node_helper.js

/* Magic Mirror
 * Module: stocks
 *
 * By Alex Yakhnin https://github.com/alexyak
 * MIT Licensed.
 */
var NodeHelper = require('node_helper');
var request = require('request');

module.exports = NodeHelper.create({

  start: function () {
    console.log('stocks helper started ...');
  },

  getStocks: function (url) {
      var self = this;
      console.log('requesting:' + url);
      request({ url: url, method: 'GET' }, function (error, response, body) {
          if (!error && response.statusCode == 200) {
              var result = JSON.parse(body);
              self.sendSocketNotification('STOCKS_RESULT', result);
          }
      });

  },

  getStocksMulti: function (urls) {
    var self = this;

    var count = urls.length;
    var counter = 0;
    var stockResults = [];

    urls.forEach(url => {
      console.log('url:' + url);
      request({ url: url, method: 'GET' }, function (error, response, body) {
        if (!error && response.statusCode == 200) {
            stockResults.push(JSON.parse(body));
            counter++;
            if (counter == count - 1) {
                self.sendSocketNotification('STOCKS_RESULT', stockResults);
            }
        }
        else {
            var err = error;
        }
    });
    });
    

},

  //Subclass socketNotificationReceived received.
  socketNotificationReceived: function(notification, payload) {
    if (notification === 'GET_STOCKS') {
        this.getStocks(payload);
    }
    if (notification === "GET_STOCKS_MULTI") {
       this.getStocksMulti(payload);
    }
  }

});