Add Prometheus metrics for federation links (per-peer RTT, packet
counters, active rooms gauge, dedup/rate-limit drop counters).
Add dedup filter (4096-entry ring buffer) to drop duplicate packets
arriving via multiple federation paths. Add per-room token bucket
rate limiter (500 pps) to prevent amplification.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
RouteResolver queries PresenceRegistry to determine how to reach a target:
- Route::Local — connected to this relay
- Route::DirectPeer(addr) — on a directly connected peer relay
- Route::Chain(addrs) — multi-hop (structure ready, single-hop for now)
- Route::NotFound — not in any known relay
Protocol: added SignalMessage::RouteQuery { fingerprint, ttl } and
RouteResponse { fingerprint, found, relay_chain } for peer-to-peer
route queries over probe connections.
HTTP API: GET /route/:fingerprint returns JSON with route type + chain.
Relay handles incoming RouteQuery on probe connections: looks up locally,
replies with RouteResponse. TTL decremented for future multi-hop forwarding.
55 relay tests + 42 proto tests passing (7 new route tests).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
PresenceRegistry tracks who is connected where:
- register_local/unregister_local for directly connected users
- update_peer for fingerprints reported by peer relays
- lookup returns Local or Remote(addr)
- expire_stale removes entries older than timeout
Gossip via probe connections:
- New SignalMessage::PresenceUpdate { fingerprints, relay_addr }
- Probes send local fingerprints every 10s alongside Ping/Pong
- Receiving relay updates its remote presence table
HTTP API on metrics port:
- GET /presence — all known fingerprints + locations
- GET /presence/:fingerprint — single lookup
- GET /peers — peer relays + their connected users
Wired into relay main:
- Registry created at startup
- register_local after auth+handshake
- unregister_local on disconnect
- Passed to probe mesh and metrics server
Also marks FC-10 as DONE in integration tracker.
48 relay tests + 42 proto tests passing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
