Sample GA adapter

ga.js

/**
 * ga.js - analytics adapter for google analytics
 */

var events = require('./../../events');
var utils = require('./../../utils');
var CONSTANTS = require('./../../constants.json');

var BID_TIMEOUT = CONSTANTS.EVENTS.BID_TIMEOUT;
var BID_WON = CONSTANTS.EVENTS.BID_WON;

var _disableInteraction = { nonInteraction: true };
var _analyticsQueue = [];
var _gaGlobal = null;
// var _enableCheck = true;
var _category = 'Prebid.js Bids';
var _eventCount = 0;
var _enableDistribution = false;
var _trackerSend = null;

/**
 * This will enable sending data to google analytics. Only call once, or duplicate data will be sent!
 * @param  {object} provider use to set GA global (if renamed);
 * @param  {object} options use to configure adapter;
 * @return {[type]}    [description]
 */
exports.enableAnalytics = function ({ provider, options }) {
  utils.logMessage('im running the ga file');

  _gaGlobal = provider || 'ga';
  _trackerSend = options && options.trackerName ? options.trackerName + '.send' : 'send';

  if (options && typeof options.enableDistribution !== 'undefined') {
    _enableDistribution = options.enableDistribution;
  }

  // var bid = null;
  //first send all events fired before enableAnalytics called

  // var existingEvents = events.getEvents();
  // utils._each(existingEvents, function (eventObj) {
  //   var args = eventObj.args;
  //   if (!eventObj) {
  //     return;
  //   }

  //   if (eventObj.eventType === BID_TIMEOUT) {
  //     const bidderArray = args;
  //     sendBidTimeouts(bidderArray);
  //   } else if (eventObj.eventType === BID_WON) {
  //     bid = args;
  //     sendBidWonToGa(bid);
  //   }
  //   console.log( 'existing events', existingEvents );
  // });

  //Next register event listeners to send data immediately

  // //bidRequests
  // events.on(BID_REQUESTED, function (bidRequestObj) {
  //   sendBidRequestToGa(bidRequestObj);
  // });

  // //bidResponses
  // events.on(BID_RESPONSE, function (bid) {
  //   sendBidResponseToGa(bid);
  // });

  //bidTimeouts
  events.on(BID_TIMEOUT, function (bidderArray) {
    sendBidTimeouts(bidderArray);
  });

  //wins
  events.on(BID_WON, function (bid) {
    sendBidWonToGa(bid);
  });

  // finally set this function to return log message, prevents multiple adapter listeners
  this.enableAnalytics = function _enable() {
    return utils.logMessage(`Analytics adapter already enabled, unnecessary call to \`enableAnalytics\`.`);
  };
};

exports.getTrackerSend = function getTrackerSend() {
  return _trackerSend;
};

function convertToCents(dollars) {
  if (dollars) {
    return Math.floor(dollars * 100);
  }

  return 0;
}

function sendBidTimeouts(timedOutBidders) {

  _analyticsQueue.push(function () {
    utils._each(timedOutBidders, function (bidderCode) {
      _eventCount++;
      window[_gaGlobal](_trackerSend, 'event', _category, 'Timeouts', bidderCode, _disableInteraction);
    });
  });

}

function sendBidWonToGa(bid) {
  var cpmCents = convertToCents(bid.cpm);
  _analyticsQueue.push(function () {
    _eventCount++;
    window[_gaGlobal](_trackerSend, 'event', _category, 'Wins', bid.bidderCode, cpmCents, _disableInteraction);
  });

}