553dbac52f
Phase 6: Valkey availability mirror — move read path off Postgres
...
Mitra-availability state (online flag, deactivated flag, per-mitra session
count, heartbeat liveness) mirrored into Valkey so the customer beacon
+ pairing blast + dashboard counts no longer hit Postgres on the hot path.
Postgres remains the durable source of truth; Valkey state is fully
derivable via seedFromPostgres on startup + reconnect.
Schema
- mitras:online SET — mirror of is_online
- mitras:deactivated SET — mirror of is_active=false
- mitra:capacity:<id> STRING — active+pending_payment session count
- mitra💓 <id> STRING — ISO timestamp of last ping
- availability:snapshot JSON — beacon cache, TTL 10s, cluster-shared
Write paths (Postgres first, best-effort Valkey)
- setOnline/setOffline mirror SADD/SREM + heartbeat SET/DEL
- updateMitraStatus mirrors mitras:deactivated AND revokes auth_sessions
on deactivate (bounds the "ghost online" window to access-token TTL)
- heartbeat is Valkey-only on the hot path; the per-ping Postgres UPDATE
on last_heartbeat_at is eliminated (was 1,200 ops/min at prod scale)
- chat_session lifecycle (accept/end/reroute/extension/expiry) calls
recomputeCapacityForMitra after each UPDATE — derive-from-truth avoids
the bookkeeping risk of per-transition INCR/DECR
Read paths (Valkey-first, Postgres fallback on Valkey error)
- isMitraReachable: SISMEMBER mitras:online + heartbeat freshness
- findAvailableMitras: SDIFF + pipelined GETs, filter by capacity + heartbeat
- countAvailableMitrasFromCache: Valkey-driven, cached cluster-wide 10s TTL
- dashboard online count: SCARD
- Each reader wraps Valkey ops in try/catch → Postgres fallback on outage
Heartbeat path on /api/mitra/status/heartbeat
- resolveMitra preHandler replaced with heartbeatGuard: SISMEMBER on
mitras:deactivated (~0 DB hits per ping). Falls back to full DB
resolveMitra if Valkey is unreachable so a Valkey outage doesn't
silently accept heartbeats from deactivated mitras.
Three sweeps, env-configurable cadences
- MITRA_AUTO_OFFLINE_SWEEP_SECONDS (30) — Valkey-driven stale detection
- HEARTBEAT_MIRROR_INTERVAL_SECONDS (60) — batched UPSERT writes
Valkey timestamps to Postgres last_heartbeat_at via UNNEST (1 statement
per cycle, idempotent across instances)
- VALKEY_ONLINE_MIRROR_SWEEP_SECONDS (300) — periodic reseed heals drift
Startup
- restoreActiveTimers → seedFromPostgres → bind listeners
- onValkeyReady re-runs the seed on every reconnect (cold start + reseed
on Valkey restart, no manual intervention)
Failure semantics
- Read fallback: every Valkey read wrapped, falls back to existing
Postgres JOIN query — system stays correct during Valkey outage,
performance degrades not breaks
- Write best-effort: Postgres write commits before Valkey is touched;
Valkey errors log + continue; reconciliation sweep heals drift
- Auto-offline sweep aborts entirely on Valkey error (does NOT mass-
offline via Postgres scan during Valkey hiccup)
Tests
- New: 32 integration tests in mitra-status.valkey-mirror.test.js
covering seed, write-through, fallbacks, capacity lifecycle,
auto-offline sweep, heartbeat mirror, deactivation flow, beacon cache
- Updated: fixtures.js seeds Valkey alongside Postgres when isOnline=true
- Updated: helpers/db.js resetDb also flushes test Valkey
- Fixed 2 pre-existing session-timer flakes (string IDs failed uuid
parse; vi.advanceTimersByTimeAsync raced real Postgres I/O)
- All 124/124 backend tests pass (was 90/92)
Docs
- requirement/valkey-online-mirror-plan.md — canonical plan
- requirement/valkey-online-mirror-testing.md — manual E2E checklist
- requirement/deployment.md — infra + Valkey persistence guidance for
prod (Memorystore Standard tier recommended; migration from
self-hosted Valkey is zero-downtime via reseed-from-Postgres)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com >
2026-05-25 18:07:55 +08:00
844d7234e6
Phase 2 refinements: Firebase config, dev environment fixes, phase 3 requirement draft
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- Integrated Firebase SDK in both Flutter apps (google-services, firebase_options)
- Fixed auth flow, API client, and pairing/status blocs for dev environment
- Added full Flutter project scaffolds (android, ios, web, etc.)
- Added phase 3 chat engine requirement document
- Added bugreport zip pattern to gitignore
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com >
2026-04-07 19:16:34 +08:00
d668112edd
Phase 2 scaffold: mitra online status & pairing logic
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Add mitra online/offline status with heartbeat-based auto-offline,
customer-mitra pairing via Valkey pub/sub blast, session management,
and control center dashboard with real-time stats.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com >
2026-04-05 23:17:49 +08:00
