Fix keys and remove close waiter

node/nodespace/service.go

@@ -29,21 +29,17 @@ type Service interface {
 type service struct {
 	conf                 config.Space
 	spaceCache           ocache.OCache
-	closeWaiter          *ocache.CloseWaiter
 	commonSpace          commonspace.Service
 	spaceStorageProvider storage.SpaceStorageProvider
 }
 
 func (s *service) Init(a *app.App) (err error) {
-	s.closeWaiter = ocache.NewCloseWaiter(func(ctx context.Context, id string) (value ocache.Object, err error) {
-		return s.commonSpace.GetSpace(ctx, id)
-	})
 	s.conf = a.MustComponent(config.CName).(*config.Config).Space
 	s.commonSpace = a.MustComponent(commonspace.CName).(commonspace.Service)
 	s.spaceStorageProvider = a.MustComponent(storage.CName).(storage.SpaceStorageProvider)
 	s.spaceCache = ocache.New(
 		func(ctx context.Context, id string) (value ocache.Object, err error) {
-			return s.closeWaiter.Load(ctx, id)
+			return s.commonSpace.GetSpace(ctx, id)
 		},
 		ocache.WithLogger(log.Sugar()),
 		ocache.WithGCPeriod(time.Minute),
@@ -70,7 +66,7 @@ func (s *service) GetSpace(ctx context.Context, id string) (commonspace.Space, e
 	if err != nil {
 		return nil, err
 	}
-	return v.(*ocache.CloseWrapper).Value.(commonspace.Space), nil
+	return v.(commonspace.Space), nil
 }
 
 func (s *service) Close(ctx context.Context) (err error) {

node/storage/keys.go

@@ -1,7 +1,7 @@
 package storage
 
 import (
-	"fmt"
+	"bytes"
 	"strings"
 )
 
@@ -10,15 +10,15 @@ type treeKeys struct {
 }
 
 func (t treeKeys) HeadsKey() []byte {
-	return []byte(fmt.Sprintf("t/%s/heads", t.id))
+	return joinStringsToBytes("t", t.id, "heads")
 }
 
 func (t treeKeys) RootKey() []byte {
-	return []byte(fmt.Sprintf("t/%s", t.id))
+	return joinStringsToBytes("t", t.id)
 }
 
 func (t treeKeys) RawChangeKey(id string) []byte {
-	return []byte(fmt.Sprintf("t/%s/%s", t.id, id))
+	return joinStringsToBytes("t", t.id, id)
 }
 
 type spaceKeys struct {
@@ -36,5 +36,25 @@ func (s spaceKeys) ACLKey() []byte {
 }
 
 func isRootKey(key string) bool {
-	return strings.HasPrefix(key, "t/") && len(strings.Split(key, "/")) == 2
+	return strings.HasPrefix(key, "t/") && strings.Count(key, "/") == 2
+}
+
+func joinStringsToBytes(strs ...string) []byte {
+	var (
+		b        bytes.Buffer
+		totalLen int
+	)
+	for _, s := range strs {
+		totalLen += len(s)
+	}
+	// adding separators
+	totalLen += len(strs) - 1
+	b.Grow(totalLen)
+	for idx, s := range strs {
+		if idx > 0 {
+			b.WriteString("/")
+		}
+		b.WriteString(s)
+	}
+	return b.Bytes()
 }

node/storage/spacestorage.go

@@ -54,7 +54,6 @@ func newSpaceStorage(rootPath string, spaceId string) (store spacestorage.SpaceS
 }
 
 func createSpaceStorage(rootPath string, payload spacestorage.SpaceStorageCreatePayload) (store spacestorage.SpaceStorage, err error) {
-	// TODO: add payload verification
 	dbPath := path.Join(rootPath, payload.SpaceHeaderWithId.Id)
 	db, err := pogreb.Open(dbPath, defPogrebOptions)
 	if err != nil {

pkg/ocache/closewaiter.go

@@ -1,60 +0,0 @@
-package ocache
-
-import (
-	"context"
-	"sync"
-)
-
-type CloseWrapper struct {
-	Value Object
-	ch    chan struct{}
-}
-
-func (c *CloseWrapper) Close() (err error) {
-	err = c.Value.Close()
-	close(c.ch)
-	return err
-}
-
-type CloseWaiter struct {
-	load func(ctx context.Context, id string) (value Object, err error)
-
-	mx       sync.Mutex
-	closeMap map[string]chan struct{}
-}
-
-func NewCloseWaiter(load func(ctx context.Context, id string) (value Object, err error)) *CloseWaiter {
-	return &CloseWaiter{
-		load:     load,
-		closeMap: make(map[string]chan struct{}),
-	}
-}
-
-func (l *CloseWaiter) Load(ctx context.Context, id string) (value Object, err error) {
-	// this uses assumption of ocache, that for each id load function cannot be called simultaneously
-	var ch chan struct{}
-	l.mx.Lock()
-	if c, exists := l.closeMap[id]; exists {
-		ch = c
-	}
-	l.mx.Unlock()
-	if ch != nil {
-		<-ch
-	}
-
-	value, err = l.load(ctx, id)
-	if err != nil {
-		return
-	}
-
-	ch = make(chan struct{})
-	l.mx.Lock()
-	l.closeMap[id] = ch
-	l.mx.Unlock()
-
-	value = &CloseWrapper{
-		Value: value,
-		ch:    ch,
-	}
-	return
-}