The WsRedisIoAdapter creates two ioredis clients (pubClient/subClient) for
@socket.io/redis-adapter but never closed them, leaking their TCP handles on
application shutdown (#255). The redis-adapter does not own these clients'
lifecycle, and the adapter is instantiated from main.ts (not a DI provider),
so no Nest lifecycle hook applied to it.
Keep references to both clients and override dispose(), which Nest's
SocketModule.close() invokes exactly once during shutdown after all socket.io
servers are closed. Use disconnect(false) to mirror the sibling pub/sub pair
in collaboration/extensions/redis-sync (onDestroy): immediate close, no QUIT
round-trip, no auto-reconnect. Refs are nulled to guard against double-close.
Runtime behavior is unchanged; only the shutdown path is added.
Verified with a script that boots connectToRedis() against a real Redis:
2 sockets to :6379 open after connect, 0 remain after dispose().
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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