Adding Socket.io to an Express 4 Server - multiple file setup

I've been bouncing back and forth between socket.io and express.io - but settled for socket.io with Express 4, as I would like to use Namespaces.

I have worked on some examples of having an Express 4 Server using Socket.io - but most examples are based on one file with everything in it. I am trying to separate all my code to make it easier but I am at a loss as to how to add Socket.io (or where).

I have index.js which uses Cluster and basically calls server.js:

var server = require( "./server.js" ); var cluster = require('cluster'); var webApp={ run: function(){ console.log('Starting: Server'); server.listen(); } }; if(cluster.isMaster){ cluster.fork(); cluster.on('exit',function(worker){ console.log('Worker ' + worker.id + ' died..'); setTimeout( function () { cluster.fork(); }, 1000 ); }); } else{ try { webApp.run(); } catch(e) { console.log(e); process.exit(1); } process.on('uncaughtException', function(err){ console.log(err); process.exit(1); }); process.on( 'SIGINT', function () { console.log( "\n SIGINT (Crtl-C)" ); //Kill worker cluster.disconnect(); process.exit(1); }); } 

This then calls the server.js file:

var path = require('path'); var express = require('express'); var bodyParser = require('body-parser'); var config = require('./config/config.js'); var router = require('./routes'); var Server = Object.subClass({ /** * Constructor */ init:function(){ this.appServer = express(); var that = this; var appServer = this.appServer; appServer.use(express.static(__dirname + '/public')); appServer.set('views', path.join(__dirname, 'views')); appServer.set('view engine', 'ejs'); appServer.use(bodyParser.urlencoded({ extended: true })); appServer.use(bodyParser.json()); appServer.get('/',router.root); }, /** * Listener HTTP */ listen:function(){ var port = config.rest.port; console.log(':: on port:' + port); this.appServer.listen(port); } }); module.exports = new Server(); 

I am only having one 'route', which is the '/' and is defined in routes.js file. The page loads fine but where do I add the server side socket.io? and do I add any socket.io namespace definitions in the routes.js file or in the javascript of the page being loaded?

There are so many ways of using sockets that I can't seem to work out the best approach for my multi-file approach.

Any help would be brilliant as I seem to be going in circles.

Enjoy our Saturday :)

Thanks again.