remoting/webapp/base/js/experiments.js

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview
   7  * Class for enabling experimental features.
   8  */
   9
  10 'use strict';
  11
  12 /** @suppress {duplicate} */
  13 var remoting = remoting || {};
  14
  15 (function () {
  16
  17 var kExperimentsStorageName = 'remoting-experiments';
  18
  19 /**
  20  * @param {Array.<string>} list
  21  */
  22 function save(list) {
  23   var storageMap = {};
  24   storageMap[kExperimentsStorageName] = list;
  25   chrome.storage.local.set(storageMap);
  26 };
  27
  28 /** @type {Object} */
  29 remoting.experiments = {};
  30
  31 /**
  32  * Enables an experiment.
  33  *
  34  * @param {string} experiment to enable.
  35  */
  36 remoting.experiments.enable = function(experiment) {
  37   remoting.experiments.get().then(function(/** Array.<string> */list) {
  38     if (list.indexOf(experiment) == -1) {
  39       list.push(experiment);
  40       save(list);
  41     }
  42   });
  43 };
  44
  45 /**
  46  * Disables an experiment.
  47  *
  48  * @param {string} experiment to disable.
  49  */
  50 remoting.experiments.disable = function(experiment) {
  51   remoting.experiments.get().then(function(/** Array.<string> */list) {
  52     list = list.filter(function(e) { return e !== experiment; });
  53     save(list);
  54   });
  55 };
  56
  57 /**
  58  * Returns list of all enabled experiments.
  59  * @return {Promise}
  60  */
  61 remoting.experiments.get = function() {
  62   return new Promise(function(resolve, reject) {
  63     chrome.storage.local.get(kExperimentsStorageName, function(items) {
  64       if (items.hasOwnProperty(kExperimentsStorageName)) {
  65         resolve(items[kExperimentsStorageName]);
  66       }
  67       resolve([]);
  68     });
  69   });
  70 };
  71
  72 })();