This is a simple websocket server coded using nodejs and http://einaros.github.io/ws/ connecting to a redis pubsub channel and sending messages to selected clients

websocket-nodejs-redis-server.js

var ws    = require('ws'),
    nconf = require('nconf'),
    redis = require('redis');

nconf.argv()
     .env();

var server = new ws.Server({port: nconf.get('PORT')});

var sockets = {};

server.on('connection', function(socket) {
    socket.on('message', function(message) {
		var a = message.split('|');
		var playerId = a[0];
		console.log('received message from ' + playerId);
		sockets[playerId] = socket;
	});
});

var db = redis.createClient(nconf.get("REDIS_PORT"), nconf.get("REDIS_HOST"));
if (nconf.get('REDIS_PASSWORD')) {
	db.auth(nconf.get("REDIS_PASSWORD"));
}

db.on('message', function(channel, message) {
	if (channel == 'chanel')
	{
		var a = message.split('>');
		var socket = sockets[a[0]];
		var m = a[1];
		// les messages sont supposés contenir les ID utilisateurs
		//var socket = sockets[message];
		if (socket != undefined)
		{
			socket.send(m);
		}
	}
});

db.subscribe('channel');
console.log('listening at ws://localhost:' + nconf.get('PORT'));