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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Classes and functions used during recording and playback.
*/
var Benchmark = Benchmark || {};
Benchmark.functionList = [
['setTimeout', 'setTimeout'],
['clearTimeout', 'clearTimeout'],
['setInterval', 'setInterval'],
['clearInterval', 'clearInterval'],
['XMLHttpRequest', 'XMLHttpRequest'],
['addEventListenerToWindow', 'addEventListener'],
['addEventListenerToNode', 'addEventListener', ['Node', 'prototype']],
['removeEventListenerFromNode', 'removeEventListener', ['Node', 'prototype']],
['addEventListenerToXHR', 'addEventListener',
['XMLHttpRequest', 'prototype']],
['random', 'random', ['Math']],
['Date', 'Date'],
['documentWriteln', 'writeln', ['document']],
['documentWrite', 'write', ['document']]
];
Benchmark.timeoutMapping = [];
Benchmark.ignoredListeners = ['mousemove', 'mouseover', 'mouseout'];
Benchmark.originals = {};
Benchmark.overrides = {
setTimeout: function(callback, timeout) {
var event = {type: 'timeout', timeout: timeout};
var eventId = Benchmark.agent.createAsyncEvent(event);
var timerId = Benchmark.originals.setTimeout.call(this, function() {
Benchmark.agent.fireAsyncEvent(eventId, callback);
}, Benchmark.playback ? 0 : timeout);
Benchmark.timeoutMapping[timerId] = eventId;
return timerId;
},
clearTimeout: function(timerId) {
var eventId = Benchmark.timeoutMapping[timerId];
if (eventId == undefined) return;
Benchmark.agent.cancelAsyncEvent(eventId);
Benchmark.originals.clearTimeout.call(this, timerId);
},
setInterval: function(callback, timeout) {
console.warn('setInterval');
},
clearInterval: function(timerId) {
console.warn('clearInterval');
},
XMLHttpRequest: function() {
return new Benchmark.XMLHttpRequestWrapper();
},
addEventListener: function(type, listener, useCapture, target, targetType,
originalFunction) {
var event = {type: 'addEventListener', target: targetType, eventType: type};
var eventId = Benchmark.agent.createAsyncEvent(event);
listener.eventId = eventId;
listener.wrapper = function(e) {
Benchmark.agent.fireAsyncEvent(eventId, function() {
listener.call(target, e);
});
};
originalFunction.call(target, type, listener.wrapper, useCapture);
},
addEventListenerToWindow: function(type, listener, useCapture) {
if (Benchmark.ignoredListeners.indexOf(type) != -1) return;
Benchmark.overrides.addEventListener(
type, listener, useCapture, this, 'window',
Benchmark.originals.addEventListenerToWindow);
},
addEventListenerToNode: function(type, listener, useCapture) {
if (Benchmark.ignoredListeners.indexOf(type) != -1) return;
Benchmark.overrides.addEventListener(
type, listener, useCapture, this, 'node',
Benchmark.originals.addEventListenerToNode);
},
addEventListenerToXHR: function(type, listener, useCapture) {
Benchmark.overrides.addEventListener(
type, listener, useCapture, this, 'xhr',
Benchmark.originals.addEventListenerToXHR);
},
removeEventListener: function(type, listener, useCapture, target,
originalFunction) {
Benchmark.agent.cancelAsyncEvent(listener.eventId);
originalFunction.call(target, listener.wrapper, useCapture);
},
removeEventListenerFromWindow: function(type, listener, useCapture) {
removeEventListener(type, listener, useCapture, this,
Benchmark.originals.removeEventListenerFromWindow);
},
removeEventListenerFromNode: function(type, listener, useCapture) {
removeEventListener(type, listener, useCapture, this,
Benchmark.originals.removeEventListenerFromNode);
},
removeEventListenerFromXHR: function(type, listener, useCapture) {
removeEventListener(type, listener, useCapture, this,
Benchmark.originals.removeEventListenerFromXHR);
},
random: function() {
return Benchmark.agent.random();
},
Date: function() {
var a = arguments;
var D = Benchmark.originals.Date, d;
switch(a.length) {
case 0: d = new D(Benchmark.agent.dateNow()); break;
case 1: d = new D(a[0]); break;
case 2: d = new D(a[0], a[1]); break;
case 3: d = new D(a[0], a[1], a[2]); break;
default: Benchmark.die('window.Date', arguments);
}
d.getTimezoneOffset = function() { return -240; };
return d;
},
dateNow: function() {
return Benchmark.agent.dateNow();
},
documentWriteln: function() {
console.warn('writeln');
},
documentWrite: function() {
console.warn('write');
}
};
/**
* Replaces window functions specified by Benchmark.functionList with overrides
* and optionally saves original functions to Benchmark.originals.
* @param {Object} wnd Window object.
* @param {boolean} storeOriginals When true, original functions are saved to
* Benchmark.originals.
*/
Benchmark.installOverrides = function(wnd, storeOriginals) {
// Substitute window functions with overrides.
for (var i = 0; i < Benchmark.functionList.length; ++i) {
var info = Benchmark.functionList[i], object = wnd;
var propertyName = info[1], pathToProperty = info[2];
if (pathToProperty)
for (var j = 0; j < pathToProperty.length; ++j)
object = object[pathToProperty[j]];
if (storeOriginals)
Benchmark.originals[info[0]] = object[propertyName];
object[propertyName] = Benchmark.overrides[info[0]];
}
wnd.__defineSetter__('onload', function() {
console.warn('window.onload setter')}
);
// Substitute window functions of static frames when DOM content is loaded.
Benchmark.originals.addEventListenerToWindow.call(wnd, 'DOMContentLoaded',
function() {
var frames = document.getElementsByTagName('iframe');
for (var i = 0, frame; frame = frames[i]; ++i) {
Benchmark.installOverrides(frame.contentWindow);
}
}, true);
// Substitute window functions of dynamically added frames.
Benchmark.originals.addEventListenerToWindow.call(
wnd, 'DOMNodeInsertedIntoDocument', function(e) {
if (e.target.tagName && e.target.tagName.toLowerCase() != 'iframe')
return;
if (e.target.contentWindow)
Benchmark.installOverrides(e.target.contentWindow);
}, true);
};
// Install overrides on top window.
Benchmark.installOverrides(window, true);
/**
* window.XMLHttpRequest wrapper. Notifies Benchmark.agent when request is
* opened, aborted, and when it's ready state changes to DONE.
* @constructor
*/
Benchmark.XMLHttpRequestWrapper = function() {
this.request = new Benchmark.originals.XMLHttpRequest();
this.wrapperReadyState = 0;
};
// Create XMLHttpRequestWrapper functions and property accessors using original
// ones.
(function() {
var request = new Benchmark.originals.XMLHttpRequest();
for (var property in request) {
if (property === 'channel') continue; // Quick fix for FF.
if (typeof(request[property]) == 'function') {
(function(property) {
var f = Benchmark.originals.XMLHttpRequest.prototype[property];
Benchmark.XMLHttpRequestWrapper.prototype[property] = function() {
f.apply(this.request, arguments);
};
})(property);
} else {
(function(property) {
Benchmark.XMLHttpRequestWrapper.prototype.__defineGetter__(property,
function() { return this.request[property]; });
Benchmark.XMLHttpRequestWrapper.prototype.__defineSetter__(property,
function(value) {
this.request[property] = value;
});
})(property);
}
}
})();
// Define onreadystatechange getter.
Benchmark.XMLHttpRequestWrapper.prototype.__defineGetter__('onreadystatechange',
function() { return this.clientOnReadyStateChange; });
// Define onreadystatechange setter.
Benchmark.XMLHttpRequestWrapper.prototype.__defineSetter__('onreadystatechange',
function(value) { this.clientOnReadyStateChange = value; });
Benchmark.XMLHttpRequestWrapper.prototype.__defineGetter__('readyState',
function() { return this.wrapperReadyState; });
Benchmark.XMLHttpRequestWrapper.prototype.__defineSetter__('readyState',
function() {});
/**
* Wrapper for XMLHttpRequest.open.
*/
Benchmark.XMLHttpRequestWrapper.prototype.open = function() {
var url = Benchmark.extractURL(arguments[1]);
var event = {type: 'request', method: arguments[0], url: url};
this.eventId = Benchmark.agent.createAsyncEvent(event);
var request = this.request;
var requestWrapper = this;
Benchmark.originals.XMLHttpRequest.prototype.open.apply(request, arguments);
request.onreadystatechange = function() {
if (this.readyState != 4 || requestWrapper.cancelled) return;
var callback = requestWrapper.clientOnReadyStateChange || function() {};
Benchmark.agent.fireAsyncEvent(requestWrapper.eventId, function() {
requestWrapper.wrapperReadyState = 4;
callback.call(request);
});
}
};
/**
* Wrapper for XMLHttpRequest.abort.
*/
Benchmark.XMLHttpRequestWrapper.prototype.abort = function() {
this.cancelled = true;
Benchmark.originals.XMLHttpRequest.prototype.abort.apply(
this.request, arguments);
Benchmark.agent.cancelAsyncEvent(this.eventId);
};
/**
* Driver url for reporting results.
* @const {string}
*/
Benchmark.DRIVER_URL = '/benchmark/';
/**
* Posts request as json to Benchmark.DRIVER_URL.
* @param {Object} request Request to post.
*/
Benchmark.post = function(request, async) {
if (async === undefined) async = true;
var xmlHttpRequest = new Benchmark.originals.XMLHttpRequest();
xmlHttpRequest.open("POST", Benchmark.DRIVER_URL, async);
xmlHttpRequest.setRequestHeader("Content-type", "application/json");
xmlHttpRequest.send(JSON.stringify(request));
};
/**
* Extracts url string.
* @param {(string|Object)} url Object or string representing url.
* @return {string} Extracted url.
*/
Benchmark.extractURL = function(url) {
if (typeof(url) == 'string') return url;
return url.nI || url.G || '';
};
/**
* Logs error message to console and throws an exception.
* @param {string} message Error message
*/
Benchmark.die = function(message) {
// Debugging stuff.
var position = top.Benchmark.playback ? top.Benchmark.agent.timelinePosition :
top.Benchmark.agent.timeline.length;
message = message + ' at position ' + position;
console.error(message);
Benchmark.post({error: message});
console.log(Benchmark.originals.setTimeout.call(window, function() {}, 9999));
try { (0)() } catch(ex) { console.error(ex.stack); }
throw message;
};