node.js chat server

gistfile1.js

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

app.listen(8888);

function handler (req, res) {
  fs.readFile(__dirname + req.url, function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading page');
    }
    res.writeHead(200);
    res.end(data);
  });
}

io.sockets.on('connection', function(socket){
  socket.on('set name', function(name) {
    socket.set('name', name, function() {
      socket.broadcast.send(name + ' has joined the conversation') 
    });
  });
 
  socket.on('message', function(data) {
    socket.get('name', function(err, name) {
      socket.broadcast.send(name + ' says: ' + data);
    });
  });
    
  socket.on('disconnect', function() {
    socket.get('name', function(err, name) {
      socket.broadcast.send(name + ' has left the conversation.');
    });
  });
});