NodeChat

chat.js

// Module dependencies.
var express = require('express')
  , stylus  = require('stylus')
  , nib     = require('nib')
  , sio     = require('socket.io')
  , app     = null;


// Create application server
app = express.createServer();


// App configuration
app.configure(function () {
  app.use(stylus.middleware({ src: __dirname + '/public', compile: compile }));
  app.use(express.static(__dirname + '/public'));
  app.set('views', __dirname);
  app.set('view engine', 'jade');

  function compile (str, path) {
    return stylus(str)
      .set('filename', path)
      .use(nib());
  };
});


// Add app routes
app.get('/', function (req, res) {
  res.render('index', { layout: false });
});

// Add app routes
app.get('/chat', function (req, res) {
  res.render('index', { layout: false });
});

// Define the port the server will listen on
app.listen(8888, function () {
  console.log('ChatSever listening on port: ' + app.address().port);
});

// Socket.IO server (single process only)
var io                  = sio.listen(app)
  , nicknames           = {}
  , numberofconnections = 0;

io.sockets.on('connection', function (socket) {
  
  io.sockets.emit('usersconnected', numberofconnections);

  socket.on('user message', function (msg) {
    socket.broadcast.emit('user message', socket.nickname, msg);
  });

  socket.on('nickname', function (nick, fn) {
    if (nicknames[nick]) {
      fn(true);
      io.sockets.emit('usersconnected', numberofconnections); 
    } else {
      fn(false);
      nicknames[nick] = socket.nickname = nick;
      numberofconnections++;
      io.sockets.emit('usersconnected', numberofconnections);      
      socket.broadcast.emit('announcement', nick + ' connected');
      io.sockets.emit('nicknames', nicknames);
    }
  });

  socket.on('disconnect', function () {
    if (!socket.nickname) return;
    numberofconnections--;
    delete nicknames[socket.nickname];
    socket.broadcast.emit('announcement', socket.nickname + ' disconnected');
    socket.broadcast.emit('usersconnected', numberofconnections);       
    socket.broadcast.emit('nicknames', nicknames);
  });
});