syntax = "proto3";
package anySpace;
option go_package = "common/commonspace/spacesyncproto";

enum ErrCodes {
    Unexpected = 0;
}


service Space {
    // HeadSync compares all objects and their hashes in a space
    rpc HeadSync(HeadSyncRequest) returns (HeadSyncResponse);
    rpc Stream( stream Msg) returns (stream Msg);
}

// TODO: temporary mock message
message Msg {
    string spaceId = 1;
}



// 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;
}