puppeteer/lib/FrameManager.js

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/**
* Copyright 2017 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.
*/
let EventEmitter = require('events');
let helper = require('./helper');
class FrameManager extends EventEmitter {
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/**
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* @param {!Connection} client
* @return {!Promise<!FrameManager>}
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*/
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static async create(client) {
let mainFramePayload = await client.send('Page.getResourceTree');
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return new FrameManager(client, mainFramePayload.frameTree);
}
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/**
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* @param {!Connection} client
* @param {!Object} frameTree
*/
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constructor(client, frameTree) {
super();
this._client = client;
/** @type {!Map<string, !Frame>} */
this._frames = new Map();
this._mainFrame = this._addFramesRecursively(null, frameTree);
/** @type {!Map<string, string>} */
this._frameIdToExecutionContextId = new Map();
this._client.on('Page.frameAttached', event => this._onFrameAttached(event.frameId, event.parentFrameId));
this._client.on('Page.frameNavigated', event => this._onFrameNavigated(event.frame));
this._client.on('Page.frameDetached', event => this._onFrameDetached(event.frameId));
this._client.on('Runtime.executionContextCreated', event => this._onExecutionContextCreated(event.context));
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}
/**
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* @return {!Frame}
*/
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mainFrame() {
return this._mainFrame;
}
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/**
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* @return {!Array<!Frame>}
*/
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frames() {
return Array.from(this._frames.values());
}
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/**
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* @param {string} frameId
* @param {?string} parentFrameId
* @return {?Frame}
*/
_onFrameAttached(frameId, parentFrameId) {
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if (this._frames.has(frameId))
return;
if (!parentFrameId) {
// Navigation to the new backend process.
this._navigateFrame(this._mainFrame, frameId, null);
return;
}
let parentFrame = this._frames.get(parentFrameId);
let frame = new Frame(this, parentFrame, frameId, null);
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this._frames.set(frame._id, frame);
this.emit(FrameManager.Events.FrameAttached, frame);
}
/**
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* @param {!Object} framePayload
*/
_onFrameNavigated(framePayload) {
let frame = this._frames.get(framePayload.id);
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if (!frame) {
// Simulate missed "frameAttached" for a main frame navigation to the new backend process.
console.assert(!framePayload.parentId, 'Main frame shouldn\'t have parent frame id.');
frame = this._mainFrame;
}
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this._navigateFrame(frame, framePayload.id, framePayload);
}
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/**
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* @param {string} frameId
*/
_onFrameDetached(frameId) {
let frame = this._frames.get(frameId);
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if (frame)
this._removeFramesRecursively(frame);
}
_onExecutionContextCreated(context) {
if (context.auxData && context.auxData.isDefault && context.auxData.frameId)
this._frameIdToExecutionContextId.set(context.auxData.frameId, context.id);
}
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/**
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* @param {!Frame} frame
* @param {string} newFrameId
* @param {?Object} newFramePayload
*/
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_navigateFrame(frame, newFrameId, newFramePayload) {
// Detach all child frames first.
for (let child of frame.childFrames())
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this._removeFramesRecursively(child);
this._frames.delete(frame._id, frame);
this._frameIdToExecutionContextId.delete(frame._id);
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frame._id = newFrameId;
frame._adoptPayload(newFramePayload);
this._frames.set(newFrameId, frame);
this.emit(FrameManager.Events.FrameNavigated, frame);
}
/**
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* @param {?Frame} parentFrame
* @param {!Object} frameTreePayload
* @return {!Frame}
*/
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_addFramesRecursively(parentFrame, frameTreePayload) {
let framePayload = frameTreePayload.frame;
let frame = new Frame(this, parentFrame, framePayload.id, framePayload);
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this._frames.set(frame._id, frame);
for (let i = 0; frameTreePayload.childFrames && i < frameTreePayload.childFrames.length; ++i)
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this._addFramesRecursively(frame, frameTreePayload.childFrames[i]);
return frame;
}
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/**
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* @param {!Frame} frame
*/
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_removeFramesRecursively(frame) {
for (let child of frame.childFrames())
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this._removeFramesRecursively(child);
frame._detach();
this._frames.delete(frame._id);
this._frameIdToExecutionContextId.delete(frame._id);
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this.emit(FrameManager.Events.FrameDetached, frame);
}
/**
* @param {!Frame} frame
* @param {string} expression
* @return {!Promise<(!Object|undefined)>}
*/
async _evaluateOnFrame(frame, expression) {
let contextId = undefined;
if (!frame.isMainFrame()) {
contextId = this._frameIdToExecutionContextId.get(frame._id);
console.assert(contextId, 'Frame does not have default context to evaluate in!');
}
expression = `Promise.resolve(${expression})`;
let { exceptionDetails, result: remoteObject } = await this._client.send('Runtime.evaluate', { expression, contextId, returnByValue: false, awaitPromise: true });
if (exceptionDetails) {
let message = await helper.getExceptionMessage(this._client, exceptionDetails);
throw new Error('Evaluation failed: ' + message);
}
return await helper.serializeRemoteObject(this._client, remoteObject);
}
/**
* @param {string} selector
* @param {!Frame} frame
* @return {!Promise<undefined>}
*/
async _waitForSelector(selector, frame) {
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function code(selector) {
if (document.querySelector(selector))
return Promise.resolve();
let callback;
const result = new Promise(fulfill => callback = fulfill);
const mo = new MutationObserver((mutations, observer) => {
if (document.querySelector(selector)) {
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observer.disconnect();
callback();
return;
}
});
mo.observe(document, {
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childList: true,
subtree: true
});
return result;
}
let contextId = undefined;
if (!frame.isMainFrame()) {
contextId = this._frameIdToExecutionContextId.get(frame._id);
console.assert(contextId, 'Frame does not have default context to evaluate in!');
}
let { exceptionDetails } = await this._client.send('Runtime.evaluate', {
expression: helper.evaluationString(code, selector),
contextId,
awaitPromise: true,
returnByValue: false,
});
if (exceptionDetails) {
let message = await helper.getExceptionMessage(this._client, exceptionDetails);
throw new Error('Evaluation failed: ' + message);
}
}
}
/** @enum {string} */
FrameManager.Events = {
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FrameAttached: 'frameattached',
FrameNavigated: 'framenavigated',
FrameDetached: 'framedetached'
};
/**
* @unrestricted
*/
class Frame {
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/**
* @param {!FrameManager} frameManager
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* @param {?Frame} parentFrame
* @param {string} frameId
* @param {?Object} payload
*/
constructor(frameManager, parentFrame, frameId, payload) {
this._frameManager = frameManager;
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this._parentFrame = parentFrame;
this._url = '';
this._id = frameId;
/** @type {!Set<!AwaitedElement>} */
this._awaitedElements = new Set();
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this._adoptPayload(payload);
/** @type {!Set<!Frame>} */
this._childFrames = new Set();
if (this._parentFrame)
this._parentFrame._childFrames.add(this);
}
/**
* @param {function()} pageFunction
* @param {!Array<*>} args
* @return {!Promise<(!Object|undefined)>}
*/
async evaluate(pageFunction, ...args) {
return this._frameManager._evaluateOnFrame(this, helper.evaluationString(pageFunction, ...args));
}
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/**
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* @return {string}
*/
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name() {
return this._name || '';
}
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/**
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* @return {string}
*/
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url() {
return this._url;
}
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/**
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* @return {?Frame}
*/
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parentFrame() {
return this._parentFrame;
}
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/**
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* @return {!Array.<!Frame>}
*/
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childFrames() {
return Array.from(this._childFrames);
}
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/**
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* @return {boolean}
*/
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isMainFrame() {
return !this._detached && !this._parentFrame;
}
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/**
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* @return {boolean}
*/
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isDetached() {
return this._detached;
}
/**
* @param {string} selector
* @return {!Promise}
*/
async waitFor(selector) {
const awaitedElement = new AwaitedElement(() => this._frameManager._waitForSelector(selector, this));
this._awaitedElements.add(awaitedElement);
let cleanup = () => this._awaitedElements.delete(awaitedElement);
awaitedElement.promise.then(cleanup, cleanup);
return awaitedElement.promise;
}
/**
* @param {string} selector
* @param {function(!Element):T} pageFunction
* @param {!Array<*>} args
* @return {!Promise<?T>}
*/
async $(selector, pageFunction, ...args) {
let argsString = ['node'].concat(args.map(x => JSON.stringify(x))).join(',');
let expression = `(()=>{
let node = document.querySelector(${JSON.stringify(selector)});
if (!node)
return null;
return (${pageFunction})(${argsString});
})()`;
return this._frameManager._evaluateOnFrame(this, expression);
}
/**
* @param {string} selector
* @param {function(!Element):T} pageFunction
* @param {!Array<*>} args
* @return {!Promise<!Array<T>>}
*/
async $$(selector, pageFunction, ...args) {
let argsString = ['node, index'].concat(args.map(x => JSON.stringify(x))).join(',');
let expression = `(()=>{
let nodes = document.querySelectorAll(${JSON.stringify(selector)});
return Array.prototype.map.call(nodes, (node, index) => (${pageFunction})(${argsString}));
})()`;
return this._frameManager._evaluateOnFrame(this, expression);
}
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/**
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* @param {?Object} framePayload
*/
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_adoptPayload(framePayload) {
framePayload = framePayload || {
name: '',
url: '',
};
this._name = framePayload.name;
this._url = framePayload.url;
for (let awaitedElement of this._awaitedElements)
awaitedElement.startWaiting();
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}
_detach() {
for (let awaitedElement of this._awaitedElements)
awaitedElement.terminate(new Error('waitForSelector failed: frame got detached.'));
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this._detached = true;
if (this._parentFrame)
this._parentFrame._childFrames.delete(this);
this._parentFrame = null;
}
}
helper.tracePublicAPI(Frame);
class AwaitedElement {
/**
* @param {function():!Promise} waitInPageCallback
*/
constructor(waitInPageCallback) {
this.promise = new Promise((resolve, reject) => {
this._resolve = resolve;
this._reject = reject;
});
this._waitInPageCallback = waitInPageCallback;
this._waitPromise = null;
this.startWaiting();
}
/**
* @param {!Error} error
*/
terminate(error) {
this._reject(error);
this._waitTaskPromise = null;
}
startWaiting() {
let waitPromise = this._waitInPageCallback.call(null).then(finish.bind(this), finish.bind(this));
this._waitPromise = waitPromise;
/**
* @param {?Error} error
*/
function finish(error) {
if (this._waitPromise !== waitPromise)
return;
if (error)
this._reject(error);
else
this._resolve();
}
}
}
module.exports = FrameManager;