryTreeOpts) (ot objecttree.HistoryTree, err error) {
+	if t.isClosed.Load() {
+		// TODO: change to real error
+		err = ErrSpaceClosed
+		return
+	}
+
+	params := objecttree.HistoryTreeParams{
+		AclList:         t.aclList,
+		BeforeId:        opts.BeforeId,
+		IncludeBeforeId: opts.Include,
+		BuildFullTree:   opts.BuildFullTree,
+	}
+	params.TreeStorage, err = t.spaceStorage.TreeStorage(id)
+	if err != nil {
+		return
+	}
+	return objecttree.BuildHistoryTree(params)
+}
+
+func (t *treeBuilder) CreateTree(ctx context.Context, payload objecttree.ObjectTreeCreatePayload) (res treestorage.TreeStorageCreatePayload, err error) {
+	if t.isClosed.Load() {
+		err = ErrSpaceClosed
+		return
+	}
+	root, err := objecttree.CreateObjectTreeRoot(payload, t.aclList)
+	if err != nil {
+		return
+	}
+
+	res = treestorage.TreeStorageCreatePayload{
+		RootRawChange: root,
+		Changes:       []*treechangeproto.RawTreeChangeWithId{root},
+		Heads:         []string{root.Id},
+	}
+	return
+}
+
+func (t *treeBuilder) PutTree(ctx context.Context, payload treestorage.TreeStorageCreatePayload, listener updatelistener.UpdateListener) (ot objecttree.ObjectTree, err error) {
+	if t.isClosed.Load() {
+		err = ErrSpaceClosed
+		return
+	}
+	deps := synctree.BuildDeps{
+		SpaceId:         t.spaceId,
+		SyncClient:      t.syncClient,
+		Configuration:   t.configuration,
+		HeadNotifiable:  t.headsNotifiable,
+		Listener:        listener,
+		AclList:         t.aclList,
+		SpaceStorage:    t.spaceStorage,
+		OnClose:         t.onClose,
+		SyncStatus:      t.syncStatus,
+		PeerGetter:      t.peerManager,
+		BuildObjectTree: t.builder,
+	}
+	ot, err = synctree.PutSyncTree(ctx, payload, deps)
+	if err != nil {
+		return
+	}
+	t.treesUsed.Add(1)
+	t.log.Debug("incrementing counter", zap.String("id", payload.RootRawChange.Id), zap.Int32("trees", t.treesUsed.Load()))
+	return
+}
+
+func (t *treeBuilder) onClose(id string) {
+	t.treesUsed.Add(-1)
+	log.Debug("decrementing counter", zap.String("id", id), zap.Int32("trees", t.treesUsed.Load()), zap.String("spaceId", t.spaceId))
+	_ = t.objectSync.CloseThread(id)
+}

commonspace/payloads.go

@@ -2,20 +2,22 @@ package commonspace
 
 import (
 	"errors"
+	"hash/fnv"
+	"math/rand"
+	"strconv"
+	"strings"
+	"time"
+
 	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 	"github.com/anyproto/any-sync/util/cidutil"
 	"github.com/anyproto/any-sync/util/crypto"
 	"github.com/gogo/protobuf/proto"
-	"hash/fnv"
-	"math/rand"
-	"strconv"
-	"strings"
-	"time"
 )
 
 const (
@@ -71,7 +73,7 @@ func storagePayloadForSpaceCreate(payload SpaceCreatePayload) (storagePayload sp
 
 	// building acl root
 	keyStorage := crypto.NewKeyStorage()
-	aclBuilder := list.NewAclRecordBuilder("", keyStorage)
+	aclBuilder := list.NewAclRecordBuilder("", keyStorage, nil, list.NoOpAcceptorVerifier{})
 	aclRoot, err := aclBuilder.BuildRoot(list.RootContent{
 		PrivKey:          payload.SigningKey,
 		MasterKey:        payload.MasterKey,
@@ -158,7 +160,7 @@ func storagePayloadForSpaceDerive(payload SpaceDerivePayload) (storagePayload sp
 
 	// building acl root
 	keyStorage := crypto.NewKeyStorage()
-	aclBuilder := list.NewAclRecordBuilder("", keyStorage)
+	aclBuilder := list.NewAclRecordBuilder("", keyStorage, nil, list.NoOpAcceptorVerifier{})
 	aclRoot, err := aclBuilder.BuildRoot(list.RootContent{
 		PrivKey:   payload.SigningKey,
 		MasterKey: payload.MasterKey,
@@ -214,14 +216,15 @@ func validateSpaceStorageCreatePayload(payload spacestorage.SpaceStorageCreatePa
 }
 
 func ValidateSpaceHeader(rawHeaderWithId *spacesyncproto.RawSpaceHeaderWithId, identity crypto.PubKey) (err error) {
+	if rawHeaderWithId == nil {
+		return spacestorage.ErrIncorrectSpaceHeader
+	}
 	sepIdx := strings.Index(rawHeaderWithId.Id, ".")
 	if sepIdx == -1 {
-		err = spacestorage.ErrIncorrectSpaceHeader
-		return
+		return spacestorage.ErrIncorrectSpaceHeader
 	}
 	if !cidutil.VerifyCid(rawHeaderWithId.RawHeader, rawHeaderWithId.Id[:sepIdx]) {
-		err = objecttree.ErrIncorrectCid
-		return
+		return objecttree.ErrIncorrectCid
 	}
 	var rawSpaceHeader spacesyncproto.RawSpaceHeader
 	err = proto.Unmarshal(rawHeaderWithId.RawHeader, &rawSpaceHeader)
@@ -239,29 +242,26 @@ func ValidateSpaceHeader(rawHeaderWithId *spacesyncproto.RawSpaceHeaderWithId, i
 	}
 	res, err := payloadIdentity.Verify(rawSpaceHeader.SpaceHeader, rawSpaceHeader.Signature)
 	if err != nil || !res {
-		err = spacestorage.ErrIncorrectSpaceHeader
-		return
+		return spacestorage.ErrIncorrectSpaceHeader
 	}
 	if rawHeaderWithId.Id[sepIdx+1:] != strconv.FormatUint(header.ReplicationKey, 36) {
-		err = spacestorage.ErrIncorrectSpaceHeader
-		return
+		return spacestorage.ErrIncorrectSpaceHeader
 	}
 	if identity == nil {
 		return
 	}
 	if !payloadIdentity.Equals(identity) {
-		err = ErrIncorrectIdentity
-		return
+		return ErrIncorrectIdentity
 	}
 	return
 }
 
-func validateCreateSpaceAclPayload(rawWithId *aclrecordproto.RawAclRecordWithId) (spaceId string, err error) {
+func validateCreateSpaceAclPayload(rawWithId *consensusproto.RawRecordWithId) (spaceId string, err error) {
 	if !cidutil.VerifyCid(rawWithId.Payload, rawWithId.Id) {
 		err = objecttree.ErrIncorrectCid
 		return
 	}
-	var rawAcl aclrecordproto.RawAclRecord
+	var rawAcl consensusproto.RawRecord
 	err = proto.Unmarshal(rawWithId.Payload, &rawAcl)
 	if err != nil {
 		return

commonspace/payloads_test.go

@@ -2,20 +2,22 @@ package commonspace
 
 import (
 	"fmt"
+	"math/rand"
+	"strconv"
+	"testing"
+	"time"
+
 	"github.com/anyproto/any-sync/commonspace/object/accountdata"
 	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 	"github.com/anyproto/any-sync/util/cidutil"
 	"github.com/anyproto/any-sync/util/crypto"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"math/rand"
-	"strconv"
-	"testing"
-	"time"
 )
 
 func TestSuccessHeaderPayloadForSpaceCreate(t *testing.T) {
@@ -188,14 +190,14 @@ func TestFailAclPayloadSpace_IncorrectCid(t *testing.T) {
 	marshalled, err := aclRoot.Marshal()
 	require.NoError(t, err)
 	signature, err := accountKeys.SignKey.Sign(marshalled)
-	rawAclRecord := &aclrecordproto.RawAclRecord{
+	rawAclRecord := &consensusproto.RawRecord{
 		Payload:   marshalled,
 		Signature: signature,
 	}
 	marshalledRaw, err := rawAclRecord.Marshal()
 	require.NoError(t, err)
 	aclHeadId := "rand"
-	rawWithId := &aclrecordproto.RawAclRecordWithId{
+	rawWithId := &consensusproto.RawRecordWithId{
 		Payload: marshalledRaw,
 		Id:      aclHeadId,
 	}
@@ -230,7 +232,7 @@ func TestFailedAclPayloadSpace_IncorrectSignature(t *testing.T) {
 	}
 	marshalled, err := aclRoot.Marshal()
 	require.NoError(t, err)
-	rawAclRecord := &aclrecordproto.RawAclRecord{
+	rawAclRecord := &consensusproto.RawRecord{
 		Payload:   marshalled,
 		Signature: marshalled,
 	}
@@ -238,7 +240,7 @@ func TestFailedAclPayloadSpace_IncorrectSignature(t *testing.T) {
 	require.NoError(t, err)
 	aclHeadId, err := cidutil.NewCidFromBytes(marshalledRaw)
 	require.NoError(t, err)
-	rawWithId := &aclrecordproto.RawAclRecordWithId{
+	rawWithId := &consensusproto.RawRecordWithId{
 		Payload: marshalledRaw,
 		Id:      aclHeadId,
 	}
@@ -286,7 +288,7 @@ func TestFailedAclPayloadSpace_IncorrectIdentitySignature(t *testing.T) {
 		return
 	}
 	signature, err := accountKeys.SignKey.Sign(marshalled)
-	rawAclRecord := &aclrecordproto.RawAclRecord{
+	rawAclRecord := &consensusproto.RawRecord{
 		Payload:   marshalled,
 		Signature: signature,
 	}
@@ -298,7 +300,7 @@ func TestFailedAclPayloadSpace_IncorrectIdentitySignature(t *testing.T) {
 	if err != nil {
 		return
 	}
-	rawWithId := &aclrecordproto.RawAclRecordWithId{
+	rawWithId := &consensusproto.RawRecordWithId{
 		Payload: marshalledRaw,
 		Id:      aclHeadId,
 	}
@@ -540,7 +542,7 @@ func rawSettingsPayload(accountKeys *accountdata.AccountKeys, spaceId, aclHeadId
 	return
 }
 
-func rawAclWithId(accountKeys *accountdata.AccountKeys, spaceId string) (aclHeadId string, rawWithId *aclrecordproto.RawAclRecordWithId, err error) {
+func rawAclWithId(accountKeys *accountdata.AccountKeys, spaceId string) (aclHeadId string, rawWithId *consensusproto.RawRecordWithId, err error) {
 	// TODO: use same storage creation methods as we use in spaces
 	readKeyBytes := make([]byte, 32)
 	_, err = rand.Read(readKeyBytes)
@@ -582,7 +584,7 @@ func rawAclWithId(accountKeys *accountdata.AccountKeys, spaceId string) (aclHead
 		return
 	}
 	signature, err := accountKeys.SignKey.Sign(marshalled)
-	rawAclRecord := &aclrecordproto.RawAclRecord{
+	rawAclRecord := &consensusproto.RawRecord{
 		Payload:   marshalled,
 		Signature: signature,
 	}
@@ -594,7 +596,7 @@ func rawAclWithId(accountKeys *accountdata.AccountKeys, spaceId string) (aclHead
 	if err != nil {
 		return
 	}
-	rawWithId = &aclrecordproto.RawAclRecordWithId{
+	rawWithId = &consensusproto.RawRecordWithId{
 		Payload: marshalledRaw,
 		Id:      aclHeadId,
 	}

commonspace/peermanager/mock_peermanager/mock_peermanager.go

@@ -8,9 +8,10 @@ import (
 	context "context"
 	reflect "reflect"
 
+	app "github.com/anyproto/any-sync/app"
 	spacesyncproto "github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	peer "github.com/anyproto/any-sync/net/peer"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockPeerManager is a mock of PeerManager interface.
@@ -50,6 +51,21 @@ func (mr *MockPeerManagerMockRecorder) Broadcast(arg0, arg1 interface{}) *gomock
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Broadcast", reflect.TypeOf((*MockPeerManager)(nil).Broadcast), arg0, arg1)
 }
 
+// GetNodePeers mocks base method.
+func (m *MockPeerManager) GetNodePeers(arg0 context.Context) ([]peer.Peer, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetNodePeers", arg0)
+	ret0, _ := ret[0].([]peer.Peer)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetNodePeers indicates an expected call of GetNodePeers.
+func (mr *MockPeerManagerMockRecorder) GetNodePeers(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetNodePeers", reflect.TypeOf((*MockPeerManager)(nil).GetNodePeers), arg0)
+}
+
 // GetResponsiblePeers mocks base method.
 func (m *MockPeerManager) GetResponsiblePeers(arg0 context.Context) ([]peer.Peer, error) {
 	m.ctrl.T.Helper()
@@ -65,6 +81,34 @@ func (mr *MockPeerManagerMockRecorder) GetResponsiblePeers(arg0 interface{}) *go
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetResponsiblePeers", reflect.TypeOf((*MockPeerManager)(nil).GetResponsiblePeers), arg0)
 }
 
+// Init mocks base method.
+func (m *MockPeerManager) Init(arg0 *app.App) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Init", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Init indicates an expected call of Init.
+func (mr *MockPeerManagerMockRecorder) Init(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockPeerManager)(nil).Init), arg0)
+}
+
+// Name mocks base method.
+func (m *MockPeerManager) Name() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Name")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Name indicates an expected call of Name.
+func (mr *MockPeerManagerMockRecorder) Name() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Name", reflect.TypeOf((*MockPeerManager)(nil).Name))
+}
+
 // SendPeer mocks base method.
 func (m *MockPeerManager) SendPeer(arg0 context.Context, arg1 string, arg2 *spacesyncproto.ObjectSyncMessage) error {
 	m.ctrl.T.Helper()

commonspace/peermanager/peermanager.go

@@ -8,15 +8,20 @@ import (
 	"github.com/anyproto/any-sync/net/peer"
 )
 
-const CName = "common.commonspace.peermanager"
+const (
+	CName = "common.commonspace.peermanager"
+)
 
 type PeerManager interface {
+	app.Component
 	// SendPeer sends a message to a stream by peerId
 	SendPeer(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (err error)
 	// Broadcast sends a message to all subscribed peers
 	Broadcast(ctx context.Context, msg *spacesyncproto.ObjectSyncMessage) (err error)
-	// GetResponsiblePeers dials or gets from cache responsible peers to unary operations
+	// GetResponsiblePeers dials or gets from cache responsible peers
 	GetResponsiblePeers(ctx context.Context) (peers []peer.Peer, err error)
+	// GetNodePeers dials or gets from cache node peers
+	GetNodePeers(ctx context.Context) (peers []peer.Peer, err error)
 }
 
 type PeerManagerProvider interface {

commonspace/requestmanager/requestmanager.go

@@ -0,0 +1,129 @@
+package requestmanager
+
+import (
+	"context"
+	"sync"
+
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/objectsync"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/net/peer"
+	"github.com/anyproto/any-sync/net/pool"
+	"github.com/anyproto/any-sync/net/rpc/rpcerr"
+	"github.com/anyproto/any-sync/net/streampool"
+	"go.uber.org/zap"
+	"storj.io/drpc"
+)
+
+const CName = "common.commonspace.requestmanager"
+
+var log = logger.NewNamed(CName)
+
+type RequestManager interface {
+	app.ComponentRunnable
+	SendRequest(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error)
+	QueueRequest(peerId string, msg *spacesyncproto.ObjectSyncMessage) (err error)
+}
+
+func New() RequestManager {
+	return &requestManager{
+		workers:   10,
+		queueSize: 300,
+		pools:     map[string]*streampool.ExecPool{},
+	}
+}
+
+type MessageHandler interface {
+	HandleMessage(ctx context.Context, hm objectsync.HandleMessage) (err error)
+}
+
+type requestManager struct {
+	sync.Mutex
+	pools         map[string]*streampool.ExecPool
+	peerPool      pool.Pool
+	workers       int
+	queueSize     int
+	handler       MessageHandler
+	ctx           context.Context
+	cancel        context.CancelFunc
+	clientFactory spacesyncproto.ClientFactory
+}
+
+func (r *requestManager) Init(a *app.App) (err error) {
+	r.ctx, r.cancel = context.WithCancel(context.Background())
+	r.handler = a.MustComponent(objectsync.CName).(MessageHandler)
+	r.peerPool = a.MustComponent(pool.CName).(pool.Pool)
+	r.clientFactory = spacesyncproto.ClientFactoryFunc(spacesyncproto.NewDRPCSpaceSyncClient)
+	return
+}
+
+func (r *requestManager) Name() (name string) {
+	return CName
+}
+
+func (r *requestManager) Run(ctx context.Context) (err error) {
+	return nil
+}
+
+func (r *requestManager) Close(ctx context.Context) (err error) {
+	r.Lock()
+	defer r.Unlock()
+	r.cancel()
+	for _, p := range r.pools {
+		_ = p.Close()
+	}
+	return nil
+}
+
+func (r *requestManager) SendRequest(ctx context.Context, peerId string, req *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
+	// TODO: limit concurrent sends?
+	return r.doRequest(ctx, peerId, req)
+}
+
+func (r *requestManager) QueueRequest(peerId string, req *spacesyncproto.ObjectSyncMessage) (err error) {
+	r.Lock()
+	defer r.Unlock()
+	pl, exists := r.pools[peerId]
+	if !exists {
+		pl = streampool.NewExecPool(r.workers, r.queueSize)
+		r.pools[peerId] = pl
+		pl.Run()
+	}
+	// TODO: for later think when many clients are there,
+	//  we need to close pools for inactive clients
+	return pl.TryAdd(func() {
+		doRequestAndHandle(r, peerId, req)
+	})
+}
+
+var doRequestAndHandle = (*requestManager).requestAndHandle
+
+func (r *requestManager) requestAndHandle(peerId string, req *spacesyncproto.ObjectSyncMessage) {
+	ctx := r.ctx
+	resp, err := r.doRequest(ctx, peerId, req)
+	if err != nil {
+		log.Warn("failed to send request", zap.Error(err))
+		return
+	}
+	ctx = peer.CtxWithPeerId(ctx, peerId)
+	_ = r.handler.HandleMessage(ctx, objectsync.HandleMessage{
+		SenderId: peerId,
+		Message:  resp,
+		PeerCtx:  ctx,
+	})
+}
+
+func (r *requestManager) doRequest(ctx context.Context, peerId string, msg *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
+	pr, err := r.peerPool.Get(ctx, peerId)
+	if err != nil {
+		return
+	}
+	err = pr.DoDrpc(ctx, func(conn drpc.Conn) error {
+		cl := r.clientFactory.Client(conn)
+		resp, err = cl.ObjectSync(ctx, msg)
+		return err
+	})
+	err = rpcerr.Unwrap(err)
+	return
+}

commonspace/requestmanager/requestmanager_test.go

@@ -0,0 +1,186 @@
+package requestmanager
+
+import (
+	"context"
+	"sync"
+	"testing"
+
+	"github.com/anyproto/any-sync/commonspace/objectsync"
+	"github.com/anyproto/any-sync/commonspace/objectsync/mock_objectsync"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto/mock_spacesyncproto"
+	"github.com/anyproto/any-sync/net/peer"
+	"github.com/anyproto/any-sync/net/peer/mock_peer"
+	"github.com/anyproto/any-sync/net/pool/mock_pool"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
+	"storj.io/drpc"
+	"storj.io/drpc/drpcconn"
+)
+
+type fixture struct {
+	requestManager     *requestManager
+	messageHandlerMock *mock_objectsync.MockObjectSync
+	peerPoolMock       *mock_pool.MockPool
+	clientMock         *mock_spacesyncproto.MockDRPCSpaceSyncClient
+	ctrl               *gomock.Controller
+}
+
+func newFixture(t *testing.T) *fixture {
+	ctrl := gomock.NewController(t)
+	manager := New().(*requestManager)
+	peerPoolMock := mock_pool.NewMockPool(ctrl)
+	messageHandlerMock := mock_objectsync.NewMockObjectSync(ctrl)
+	clientMock := mock_spacesyncproto.NewMockDRPCSpaceSyncClient(ctrl)
+	manager.peerPool = peerPoolMock
+	manager.handler = messageHandlerMock
+	manager.clientFactory = spacesyncproto.ClientFactoryFunc(func(cc drpc.Conn) spacesyncproto.DRPCSpaceSyncClient {
+		return clientMock
+	})
+	manager.ctx, manager.cancel = context.WithCancel(context.Background())
+	return &fixture{
+		requestManager:     manager,
+		messageHandlerMock: messageHandlerMock,
+		peerPoolMock:       peerPoolMock,
+		clientMock:         clientMock,
+		ctrl:               ctrl,
+	}
+}
+
+func (fx *fixture) stop() {
+	fx.ctrl.Finish()
+}
+
+func TestRequestManager_SyncRequest(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("send request", func(t *testing.T) {
+		fx := newFixture(t)
+		defer fx.stop()
+
+		peerId := "peerId"
+		peerMock := mock_peer.NewMockPeer(fx.ctrl)
+		conn := &drpcconn.Conn{}
+		msg := &spacesyncproto.ObjectSyncMessage{}
+		resp := &spacesyncproto.ObjectSyncMessage{}
+		fx.peerPoolMock.EXPECT().Get(ctx, peerId).Return(peerMock, nil)
+		fx.clientMock.EXPECT().ObjectSync(ctx, msg).Return(resp, nil)
+		peerMock.EXPECT().DoDrpc(ctx, gomock.Any()).DoAndReturn(func(ctx context.Context, drpcHandler func(conn drpc.Conn) error) {
+			drpcHandler(conn)
+		}).Return(nil)
+		res, err := fx.requestManager.SendRequest(ctx, peerId, msg)
+		require.NoError(t, err)
+		require.Equal(t, resp, res)
+	})
+
+	t.Run("request and handle", func(t *testing.T) {
+		fx := newFixture(t)
+		defer fx.stop()
+		ctx = fx.requestManager.ctx
+
+		peerId := "peerId"
+		peerMock := mock_peer.NewMockPeer(fx.ctrl)
+		conn := &drpcconn.Conn{}
+		msg := &spacesyncproto.ObjectSyncMessage{}
+		resp := &spacesyncproto.ObjectSyncMessage{}
+		fx.peerPoolMock.EXPECT().Get(ctx, peerId).Return(peerMock, nil)
+		fx.clientMock.EXPECT().ObjectSync(ctx, msg).Return(resp, nil)
+		peerMock.EXPECT().DoDrpc(ctx, gomock.Any()).DoAndReturn(func(ctx context.Context, drpcHandler func(conn drpc.Conn) error) {
+			drpcHandler(conn)
+		}).Return(nil)
+		fx.messageHandlerMock.EXPECT().HandleMessage(gomock.Any(), gomock.Any()).DoAndReturn(func(ctx context.Context, msg objectsync.HandleMessage) {
+			require.Equal(t, peerId, msg.SenderId)
+			require.Equal(t, resp, msg.Message)
+			pId, _ := peer.CtxPeerId(msg.PeerCtx)
+			require.Equal(t, peerId, pId)
+		}).Return(nil)
+		fx.requestManager.requestAndHandle(peerId, msg)
+	})
+}
+
+func TestRequestManager_QueueRequest(t *testing.T) {
+	t.Run("max concurrent reqs for peer, independent reqs for other peer", func(t *testing.T) {
+		// testing 2 concurrent requests to one peer and simultaneous to another peer
+		fx := newFixture(t)
+		defer fx.stop()
+		fx.requestManager.workers = 2
+		msgRelease := make(chan struct{})
+		msgWait := make(chan struct{})
+		msgs := sync.Map{}
+		doRequestAndHandle = func(manager *requestManager, peerId string, req *spacesyncproto.ObjectSyncMessage) {
+			msgs.Store(req.ObjectId, struct{}{})
+			<-msgWait
+			<-msgRelease
+		}
+		otherPeer := "otherPeer"
+		msg1 := &spacesyncproto.ObjectSyncMessage{ObjectId: "id1"}
+		msg2 := &spacesyncproto.ObjectSyncMessage{ObjectId: "id2"}
+		msg3 := &spacesyncproto.ObjectSyncMessage{ObjectId: "id3"}
+		otherMsg1 := &spacesyncproto.ObjectSyncMessage{ObjectId: "otherId1"}
+
+		// sending requests to first peer
+		peerId := "peerId"
+		err := fx.requestManager.QueueRequest(peerId, msg1)
+		require.NoError(t, err)
+		err = fx.requestManager.QueueRequest(peerId, msg2)
+		require.NoError(t, err)
+		err = fx.requestManager.QueueRequest(peerId, msg3)
+		require.NoError(t, err)
+
+		// waiting until all the messages are loaded
+		msgWait <- struct{}{}
+		msgWait <- struct{}{}
+		_, ok := msgs.Load("id1")
+		require.True(t, ok)
+		_, ok = msgs.Load("id2")
+		require.True(t, ok)
+		// third message should not be read
+		_, ok = msgs.Load("id3")
+		require.False(t, ok)
+
+		// request for other peer should pass
+		err = fx.requestManager.QueueRequest(otherPeer, otherMsg1)
+		require.NoError(t, err)
+		msgWait <- struct{}{}
+
+		_, ok = msgs.Load("otherId1")
+		require.True(t, ok)
+		close(msgRelease)
+		fx.requestManager.Close(context.Background())
+	})
+
+	t.Run("no requests after close", func(t *testing.T) {
+		fx := newFixture(t)
+		defer fx.stop()
+		fx.requestManager.workers = 1
+		msgRelease := make(chan struct{})
+		msgWait := make(chan struct{})
+		msgs := sync.Map{}
+		doRequestAndHandle = func(manager *requestManager, peerId string, req *spacesyncproto.ObjectSyncMessage) {
+			msgs.Store(req.ObjectId, struct{}{})
+			<-msgWait
+			<-msgRelease
+		}
+		msg1 := &spacesyncproto.ObjectSyncMessage{ObjectId: "id1"}
+		msg2 := &spacesyncproto.ObjectSyncMessage{ObjectId: "id2"}
+
+		// sending requests to first peer
+		peerId := "peerId"
+		err := fx.requestManager.QueueRequest(peerId, msg1)
+		require.NoError(t, err)
+		err = fx.requestManager.QueueRequest(peerId, msg2)
+		require.NoError(t, err)
+
+		// waiting until all the message is loaded
+		msgWait <- struct{}{}
+		_, ok := msgs.Load("id1")
+		require.True(t, ok)
+		_, ok = msgs.Load("id2")
+		require.False(t, ok)
+
+		fx.requestManager.Close(context.Background())
+		close(msgRelease)
+		_, ok = msgs.Load("id2")
+		require.False(t, ok)
+	})
+}

commonspace/settings/deleter.go

@@ -2,9 +2,9 @@ package settings
 
 import (
 	"context"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"go.uber.org/zap"
 )
@@ -15,11 +15,11 @@ type Deleter interface {
 
 type deleter struct {
 	st     spacestorage.SpaceStorage
-	state  settingsstate.ObjectDeletionState
+	state  deletionstate.ObjectDeletionState
 	getter treemanager.TreeManager
 }
 
-func newDeleter(st spacestorage.SpaceStorage, state settingsstate.ObjectDeletionState, getter treemanager.TreeManager) Deleter {
+func newDeleter(st spacestorage.SpaceStorage, state deletionstate.ObjectDeletionState, getter treemanager.TreeManager) Deleter {
 	return &deleter{st, state, getter}
 }
 

commonspace/settings/deleter_test.go

@@ -2,11 +2,11 @@ package settings
 
 import (
 	"fmt"
+	"github.com/anyproto/any-sync/commonspace/deletionstate/mock_deletionstate"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager/mock_treemanager"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate/mock_settingsstate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage/mock_spacestorage"
-	"github.com/golang/mock/gomock"
+	"go.uber.org/mock/gomock"
 	"testing"
 )
 
@@ -14,7 +14,7 @@ func TestDeleter_Delete(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	treeManager := mock_treemanager.NewMockTreeManager(ctrl)
 	st := mock_spacestorage.NewMockSpaceStorage(ctrl)
-	delState := mock_settingsstate.NewMockObjectDeletionState(ctrl)
+	delState := mock_deletionstate.NewMockObjectDeletionState(ctrl)
 
 	deleter := newDeleter(st, delState, treeManager)
 

commonspace/settings/deletionmanager.go

@@ -2,6 +2,7 @@ package settings
 
 import (
 	"context"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager"
 	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
 	"go.uber.org/zap"
@@ -20,7 +21,7 @@ func newDeletionManager(
 	settingsId string,
 	isResponsible bool,
 	treeManager treemanager.TreeManager,
-	deletionState settingsstate.ObjectDeletionState,
+	deletionState deletionstate.ObjectDeletionState,
 	provider SpaceIdsProvider,
 	onSpaceDelete func()) DeletionManager {
 	return &deletionManager{
@@ -35,7 +36,7 @@ func newDeletionManager(
 }
 
 type deletionManager struct {
-	deletionState settingsstate.ObjectDeletionState
+	deletionState deletionstate.ObjectDeletionState
 	provider      SpaceIdsProvider
 	treeManager   treemanager.TreeManager
 	spaceId       string

commonspace/settings/deletionmanager_test.go

@@ -2,12 +2,12 @@ package settings
 
 import (
 	"context"
+	"github.com/anyproto/any-sync/commonspace/deletionstate/mock_deletionstate"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager/mock_treemanager"
 	"github.com/anyproto/any-sync/commonspace/settings/mock_settings"
 	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate/mock_settingsstate"
-	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
 	"testing"
 )
 
@@ -26,7 +26,7 @@ func TestDeletionManager_UpdateState_NotResponsible(t *testing.T) {
 	onDeleted := func() {
 		deleted = true
 	}
-	delState := mock_settingsstate.NewMockObjectDeletionState(ctrl)
+	delState := mock_deletionstate.NewMockObjectDeletionState(ctrl)
 	treeManager := mock_treemanager.NewMockTreeManager(ctrl)
 
 	delState.EXPECT().Add(state.DeletedIds)
@@ -58,7 +58,7 @@ func TestDeletionManager_UpdateState_Responsible(t *testing.T) {
 	onDeleted := func() {
 		deleted = true
 	}
-	delState := mock_settingsstate.NewMockObjectDeletionState(ctrl)
+	delState := mock_deletionstate.NewMockObjectDeletionState(ctrl)
 	treeManager := mock_treemanager.NewMockTreeManager(ctrl)
 	provider := mock_settings.NewMockSpaceIdsProvider(ctrl)
 

commonspace/settings/mock_settings/mock_settings.go

@@ -9,7 +9,7 @@ import (
 	reflect "reflect"
 
 	settingsstate "github.com/anyproto/any-sync/commonspace/settings/settingsstate"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockDeletionManager is a mock of DeletionManager interface.

commonspace/settings/settings.go

@@ -1,328 +1,122 @@
-//go:generate mockgen -destination mock_settings/mock_settings.go github.com/anyproto/any-sync/commonspace/settings DeletionManager,Deleter,SpaceIdsProvider
 package settings
 
 import (
 	"context"
-	"errors"
-	"fmt"
-	"github.com/anyproto/any-sync/util/crypto"
+	"sync/atomic"
 
 	"github.com/anyproto/any-sync/accountservice"
-	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
+	"github.com/anyproto/any-sync/commonspace/headsync"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/synctree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
+	"github.com/anyproto/any-sync/commonspace/objecttreebuilder"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
-	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/nodeconf"
-	"github.com/gogo/protobuf/proto"
 	"go.uber.org/zap"
-	"golang.org/x/exp/slices"
 )
 
-var log = logger.NewNamed("common.commonspace.settings")
+const CName = "common.commonspace.settings"
 
-type SettingsObject interface {
-	synctree.SyncTree
-	Init(ctx context.Context) (err error)
-	DeleteObject(id string) (err error)
-	DeleteSpace(ctx context.Context, raw *treechangeproto.RawTreeChangeWithId) (err error)
-	SpaceDeleteRawChange() (raw *treechangeproto.RawTreeChangeWithId, err error)
+type Settings interface {
+	DeleteTree(ctx context.Context, id string) (err error)
+	SpaceDeleteRawChange(ctx context.Context) (raw *treechangeproto.RawTreeChangeWithId, err error)
+	DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error)
+	SettingsObject() SettingsObject
+	app.ComponentRunnable
 }
 
-var (
-	ErrDeleteSelf      = errors.New("cannot delete self")
-	ErrAlreadyDeleted  = errors.New("the object is already deleted")
-	ErrObjDoesNotExist = errors.New("the object does not exist")
-	ErrCantDeleteSpace = errors.New("not able to delete space")
-)
-
-var (
-	DoSnapshot       = objecttree.DoSnapshot
-	buildHistoryTree = func(objTree objecttree.ObjectTree) (objecttree.ReadableObjectTree, error) {
-		return objecttree.BuildHistoryTree(objecttree.HistoryTreeParams{
-			TreeStorage:   objTree.Storage(),
-			AclList:       objTree.AclList(),
-			BuildFullTree: true,
-		})
-	}
-)
-
-type BuildTreeFunc func(ctx context.Context, id string, listener updatelistener.UpdateListener) (t synctree.SyncTree, err error)
-
-type Deps struct {
-	BuildFunc     BuildTreeFunc
-	Account       accountservice.Service
-	TreeManager   treemanager.TreeManager
-	Store         spacestorage.SpaceStorage
-	Configuration nodeconf.NodeConf
-	DeletionState settingsstate.ObjectDeletionState
-	Provider      SpaceIdsProvider
-	OnSpaceDelete func()
-	// testing dependencies
-	builder       settingsstate.StateBuilder
-	del           Deleter
-	delManager    DeletionManager
-	changeFactory settingsstate.ChangeFactory
+func New() Settings {
+	return &settings{}
 }
 
-type settingsObject struct {
-	synctree.SyncTree
-	account     accountservice.Service
-	spaceId     string
-	treeManager treemanager.TreeManager
-	store       spacestorage.SpaceStorage
-	builder     settingsstate.StateBuilder
-	buildFunc   BuildTreeFunc
-	loop        *deleteLoop
+type settings struct {
+	account        accountservice.Service
+	treeManager    treemanager.TreeManager
+	storage        spacestorage.SpaceStorage
+	configuration  nodeconf.NodeConf
+	deletionState  deletionstate.ObjectDeletionState
+	headsync       headsync.HeadSync
+	treeBuilder    objecttreebuilder.TreeBuilderComponent
+	spaceIsDeleted *atomic.Bool
 
-	state           *settingsstate.State
-	deletionState   settingsstate.ObjectDeletionState
-	deletionManager DeletionManager
-	changeFactory   settingsstate.ChangeFactory
+	settingsObject SettingsObject
 }
 
-func NewSettingsObject(deps Deps, spaceId string) (obj SettingsObject) {
-	var (
-		deleter         Deleter
-		deletionManager DeletionManager
-		builder         settingsstate.StateBuilder
-		changeFactory   settingsstate.ChangeFactory
-	)
-	if deps.del == nil {
-		deleter = newDeleter(deps.Store, deps.DeletionState, deps.TreeManager)
-	} else {
-		deleter = deps.del
-	}
-	if deps.delManager == nil {
-		deletionManager = newDeletionManager(
-			spaceId,
-			deps.Store.SpaceSettingsId(),
-			deps.Configuration.IsResponsible(spaceId),
-			deps.TreeManager,
-			deps.DeletionState,
-			deps.Provider,
-			deps.OnSpaceDelete)
-	} else {
-		deletionManager = deps.delManager
-	}
-	if deps.builder == nil {
-		builder = settingsstate.NewStateBuilder()
-	} else {
-		builder = deps.builder
-	}
-	if deps.changeFactory == nil {
-		changeFactory = settingsstate.NewChangeFactory()
-	} else {
-		changeFactory = deps.changeFactory
-	}
+func (s *settings) Init(a *app.App) (err error) {
+	s.account = a.MustComponent(accountservice.CName).(accountservice.Service)
+	s.treeManager = app.MustComponent[treemanager.TreeManager](a)
+	s.headsync = a.MustComponent(headsync.CName).(headsync.HeadSync)
+	s.configuration = a.MustComponent(nodeconf.CName).(nodeconf.NodeConf)
+	s.deletionState = a.MustComponent(deletionstate.CName).(deletionstate.ObjectDeletionState)
+	s.treeBuilder = a.MustComponent(objecttreebuilder.CName).(objecttreebuilder.TreeBuilderComponent)
 
-	loop := newDeleteLoop(func() {
-		deleter.Delete()
-	})
-	deps.DeletionState.AddObserver(func(ids []string) {
-		loop.notify()
-	})
+	sharedState := a.MustComponent(spacestate.CName).(*spacestate.SpaceState)
+	s.storage = a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	s.spaceIsDeleted = sharedState.SpaceIsDeleted
 
-	s := &settingsObject{
-		loop:            loop,
-		spaceId:         spaceId,
-		account:         deps.Account,
-		deletionState:   deps.DeletionState,
-		treeManager:     deps.TreeManager,
-		store:           deps.Store,
-		buildFunc:       deps.BuildFunc,
-		builder:         builder,
-		deletionManager: deletionManager,
-		changeFactory:   changeFactory,
-	}
-	obj = s
-	return
-}
-
-func (s *settingsObject) updateIds(tr objecttree.ObjectTree) {
-	var err error
-	s.state, err = s.builder.Build(tr, s.state)
-	if err != nil {
-		log.Error("failed to build state", zap.Error(err))
-		return
-	}
-	log.Debug("updating object state", zap.String("deleted by", s.state.DeleterId))
-	if err = s.deletionManager.UpdateState(context.Background(), s.state); err != nil {
-		log.Error("failed to update state", zap.Error(err))
-	}
-}
-
-// Update is called as part of UpdateListener interface
-func (s *settingsObject) Update(tr objecttree.ObjectTree) {
-	s.updateIds(tr)
-}
-
-// Rebuild is called as part of UpdateListener interface (including when the object is built for the first time, e.g. on Init call)
-func (s *settingsObject) Rebuild(tr objecttree.ObjectTree) {
-	// at initial build "s" may not contain the object tree, so it is safer to provide it from the function parameter
-	s.state = nil
-	s.updateIds(tr)
-}
-
-func (s *settingsObject) Init(ctx context.Context) (err error) {
-	settingsId := s.store.SpaceSettingsId()
-	log.Debug("space settings id", zap.String("id", settingsId))
-	s.SyncTree, err = s.buildFunc(ctx, settingsId, s)
-	if err != nil {
-		return
-	}
-	// TODO: remove this check when everybody updates
-	if err = s.checkHistoryState(ctx); err != nil {
-		return
-	}
-	s.loop.Run()
-	return
-}
-
-func (s *settingsObject) checkHistoryState(ctx context.Context) (err error) {
-	historyTree, err := buildHistoryTree(s.SyncTree)
-	if err != nil {
-		return
-	}
-	fullState, err := s.builder.Build(historyTree, nil)
-	if err != nil {
-		return
-	}
-	if len(fullState.DeletedIds) != len(s.state.DeletedIds) {
-		log.WarnCtx(ctx, "state does not have all deleted ids",
-			zap.Int("fullstate ids", len(fullState.DeletedIds)),
-			zap.Int("state ids", len(fullState.DeletedIds)))
-		s.state = fullState
-		err = s.deletionManager.UpdateState(context.Background(), s.state)
-		if err != nil {
+	deps := Deps{
+		BuildFunc: func(ctx context.Context, id string, listener updatelistener.UpdateListener) (t synctree.SyncTree, err error) {
+			res, err := s.treeBuilder.BuildTree(ctx, id, objecttreebuilder.BuildTreeOpts{
+				Listener: listener,
+				// space settings document should not have empty data
+				TreeBuilder: objecttree.BuildObjectTree,
+			})
+			log.Debug("building settings tree", zap.String("id", id), zap.String("spaceId", sharedState.SpaceId))
+			if err != nil {
+				return
+			}
+			t = res.(synctree.SyncTree)
 			return
-		}
+		},
+		Account:       s.account,
+		TreeManager:   s.treeManager,
+		Store:         s.storage,
+		Configuration: s.configuration,
+		DeletionState: s.deletionState,
+		Provider:      s.headsync,
+		OnSpaceDelete: s.onSpaceDelete,
 	}
-	return
+	s.settingsObject = NewSettingsObject(deps, sharedState.SpaceId)
+	return nil
 }
 
-func (s *settingsObject) Close() error {
-	s.loop.Close()
-	return s.SyncTree.Close()
+func (s *settings) Name() (name string) {
+	return CName
 }
 
-func (s *settingsObject) DeleteSpace(ctx context.Context, raw *treechangeproto.RawTreeChangeWithId) (err error) {
-	s.Lock()
-	defer s.Unlock()
-	defer func() {
-		log.Debug("finished adding delete change", zap.Error(err))
-	}()
-	err = s.verifyDeleteSpace(raw)
-	if err != nil {
-		return
-	}
-	res, err := s.AddRawChanges(ctx, objecttree.RawChangesPayload{
-		NewHeads:   []string{raw.Id},
-		RawChanges: []*treechangeproto.RawTreeChangeWithId{raw},
-	})
-	if err != nil {
-		return
-	}
-	if !slices.Contains(res.Heads, raw.Id) {
-		err = ErrCantDeleteSpace
-		return
-	}
-	return
+func (s *settings) Run(ctx context.Context) (err error) {
+	return s.settingsObject.Init(ctx)
 }
 
-func (s *settingsObject) SpaceDeleteRawChange() (raw *treechangeproto.RawTreeChangeWithId, err error) {
-	accountData := s.account.Account()
-	data, err := s.changeFactory.CreateSpaceDeleteChange(accountData.PeerId, s.state, false)
-	if err != nil {
-		return
-	}
-	return s.PrepareChange(objecttree.SignableChangeContent{
-		Data:        data,
-		Key:         accountData.SignKey,
-		IsSnapshot:  false,
-		IsEncrypted: false,
-	})
+func (s *settings) Close(ctx context.Context) (err error) {
+	return s.settingsObject.Close()
 }
 
-func (s *settingsObject) DeleteObject(id string) (err error) {
-	s.Lock()
-	defer s.Unlock()
-	if s.Id() == id {
-		err = ErrDeleteSelf
-		return
-	}
-	if s.state.Exists(id) {
-		err = ErrAlreadyDeleted
-		return nil
-	}
-	_, err = s.store.TreeStorage(id)
-	if err != nil {
-		err = ErrObjDoesNotExist
-		return
-	}
-	isSnapshot := DoSnapshot(s.Len())
-	res, err := s.changeFactory.CreateObjectDeleteChange(id, s.state, isSnapshot)
-	if err != nil {
-		return
-	}
-
-	return s.addContent(res, isSnapshot)
+func (s *settings) DeleteTree(ctx context.Context, id string) (err error) {
+	return s.settingsObject.DeleteObject(id)
 }
 
-func (s *settingsObject) verifyDeleteSpace(raw *treechangeproto.RawTreeChangeWithId) (err error) {
-	data, err := s.UnpackChange(raw)
-	if err != nil {
-		return
-	}
-	return verifyDeleteContent(data, "")
+func (s *settings) SpaceDeleteRawChange(ctx context.Context) (raw *treechangeproto.RawTreeChangeWithId, err error) {
+	return s.settingsObject.SpaceDeleteRawChange()
 }
 
-func (s *settingsObject) addContent(data []byte, isSnapshot bool) (err error) {
-	accountData := s.account.Account()
-	res, err := s.AddContent(context.Background(), objecttree.SignableChangeContent{
-		Data:        data,
-		Key:         accountData.SignKey,
-		IsSnapshot:  isSnapshot,
-		IsEncrypted: false,
-	})
-	if err != nil {
-		return
-	}
-	if res.Mode == objecttree.Rebuild {
-		s.Rebuild(s)
-	} else {
-		s.Update(s)
-	}
-	return
+func (s *settings) DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error) {
+	return s.settingsObject.DeleteSpace(ctx, deleteChange)
 }
 
-func VerifyDeleteChange(raw *treechangeproto.RawTreeChangeWithId, identity crypto.PubKey, peerId string) (err error) {
-	changeBuilder := objecttree.NewChangeBuilder(crypto.NewKeyStorage(), nil)
-	res, err := changeBuilder.Unmarshall(raw, true)
+func (s *settings) onSpaceDelete() {
+	err := s.storage.SetSpaceDeleted()
 	if err != nil {
-		return
+		log.Warn("failed to set space deleted")
 	}
-	if !res.Identity.Equals(identity) {
-		return fmt.Errorf("incorrect identity")
-	}
-	return verifyDeleteContent(res.Data, peerId)
+	s.spaceIsDeleted.Swap(true)
 }
 
-func verifyDeleteContent(data []byte, peerId string) (err error) {
-	content := &spacesyncproto.SettingsData{}
-	err = proto.Unmarshal(data, content)
-	if err != nil {
-		return
-	}
-	if len(content.GetContent()) != 1 ||
-		content.GetContent()[0].GetSpaceDelete() == nil ||
-		(peerId == "" && content.GetContent()[0].GetSpaceDelete().GetDeleterPeerId() == "") ||
-		(peerId != "" && content.GetContent()[0].GetSpaceDelete().GetDeleterPeerId() != peerId) {
-		return fmt.Errorf("incorrect delete change payload")
-	}
-	return
+func (s *settings) SettingsObject() SettingsObject {
+	return s.settingsObject
 }

commonspace/settings/settingsobject.go

@@ -0,0 +1,329 @@
+//go:generate mockgen -destination mock_settings/mock_settings.go github.com/anyproto/any-sync/commonspace/settings DeletionManager,Deleter,SpaceIdsProvider
+package settings
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
+	"github.com/anyproto/any-sync/util/crypto"
+
+	"github.com/anyproto/any-sync/accountservice"
+	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree"
+	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
+	"github.com/anyproto/any-sync/commonspace/object/treemanager"
+	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
+	"github.com/anyproto/any-sync/commonspace/spacestorage"
+	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/nodeconf"
+	"github.com/gogo/protobuf/proto"
+	"go.uber.org/zap"
+	"golang.org/x/exp/slices"
+)
+
+var log = logger.NewNamed("common.commonspace.settings")
+
+type SettingsObject interface {
+	synctree.SyncTree
+	Init(ctx context.Context) (err error)
+	DeleteObject(id string) (err error)
+	DeleteSpace(ctx context.Context, raw *treechangeproto.RawTreeChangeWithId) (err error)
+	SpaceDeleteRawChange() (raw *treechangeproto.RawTreeChangeWithId, err error)
+}
+
+var (
+	ErrDeleteSelf      = errors.New("cannot delete self")
+	ErrAlreadyDeleted  = errors.New("the object is already deleted")
+	ErrObjDoesNotExist = errors.New("the object does not exist")
+	ErrCantDeleteSpace = errors.New("not able to delete space")
+)
+
+var (
+	DoSnapshot       = objecttree.DoSnapshot
+	buildHistoryTree = func(objTree objecttree.ObjectTree) (objecttree.ReadableObjectTree, error) {
+		return objecttree.BuildHistoryTree(objecttree.HistoryTreeParams{
+			TreeStorage:   objTree.Storage(),
+			AclList:       objTree.AclList(),
+			BuildFullTree: true,
+		})
+	}
+)
+
+type BuildTreeFunc func(ctx context.Context, id string, listener updatelistener.UpdateListener) (t synctree.SyncTree, err error)
+
+type Deps struct {
+	BuildFunc     BuildTreeFunc
+	Account       accountservice.Service
+	TreeManager   treemanager.TreeManager
+	Store         spacestorage.SpaceStorage
+	Configuration nodeconf.NodeConf
+	DeletionState deletionstate.ObjectDeletionState
+	Provider      SpaceIdsProvider
+	OnSpaceDelete func()
+	// testing dependencies
+	builder       settingsstate.StateBuilder
+	del           Deleter
+	delManager    DeletionManager
+	changeFactory settingsstate.ChangeFactory
+}
+
+type settingsObject struct {
+	synctree.SyncTree
+	account     accountservice.Service
+	spaceId     string
+	treeManager treemanager.TreeManager
+	store       spacestorage.SpaceStorage
+	builder     settingsstate.StateBuilder
+	buildFunc   BuildTreeFunc
+	loop        *deleteLoop
+
+	state           *settingsstate.State
+	deletionState   deletionstate.ObjectDeletionState
+	deletionManager DeletionManager
+	changeFactory   settingsstate.ChangeFactory
+}
+
+func NewSettingsObject(deps Deps, spaceId string) (obj SettingsObject) {
+	var (
+		deleter         Deleter
+		deletionManager DeletionManager
+		builder         settingsstate.StateBuilder
+		changeFactory   settingsstate.ChangeFactory
+	)
+	if deps.del == nil {
+		deleter = newDeleter(deps.Store, deps.DeletionState, deps.TreeManager)
+	} else {
+		deleter = deps.del
+	}
+	if deps.delManager == nil {
+		deletionManager = newDeletionManager(
+			spaceId,
+			deps.Store.SpaceSettingsId(),
+			deps.Configuration.IsResponsible(spaceId),
+			deps.TreeManager,
+			deps.DeletionState,
+			deps.Provider,
+			deps.OnSpaceDelete)
+	} else {
+		deletionManager = deps.delManager
+	}
+	if deps.builder == nil {
+		builder = settingsstate.NewStateBuilder()
+	} else {
+		builder = deps.builder
+	}
+	if deps.changeFactory == nil {
+		changeFactory = settingsstate.NewChangeFactory()
+	} else {
+		changeFactory = deps.changeFactory
+	}
+
+	loop := newDeleteLoop(func() {
+		deleter.Delete()
+	})
+	deps.DeletionState.AddObserver(func(ids []string) {
+		loop.notify()
+	})
+
+	s := &settingsObject{
+		loop:            loop,
+		spaceId:         spaceId,
+		account:         deps.Account,
+		deletionState:   deps.DeletionState,
+		treeManager:     deps.TreeManager,
+		store:           deps.Store,
+		buildFunc:       deps.BuildFunc,
+		builder:         builder,
+		deletionManager: deletionManager,
+		changeFactory:   changeFactory,
+	}
+	obj = s
+	return
+}
+
+func (s *settingsObject) updateIds(tr objecttree.ObjectTree) {
+	var err error
+	s.state, err = s.builder.Build(tr, s.state)
+	if err != nil {
+		log.Error("failed to build state", zap.Error(err))
+		return
+	}
+	log.Debug("updating object state", zap.String("deleted by", s.state.DeleterId))
+	if err = s.deletionManager.UpdateState(context.Background(), s.state); err != nil {
+		log.Error("failed to update state", zap.Error(err))
+	}
+}
+
+// Update is called as part of UpdateListener interface
+func (s *settingsObject) Update(tr objecttree.ObjectTree) {
+	s.updateIds(tr)
+}
+
+// Rebuild is called as part of UpdateListener interface (including when the object is built for the first time, e.g. on Init call)
+func (s *settingsObject) Rebuild(tr objecttree.ObjectTree) {
+	// at initial build "s" may not contain the object tree, so it is safer to provide it from the function parameter
+	s.state = nil
+	s.updateIds(tr)
+}
+
+func (s *settingsObject) Init(ctx context.Context) (err error) {
+	settingsId := s.store.SpaceSettingsId()
+	log.Debug("space settings id", zap.String("id", settingsId))
+	s.SyncTree, err = s.buildFunc(ctx, settingsId, s)
+	if err != nil {
+		return
+	}
+	// TODO: remove this check when everybody updates
+	if err = s.checkHistoryState(ctx); err != nil {
+		return
+	}
+	s.loop.Run()
+	return
+}
+
+func (s *settingsObject) checkHistoryState(ctx context.Context) (err error) {
+	historyTree, err := buildHistoryTree(s.SyncTree)
+	if err != nil {
+		return
+	}
+	fullState, err := s.builder.Build(historyTree, nil)
+	if err != nil {
+		return
+	}
+	if len(fullState.DeletedIds) != len(s.state.DeletedIds) {
+		log.WarnCtx(ctx, "state does not have all deleted ids",
+			zap.Int("fullstate ids", len(fullState.DeletedIds)),
+			zap.Int("state ids", len(fullState.DeletedIds)))
+		s.state = fullState
+		err = s.deletionManager.UpdateState(context.Background(), s.state)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+func (s *settingsObject) Close() error {
+	s.loop.Close()
+	return s.SyncTree.Close()
+}
+
+func (s *settingsObject) DeleteSpace(ctx context.Context, raw *treechangeproto.RawTreeChangeWithId) (err error) {
+	s.Lock()
+	defer s.Unlock()
+	defer func() {
+		log.Debug("finished adding delete change", zap.Error(err))
+	}()
+	err = s.verifyDeleteSpace(raw)
+	if err != nil {
+		return
+	}
+	res, err := s.AddRawChanges(ctx, objecttree.RawChangesPayload{
+		NewHeads:   []string{raw.Id},
+		RawChanges: []*treechangeproto.RawTreeChangeWithId{raw},
+	})
+	if err != nil {
+		return
+	}
+	if !slices.Contains(res.Heads, raw.Id) {
+		err = ErrCantDeleteSpace
+		return
+	}
+	return
+}
+
+func (s *settingsObject) SpaceDeleteRawChange() (raw *treechangeproto.RawTreeChangeWithId, err error) {
+	accountData := s.account.Account()
+	data, err := s.changeFactory.CreateSpaceDeleteChange(accountData.PeerId, s.state, false)
+	if err != nil {
+		return
+	}
+	return s.PrepareChange(objecttree.SignableChangeContent{
+		Data:        data,
+		Key:         accountData.SignKey,
+		IsSnapshot:  false,
+		IsEncrypted: false,
+	})
+}
+
+func (s *settingsObject) DeleteObject(id string) (err error) {
+	s.Lock()
+	defer s.Unlock()
+	if s.Id() == id {
+		err = ErrDeleteSelf
+		return
+	}
+	if s.state.Exists(id) {
+		err = ErrAlreadyDeleted
+		return nil
+	}
+	_, err = s.store.TreeStorage(id)
+	if err != nil {
+		err = ErrObjDoesNotExist
+		return
+	}
+	isSnapshot := DoSnapshot(s.Len())
+	res, err := s.changeFactory.CreateObjectDeleteChange(id, s.state, isSnapshot)
+	if err != nil {
+		return
+	}
+
+	return s.addContent(res, isSnapshot)
+}
+
+func (s *settingsObject) verifyDeleteSpace(raw *treechangeproto.RawTreeChangeWithId) (err error) {
+	data, err := s.UnpackChange(raw)
+	if err != nil {
+		return
+	}
+	return verifyDeleteContent(data, "")
+}
+
+func (s *settingsObject) addContent(data []byte, isSnapshot bool) (err error) {
+	accountData := s.account.Account()
+	res, err := s.AddContent(context.Background(), objecttree.SignableChangeContent{
+		Data:        data,
+		Key:         accountData.SignKey,
+		IsSnapshot:  isSnapshot,
+		IsEncrypted: false,
+	})
+	if err != nil {
+		return
+	}
+	if res.Mode == objecttree.Rebuild {
+		s.Rebuild(s)
+	} else {
+		s.Update(s)
+	}
+	return
+}
+
+func VerifyDeleteChange(raw *treechangeproto.RawTreeChangeWithId, identity crypto.PubKey, peerId string) (err error) {
+	changeBuilder := objecttree.NewChangeBuilder(crypto.NewKeyStorage(), nil)
+	res, err := changeBuilder.Unmarshall(raw, true)
+	if err != nil {
+		return
+	}
+	if !res.Identity.Equals(identity) {
+		return fmt.Errorf("incorrect identity")
+	}
+	return verifyDeleteContent(res.Data, peerId)
+}
+
+func verifyDeleteContent(data []byte, peerId string) (err error) {
+	content := &spacesyncproto.SettingsData{}
+	err = proto.Unmarshal(data, content)
+	if err != nil {
+		return
+	}
+	if len(content.GetContent()) != 1 ||
+		content.GetContent()[0].GetSpaceDelete() == nil ||
+		(peerId == "" && content.GetContent()[0].GetSpaceDelete().GetDeleterPeerId() == "") ||
+		(peerId != "" && content.GetContent()[0].GetSpaceDelete().GetDeleterPeerId() != peerId) {
+		return fmt.Errorf("incorrect delete change payload")
+	}
+	return
+}

commonspace/settings/settingsobject_test.go

@@ -3,6 +3,7 @@ package settings
 import (
 	"context"
 	"github.com/anyproto/any-sync/accountservice/mock_accountservice"
+	"github.com/anyproto/any-sync/commonspace/deletionstate/mock_deletionstate"
 	"github.com/anyproto/any-sync/commonspace/object/accountdata"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree/mock_objecttree"
@@ -15,8 +16,8 @@ import (
 	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
 	"github.com/anyproto/any-sync/commonspace/settings/settingsstate/mock_settingsstate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage/mock_spacestorage"
-	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
 	"sync"
 	"testing"
 	"time"
@@ -54,7 +55,7 @@ type settingsFixture struct {
 	deleter         *mock_settings.MockDeleter
 	syncTree        *mock_synctree.MockSyncTree
 	historyTree     *mock_objecttree.MockObjectTree
-	delState        *mock_settingsstate.MockObjectDeletionState
+	delState        *mock_deletionstate.MockObjectDeletionState
 	account         *mock_accountservice.MockService
 }
 
@@ -66,7 +67,7 @@ func newSettingsFixture(t *testing.T) *settingsFixture {
 	acc := mock_accountservice.NewMockService(ctrl)
 	treeManager := mock_treemanager.NewMockTreeManager(ctrl)
 	st := mock_spacestorage.NewMockSpaceStorage(ctrl)
-	delState := mock_settingsstate.NewMockObjectDeletionState(ctrl)
+	delState := mock_deletionstate.NewMockObjectDeletionState(ctrl)
 	delManager := mock_settings.NewMockDeletionManager(ctrl)
 	stateBuilder := mock_settingsstate.NewMockStateBuilder(ctrl)
 	changeFactory := mock_settingsstate.NewMockChangeFactory(ctrl)

commonspace/settings/settingsstate/mock_settingsstate/mock_settingsstate.go

@@ -1,5 +1,5 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/anyproto/any-sync/commonspace/settings/settingsstate (interfaces: ObjectDeletionState,StateBuilder,ChangeFactory)
+// Source: github.com/anyproto/any-sync/commonspace/settings/settingsstate (interfaces: StateBuilder,ChangeFactory)
 
 // Package mock_settingsstate is a generated GoMock package.
 package mock_settingsstate
@@ -9,112 +9,9 @@ import (
 
 	objecttree "github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	settingsstate "github.com/anyproto/any-sync/commonspace/settings/settingsstate"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
-// MockObjectDeletionState is a mock of ObjectDeletionState interface.
-type MockObjectDeletionState struct {
-	ctrl     *gomock.Controller
-	recorder *MockObjectDeletionStateMockRecorder
-}
-
-// MockObjectDeletionStateMockRecorder is the mock recorder for MockObjectDeletionState.
-type MockObjectDeletionStateMockRecorder struct {
-	mock *MockObjectDeletionState
-}
-
-// NewMockObjectDeletionState creates a new mock instance.
-func NewMockObjectDeletionState(ctrl *gomock.Controller) *MockObjectDeletionState {
-	mock := &MockObjectDeletionState{ctrl: ctrl}
-	mock.recorder = &MockObjectDeletionStateMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use.
-func (m *MockObjectDeletionState) EXPECT() *MockObjectDeletionStateMockRecorder {
-	return m.recorder
-}
-
-// Add mocks base method.
-func (m *MockObjectDeletionState) Add(arg0 map[string]struct{}) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Add", arg0)
-}
-
-// Add indicates an expected call of Add.
-func (mr *MockObjectDeletionStateMockRecorder) Add(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Add", reflect.TypeOf((*MockObjectDeletionState)(nil).Add), arg0)
-}
-
-// AddObserver mocks base method.
-func (m *MockObjectDeletionState) AddObserver(arg0 settingsstate.StateUpdateObserver) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "AddObserver", arg0)
-}
-
-// AddObserver indicates an expected call of AddObserver.
-func (mr *MockObjectDeletionStateMockRecorder) AddObserver(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddObserver", reflect.TypeOf((*MockObjectDeletionState)(nil).AddObserver), arg0)
-}
-
-// Delete mocks base method.
-func (m *MockObjectDeletionState) Delete(arg0 string) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Delete", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// Delete indicates an expected call of Delete.
-func (mr *MockObjectDeletionStateMockRecorder) Delete(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockObjectDeletionState)(nil).Delete), arg0)
-}
-
-// Exists mocks base method.
-func (m *MockObjectDeletionState) Exists(arg0 string) bool {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Exists", arg0)
-	ret0, _ := ret[0].(bool)
-	return ret0
-}
-
-// Exists indicates an expected call of Exists.
-func (mr *MockObjectDeletionStateMockRecorder) Exists(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exists", reflect.TypeOf((*MockObjectDeletionState)(nil).Exists), arg0)
-}
-
-// Filter mocks base method.
-func (m *MockObjectDeletionState) Filter(arg0 []string) []string {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Filter", arg0)
-	ret0, _ := ret[0].([]string)
-	return ret0
-}
-
-// Filter indicates an expected call of Filter.
-func (mr *MockObjectDeletionStateMockRecorder) Filter(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Filter", reflect.TypeOf((*MockObjectDeletionState)(nil).Filter), arg0)
-}
-
-// GetQueued mocks base method.
-func (m *MockObjectDeletionState) GetQueued() []string {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetQueued")
-	ret0, _ := ret[0].([]string)
-	return ret0
-}
-
-// GetQueued indicates an expected call of GetQueued.
-func (mr *MockObjectDeletionStateMockRecorder) GetQueued() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetQueued", reflect.TypeOf((*MockObjectDeletionState)(nil).GetQueued))
-}
-
 // MockStateBuilder is a mock of StateBuilder interface.
 type MockStateBuilder struct {
 	ctrl     *gomock.Controller

commonspace/settings/settingsstate/settingsstate.go

@@ -1,3 +1,4 @@
+//go:generate mockgen -destination mock_settingsstate/mock_settingsstate.go github.com/anyproto/any-sync/commonspace/settings/settingsstate StateBuilder,ChangeFactory
 package settingsstate
 
 import "github.com/anyproto/any-sync/commonspace/spacesyncproto"

commonspace/settings/settingsstate/statebuilder_test.go

@@ -4,8 +4,8 @@ import (
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree/mock_objecttree"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/mock/gomock"
 	"testing"
 )
 

commonspace/space.go

@@ -2,44 +2,28 @@ package commonspace
 
 import (
 	"context"
-	"errors"
-	"github.com/anyproto/any-sync/accountservice"
-	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/commonspace/headsync"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
-	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
-	"github.com/anyproto/any-sync/commonspace/object/tree/synctree"
-	"github.com/anyproto/any-sync/commonspace/object/tree/synctree/updatelistener"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
-	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/commonspace/objectsync"
+	"github.com/anyproto/any-sync/commonspace/objecttreebuilder"
 	"github.com/anyproto/any-sync/commonspace/peermanager"
 	"github.com/anyproto/any-sync/commonspace/settings"
-	"github.com/anyproto/any-sync/commonspace/settings/settingsstate"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
-	"github.com/anyproto/any-sync/metric"
 	"github.com/anyproto/any-sync/net/peer"
-	"github.com/anyproto/any-sync/nodeconf"
 	"github.com/anyproto/any-sync/util/crypto"
-	"github.com/anyproto/any-sync/util/multiqueue"
-	"github.com/anyproto/any-sync/util/slice"
-	"github.com/cheggaaa/mb/v3"
-	"github.com/zeebo/errs"
 	"go.uber.org/zap"
 	"strconv"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 )
 
-var (
-	ErrSpaceClosed = errors.New("space is closed")
-)
-
 type SpaceCreatePayload struct {
 	// SigningKey is the signing key of the owner
 	SigningKey crypto.PrivKey
@@ -55,25 +39,6 @@ type SpaceCreatePayload struct {
 	MasterKey crypto.PrivKey
 }
 
-type HandleMessage struct {
-	Id                uint64
-	ReceiveTime       time.Time
-	StartHandlingTime time.Time
-	Deadline          time.Time
-	SenderId          string
-	Message           *spacesyncproto.ObjectSyncMessage
-	PeerCtx           context.Context
-}
-
-func (m HandleMessage) LogFields(fields ...zap.Field) []zap.Field {
-	return append(fields,
-		metric.SpaceId(m.Message.SpaceId),
-		metric.ObjectId(m.Message.ObjectId),
-		metric.QueueDur(m.StartHandlingTime.Sub(m.ReceiveTime)),
-		metric.TotalDur(time.Since(m.ReceiveTime)),
-	)
-}
-
 type SpaceDerivePayload struct {
 	SigningKey   crypto.PrivKey
 	MasterKey    crypto.PrivKey
@@ -96,58 +61,45 @@ func NewSpaceId(id string, repKey uint64) string {
 type Space interface {
 	Id() string
 	Init(ctx context.Context) error
+	Acl() list.AclList
 
 	StoredIds() []string
 	DebugAllHeads() []headsync.TreeHeads
-	Description() (SpaceDescription, error)
+	Description() (desc SpaceDescription, err error)
 
-	CreateTree(ctx context.Context, payload objecttree.ObjectTreeCreatePayload) (res treestorage.TreeStorageCreatePayload, err error)
-	PutTree(ctx context.Context, payload treestorage.TreeStorageCreatePayload, listener updatelistener.UpdateListener) (t objecttree.ObjectTree, err error)
-	BuildTree(ctx context.Context, id string, opts BuildTreeOpts) (t objecttree.ObjectTree, err error)
-	DeleteTree(ctx context.Context, id string) (err error)
-	BuildHistoryTree(ctx context.Context, id string, opts HistoryTreeOpts) (t objecttree.HistoryTree, err error)
-
-	SpaceDeleteRawChange(ctx context.Context) (raw *treechangeproto.RawTreeChangeWithId, err error)
-	DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error)
-
-	HeadSync() headsync.HeadSync
-	ObjectSync() objectsync.ObjectSync
+	TreeBuilder() objecttreebuilder.TreeBuilder
 	SyncStatus() syncstatus.StatusUpdater
 	Storage() spacestorage.SpaceStorage
 
-	HandleMessage(ctx context.Context, msg HandleMessage) (err error)
+	DeleteTree(ctx context.Context, id string) (err error)
+	SpaceDeleteRawChange(ctx context.Context) (raw *treechangeproto.RawTreeChangeWithId, err error)
+	DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error)
+
+	GetNodePeers(ctx context.Context) (peer []peer.Peer, err error)
+
+	HandleMessage(ctx context.Context, msg objectsync.HandleMessage) (err error)
+	HandleSyncRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error)
+	HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error)
 
 	TryClose(objectTTL time.Duration) (close bool, err error)
 	Close() error
 }
 
 type space struct {
-	id     string
 	mu     sync.RWMutex
 	header *spacesyncproto.RawSpaceHeaderWithId
 
-	objectSync     objectsync.ObjectSync
-	headSync       headsync.HeadSync
-	syncStatus     syncstatus.StatusUpdater
-	storage        spacestorage.SpaceStorage
-	treeManager    *commonGetter
-	account        accountservice.Service
-	aclList        *syncacl.SyncAcl
-	configuration  nodeconf.NodeConf
-	settingsObject settings.SettingsObject
-	peerManager    peermanager.PeerManager
-	treeBuilder    objecttree.BuildObjectTreeFunc
-	metric         metric.Metric
+	state *spacestate.SpaceState
+	app   *app.App
 
-	handleQueue multiqueue.MultiQueue[HandleMessage]
-
-	isClosed  *atomic.Bool
-	isDeleted *atomic.Bool
-	treesUsed *atomic.Int32
-}
-
-func (s *space) Id() string {
-	return s.id
+	treeBuilder objecttreebuilder.TreeBuilderComponent
+	peerManager peermanager.PeerManager
+	headSync    headsync.HeadSync
+	objectSync  objectsync.ObjectSync
+	syncStatus  syncstatus.StatusService
+	settings    settings.Settings
+	storage     spacestorage.SpaceStorage
+	aclList     list.AclList
 }
 
 func (s *space) Description() (desc SpaceDescription, err error) {
@@ -171,72 +123,69 @@ func (s *space) Description() (desc SpaceDescription, err error) {
 	return
 }
 
+func (s *space) StoredIds() []string {
+	return s.headSync.ExternalIds()
+}
+
+func (s *space) DebugAllHeads() []headsync.TreeHeads {
+	return s.headSync.DebugAllHeads()
+}
+
+func (s *space) DeleteTree(ctx context.Context, id string) (err error) {
+	return s.settings.DeleteTree(ctx, id)
+}
+
+func (s *space) SpaceDeleteRawChange(ctx context.Context) (raw *treechangeproto.RawTreeChangeWithId, err error) {
+	return s.settings.SpaceDeleteRawChange(ctx)
+}
+
+func (s *space) DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error) {
+	return s.settings.DeleteSpace(ctx, deleteChange)
+}
+
+func (s *space) HandleMessage(ctx context.Context, msg objectsync.HandleMessage) (err error) {
+	return s.objectSync.HandleMessage(ctx, msg)
+}
+
+func (s *space) HandleSyncRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
+	return s.objectSync.HandleRequest(ctx, req)
+}
+
+func (s *space) HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error) {
+	return s.headSync.HandleRangeRequest(ctx, req)
+}
+
+func (s *space) TreeBuilder() objecttreebuilder.TreeBuilder {
+	return s.treeBuilder
+}
+
+func (s *space) GetNodePeers(ctx context.Context) (peer []peer.Peer, err error) {
+	return s.peerManager.GetNodePeers(ctx)
+}
+
+func (s *space) Acl() list.AclList {
+	return s.aclList
+}
+
+func (s *space) Id() string {
+	return s.state.SpaceId
+}
+
 func (s *space) Init(ctx context.Context) (err error) {
-	log.With(zap.String("spaceId", s.id)).Debug("initializing space")
-	s.storage = newCommonStorage(s.storage)
-
-	header, err := s.storage.SpaceHeader()
+	err = s.app.Start(ctx)
 	if err != nil {
 		return
 	}
-	s.header = header
-	initialIds, err := s.storage.StoredIds()
-	if err != nil {
-		return
-	}
-	aclStorage, err := s.storage.AclStorage()
-	if err != nil {
-		return
-	}
-	aclList, err := list.BuildAclListWithIdentity(s.account.Account(), aclStorage)
-	if err != nil {
-		return
-	}
-	s.aclList = syncacl.NewSyncAcl(aclList, s.objectSync.SyncClient().MessagePool())
-	s.treeManager.AddObject(s.aclList)
-
-	deletionState := settingsstate.NewObjectDeletionState(log, s.storage)
-	deps := settings.Deps{
-		BuildFunc: func(ctx context.Context, id string, listener updatelistener.UpdateListener) (t synctree.SyncTree, err error) {
-			res, err := s.BuildTree(ctx, id, BuildTreeOpts{
-				Listener:           listener,
-				WaitTreeRemoteSync: false,
-				// space settings document should not have empty data
-				treeBuilder: objecttree.BuildObjectTree,
-			})
-			log.Debug("building settings tree", zap.String("id", id), zap.String("spaceId", s.id))
-			if err != nil {
-				return
-			}
-			t = res.(synctree.SyncTree)
-			return
-		},
-		Account:       s.account,
-		TreeManager:   s.treeManager,
-		Store:         s.storage,
-		DeletionState: deletionState,
-		Provider:      s.headSync,
-		Configuration: s.configuration,
-		OnSpaceDelete: s.onSpaceDelete,
-	}
-	s.settingsObject = settings.NewSettingsObject(deps, s.id)
-	s.headSync.Init(initialIds, deletionState)
-	err = s.settingsObject.Init(ctx)
-	if err != nil {
-		return
-	}
-	s.treeManager.AddObject(s.settingsObject)
-	s.syncStatus.Run()
-	s.handleQueue = multiqueue.New[HandleMessage](s.handleMessage, 100)
-	return nil
-}
-
-func (s *space) ObjectSync() objectsync.ObjectSync {
-	return s.objectSync
-}
-
-func (s *space) HeadSync() headsync.HeadSync {
-	return s.headSync
+	s.treeBuilder = s.app.MustComponent(objecttreebuilder.CName).(objecttreebuilder.TreeBuilderComponent)
+	s.headSync = s.app.MustComponent(headsync.CName).(headsync.HeadSync)
+	s.syncStatus = s.app.MustComponent(syncstatus.CName).(syncstatus.StatusService)
+	s.settings = s.app.MustComponent(settings.CName).(settings.Settings)
+	s.objectSync = s.app.MustComponent(objectsync.CName).(objectsync.ObjectSync)
+	s.storage = s.app.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	s.peerManager = s.app.MustComponent(peermanager.CName).(peermanager.PeerManager)
+	s.aclList = s.app.MustComponent(syncacl.CName).(list.AclList)
+	s.header, err = s.storage.SpaceHeader()
+	return
 }
 
 func (s *space) SyncStatus() syncstatus.StatusUpdater {
@@ -247,246 +196,25 @@ func (s *space) Storage() spacestorage.SpaceStorage {
 	return s.storage
 }
 
-func (s *space) StoredIds() []string {
-	return slice.DiscardFromSlice(s.headSync.AllIds(), func(id string) bool {
-		return id == s.settingsObject.Id()
-	})
-}
-
-func (s *space) DebugAllHeads() []headsync.TreeHeads {
-	return s.headSync.DebugAllHeads()
-}
-
-func (s *space) CreateTree(ctx context.Context, payload objecttree.ObjectTreeCreatePayload) (res treestorage.TreeStorageCreatePayload, err error) {
-	if s.isClosed.Load() {
-		err = ErrSpaceClosed
-		return
-	}
-	root, err := objecttree.CreateObjectTreeRoot(payload, s.aclList)
-	if err != nil {
-		return
-	}
-
-	res = treestorage.TreeStorageCreatePayload{
-		RootRawChange: root,
-		Changes:       []*treechangeproto.RawTreeChangeWithId{root},
-		Heads:         []string{root.Id},
-	}
-	return
-}
-
-func (s *space) PutTree(ctx context.Context, payload treestorage.TreeStorageCreatePayload, listener updatelistener.UpdateListener) (t objecttree.ObjectTree, err error) {
-	if s.isClosed.Load() {
-		err = ErrSpaceClosed
-		return
-	}
-	deps := synctree.BuildDeps{
-		SpaceId:         s.id,
-		SyncClient:      s.objectSync.SyncClient(),
-		Configuration:   s.configuration,
-		HeadNotifiable:  s.headSync,
-		Listener:        listener,
-		AclList:         s.aclList,
-		SpaceStorage:    s.storage,
-		OnClose:         s.onObjectClose,
-		SyncStatus:      s.syncStatus,
-		PeerGetter:      s.peerManager,
-		BuildObjectTree: s.treeBuilder,
-	}
-	t, err = synctree.PutSyncTree(ctx, payload, deps)
-	if err != nil {
-		return
-	}
-	s.treesUsed.Add(1)
-	log.Debug("incrementing counter", zap.String("id", payload.RootRawChange.Id), zap.Int32("trees", s.treesUsed.Load()), zap.String("spaceId", s.id))
-	return
-}
-
-type BuildTreeOpts struct {
-	Listener           updatelistener.UpdateListener
-	WaitTreeRemoteSync bool
-	treeBuilder        objecttree.BuildObjectTreeFunc
-}
-
-type HistoryTreeOpts struct {
-	BeforeId      string
-	Include       bool
-	BuildFullTree bool
-}
-
-func (s *space) BuildTree(ctx context.Context, id string, opts BuildTreeOpts) (t objecttree.ObjectTree, err error) {
-	if s.isClosed.Load() {
-		err = ErrSpaceClosed
-		return
-	}
-	treeBuilder := opts.treeBuilder
-	if treeBuilder == nil {
-		treeBuilder = s.treeBuilder
-	}
-	deps := synctree.BuildDeps{
-		SpaceId:            s.id,
-		SyncClient:         s.objectSync.SyncClient(),
-		Configuration:      s.configuration,
-		HeadNotifiable:     s.headSync,
-		Listener:           opts.Listener,
-		AclList:            s.aclList,
-		SpaceStorage:       s.storage,
-		OnClose:            s.onObjectClose,
-		SyncStatus:         s.syncStatus,
-		WaitTreeRemoteSync: opts.WaitTreeRemoteSync,
-		PeerGetter:         s.peerManager,
-		BuildObjectTree:    treeBuilder,
-	}
-	s.treesUsed.Add(1)
-	log.Debug("incrementing counter", zap.String("id", id), zap.Int32("trees", s.treesUsed.Load()), zap.String("spaceId", s.id))
-	if t, err = synctree.BuildSyncTreeOrGetRemote(ctx, id, deps); err != nil {
-		s.treesUsed.Add(-1)
-		log.Debug("decrementing counter, load failed", zap.String("id", id), zap.Int32("trees", s.treesUsed.Load()), zap.String("spaceId", s.id), zap.Error(err))
-		return nil, err
-	}
-	return
-}
-
-func (s *space) BuildHistoryTree(ctx context.Context, id string, opts HistoryTreeOpts) (t objecttree.HistoryTree, err error) {
-	if s.isClosed.Load() {
-		err = ErrSpaceClosed
-		return
-	}
-
-	params := objecttree.HistoryTreeParams{
-		AclList:         s.aclList,
-		BeforeId:        opts.BeforeId,
-		IncludeBeforeId: opts.Include,
-		BuildFullTree:   opts.BuildFullTree,
-	}
-	params.TreeStorage, err = s.storage.TreeStorage(id)
-	if err != nil {
-		return
-	}
-	return objecttree.BuildHistoryTree(params)
-}
-
-func (s *space) DeleteTree(ctx context.Context, id string) (err error) {
-	return s.settingsObject.DeleteObject(id)
-}
-
-func (s *space) SpaceDeleteRawChange(ctx context.Context) (raw *treechangeproto.RawTreeChangeWithId, err error) {
-	return s.settingsObject.SpaceDeleteRawChange()
-}
-
-func (s *space) DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error) {
-	return s.settingsObject.DeleteSpace(ctx, deleteChange)
-}
-
-func (s *space) HandleMessage(ctx context.Context, hm HandleMessage) (err error) {
-	threadId := hm.Message.ObjectId
-	hm.ReceiveTime = time.Now()
-	if hm.Message.ReplyId != "" {
-		threadId += hm.Message.ReplyId
-		defer func() {
-			_ = s.handleQueue.CloseThread(threadId)
-		}()
-	}
-	if hm.PeerCtx == nil {
-		hm.PeerCtx = ctx
-	}
-	err = s.handleQueue.Add(ctx, threadId, hm)
-	if err == mb.ErrOverflowed {
-		log.InfoCtx(ctx, "queue overflowed", zap.String("spaceId", s.id), zap.String("objectId", threadId))
-		// skip overflowed error
-		return nil
-	}
-	return
-}
-
-func (s *space) handleMessage(msg HandleMessage) {
-	var err error
-	msg.StartHandlingTime = time.Now()
-	ctx := peer.CtxWithPeerId(context.Background(), msg.SenderId)
-	ctx = logger.CtxWithFields(ctx, zap.Uint64("msgId", msg.Id), zap.String("senderId", msg.SenderId))
-	defer func() {
-		if s.metric == nil {
-			return
-		}
-		s.metric.RequestLog(msg.PeerCtx, "space.streamOp", msg.LogFields(
-			zap.Error(err),
-		)...)
-	}()
-
-	if !msg.Deadline.IsZero() {
-		now := time.Now()
-		if now.After(msg.Deadline) {
-			log.InfoCtx(ctx, "skip message: deadline exceed")
-			err = context.DeadlineExceeded
-			return
-		}
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithDeadline(ctx, msg.Deadline)
-		defer cancel()
-	}
-
-	if err = s.objectSync.HandleMessage(ctx, msg.SenderId, msg.Message); err != nil {
-		if msg.Message.ObjectId != "" {
-			// cleanup thread on error
-			_ = s.handleQueue.CloseThread(msg.Message.ObjectId)
-		}
-		log.InfoCtx(ctx, "handleMessage error", zap.Error(err))
-	}
-}
-
-func (s *space) onObjectClose(id string) {
-	s.treesUsed.Add(-1)
-	log.Debug("decrementing counter", zap.String("id", id), zap.Int32("trees", s.treesUsed.Load()), zap.String("spaceId", s.id))
-	_ = s.handleQueue.CloseThread(id)
-}
-
-func (s *space) onSpaceDelete() {
-	err := s.storage.SetSpaceDeleted()
-	if err != nil {
-		log.Debug("failed to set space deleted")
-	}
-	s.isDeleted.Swap(true)
-}
-
 func (s *space) Close() error {
-	if s.isClosed.Swap(true) {
-		log.Warn("call space.Close on closed space", zap.String("id", s.id))
+	if s.state.SpaceIsClosed.Swap(true) {
+		log.Warn("call space.Close on closed space", zap.String("id", s.state.SpaceId))
 		return nil
 	}
-	log.With(zap.String("id", s.id)).Debug("space is closing")
+	log := log.With(zap.String("spaceId", s.state.SpaceId))
+	log.Debug("space is closing")
 
-	var mError errs.Group
-	if err := s.handleQueue.Close(); err != nil {
-		mError.Add(err)
-	}
-	if err := s.headSync.Close(); err != nil {
-		mError.Add(err)
-	}
-	if err := s.objectSync.Close(); err != nil {
-		mError.Add(err)
-	}
-	if err := s.settingsObject.Close(); err != nil {
-		mError.Add(err)
-	}
-	if err := s.aclList.Close(); err != nil {
-		mError.Add(err)
-	}
-	if err := s.storage.Close(); err != nil {
-		mError.Add(err)
-	}
-	if err := s.syncStatus.Close(); err != nil {
-		mError.Add(err)
-	}
-	log.With(zap.String("id", s.id)).Debug("space closed")
-	return mError.Err()
+	err := s.app.Close(context.Background())
+	log.Debug("space closed")
+	return err
 }
 
 func (s *space) TryClose(objectTTL time.Duration) (close bool, err error) {
 	if time.Now().Sub(s.objectSync.LastUsage()) < objectTTL {
 		return false, nil
 	}
-	locked := s.treesUsed.Load() > 1
-	log.With(zap.Int32("trees used", s.treesUsed.Load()), zap.Bool("locked", locked), zap.String("spaceId", s.id)).Debug("space lock status check")
+	locked := s.state.TreesUsed.Load() > 1
+	log.With(zap.Int32("trees used", s.state.TreesUsed.Load()), zap.Bool("locked", locked), zap.String("spaceId", s.state.SpaceId)).Debug("space lock status check")
 	if locked {
 		return false, nil
 	}

commonspace/spaceservice.go

@@ -2,26 +2,36 @@ package commonspace
 
 import (
 	"context"
+	"sync/atomic"
+
 	"github.com/anyproto/any-sync/accountservice"
 	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/app/logger"
+	"github.com/anyproto/any-sync/commonspace/config"
 	"github.com/anyproto/any-sync/commonspace/credentialprovider"
+	"github.com/anyproto/any-sync/commonspace/deletionstate"
 	"github.com/anyproto/any-sync/commonspace/headsync"
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/treemanager"
+	"github.com/anyproto/any-sync/commonspace/objectmanager"
 	"github.com/anyproto/any-sync/commonspace/objectsync"
+	"github.com/anyproto/any-sync/commonspace/objecttreebuilder"
 	"github.com/anyproto/any-sync/commonspace/peermanager"
+	"github.com/anyproto/any-sync/commonspace/requestmanager"
+	"github.com/anyproto/any-sync/commonspace/settings"
+	"github.com/anyproto/any-sync/commonspace/spacestate"
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
 	"github.com/anyproto/any-sync/metric"
 	"github.com/anyproto/any-sync/net/peer"
 	"github.com/anyproto/any-sync/net/pool"
 	"github.com/anyproto/any-sync/net/rpc/rpcerr"
 	"github.com/anyproto/any-sync/nodeconf"
-	"sync/atomic"
+	"storj.io/drpc"
 )
 
 const CName = "common.commonspace"
@@ -45,32 +55,30 @@ type SpaceService interface {
 }
 
 type spaceService struct {
-	config               Config
-	account              accountservice.Service
-	configurationService nodeconf.Service
-	storageProvider      spacestorage.SpaceStorageProvider
-	peermanagerProvider  peermanager.PeerManagerProvider
-	credentialProvider   credentialprovider.CredentialProvider
-	treeManager          treemanager.TreeManager
-	pool                 pool.Pool
-	metric               metric.Metric
+	config                config.Config
+	account               accountservice.Service
+	configurationService  nodeconf.Service
+	storageProvider       spacestorage.SpaceStorageProvider
+	peerManagerProvider   peermanager.PeerManagerProvider
+	credentialProvider    credentialprovider.CredentialProvider
+	statusServiceProvider syncstatus.StatusServiceProvider
+	treeManager           treemanager.TreeManager
+	pool                  pool.Pool
+	metric                metric.Metric
+	app                   *app.App
 }
 
 func (s *spaceService) Init(a *app.App) (err error) {
-	s.config = a.MustComponent("config").(ConfigGetter).GetSpace()
+	s.config = a.MustComponent("config").(config.ConfigGetter).GetSpace()
 	s.account = a.MustComponent(accountservice.CName).(accountservice.Service)
 	s.storageProvider = a.MustComponent(spacestorage.CName).(spacestorage.SpaceStorageProvider)
 	s.configurationService = a.MustComponent(nodeconf.CName).(nodeconf.Service)
 	s.treeManager = a.MustComponent(treemanager.CName).(treemanager.TreeManager)
-	s.peermanagerProvider = a.MustComponent(peermanager.CName).(peermanager.PeerManagerProvider)
-	credProvider := a.Component(credentialprovider.CName)
-	if credProvider != nil {
-		s.credentialProvider = credProvider.(credentialprovider.CredentialProvider)
-	} else {
-		s.credentialProvider = credentialprovider.NewNoOp()
-	}
+	s.peerManagerProvider = a.MustComponent(peermanager.CName).(peermanager.PeerManagerProvider)
+	s.statusServiceProvider = a.MustComponent(syncstatus.CName).(syncstatus.StatusServiceProvider)
 	s.pool = a.MustComponent(pool.CName).(pool.Pool)
 	s.metric, _ = a.Component(metric.CName).(metric.Metric)
+	s.app = a
 	return nil
 }
 
@@ -138,8 +146,6 @@ func (s *spaceService) NewSpace(ctx context.Context, id string) (Space, error) {
 			}
 		}
 	}
-
-	lastConfiguration := s.configurationService
 	var (
 		spaceIsClosed  = &atomic.Bool{}
 		spaceIsDeleted = &atomic.Bool{}
@@ -149,49 +155,46 @@ func (s *spaceService) NewSpace(ctx context.Context, id string) (Space, error) {
 		return nil, err
 	}
 	spaceIsDeleted.Swap(isDeleted)
-	getter := newCommonGetter(st.Id(), s.treeManager, spaceIsClosed)
-	syncStatus := syncstatus.NewNoOpSyncStatus()
-	// this will work only for clients, not the best solution, but...
-	if !lastConfiguration.IsResponsible(st.Id()) {
-		// TODO: move it to the client package and add possibility to inject StatusProvider from the client
-		syncStatus = syncstatus.NewSyncStatusProvider(st.Id(), syncstatus.DefaultDeps(lastConfiguration, st))
+	state := &spacestate.SpaceState{
+		SpaceId:        st.Id(),
+		SpaceIsDeleted: spaceIsDeleted,
+		SpaceIsClosed:  spaceIsClosed,
+		TreesUsed:      &atomic.Int32{},
 	}
-	var builder objecttree.BuildObjectTreeFunc
 	if s.config.KeepTreeDataInMemory {
-		builder = objecttree.BuildObjectTree
+		state.TreeBuilderFunc = objecttree.BuildObjectTree
 	} else {
-		builder = objecttree.BuildEmptyDataObjectTree
+		state.TreeBuilderFunc = objecttree.BuildEmptyDataObjectTree
 	}
-
-	peerManager, err := s.peermanagerProvider.NewPeerManager(ctx, id)
+	peerManager, err := s.peerManagerProvider.NewPeerManager(ctx, id)
 	if err != nil {
 		return nil, err
 	}
+	statusService := s.statusServiceProvider.NewStatusService()
+	spaceApp := s.app.ChildApp()
+	spaceApp.Register(state).
+		Register(peerManager).
+		Register(newCommonStorage(st)).
+		Register(statusService).
+		Register(syncacl.New()).
+		Register(requestmanager.New()).
+		Register(deletionstate.New()).
+		Register(settings.New()).
+		Register(objectmanager.New(s.treeManager)).
+		Register(objecttreebuilder.New()).
+		Register(objectsync.New()).
+		Register(headsync.New())
 
-	headSync := headsync.NewHeadSync(id, spaceIsDeleted, s.config.SyncPeriod, lastConfiguration, st, peerManager, getter, syncStatus, s.credentialProvider, log)
-	objectSync := objectsync.NewObjectSync(id, spaceIsDeleted, lastConfiguration, peerManager, getter, st)
 	sp := &space{
-		id:            id,
-		objectSync:    objectSync,
-		headSync:      headSync,
-		syncStatus:    syncStatus,
-		treeManager:   getter,
-		account:       s.account,
-		configuration: lastConfiguration,
-		peerManager:   peerManager,
-		storage:       st,
-		treesUsed:     &atomic.Int32{},
-		treeBuilder:   builder,
-		isClosed:      spaceIsClosed,
-		isDeleted:     spaceIsDeleted,
-		metric:        s.metric,
+		state: state,
+		app:   spaceApp,
 	}
 	return sp, nil
 }
 
 func (s *spaceService) addSpaceStorage(ctx context.Context, spaceDescription SpaceDescription) (st spacestorage.SpaceStorage, err error) {
 	payload := spacestorage.SpaceStorageCreatePayload{
-		AclWithId: &aclrecordproto.RawAclRecordWithId{
+		AclWithId: &consensusproto.RawRecordWithId{
 			Payload: spaceDescription.AclPayload,
 			Id:      spaceDescription.AclId,
 		},
@@ -226,15 +229,19 @@ func (s *spaceService) getSpaceStorageFromRemote(ctx context.Context, id string)
 		return
 	}
 
-	cl := spacesyncproto.NewDRPCSpaceSyncClient(p)
-	res, err := cl.SpacePull(ctx, &spacesyncproto.SpacePullRequest{Id: id})
+	var res *spacesyncproto.SpacePullResponse
+	err = p.DoDrpc(ctx, func(conn drpc.Conn) error {
+		cl := spacesyncproto.NewDRPCSpaceSyncClient(conn)
+		res, err = cl.SpacePull(ctx, &spacesyncproto.SpacePullRequest{Id: id})
+		return err
+	})
 	if err != nil {
 		err = rpcerr.Unwrap(err)
 		return
 	}
 
 	st, err = s.createSpaceStorage(spacestorage.SpaceStorageCreatePayload{
-		AclWithId: &aclrecordproto.RawAclRecordWithId{
+		AclWithId: &consensusproto.RawRecordWithId{
 			Payload: res.Payload.AclPayload,
 			Id:      res.Payload.AclPayloadId,
 		},

commonspace/spacestate/shareddata.go

@@ -0,0 +1,25 @@
+package spacestate
+
+import (
+	"github.com/anyproto/any-sync/app"
+	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
+	"sync/atomic"
+)
+
+const CName = "common.commonspace.spacestate"
+
+type SpaceState struct {
+	SpaceId         string
+	SpaceIsDeleted  *atomic.Bool
+	SpaceIsClosed   *atomic.Bool
+	TreesUsed       *atomic.Int32
+	TreeBuilderFunc objecttree.BuildObjectTreeFunc
+}
+
+func (s *SpaceState) Init(a *app.App) (err error) {
+	return nil
+}
+
+func (s *SpaceState) Name() (name string) {
+	return CName
+}

commonspace/spacestorage/inmemorystorage.go

@@ -1,11 +1,15 @@
 package spacestorage
 
 import (
-	"github.com/anyproto/any-sync/commonspace/object/acl/aclrecordproto"
+	"context"
+
+	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/commonspace/object/acl/liststorage"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
+	"github.com/anyproto/any-sync/consensus/consensusproto"
+
 	"sync"
 )
 
@@ -21,8 +25,24 @@ type InMemorySpaceStorage struct {
 	sync.Mutex
 }
 
+func (i *InMemorySpaceStorage) Run(ctx context.Context) (err error) {
+	return nil
+}
+
+func (i *InMemorySpaceStorage) Close(ctx context.Context) (err error) {
+	return nil
+}
+
+func (i *InMemorySpaceStorage) Init(a *app.App) (err error) {
+	return nil
+}
+
+func (i *InMemorySpaceStorage) Name() (name string) {
+	return CName
+}
+
 func NewInMemorySpaceStorage(payload SpaceStorageCreatePayload) (SpaceStorage, error) {
-	aclStorage, err := liststorage.NewInMemoryAclListStorage(payload.AclWithId.Id, []*aclrecordproto.RawAclRecordWithId{payload.AclWithId})
+	aclStorage, err := liststorage.NewInMemoryAclListStorage(payload.AclWithId.Id, []*consensusproto.RawRecordWithId{payload.AclWithId})
 	if err != nil {
 		return nil, err
 	}
@@ -148,10 +168,6 @@ func (i *InMemorySpaceStorage) ReadSpaceHash() (hash string, err error) {
 	return i.spaceHash, nil
 }
 
-func (i *InMemorySpaceStorage) Close() error {
-	return nil
-}
-
 func (i *InMemorySpaceStorage) AllTrees() map[string]treestorage.TreeStorage {
 	i.Lock()
 	defer i.Unlock()

commonspace/spacestorage/mock_spacestorage/mock_spacestorage.go

@@ -5,13 +5,15 @@
 package mock_spacestorage
 
 import (
+	context "context"
 	reflect "reflect"
 
+	app "github.com/anyproto/any-sync/app"
 	liststorage "github.com/anyproto/any-sync/commonspace/object/acl/liststorage"
 	treechangeproto "github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	treestorage "github.com/anyproto/any-sync/commonspace/object/tree/treestorage"
 	spacesyncproto "github.com/anyproto/any-sync/commonspace/spacesyncproto"
-	gomock "github.com/golang/mock/gomock"
+	gomock "go.uber.org/mock/gomock"
 )
 
 // MockSpaceStorage is a mock of SpaceStorage interface.
@@ -53,17 +55,17 @@ func (mr *MockSpaceStorageMockRecorder) AclStorage() *gomock.Call {
 }
 
 // Close mocks base method.
-func (m *MockSpaceStorage) Close() error {
+func (m *MockSpaceStorage) Close(arg0 context.Context) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Close")
+	ret := m.ctrl.Call(m, "Close", arg0)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
 // Close indicates an expected call of Close.
-func (mr *MockSpaceStorageMockRecorder) Close() *gomock.Call {
+func (mr *MockSpaceStorageMockRecorder) Close(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockSpaceStorage)(nil).Close))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockSpaceStorage)(nil).Close), arg0)
 }
 
 // CreateTreeStorage mocks base method.
@@ -110,6 +112,20 @@ func (mr *MockSpaceStorageMockRecorder) Id() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Id", reflect.TypeOf((*MockSpaceStorage)(nil).Id))
 }
 
+// Init mocks base method.
+func (m *MockSpaceStorage) Init(arg0 *app.App) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Init", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Init indicates an expected call of Init.
+func (mr *MockSpaceStorageMockRecorder) Init(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Init", reflect.TypeOf((*MockSpaceStorage)(nil).Init), arg0)
+}
+
 // IsSpaceDeleted mocks base method.
 func (m *MockSpaceStorage) IsSpaceDeleted() (bool, error) {
 	m.ctrl.T.Helper()
@@ -125,6 +141,20 @@ func (mr *MockSpaceStorageMockRecorder) IsSpaceDeleted() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsSpaceDeleted", reflect.TypeOf((*MockSpaceStorage)(nil).IsSpaceDeleted))
 }
 
+// Name mocks base method.
+func (m *MockSpaceStorage) Name() string {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Name")
+	ret0, _ := ret[0].(string)
+	return ret0
+}
+
+// Name indicates an expected call of Name.
+func (mr *MockSpaceStorageMockRecorder) Name() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Name", reflect.TypeOf((*MockSpaceStorage)(nil).Name))
+}
+
 // ReadSpaceHash mocks base method.
 func (m *MockSpaceStorage) ReadSpaceHash() (string, error) {
 	m.ctrl.T.Helper()
@@ -140,6 +170,20 @@ func (mr *MockSpaceStorageMockRecorder) ReadSpaceHash() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ReadSpaceHash", reflect.TypeOf((*MockSpaceStorage)(nil).ReadSpaceHash))
 }
 
+// Run mocks base method.
+func (m *MockSpaceStorage) Run(arg0 context.Context) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Run", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Run indicates an expected call of Run.
+func (mr *MockSpaceStorageMockRecorder) Run(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Run", reflect.TypeOf((*MockSpaceStorage)(nil).Run), arg0)
+}
+
 // SetSpaceDeleted mocks base method.
 func (m *MockSpaceStorage) SetSpaceDeleted() error {
 	m.ctrl.T.Helper()