nodejs realtime http server

realtime-http-server

var app = require('http').createServer(handler)
  , io = require('socket.io').listen(app)
  , fs = require('fs')

app.listen(80);

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);
  });
}

var users = 0;
io.sockets.on('connection', function (socket) {
	users++;
	console.log("user ++");
	io.sockets.emit('countChanged', {count:users });
	socket.on('disconnect', function (socket) {
		users--;
		console.log("user --");
   		io.sockets.emit('countChanged', {count:users});
	});
	
	socket.on('typing', function (data) {
   		io.sockets.emit('textChanged', {val:data.text});
	});
});