real time user tracking socket.io + Redis

index.html

<script src="socket.io/socket.io.js"></script>
<script>
  var socket = io.connect('http://localhost');
  socket.on('news', function (data) {
    console.log(data);
  });
  socket.emit('setinfo',{'bella merda':navigator.userAgent})
</script>

server.js

var app = require('http').createServer(handler)
  , io = require('socket.io').listen(app)
  , fs = require('fs')
  , redis = require("redis"),
  toJson = JSON.stringify,
  redisConn = redis.createClient(null,'10.64.98.222');

app.listen(81);

function handler (req, res) {
  fs.readFile(__dirname + '/index.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading index.html');
    }

    res.writeHead(200);
    res.end(data);
  });
}
redisConn.incr("node_count_test");
redisConn.decr("node_count_test");
 
io.sockets.on('connection', function (socket) {
  redisConn.incr("node_count_test");
  socket.on('setinfo', function(info){redisConn.lpush("node_list_test",toJson(info));socket.set('ts', info, function (){});});
  socket.on('disconnect',function(){
		socket.get('ts',function(err,i){
			console.log(toJson(i));
			redisConn.lrem("node_list_test",1,toJson(i));
		});
	});
});