SaaS Performance Scripts

/**
 *  @author: https://github.com/mchicote
 *
 *  Node script that outputs the loading time of a group of requests
 *
 *  "dependencies": {
 *    "async": "^0.9.0",
 *    "debug": "~2.1.1",
 *    "request": "^2.53.0"
 *  } 
 */

var async = require('async'),
    request = require('request');

var testData = {
    testSuites: [
        {
            name: "Row 1",
            urls: [
                "http://23h1rq2wr18220xqby25x0kq.wpengine.netdna-cdn.com/wp-content/uploads/2015/03/app-icon.jpeg",
                "http://23h1rq2wr18220xqby25x0kq.wpengine.netdna-cdn.com/wp-content/uploads/2015/02/instagram-app-icon.jpeg",
                "http://23h1rq2wr18220xqby25x0kq.wpengine.netdna-cdn.com/wp-content/uploads/2014/11/app-icon1.png"
            ]
        },
        {
            name: "Row 2",
            urls: [
                "http://23h1rq2wr18220xqby25x0kq.wpengine.netdna-cdn.com/wp-content/uploads/2014/11/app-icon.png",
                "http://dy7kfdu8nfzkx.cloudfront.net/wp-content/uploads/2014/10/inbox.jpg",
                "http://dy7kfdu8nfzkx.cloudfront.net/wp-content/uploads/2014/08/hyperlapse.jpg"
            ]
        }
    ]
};

var PARALLEL_TEST_SUITE_LIMIT = 1, // How many test suite run in parallel
    PARALLEL_DOWNLOAD_LIMIT   = 1, // How many urls are fetched in parallel for a given test suite
    REPETITIONS               = 3; // How many repetitions are executed for each url

function requestImage(url, onRequestCompleted) {
    var start = new Date();
    request(url, function (error, response, body) {
        if (!error && response.statusCode == 200) {
            onRequestCompleted(start, new Date());
        }
    });
}

function downloadImagesSeries() {
    async.mapLimit(testData.testSuites, PARALLEL_TEST_SUITE_LIMIT, function(testSuite, onTestSuiteFinished) {
            async.mapLimit(testSuite.urls, PARALLEL_DOWNLOAD_LIMIT, function (url, onUrlFinished) {
                    async.timesSeries(REPETITIONS, function(i, onRequestFinished) {
                            requestImage(url, function (startTime, endTime) {
                                onRequestFinished(null, endTime - startTime);
                            });
                        }, function(err, times) {
                             var sum = times.reduce(function(a, b) { return a + b; });
                             onUrlFinished(null, {url: url, time: (sum / times.length) });
                        }
                    );
                }, function (err, urlsTimes) {
                     onTestSuiteFinished(null, { name: testSuite.name, times: urlsTimes });
                }
            );
        }, function(err, testSuiteResults) {
             printResults(testSuiteResults);
        }
    );
}

function printResults(testDataResults) {
    console.log("Perfomance Script Results");
    console.log("========================");

    testDataResults.forEach(function(testSuite) {
        console.log("Results for " + testSuite.name + ": ");
        var total = 0;
        testSuite.times.forEach(function(element) {
            console.log("URL: " + element.url + ". Time: " + element.time.toFixed(2));
            total += element.time;
        });

        console.log("TOTAL: " + total.toFixed(2));
        console.log("AVERAGE: " + (total / testSuite.times.length).toFixed(2));
        console.log("\r\n");
    });

    console.log("Finished Performance Script");
    console.log("========================");
}

downloadImagesSeries();