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server.js

Application Server

 
             		           
                               
                            
                                
               
This is our single node.js process, which will provide us all 
of our server support and socket.io communication
             		                            
             		           
                               
                            
                                
               
dependencies



The server won't do everything for us out of the box, a few packages 
are required to make this process a little easier. All of these can 
be installed with npm
             		                            
var express = require('express')
  , http = require('http')
  , app = express()
  , server = http.createServer(app)
  , io = require('socket.io')
  , io = io.listen(server)
  , port = 9090
             		           
                               
                            
                                
               
Socket listeners
             		                            
             		           
                               
                            
                                
               
connection



A new socket.io connection has been established, lets let everyone 
connected know about the new client, then attatch all of our listeners 
on the connecting client's socket object
             		                            
io.sockets.on('connection', function(socket) {
             		           
                               
                            
                                
               
Someone connected
             		                            
  socket.broadcast.emit('connected', socket.id)
  
             		           
                               
                            
                                
               
Re-broadcast the message
             		                            
  socket.on('message', function(data) {
    socket.broadcast.emit('message', {
      id: socket.id
    , msg: data
    })
  })
             		           
                               
                            
                                
               
Someone has disconnected
             		                            
  socket.on('disconnect', function() {
    io.sockets.emit('disconnected', socket.id)
  })
})
             		           
                               
                            
                                
               
Express setup
             		                            
             		           
                               
                            
                                
               
Configure the express server with all of the relevant options, 
namely the location of our public static files, and the template 
engine that we will be parsing our dynamic HTML with
             		                            
app.configure(function() {
  app.use(express.static(__dirname + '/public'))
  app.set('view engine', 'jade')
})
             		           
                               
                            
                                
               
Routes
             		                            
             		           
                               
                            
                                
               
Create a route handler for the application, in this example we will 
only need a single route, GET / will be where the index file gets 
processed and served to the client
             		                            
app.get('/', function(req, res) {
  res.render('index.jade')
})
             		           
                               
                            
                                
               
Start server
             		                            
             		           
                               
                            
                                
               
Tell the express server to listen to the specified port, although 
the server is technically running, it wont be doing anything unless we 
tell it to listen for connections
             		                            
server.listen(port, function() {
  console.log('Application listening on port: ' + port)
})