roomful (Dart) — alpha

Open-source, self-hostable realtime collaboration for Dart and Flutter apps — the pure-Dart core client. The Flutter widgets/overlays layer is the separate roomful_flutter package.

Status: v2.1-alpha (EP-11). Feature-complete — implements the Roomful Protocol v2 with capabilities, session negotiation, the versioned envelope, JSON and MessagePack codecs (validated against shared protocol fixtures), the relay control protocol, a RoomfulClient room lifecycle (join, peer registry, message relay, WebSocket transport, opt-in auto-reconnect), and the room primitives — presence, cursors, events, last-write-wins shared state, and advisory locks. pub.flutter-io.cn publication pending.

What works today

• ProtocolCapabilities + negotiateSession(...) — the exact v1..v2 / json↔msgpack negotiation from @roomful/core.
• WireMessage, encodeJsonEnvelope, decodeJsonEnvelope — the legacy v1 and modern v2 JSON envelopes.
• The relay control protocol — buildRelayJoin / buildRelayTransport / parseRelayServerFrame.
• RoomfulClient — connect and join a relay room, track peers, and relay messages over an injected transport.
• WebSocketRelayTransport — a RoomfulTransport over a WebSocket relay (or the Cloudflare edge relay).
• EventEngine — fire-and-forget room events (emit / on).
• PresenceEngine — live presence, cleaned up when peers leave and re-announced to newcomers.
• SharedStateEngine — last-write-wins shared state that converges across peers.
• CursorsEngine — live multiplayer cursors, cleared when peers leave.
• LocksEngine — advisory distributed locks with deterministic earliest-claim resolution.

Run the example:

dart run example/roomful_example.dart

Conformance

The protocol is validated against the shared cross-SDK vectors that the TypeScript @roomful/core generates (protocol-fixtures/core-vectors.json), so the Dart and JS SDKs share one contract (release gate G2):

dart test

The vectors cover negotiation, both envelope versions, and both the JSON and MessagePack codecs.

Roadmap

See the Roomful roadmap and the v2 → v3 backlog — EP-11 (this package) and EP-12 (roomful_flutter).