Fabric to Pushover: New Users

index.js

var Pushover = require('node-pushover');
var moment = require('moment');
var request = require('request');

// Fill out with your secrets
var secrets = {
  pushover: {
    token: '',
    user: ''
  },
  fabric: {
    organizationId: '',
    applicationId: '',
    cookie: '',
    crashlyticsDeveloperToken: ''
  }
}

if (!Array.prototype.last){
    Array.prototype.last = function(){
        return this[this.length - 1];
    };
};

var push = new Pushover({
    token: secrets.pushover.token,
    user: secrets.pushover.user
});

function requestOptions(fromDate, toDate) {
  return {
    url: 'https://fabric.io/api/v2/organizations/' + secrets.fabric.organizationId + '/apps/' + secrets.fabric.applicationId + '/growth_analytics/daily_new.json?start=' + fromDate + '&end=' + toDate + '&transformation=seasonal',
    method: 'GET',
    headers: {
      'Cookie': secrets.fabric.cookie,
      'X-CRASHLYTICS-DEVELOPER-TOKEN': secrets.fabric.crashlyticsDeveloperToken
    }
  }
}

function sendNotification(newUserCount) {

  push.send("New Road Code User!", "There are now " + newUserCount + " new users today.", function (err, res){
      if (err) {
          console.log("We have an error:");
          console.log(err);
          console.log(err.stack);
      } else {
          console.log("Message send successfully");
          console.log(res);
      }
  });
}

// Save a variable to the last known user count
var lastNewUserCount = 1

function updateLastUserCount() {
  // Fetch the UTC date of today + 1
  let date = moment().utc().startOf('date');

  let toDate = Math.floor(date / 1000)
  let fromDate = toDate - 60 * 60 * 24 * 5 // Last 5 days..

  let options = requestOptions(fromDate, toDate)

  console.info("Checking user count at " + moment().format('MMMM Do YYYY, h:mm:ss a'))

  request(options, function(error, response, body) {

    if (!error && response.statusCode == 200) {

      try {

        var json = JSON.parse(body)
        var lastEntry = json.series.last().last()

        console.info("New user count: " + lastEntry);

        // Update lastUserCount & send notification if the count is different
        // It can be different when it ticks over to a new day.
        if (lastNewUserCount != lastEntry) {
          sendNotification(lastEntry)
          lastNewUserCount = lastEntry
        } else {
          console.info("User count not changed")
        }

      } catch (e) {
          console.error("Failed to parse json response")
          console.error(e)
      }
    } else {
      console.error("Invalid response status code")
    }
  })
}

setInterval(function () {
  updateLastUserCount()
}, 1000 * 60 * 5);

// Perform the initial update
updateLastUserCount()

package.json

{
  "name": "pushover-monitor",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "moment": "^2.17.1",
    "node-pushover": "^0.2.2",
    "request": "^2.79.0"
  }
}