server.js

// server.js

// BASE SETUP
// =============================================================================

// call the packages we need
var express    = require('express'); 		// call express
var app        = express(); 				// define our app using express
var async      = require('async');          // http://www.sebastianseilund.com/nodejs-async-in-practice
var weather    = require('./weather.js');

var port = process.env.PORT || 8080; 		// set our port

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router(); 				// get an instance of the express Router

// middleware to use for all requests
router.use(function(req, res, next) {
    // do logging
    console.log('Something is happening.');
    next(); // make sure we go to the next routes and don't stop here
});

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our cycle api!' });	
});

router.get('/v1/cycle', function(req, res, next) {
    var location = req.query.location;
    var airQualities = req.query.airquality;
    var shouldicycle = {};
    shouldicycle.pollution = [];

    async.parallel([
        // Get weather
        function(callback) {
            if (location) {
                weather.lookupCurrentWeather(location, shouldicycle, callback);
            }
            else {
                callback();
            }
        },
        // Get airquality
        function(callback) {
            if (airQualities) {
                var airQualityArray = airQualities.split(',');
                async.forEach(airQualityArray, function(airQuality, airQualityCallback) {
                    weather.lookupAirQuality(airQuality, shouldicycle, airQualityCallback);
                }, callback);
            }
            else {
                callback();
            }
        }
    ], 
    // This is called when weather and airquality are done
    function(err) {
        if (err) return next(res.status(err.code).json(err));
        res.json(shouldicycle);	
    });
});

// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api
app.use('/api', router);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);