Functions cold start test

api-function.js

module.exports = function(context, req) {
    context.log('Node.js HTTP trigger function processed a request. RequestUri=%s', req.originalUrl);

    context.res = {
        // status: 200, /* Defaults to 200 */
        body: true
    };
    
    context.done();
};

idle-function.js

module.exports = function (context) {    
    context.done();
};

trigger-function.js

var request = require('request-promise');

var execute5 = 'https://<my function app for 5 minutes>/api/HttpTriggerNodeJS1';
var execute10 = 'https://<my function app for 10 minutes>/api/HttpTriggerNodeJS1';
var execute15 = 'https://<my function app for 15 minutes>/api/HttpTriggerNodeJS1';
var execute30 = 'https://<my function app for 30 minutes>/api/HttpTriggerNodeJS1';

var debugMode = false;

function getUrls() {
    var currentMinutes = (new Date()).getMinutes();
    var urls = [];
    if (currentMinutes % 5 === 0 || debugMode) {
        urls.push(execute5);
    }
    if (currentMinutes % 10 === 0 || debugMode) {
        urls.push(execute10);
    }
    if (currentMinutes % 15 === 0 || debugMode) {
        urls.push(execute15);
    }
    if (currentMinutes % 30 === 0 || debugMode) {
        urls.push(execute30);
    }
    return urls;
}

function makeRequest(obj) {
    var context = obj.context;
    var url = obj.url;
    context.log('Creating request for ' + url);
    var startTime = (new Date()).getTime();
    return request(url).then(function() {
      var endTime = (new Date()).getTime() - startTime;
      context.log(url + ' needed ' + endTime + 'ms to complete the request');
    });
}

module.exports = function (context) {
    //
    var requests = getUrls().map(function(url) {
      return makeRequest({
        url: url,
        context: context,
      });
    });

    if (requests.length === 0) {
      context.done();
      return;
    }

    Promise.all(requests)
    .then(function() { context.done() })
    .catch(function(error) {
        context.log('Error! ' + error);
        context.done();
    });
};