Socket.io: How to count clients in a room with Socket.io-redis adapter

Question

I start building chat server using Socket.io with multiple nodes. It uses Socket.io-redis to connect all servers together and rooms for messaging.

When a client connects

Answer 1

another approach is to use the customRequest/customHook methods in socket.io-redis 3.1.0. I tried and it works. Details here. https://github.com/socketio/socket.io-redis/issues/137