puppeteer/lib/DOMWorld.js
Andrey Lushnikov 20988775bf
fix: gracefully handle multiple contexts for secondary DOM World (#4276)
In case of multiple sessions to the same target, there's a race between
sessions to create a secondary isolated world. As a result, we might
end up having 2 execution contexts created for the needs of the
secondary isolated world.

This patch starts handling this race gracefully: instead of crashing,
we can use either of the execution contexts and ignore the rest.

Notably, the same race condition might happen if page reloads itself
in-between the calls to `page.addEvaluateOnNewDocument` and
`page.createIsolatedWorld`.

Fixes #4197.
2019-04-11 16:26:18 -04:00

720 lines
20 KiB
JavaScript

/**
* Copyright 2019 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const fs = require('fs');
const {helper, assert} = require('./helper');
const {LifecycleWatcher} = require('./LifecycleWatcher');
const {TimeoutError} = require('./Errors');
const readFileAsync = helper.promisify(fs.readFile);
/**
* @unrestricted
*/
class DOMWorld {
/**
* @param {!Puppeteer.FrameManager} frameManager
* @param {!Puppeteer.Frame} frame
* @param {!Puppeteer.TimeoutSettings} timeoutSettings
*/
constructor(frameManager, frame, timeoutSettings) {
this._frameManager = frameManager;
this._frame = frame;
this._timeoutSettings = timeoutSettings;
/** @type {?Promise<!Puppeteer.ElementHandle>} */
this._documentPromise = null;
/** @type {!Promise<!Puppeteer.ExecutionContext>} */
this._contextPromise;
this._contextResolveCallback = null;
this._setContext(null);
/** @type {!Set<!WaitTask>} */
this._waitTasks = new Set();
this._detached = false;
}
/**
* @return {!Puppeteer.Frame}
*/
frame() {
return this._frame;
}
/**
* @param {?Puppeteer.ExecutionContext} context
*/
_setContext(context) {
if (context) {
this._contextResolveCallback.call(null, context);
this._contextResolveCallback = null;
for (const waitTask of this._waitTasks)
waitTask.rerun();
} else {
this._documentPromise = null;
this._contextPromise = new Promise(fulfill => {
this._contextResolveCallback = fulfill;
});
}
}
/**
* @return {boolean}
*/
_hasContext() {
return !this._contextResolveCallback;
}
_detach() {
this._detached = true;
for (const waitTask of this._waitTasks)
waitTask.terminate(new Error('waitForFunction failed: frame got detached.'));
}
/**
* @return {!Promise<!Puppeteer.ExecutionContext>}
*/
executionContext() {
if (this._detached)
throw new Error(`Execution Context is not available in detached frame "${this._frame.url()}" (are you trying to evaluate?)`);
return this._contextPromise;
}
/**
* @param {Function|string} pageFunction
* @param {!Array<*>} args
* @return {!Promise<!Puppeteer.JSHandle>}
*/
async evaluateHandle(pageFunction, ...args) {
const context = await this.executionContext();
return context.evaluateHandle(pageFunction, ...args);
}
/**
* @param {Function|string} pageFunction
* @param {!Array<*>} args
* @return {!Promise<*>}
*/
async evaluate(pageFunction, ...args) {
const context = await this.executionContext();
return context.evaluate(pageFunction, ...args);
}
/**
* @param {string} selector
* @return {!Promise<?Puppeteer.ElementHandle>}
*/
async $(selector) {
const document = await this._document();
const value = await document.$(selector);
return value;
}
/**
* @return {!Promise<!Puppeteer.ElementHandle>}
*/
async _document() {
if (this._documentPromise)
return this._documentPromise;
this._documentPromise = this.executionContext().then(async context => {
const document = await context.evaluateHandle('document');
return document.asElement();
});
return this._documentPromise;
}
/**
* @param {string} expression
* @return {!Promise<!Array<!Puppeteer.ElementHandle>>}
*/
async $x(expression) {
const document = await this._document();
const value = await document.$x(expression);
return value;
}
/**
* @param {string} selector
* @param {Function|string} pageFunction
* @param {!Array<*>} args
* @return {!Promise<(!Object|undefined)>}
*/
async $eval(selector, pageFunction, ...args) {
const document = await this._document();
return document.$eval(selector, pageFunction, ...args);
}
/**
* @param {string} selector
* @param {Function|string} pageFunction
* @param {!Array<*>} args
* @return {!Promise<(!Object|undefined)>}
*/
async $$eval(selector, pageFunction, ...args) {
const document = await this._document();
const value = await document.$$eval(selector, pageFunction, ...args);
return value;
}
/**
* @param {string} selector
* @return {!Promise<!Array<!Puppeteer.ElementHandle>>}
*/
async $$(selector) {
const document = await this._document();
const value = await document.$$(selector);
return value;
}
/**
* @return {!Promise<String>}
*/
async content() {
return await this.evaluate(() => {
let retVal = '';
if (document.doctype)
retVal = new XMLSerializer().serializeToString(document.doctype);
if (document.documentElement)
retVal += document.documentElement.outerHTML;
return retVal;
});
}
/**
* @param {string} html
* @param {!{timeout?: number, waitUntil?: string|!Array<string>}=} options
*/
async setContent(html, options = {}) {
const {
waitUntil = ['load'],
timeout = this._timeoutSettings.navigationTimeout(),
} = options;
// We rely upon the fact that document.open() will reset frame lifecycle with "init"
// lifecycle event. @see https://crrev.com/608658
await this.evaluate(html => {
document.open();
document.write(html);
document.close();
}, html);
const watcher = new LifecycleWatcher(this._frameManager, this._frame, waitUntil, timeout);
const error = await Promise.race([
watcher.timeoutOrTerminationPromise(),
watcher.lifecyclePromise(),
]);
watcher.dispose();
if (error)
throw error;
}
/**
* @param {!{url?: string, path?: string, content?: string, type?: string}} options
* @return {!Promise<!Puppeteer.ElementHandle>}
*/
async addScriptTag(options) {
const {
url = null,
path = null,
content = null,
type = ''
} = options;
if (url !== null) {
try {
const context = await this.executionContext();
return (await context.evaluateHandle(addScriptUrl, url, type)).asElement();
} catch (error) {
throw new Error(`Loading script from ${url} failed`);
}
}
if (path !== null) {
let contents = await readFileAsync(path, 'utf8');
contents += '//# sourceURL=' + path.replace(/\n/g, '');
const context = await this.executionContext();
return (await context.evaluateHandle(addScriptContent, contents, type)).asElement();
}
if (content !== null) {
const context = await this.executionContext();
return (await context.evaluateHandle(addScriptContent, content, type)).asElement();
}
throw new Error('Provide an object with a `url`, `path` or `content` property');
/**
* @param {string} url
* @param {string} type
* @return {!Promise<!HTMLElement>}
*/
async function addScriptUrl(url, type) {
const script = document.createElement('script');
script.src = url;
if (type)
script.type = type;
const promise = new Promise((res, rej) => {
script.onload = res;
script.onerror = rej;
});
document.head.appendChild(script);
await promise;
return script;
}
/**
* @param {string} content
* @param {string} type
* @return {!HTMLElement}
*/
function addScriptContent(content, type = 'text/javascript') {
const script = document.createElement('script');
script.type = type;
script.text = content;
let error = null;
script.onerror = e => error = e;
document.head.appendChild(script);
if (error)
throw error;
return script;
}
}
/**
* @param {!{url?: string, path?: string, content?: string}} options
* @return {!Promise<!Puppeteer.ElementHandle>}
*/
async addStyleTag(options) {
const {
url = null,
path = null,
content = null
} = options;
if (url !== null) {
try {
const context = await this.executionContext();
return (await context.evaluateHandle(addStyleUrl, url)).asElement();
} catch (error) {
throw new Error(`Loading style from ${url} failed`);
}
}
if (path !== null) {
let contents = await readFileAsync(path, 'utf8');
contents += '/*# sourceURL=' + path.replace(/\n/g, '') + '*/';
const context = await this.executionContext();
return (await context.evaluateHandle(addStyleContent, contents)).asElement();
}
if (content !== null) {
const context = await this.executionContext();
return (await context.evaluateHandle(addStyleContent, content)).asElement();
}
throw new Error('Provide an object with a `url`, `path` or `content` property');
/**
* @param {string} url
* @return {!Promise<!HTMLElement>}
*/
async function addStyleUrl(url) {
const link = document.createElement('link');
link.rel = 'stylesheet';
link.href = url;
const promise = new Promise((res, rej) => {
link.onload = res;
link.onerror = rej;
});
document.head.appendChild(link);
await promise;
return link;
}
/**
* @param {string} content
* @return {!Promise<!HTMLElement>}
*/
async function addStyleContent(content) {
const style = document.createElement('style');
style.type = 'text/css';
style.appendChild(document.createTextNode(content));
const promise = new Promise((res, rej) => {
style.onload = res;
style.onerror = rej;
});
document.head.appendChild(style);
await promise;
return style;
}
}
/**
* @param {string} selector
* @param {!{delay?: number, button?: "left"|"right"|"middle", clickCount?: number}=} options
*/
async click(selector, options) {
const handle = await this.$(selector);
assert(handle, 'No node found for selector: ' + selector);
await handle.click(options);
await handle.dispose();
}
/**
* @param {string} selector
*/
async focus(selector) {
const handle = await this.$(selector);
assert(handle, 'No node found for selector: ' + selector);
await handle.focus();
await handle.dispose();
}
/**
* @param {string} selector
*/
async hover(selector) {
const handle = await this.$(selector);
assert(handle, 'No node found for selector: ' + selector);
await handle.hover();
await handle.dispose();
}
/**
* @param {string} selector
* @param {!Array<string>} values
* @return {!Promise<!Array<string>>}
*/
select(selector, ...values){
for (const value of values)
assert(helper.isString(value), 'Values must be strings. Found value "' + value + '" of type "' + (typeof value) + '"');
return this.$eval(selector, (element, values) => {
if (element.nodeName.toLowerCase() !== 'select')
throw new Error('Element is not a <select> element.');
const options = Array.from(element.options);
element.value = undefined;
for (const option of options) {
option.selected = values.includes(option.value);
if (option.selected && !element.multiple)
break;
}
element.dispatchEvent(new Event('input', { 'bubbles': true }));
element.dispatchEvent(new Event('change', { 'bubbles': true }));
return options.filter(option => option.selected).map(option => option.value);
}, values);
}
/**
* @param {string} selector
*/
async tap(selector) {
const handle = await this.$(selector);
assert(handle, 'No node found for selector: ' + selector);
await handle.tap();
await handle.dispose();
}
/**
* @param {string} selector
* @param {string} text
* @param {{delay: (number|undefined)}=} options
*/
async type(selector, text, options) {
const handle = await this.$(selector);
assert(handle, 'No node found for selector: ' + selector);
await handle.type(text, options);
await handle.dispose();
}
/**
* @param {string} selector
* @param {!{visible?: boolean, hidden?: boolean, timeout?: number}=} options
* @return {!Promise<?Puppeteer.ElementHandle>}
*/
waitForSelector(selector, options) {
return this._waitForSelectorOrXPath(selector, false, options);
}
/**
* @param {string} xpath
* @param {!{visible?: boolean, hidden?: boolean, timeout?: number}=} options
* @return {!Promise<?Puppeteer.ElementHandle>}
*/
waitForXPath(xpath, options) {
return this._waitForSelectorOrXPath(xpath, true, options);
}
/**
* @param {Function|string} pageFunction
* @param {!{polling?: string|number, timeout?: number}=} options
* @return {!Promise<!Puppeteer.JSHandle>}
*/
waitForFunction(pageFunction, options = {}, ...args) {
const {
polling = 'raf',
timeout = this._timeoutSettings.timeout(),
} = options;
return new WaitTask(this, pageFunction, 'function', polling, timeout, ...args).promise;
}
/**
* @return {!Promise<string>}
*/
async title() {
return this.evaluate(() => document.title);
}
/**
* @param {string} selectorOrXPath
* @param {boolean} isXPath
* @param {!{visible?: boolean, hidden?: boolean, timeout?: number}=} options
* @return {!Promise<?Puppeteer.ElementHandle>}
*/
async _waitForSelectorOrXPath(selectorOrXPath, isXPath, options = {}) {
const {
visible: waitForVisible = false,
hidden: waitForHidden = false,
timeout = this._timeoutSettings.timeout(),
} = options;
const polling = waitForVisible || waitForHidden ? 'raf' : 'mutation';
const title = `${isXPath ? 'XPath' : 'selector'} "${selectorOrXPath}"${waitForHidden ? ' to be hidden' : ''}`;
const waitTask = new WaitTask(this, predicate, title, polling, timeout, selectorOrXPath, isXPath, waitForVisible, waitForHidden);
const handle = await waitTask.promise;
if (!handle.asElement()) {
await handle.dispose();
return null;
}
return handle.asElement();
/**
* @param {string} selectorOrXPath
* @param {boolean} isXPath
* @param {boolean} waitForVisible
* @param {boolean} waitForHidden
* @return {?Node|boolean}
*/
function predicate(selectorOrXPath, isXPath, waitForVisible, waitForHidden) {
const node = isXPath
? document.evaluate(selectorOrXPath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue
: document.querySelector(selectorOrXPath);
if (!node)
return waitForHidden;
if (!waitForVisible && !waitForHidden)
return node;
const element = /** @type {Element} */ (node.nodeType === Node.TEXT_NODE ? node.parentElement : node);
const style = window.getComputedStyle(element);
const isVisible = style && style.visibility !== 'hidden' && hasVisibleBoundingBox();
const success = (waitForVisible === isVisible || waitForHidden === !isVisible);
return success ? node : null;
/**
* @return {boolean}
*/
function hasVisibleBoundingBox() {
const rect = element.getBoundingClientRect();
return !!(rect.top || rect.bottom || rect.width || rect.height);
}
}
}
}
class WaitTask {
/**
* @param {!DOMWorld} domWorld
* @param {Function|string} predicateBody
* @param {string|number} polling
* @param {number} timeout
* @param {!Array<*>} args
*/
constructor(domWorld, predicateBody, title, polling, timeout, ...args) {
if (helper.isString(polling))
assert(polling === 'raf' || polling === 'mutation', 'Unknown polling option: ' + polling);
else if (helper.isNumber(polling))
assert(polling > 0, 'Cannot poll with non-positive interval: ' + polling);
else
throw new Error('Unknown polling options: ' + polling);
this._domWorld = domWorld;
this._polling = polling;
this._timeout = timeout;
this._predicateBody = helper.isString(predicateBody) ? 'return (' + predicateBody + ')' : 'return (' + predicateBody + ')(...args)';
this._args = args;
this._runCount = 0;
domWorld._waitTasks.add(this);
this.promise = new Promise((resolve, reject) => {
this._resolve = resolve;
this._reject = reject;
});
// Since page navigation requires us to re-install the pageScript, we should track
// timeout on our end.
if (timeout) {
const timeoutError = new TimeoutError(`waiting for ${title} failed: timeout ${timeout}ms exceeded`);
this._timeoutTimer = setTimeout(() => this.terminate(timeoutError), timeout);
}
this.rerun();
}
/**
* @param {!Error} error
*/
terminate(error) {
this._terminated = true;
this._reject(error);
this._cleanup();
}
async rerun() {
const runCount = ++this._runCount;
/** @type {?Puppeteer.JSHandle} */
let success = null;
let error = null;
try {
success = await (await this._domWorld.executionContext()).evaluateHandle(waitForPredicatePageFunction, this._predicateBody, this._polling, this._timeout, ...this._args);
} catch (e) {
error = e;
}
if (this._terminated || runCount !== this._runCount) {
if (success)
await success.dispose();
return;
}
// Ignore timeouts in pageScript - we track timeouts ourselves.
// If the frame's execution context has already changed, `frame.evaluate` will
// throw an error - ignore this predicate run altogether.
if (!error && await this._domWorld.evaluate(s => !s, success).catch(e => true)) {
await success.dispose();
return;
}
// When the page is navigated, the promise is rejected.
// We will try again in the new execution context.
if (error && error.message.includes('Execution context was destroyed'))
return;
// We could have tried to evaluate in a context which was already
// destroyed.
if (error && error.message.includes('Cannot find context with specified id'))
return;
if (error)
this._reject(error);
else
this._resolve(success);
this._cleanup();
}
_cleanup() {
clearTimeout(this._timeoutTimer);
this._domWorld._waitTasks.delete(this);
this._runningTask = null;
}
}
/**
* @param {string} predicateBody
* @param {string} polling
* @param {number} timeout
* @return {!Promise<*>}
*/
async function waitForPredicatePageFunction(predicateBody, polling, timeout, ...args) {
const predicate = new Function('...args', predicateBody);
let timedOut = false;
if (timeout)
setTimeout(() => timedOut = true, timeout);
if (polling === 'raf')
return await pollRaf();
if (polling === 'mutation')
return await pollMutation();
if (typeof polling === 'number')
return await pollInterval(polling);
/**
* @return {!Promise<*>}
*/
function pollMutation() {
const success = predicate.apply(null, args);
if (success)
return Promise.resolve(success);
let fulfill;
const result = new Promise(x => fulfill = x);
const observer = new MutationObserver(mutations => {
if (timedOut) {
observer.disconnect();
fulfill();
}
const success = predicate.apply(null, args);
if (success) {
observer.disconnect();
fulfill(success);
}
});
observer.observe(document, {
childList: true,
subtree: true,
attributes: true
});
return result;
}
/**
* @return {!Promise<*>}
*/
function pollRaf() {
let fulfill;
const result = new Promise(x => fulfill = x);
onRaf();
return result;
function onRaf() {
if (timedOut) {
fulfill();
return;
}
const success = predicate.apply(null, args);
if (success)
fulfill(success);
else
requestAnimationFrame(onRaf);
}
}
/**
* @param {number} pollInterval
* @return {!Promise<*>}
*/
function pollInterval(pollInterval) {
let fulfill;
const result = new Promise(x => fulfill = x);
onTimeout();
return result;
function onTimeout() {
if (timedOut) {
fulfill();
return;
}
const success = predicate.apply(null, args);
if (success)
fulfill(success);
else
setTimeout(onTimeout, pollInterval);
}
}
}
module.exports = {DOMWorld};