syntax = "proto3";
package anySpace;

option go_package = "commonspace/spacesyncproto";

enum ErrCodes {
    Unexpected = 0;
    SpaceMissing = 1;
    SpaceExists = 2;
    ErrorOffset = 100;
}

service Space {
    // HeadSync compares all objects and their hashes in a space
    rpc HeadSync(HeadSyncRequest) returns (HeadSyncResponse);
    // PushSpace sends new space to the node
    rpc PushSpace(PushSpaceRequest) returns (PushSpaceResponse);
    // Stream opens object sync stream with node or client
    rpc Stream(stream ObjectSyncMessage) returns (stream ObjectSyncMessage);
}

// HeadSyncRange presenting a request for one range
message HeadSyncRange {
    uint64 from = 1;
    uint64 to = 2;
    uint32 limit = 3;
}

// HeadSyncResult presenting a response for one range
message HeadSyncResult {
    bytes hash = 1;
    repeated HeadSyncResultElement elements = 2;
    uint32 count = 3;
}

// HeadSyncResultElement presenting state of one object
message HeadSyncResultElement {
    string id = 1;
    string head = 2;
}

// HeadSyncRequest is a request for HeadSync
message HeadSyncRequest {
    string spaceId = 1;
    repeated HeadSyncRange ranges = 2;
}

// HeadSyncResponse is a response for HeadSync
message HeadSyncResponse {
    repeated HeadSyncResult results = 1;
}

// ObjectSyncMessage is a message sent on object sync
message ObjectSyncMessage {
    string spaceId = 1;
    string replyId = 2;
    bytes payload = 3;
    string objectId = 4;
//  string identity = 5;
//  string peerSignature = 6;
}

// PushSpaceRequest is a request to add space on a node containing only one acl record
message PushSpaceRequest {
    RawSpaceHeaderWithId spaceHeader = 1;
    bytes aclPayload = 2;
    string aclPayloadId = 3;
}

// PushSpaceResponse is an empty response
message PushSpaceResponse {}

// SpaceHeader is a header for a space
message SpaceHeader {
    bytes identity = 1;
    int64 timestamp = 2;
    string spaceType = 3;
    uint64 replicationKey = 4;
    bytes seed = 5;
}

message RawSpaceHeader {
    bytes spaceHeader = 1;
    bytes signature = 2;
}

message RawSpaceHeaderWithId {
    bytes rawHeader = 1;
    string id = 2;
}