timer/app.js

const 
    express = require('express'),
    app = module.exports = express(),
    server = require('http').createServer(app),
    Stopwatch = require('./models/stopwatch'),
    errorHandler = require('errorhandler'),
    expressLayouts = require('express-ejs-layouts'),
    io = require('socket.io')(server, {});

// Configuration

app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');

app.use(expressLayouts);
app.use(express.static(__dirname + '/public'));

if (process.env.NODE_ENV === 'development') {
    app.use(errorHandler({ dumpExceptions: true, showStack: true }));
}

if (process.env.NODE_ENV === 'production') {
    app.use(errorHandler());
}


// Use the port that Heroku provides or default to 5000
var port = process.env.PORT || 5000; 
var host = process.env.HOST || '0.0.0.0';

server.listen(port, host, function() {
    console.log("Express server listening on %j in %s mode", server.address(), app.settings.env);
});

var stopwatch = new Stopwatch();

stopwatch.on('tick:stopwatch', function(time) {
    io.sockets.emit('time', { time: time });
});

stopwatch.on('reset:stopwatch', function(time) {
    io.sockets.emit('time', { time: time });
});

stopwatch.start();

io.sockets.on('connection', function (socket) {
    io.sockets.emit('time', { time: stopwatch.getTime() });

    socket.on('click:start', function () {
        stopwatch.start();
    });

    socket.on('click:stop', function () {
        stopwatch.stop();
    });

    socket.on('click:zero', function () {
        stopwatch.zero();
    });

    socket.on('click:reset', function () {
        stopwatch.reset();
    });

    socket.on('click:resetShort', function () {
        stopwatch.resetShort();
    });
});


// configure title
//app.use(function (req, res, next) {
//    res.locals.title = process.env.TITLE || 'Timer'
//});

app.get('/', function(req, res) {
    res.render('index', { title: process.env.TITLE });
});


const control = express.Router();

control.get('/', function(req, res) {
    res.render('control', { title: process.env.TITLE });
});
control.post('/reset/', function (req, res) {
    stopwatch.reset();
    res.send("OK");
});
control.post('/reset-short/', function (req, res) {
    stopwatch.resetShort();
    res.send("OK");
});
control.post('/start-from-reset/', function (req, res) {
    stopwatch.reset();
    stopwatch.start();
    res.send("OK");
});
control.post('/start-from-reset-short/', function (req, res) {
    stopwatch.resetShort();
    stopwatch.start();
    res.send("OK");
});
control.post('/start/', function (req, res) {
    stopwatch.start();
    res.send("OK");
});
control.post('/stop/', function (req, res) {
    stopwatch.stop();
    res.send("OK");
});
control.post('/zero/', function (req, res) {
    stopwatch.zero();
    res.send("OK");
});

app.use('/control', control);