Timeout Error When Using remoteJoin in a Different Namespace

[kewang]

We're encountering a timeout error when attempting to use the remoteJoin function from the socket.io-redis adapter. The error occurs when a client initially connects to the default (main) namespace, and the server tries to have the client join a room in the /bbb namespace using remoteJoin.

server code

const io = SocketIOServer(port, {
  allowEIO3: true,
  cors: {
    origin: [
      'https://example.com'
    ],
    methods: ['GET', 'POST'],
    credentials: true
  }
});

io.adapter(
  redisAdapter('redis-url', {
    auth_pass: 'redis-password',
    requestsTimeout: 3000
  })
);

io.on("connection", async socket => {
  io.of("/").adapter.remoteJoin(socket.id, "room-1");

  io.of("/bbb").adapter.remoteJoin(socket.id, "room-1");
});

client code

const socket = io();

server error log

2024-08-25T17:56:42.260288+00:00 app[web.1]: [3131] SOCKETIO join error
2024-08-25T17:56:42.260543+00:00 app[web.1]: Error: timeout reached while waiting for remoteJoin response
2024-08-25T17:56:42.260546+00:00 app[web.1]: at Timeout._onTimeout (/app/node_modules/socket.io-redis/dist/index.js:417:28)
2024-08-25T17:56:42.260555+00:00 app[web.1]: at listOnTimeout (node:internal/timers:557:17)
2024-08-25T17:56:42.260555+00:00 app[web.1]: at processTimers (node:internal/timers:500:7)

Steps to Reproduce

1. Connect a client to the main namespace using const socket = io();.
2. On the server side, use remoteJoin to join the client to a room in both the main (/) and /bbb namespaces.
3. Observe the timeout error in the server logs.

Expected Behavior

The client should successfully join the specified room in both namespaces without encountering a timeout error.

Actual Behavior

The remoteJoin operation times out when attempting to join the room in the /bbb namespace.

Additional Information

We are using the socket.io-redis adapter with a Redis server.
The issue seems related to using remoteJoin across different namespaces.