index.js

#!/usr/bin/env node

/**
 * Module dependencies.
 */

const app = require('./app/app').app;
const session = require('./app/app').session;
const debug = require('debug')('fake-puppy:server');
const http = require('http');
const configs = require('./configs/default');
const socket_router = require('./sockets/socket').socket_router;

/**
 * Get port from environment and store in Express.
 */

const port = normalizePort(process.env.PORT || configs.port);
app.set('port', port);

// HTTP server
// Socket.IO
const server = http.createServer(app);
const sio = require('socket.io')(server);

sio.use((socket, next) => {
    session(socket.request, socket.request.res, next);
});
/**
 * Listen on provided port, on all network interfaces.
 */

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

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

function normalizePort(val) {
  var 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;
  }

  var 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() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}

sio.on('connection', function (socket) {
  // hand shake and listen
  socket.emit('loading', { data: 'ping' });
  socket_router(socket);
});