node_helper.js

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

module.exports = NodeHelper.create({

    start: function () {
        console.log('MMM-stocks: started'); /*eslint-disable-line*/
    },

    getStocks: function (url) {
        var self = this;

        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 => {

            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;
                    throw new Error(err);
                }
            });
        });
    },

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