app.js

/* jslint node: true */
/* eslint-env node */
'use strict';

// Require express, socket.io, and vue
const express = require('express');
const app = express();
const http = require('http').Server(app);
const io = require('socket.io')(http);
const path = require('path');

// Pick arbitrary port for server
const port = 3000;
app.set('port', (process.env.PORT || port));

// Serve static assets from public/
app.use(express.static(path.join(__dirname, 'public/')));
// Serve vue from node_modules as vue/
app.use('/vue',
  express.static(path.join(__dirname, '/node_modules/vue/dist/')));
// Serve index.html directly as root page
app.get('/', function(req, res) {
  res.sendFile(path.join(__dirname, 'views/index.html'));
});
// Serve map.html as /map
app.get('/map', function(req, res) {
  res.sendFile(path.join(__dirname, 'views/map.html'));
});
// Serve dispatcher.html as /dispatcher
app.get('/dispatcher', function(req, res) {
  res.sendFile(path.join(__dirname, 'views/dispatcher.html'));
});

// Store data in an object to keep the global namespace clean and
// prepare for multiple instances of data if necessary
function Data() {
  this.orders = {};
}

/*
  Adds an order to to the queue
*/
Data.prototype.addOrder = function(order) {
  // Store the order in an "associative array" with orderId as key
  this.orders[order.orderId] = order;
};

Data.prototype.getAllOrders = function() {
  return this.orders;
};

const data = new Data();

io.on('connection', function(socket) {
  // Send list of orders when a client connects
  socket.emit('initialize', { orders: data.getAllOrders() });

  // When a connected client emits an "addOrder" message
  socket.on('addOrder', function(order) {
    data.addOrder(order);
    // send updated info to all connected clients,
    // note the use of io instead of socket
    io.emit('currentQueue', { orders: data.getAllOrders() });
  });

});

/* eslint-disable-next-line no-unused-vars */
const server = http.listen(app.get('port'), function() {
  console.log('Server listening on port ' + app.get('port'));
});