socket.io + express in node.js for multiplayer games

socket.io.example.js

	//We will call this file server.js

var app = require('express').createServer(),
	io = require('socket.io').listen(app),
	url = require('url'),
	pth = require('path'),
	UUID = require('node-uuid');


/* Start of express/web server code. note this is just thrown here quick so you can grasp how it works. This obviously isn't good code or anything. */

 	var port = 3000;

		//Start the express server,
		//this sends the files to the clients
	app.listen(port);


		//This is express, too. Just an example of how to handle a request
		//This takes all requests at the / of the server, and returns index.html
		//from the same directory as the 'server.js' file
	app.get('/', function(req, res){
		res.sendfile(__dirname + '/index.html' );
	});

		//This is a more complex handler, allowing and disallowing 
		//access to certain parts of the code base and server files.
		//On a remote server, you might not want to serve all files like this
		//so be warned.

	var shouldServeBackend = false; 

	app.get('/*', function(req, res, next){
			
			//the 'file' they requested
		var file = req.params[0];
			
			//A flag to use at the end
	  	var shouldServe = false;

	  	if(!shouldServeBackend) {

	  			//rubbish hack, just as an example.
	  			//if they want a file from the media folder
	  			//of the game, thats ok
		  	if( file.substr(0,6) == 'media/' ) {
				shouldServe = true;
		  	} 

		  		//plus they need access to socket.io, allow it
		  	if( file.substr(0,10) == 'socket.io/' ) {
				shouldServe = true; 	
		  	} 

		  		//also, if they have not added a folder, but just a filename, allow it.
		  	if(file.indexOf('/') == -1) shouldServe = true;
		} else {
				//local testing can serve all files.
			shouldServe = true;
		}

	  	if(shouldServe) {
	  			//send the file to the client
	  		res.sendfile(__dirname + '/' + file);
	  	} else {
	  			//print a crappy 404 message.
	  		res.end('404 : File not found');
	  	}

	});

	/* End of express/web server code */


	/* Start of socket.io server code */


	//This just sets up the settings of the socket.io server. 

io.configure(function (){

		//this is a safe for all browsers option, still realtime though.
	io.set("transports", ["xhr-polling"]); 
	io.set("polling duration", 10); 
		//for less spam and useful information
	io.set('log level', 1);

		//default auth
	io.set('authorization', function (handshakeData, callback) {
	  	callback(null, true); // error first callback style 
	});

});


	//Now we can handle connections from the client
io.sockets.on('connection', function (socket) {

		//When a client connects, we send them a
		//message to authorise their play session. 
		//Once they get this they should know the server is 
		//up, can show status and can do a login with  
		//social services, and then request a session with us
		//with their database key.
	var clientid = UUID();
	socket.emit('_registerSession', {  key:clientid } );

		//on this client connection, log errors for now
	socket.on('error', function(d){
		console.log(d);
	});

	socket.on('any_game_event_you_want', function(d){
		//do game code
	});

});

	/* End of socket.io server code */