gistfile1.js

var sio = require('socket.io');
var io = sio.listen(8080);
global.channels = [];

var lobby = io.of('/lobby')
	.on('connection', function (lobby_socket) {
		
		lobby_socket.on('join channel', function (channel_name, channel_cb) {
			
			global.channels[channel_name] = io.of('/' + channel_name).authorization(function (handshakeData, auth_cb) {
				auth_cb(null, true);
			});
			
			channel_cb({'channel_id':channel_name});
			lobby_socket.leave();
			
			global.channels[channel_name].on('connection', function (channel_socket) {

				channel_socket.on('join room', function (room) {
					channel_socket.join(room);
				});

				channel_socket.on('chat message', function (msg) {
					channel_socket.broadcast.to(msg.room).emit('chat message', msg.msg);
				});

			});
			
		});
	});