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feat(presence): Redis-backed presence for multi-replica prod

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Extract a PresencePort seam (async setFocus/clearSocket/isViewing) with two
impls: the existing in-memory Map (dev, single instance) and a new
RedisPresenceService (prod). MessageModule provides PRESENCE_PORT via a
REDIS_URL-gated factory — same pattern as the socket.io Redis adapter — so
'who is viewing what' is shared across replicas and the notification projector's
presence gate works at N>1. Gateway + projector inject the port; isViewing is
now awaited. Presence spec updated to async (passing).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Maaz Ahamed
2026-07-23 15:52:53 +05:30
parent 90e37edf89
commit 1cbfddd4c2
8 changed files with 128 additions and 31 deletions
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packages/iios-service/src/messaging/message.module.ts
+13 -2
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@@ -3,10 +3,21 @@ import { MessageService } from './message.service';
import { MessageGateway } from './message.gateway';
import { OutboxModule } from '../outbox/outbox.module';
import { PresenceService } from '../notifications/presence.service';
import { RedisPresenceService } from '../notifications/redis-presence.service';
import { PRESENCE_PORT } from '../notifications/presence.port';
/**
* PRESENCE_PORT is single-instance in-memory by default; with REDIS_URL set it's Redis-backed so
* "who is viewing what" is shared across replicas (mirrors the socket.io Redis adapter gating).
*/
const presenceProvider = {
provide: PRESENCE_PORT,
useFactory: () => (process.env.REDIS_URL ? new RedisPresenceService(process.env.REDIS_URL) : new PresenceService()),
};
@Module({
imports: [OutboxModule],
providers: [MessageService, MessageGateway, PresenceService],
exports: [MessageService, PresenceService],
providers: [MessageService, MessageGateway, presenceProvider],
exports: [MessageService, PRESENCE_PORT],
})
export class MessageModule {}