server.js

var express = require('express'),
    fs = require('fs'),
    path = require('path'),
    ejs = require('ejs'),
    fs = require('fs');

/**
 *  Define the sample application.
 */
var SampleApp = function() {

    //  Scope.
    var self = this;


    /*  ================================================================  */
    /*  Helper functions.                                                 */
    /*  ================================================================  */

    /**
     *  Set up server IP address and port # using env variables/defaults.
     */
    self.setupVariables = function() {
        //  Set the environment variables we need.
        self.ipaddress = process.env.OPENSHIFT_NODEJS_IP || 'localhost';
        self.port = process.env.OPENSHIFT_NODEJS_PORT || 8080;

        var args = process.argv.slice(2);
        if (args.indexOf('--prod') != -1) {
            self.NODE_ENV = 'development'
        }

        if (typeof self.ipaddress === "undefined") {
            //  Log errors on OpenShift but continue w/ 127.0.0.1 - this
            //  allows us to run/test the app locally.
            console.warn('No OPENSHIFT_NODEJS_IP var, using 127.0.0.1');
            self.ipaddress = "127.0.0.1";
        };
    };


    /**
     *  Populate the cache.
     */
    self.populateCache = function() {
        if (typeof self.zcache === "undefined") {
            self.zcache = { 'index.html': '' };
        }

        //  Local cache for static content.
        // self.zcache['index.html'] = fs.readFileSync('./assets/tpl/views/503.html');
    };


    /**
     *  Retrieve entry (content) from cache.
     *  @param {string} key  Key identifying content to retrieve from cache.
     */
    self.cache_get = function(key) {
        return self.zcache[key];
    };


    /**
     *  terminator === the termination handler
     *  Terminate server on receipt of the specified signal.
     *  @param {string} sig  Signal to terminate on.
     */
    self.terminator = function(sig) {
        if (typeof sig === "string") {
            console.log('%s: Received %s - terminating sample app ...',
                Date(Date.now()), sig);
            process.exit(1);
        }
        console.log('%s: Node server stopped.', Date(Date.now()));
    };


    /**
     *  Setup termination handlers (for exit and a list of signals).
     */
    self.setupTerminationHandlers = function() {
        //  Process on exit and signals.
        process.on('exit', function() { self.terminator(); });

        // Removed 'SIGPIPE' from the list - bugz 852598.
        ['SIGHUP', 'SIGINT', 'SIGQUIT', 'SIGILL', 'SIGTRAP', 'SIGABRT',
            'SIGBUS', 'SIGFPE', 'SIGUSR1', 'SIGSEGV', 'SIGUSR2', 'SIGTERM'
        ].forEach(function(element, index, array) {
            process.on(element, function() { self.terminator(element); });
        });
    };


    /*  ================================================================  */
    /*  App server functions (main app logic here).                       */
    /*  ================================================================  */

    /**
     *  Create the routing table entries + handlers for the application.
     */
    self.createRoutes = function() {
        self.routes = {};

        // self.routes['/'] = function(req, res) {
        //     //we are not in a request handler so we may use readFileSync
        //     var content = fs.readFileSync(path.join(__dirname, 'public', 'views', 'index.html'), 'utf-8'),
        //         compiled = ejs.compile(content);
        //     res.writeHead(200, { 'Content-Type': 'text/html' });
        //     res.end(compiled({ NODE_ENV: self.NODE_ENV }));
        // };

        // self.routes['/favicon.ico'] = function(req, res) {
        //     res.setHeader('Content-Type', 'image/x-icon');
        //     res.send(fs.readFileSync(path.join(__dirname, 'assets/favicon.ico')));
        // };
    };


    /**
     *  Initialize the server (express) and create the routes and register
     *  the handlers.
     */
    self.initializeServer = function() {
        self.createRoutes();
        self.app = express();
        self.app.use('/', express.static(path.join(__dirname, 'public')));

        //  Add handlers for the app (from the routes).
        for (var r in self.routes) {
            self.app.get(r, self.routes[r]);
        }
    };


    /**
     *  Initializes the sample application.
     */
    self.initialize = function() {
        self.setupVariables();
        self.populateCache();
        self.setupTerminationHandlers();

        // Create the express server and routes.
        self.initializeServer();
    };


    /**
     *  Start the server (starts up the sample application).
     */
    self.start = function() {
        //  Start the app on the specific interface (and port).
        self.app.listen(self.port, self.ipaddress, function() {
            console.log('%s: Server started on %s:%d ...',
                Date(Date.now()), self.ipaddress, self.port);
        });
    };

}; /*  Sample Application.  */



/**
 *  main():  Main code.
 */
var zapp = new SampleApp();
zapp.initialize();
zapp.start();