tools/playback_benchmark/playback.js

   1 // Copyright (c) 2012 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 Playback agent.
   7  */
   8
   9 var Benchmark = Benchmark || {};
  10
  11 /**
  12  * Playback agent class.
  13  * @param {Object} data Test data.
  14  * @constructor
  15  */
  16 Benchmark.Agent = function(data) {
  17   this.timeline = data.timeline;
  18   this.timelinePosition = 0;
  19   this.steps = data.steps;
  20   this.stepsPosition = 0;
  21   this.randoms = data.randoms;
  22   this.randomsPosition = 0;
  23   this.ticks = data.ticks;
  24   this.ticksPosition = 0;
  25   this.delayedScriptElements = {};
  26   this.callStackDepth = 0;
  27   document.cookie = data.cookie;
  28   if (window.innerWidth != data.width || window.innerHeight != data.height) {
  29     Benchmark.die('Wrong window size: ' +
  30                   window.innerWidth + 'x' + window.innerHeight +
  31                   ' instead of ' + data.width + 'x' + data.height);
  32   }
  33   this.startTime = Benchmark.originals.Date.now();
  34 };
  35
  36 /**
  37  * Returns current timeline event.
  38  * @return {Object} Event.
  39  */
  40 Benchmark.Agent.prototype.getCurrentEvent = function() {
  41   return this.timeline[this.timelinePosition];
  42 };
  43
  44 /**
  45  * Returns next recorded event in timeline. If event is the last event in
  46  * timeline, posts test results to driver.
  47  * @param {Object} event Event that actually happened, should correspond to
  48  * the recorded one (used for debug only).
  49  * @return {Object} Recorded event from timeline.
  50  */
  51 Benchmark.Agent.prototype.getNextEvent = function(event) {
  52   var recordedEvent = this.getCurrentEvent();
  53   this.ensureEqual(event, recordedEvent);
  54   if (event.type == 'random' || event.type == 'ticks') {
  55     recordedEvent.count -= 1;
  56     if (recordedEvent.count == 0) {
  57       this.timelinePosition += 1;
  58     }
  59   } else {
  60     this.timelinePosition += 1;
  61   }
  62   if (this.timelinePosition == this.steps[this.stepsPosition][1]) {
  63     var score = Benchmark.originals.Date.now() - this.startTime;
  64     Benchmark.reportScore(score);
  65   }
  66   return recordedEvent;
  67 };
  68
  69 /**
  70  * Checks if two events can be considered equal. Throws exception if events
  71  * differ.
  72  * @param {Object} event Event that actually happened.
  73  * @param {Object} recordedEvent Event taken from timeline.
  74  */
  75 Benchmark.Agent.prototype.ensureEqual = function(event, recordedEvent) {
  76   var equal = false;
  77   if (event.type == recordedEvent.type &&
  78       event.type in Benchmark.eventPropertiesMap) {
  79     equal = true;
  80     var properties = Benchmark.eventPropertiesMap[event.type];
  81     for (var i = 0; i < properties.length && equal; ++i)
  82       if (event[properties[i]] != recordedEvent[properties[i]])
  83         equal = false;
  84   }
  85   if (!equal) {
  86     Benchmark.die('unexpected event: ' + JSON.stringify(event) +
  87                   ' instead of ' + JSON.stringify(recordedEvent));
  88   }
  89 };
  90
  91 /**
  92  * Gets next event from timeline and returns its identifier.
  93  * @param {Object} event Object with event information.
  94  * @return {number} Event identifier.
  95  */
  96 Benchmark.Agent.prototype.createAsyncEvent = function(event) {
  97   return this.getNextEvent(event).id;
  98 };
  99
 100 /**
 101  * Stores callback to be invoked according to timeline order.
 102  * @param {number} eventId 'Parent' event identifier.
 103  * @param {function} callback Callback.
 104  */
 105 Benchmark.Agent.prototype.fireAsyncEvent = function(eventId, callback) {
 106   var event = this.timeline[eventId];
 107   if (!event.callbackReference) return;
 108   this.timeline[event.callbackReference].callback = callback;
 109   this.fireSome();
 110 };
 111
 112 /**
 113  * Ensures that things are happening according to recorded timeline.
 114  * @param {number} eventId Identifier of cancelled event.
 115  */
 116 Benchmark.Agent.prototype.cancelAsyncEvent = function(eventId) {
 117   this.getNextEvent({type: 'cancel', reference: eventId});
 118 };
 119
 120 /**
 121  * Checks if script isn't going to be executed too early and delays script
 122  * execution if necessary.
 123  * @param {number} scriptId Unique script identifier.
 124  * @param {HTMLElement} doc Document element.
 125  * @param {boolean} inlined Indicates whether script is a text block in the page
 126  * or resides in a separate file.
 127  * @param {string} src Script url (if script is not inlined).
 128  */
 129 Benchmark.Agent.prototype.readyToExecuteScript = function(scriptId, doc,
 130                                                           inlined, src) {
 131   var event = this.getCurrentEvent();
 132   if (event.type == 'willExecuteScript' && event.scriptId == scriptId) {
 133     this.timelinePosition += 1;
 134     return true;
 135   }
 136   var element;
 137   var elements = doc.getElementsByTagName('script');
 138   for (var i = 0, el; (el = elements[i]) && !element; ++i) {
 139     if (inlined) {
 140       if (el.src) continue;
 141       var text = el.textContent;
 142       if (scriptId == text.substring(2, text.indexOf("*/")))
 143         element = elements[i];
 144     } else {
 145       if (!el.src) continue;
 146       if (el.src.indexOf(src) != -1 || src.indexOf(el.src) != -1) {
 147         element = el;
 148       }
 149     }
 150   }
 151   if (!element) {
 152     Benchmark.die('script element not found', scriptId, src);
 153   }
 154   for (var el2 = element; el2; el2 = el2.parentElement) {
 155     if (el2.onload) {
 156       console.log('found', el2);
 157     }
 158   }
 159   this.delayedScriptElements[scriptId] = element;
 160   return false;
 161 };
 162
 163 /**
 164  * Ensures that things are happening according to recorded timeline.
 165  * @param {Object} event Object with event information.
 166  */
 167 Benchmark.Agent.prototype.didExecuteScript = function(scriptId ) {
 168   this.getNextEvent({type: 'didExecuteScript', scriptId: scriptId});
 169   this.fireSome();
 170 };
 171
 172 /**
 173  * Invokes async events' callbacks according to timeline order.
 174  */
 175 Benchmark.Agent.prototype.fireSome = function() {
 176   while (this.timelinePosition < this.timeline.length) {
 177     var event = this.getCurrentEvent();
 178     if (event.type == 'willFire') {
 179       if(!event.callback) break;
 180       this.timelinePosition += 1;
 181       this.callStackDepth += 1;
 182       event.callback();
 183       this.callStackDepth -= 1;
 184       this.getNextEvent({type: 'didFire', reference: event.reference});
 185     } else if (event.type == 'willExecuteScript') {
 186       if (event.scriptId in this.delayedScriptElements) {
 187         var element = this.delayedScriptElements[event.scriptId];
 188         var parent = element.parentElement;
 189         var cloneElement = element.cloneNode();
 190         delete this.delayedScriptElements[event.scriptId];
 191         parent.replaceChild(cloneElement, element);
 192       }
 193       break;
 194     } else if (this.callStackDepth > 0) {
 195       break;
 196     } else {
 197       Benchmark.die('unexpected event in fireSome:' + JSON.stringify(event));
 198     }
 199   }
 200 };
 201
 202 /**
 203  * Returns recorded random.
 204  * @return {number} Recorded random.
 205  */
 206 Benchmark.Agent.prototype.random = function() {
 207   this.getNextEvent({type: 'random'});
 208   return this.randoms[this.randomsPosition++];
 209 };
 210
 211 /**
 212  * Returns recorded ticks.
 213  * @return {number} Recorded ticks.
 214  */
 215 Benchmark.Agent.prototype.dateNow = function(event) {
 216   this.getNextEvent({type: 'ticks'});
 217   return this.ticks[this.ticksPosition++];
 218 };
 219
 220 /**
 221  * Event type -> property list mapping used for matching events.
 222  * @const
 223  */
 224 Benchmark.eventPropertiesMap = {
 225   'timeout': ['timeout'],
 226   'request': ['url'],
 227   'addEventListener': ['eventType'],
 228   'script load': ['src'],
 229   'willExecuteScript': ['scriptId'],
 230   'didExecuteScript': ['scriptId'],
 231   'willFire': ['reference'],
 232   'didFire': ['reference'],
 233   'cancel': ['reference'],
 234   'random': [],
 235   'ticks': []
 236 };
 237
 238 /**
 239  * Agent used by native window functions wrappers.
 240  */
 241 Benchmark.agent = new Benchmark.Agent(Benchmark.data);
 242
 243 /**
 244  * Playback flag.
 245  * @const
 246  */
 247 Benchmark.playback = true;
 248
 249 Benchmark.reportScore = function(score) {
 250   Benchmark.score = score;
 251 };
 252
 253 Benchmark.originals.addEventListenerToWindow.call(
 254     window, 'message', function(event) {
 255       if (Benchmark.score) {
 256         event.source.postMessage(Benchmark.score, event.origin);
 257       }
 258     }, false);