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Roadmap

Done — relay hub complete

  • Rooms & Hub multiplexing — one Room per document, Hub.Join → Membership, Hub.MembersCount for observability.
  • Fan-out broadcast — echo-suppressed delivery to every other member.
  • Slow-peer drop — non-blocking sends; a full buffer drops the frame instead of stalling the hub.
  • Room GC — a room is reclaimed when its last member leaves.
  • Idempotent Leave and LeaveOnContextDone — safe, context-driven connection teardown.
  • Transport-agnostic core — no WebSocket library imported; the Membership handle is the seam.
  • Quality gate — 100% test coverage under -race, gofmt + go vet clean, CI green on all six 64-bit Go arches.

Planned — downstream by design

  • Persistence & snapshotting. The relay holds no durable state. Persistence is an opt-in layer that subscribes like any other member and serialises the last update to a backing store, replaying it to the first client that rejoins. It lives above the hub so the relay stays forward-compatible and small.
  • Awareness / presence surfacing. ConnID already carries a per-connection identity for tie-breaking; a thin presence view over the member set could be exposed for cursors / user lists.

The rendering and CRDT merge logic stay on the clients — that is the relay's whole premise, not a gap.