node.js - socket.io not emit to rooms outside the context of Socket.IO processes with io.adapter(redis)

Question

I'm trying to emit events from outside the context of Socket.IO processes into specific room.

WORKING EXAMPLE of io.emit without specifying roomId:

 // client side
socket.emit('join-chat-room');
socket.on('client-side-channel', data => {
  console.log('Got message:', data);
});


// server side set redis adapter
const redisAdapter = require('socket.io-redis');
const redisUrl = env.REDIS_URL;
const pubClient = redis.createClient(redisUrl);
const subClient = redis.createClient(redisUrl);

const adapter = redisAdapter({ pubClient, subClient });
adapter.prototype.on('error', function (err) {
  log.error(`adapter error: ${err}`);
});

io.adapter(adapter);

WORKING: io.to(...).emit(...) in context of socket:

socket.on('join-chat-room', async () => {
  await socket.join('chat-room');
  io.to('chat-room').emit('client-side-channel', 'chat-data1');
});

NOT-WORKING: io.to(...).emit(...) from outside the context of Socket.IO processes:

io.to('chat-room').emit('client-side-channel', 'chat-data2');

but this works from outside the context of Socket.IO processes:

io.emit('client-side-channel', 'chat-data2');

Answer 1

等待大神答复