server.js

#!/usr/bin/env node

/**
 * Module dependencies.
 */

const app = require('./app');
const debug = require('debug')('project2e:server');
const http = require('http');
const config = require('config');
const chalk = require('chalk');

/**
 * Get port from environment and store in Express.
 */
const port = normalizePort(config.SERVER.PORT || '80');
app.set('port', port);

/**
 * Create HTTP server.
 */
const server = http.createServer(app);

/**
 * Create Socket server.
 */

// const io = require('./socket');
// io.attach(server);

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Start script (services, ...)
 * */

require('./start_script');

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
    let port = parseInt(val, 10);

    if (isNaN(port)) {
        // named pipe
        return val;
    }

    if (port >= 0) {
        // port number
        return port;
    }

    return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
    if (error.syscall !== 'listen') {
        throw error;
    }

    let bind = typeof port === 'string'
        ? 'Pipe ' + port
        : 'Port ' + port;

    // handle specific listen errors with friendly messages
    switch (error.code) {
        case 'EACCES':
            console.error(bind + ' requires elevated privileges');
            process.exit(1);
            break;
        case 'EADDRINUSE':
            console.error(bind + ' is already in use');
            process.exit(1);
            break;
        default:
            throw error;
    }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
    let addr = server.address();
    let bind = typeof addr === 'string'
        ? 'pipe ' + addr
        : 'port ' + addr.port;
    debug('Listening on ' + bind);
    console.log(chalk`
    [Express] App is running at : {yellow ${app.get("port")}} in {yellow ${app.get("env")}} mode
    [Express] Press {red CTRL-C} to stop`);
}