----- myData
      -------eqewrwrepere (this one is a device token)
                         ---------Lta+sde-fer (this one is a firebase id)
                                  firstvalue  : "a"
                                  secondvalue : "b"

                        ----------Qrgd+ad-qdda (this one is second firebase id)
                                  firstvalue  : "c"
                                  secondvalue : "d"

      -------eqwerSAsdqe (this one is another device token)
                        ---------Lta+sde-fer (this one is a firebase id)
                                 firstvalue  : "x"
                                 secondvalue : "y"

                       ----------Qrgd+ad-qdda (this one is second firebase id)
                                 firstvalue  : "z"
                                 secondvalue : "t"

'use strict';

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
var request = require('request');
var fs = require('fs');
//var fs = require("fs");
// Get a reference to the Cloud Vision API component
const Vision = require('@google-cloud/vision');
const vision = new Vision.ImageAnnotatorClient();
// Imports the Google Cloud client library
//const {Storage} = require('@google-cloud/storage');
var fs = require("fs");
var os = require("os");
var databaseArray = [];


exports.hourly_job = functions.pubsub
  .topic('fiyat-takip-et')
  .onPublish((event) => {
    console.log("Hourly Job");


    var db = admin.database();
    var ref = db.ref("myData")


   ref.once("value").then(function(allData) {

   allData.forEach(function(deviceToken) {

          deviceToken.forEach(function(firebaseIDs) {

        var deviceTokenVar = deviceToken.key;
        var firebaseIDVar = firebaseIDs.key;
        var firstvalue = firebaseIDs.child("firstvalue").val();
        var secondvalue = firebaseIDs.child("secondvalue").val();


        var items = [deviceTokenVar, firebaseIDVar, firstvalue, secondvalue];

        databaseArray.push([...items]);


});

});
return databaseArray;
}).then(function (databasem) {

    var i;
    for (i = 0; i < databaseArray.length; i++) {

        var databaseArrayDeviceToken = databaseArray[i][0];
        console.log("DeviceToken: " + databaseArrayDeviceToken);

        var databaseArrayFirebaseID = databaseArray[i][1];
        console.log("FirebaseID: " + databaseArrayFirebaseID);

        var databaseArrayfirstvalue = databaseArray[i][2];
        console.log("firstval: " + databaseArrayfirstvalue);

        var databaseArraysecondval = databaseArray[i][3];
        console.log("GuncelFiyat: " + databaseArraysecondval);


        var url = "http://api.blabla" + databaseArrayfirstvalue;

/////////////here make a request, pause loop, process returned image, but how //////////////////////
        request.get({url: url, encoding: 'binary'}, function (error, httpResponse, body) {


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

                fs.writeFileSync('/tmp/processed.jpg', body, 'binary')
                console.log("file written");
            })

}

});

return true;
});