356 lines
9.5 KiB
JavaScript
356 lines
9.5 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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let EventEmitter = require('events');
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let helper = require('./helper');
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class FrameManager extends EventEmitter {
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/**
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* @param {!Connection} client
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* @return {!Promise<!FrameManager>}
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*/
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static async create(client) {
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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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/**
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* @param {!Connection} client
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* @param {!Object} frameTree
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*/
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constructor(client, frameTree) {
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super();
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this._client = client;
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/** @type {!Map<string, !Frame>} */
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this._frames = new Map();
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this._mainFrame = this._addFramesRecursively(null, frameTree);
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/** @type {!Map<string, string>} */
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this._frameIdToExecutionContextId = new Map();
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this._client.on('Page.frameAttached', event => this._onFrameAttached(event.frameId, event.parentFrameId));
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this._client.on('Page.frameNavigated', event => this._onFrameNavigated(event.frame));
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this._client.on('Page.frameDetached', event => this._onFrameDetached(event.frameId));
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this._client.on('Runtime.executionContextCreated', event => this._onExecutionContextCreated(event.context));
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this._client.on('Runtime.executionContextDestroyed', event => this._onExecutionContextDestroyed(event.executionContextId));
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}
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/**
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* @return {!Frame}
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*/
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mainFrame() {
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return this._mainFrame;
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}
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/**
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* @return {!Array<!Frame>}
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*/
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frames() {
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return Array.from(this._frames.values());
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}
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/**
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* @param {string} frameId
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* @param {?string} parentFrameId
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* @return {?Frame}
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*/
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_onFrameAttached(frameId, parentFrameId) {
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if (this._frames.has(frameId))
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return;
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if (!parentFrameId) {
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// Navigation to the new backend process.
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this._navigateFrame(this._mainFrame, frameId, null);
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return;
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}
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let parentFrame = this._frames.get(parentFrameId);
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let frame = new Frame(this, parentFrame, frameId, null);
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this._frames.set(frame._id, frame);
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this.emit(FrameManager.Events.FrameAttached, frame);
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}
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/**
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* @param {!Object} framePayload
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*/
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_onFrameNavigated(framePayload) {
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let frame = this._frames.get(framePayload.id);
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if (!frame) {
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// Simulate missed "frameAttached" for a main frame navigation to the new backend process.
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console.assert(!framePayload.parentId, 'Main frame shouldn\'t have parent frame id.');
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frame = this._mainFrame;
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}
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this._navigateFrame(frame, framePayload.id, framePayload);
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}
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/**
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* @param {string} frameId
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*/
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_onFrameDetached(frameId) {
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let frame = this._frames.get(frameId);
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if (frame)
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this._removeFramesRecursively(frame);
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}
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_onExecutionContextCreated(context) {
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if (context.auxData && context.auxData.isDefault && context.auxData.frameId)
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this._frameIdToExecutionContextId.set(context.auxData.frameId, context.id);
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}
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_onExecutionContextDestroyed(executionContextId) {
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this._frameIdToExecutionContextId.delete(executionContextId);
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}
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/**
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* @param {!Frame} frame
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* @param {string} newFrameId
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* @param {?Object} newFramePayload
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*/
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_navigateFrame(frame, newFrameId, newFramePayload) {
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// Detach all child frames first.
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for (let child of frame.childFrames())
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this._removeFramesRecursively(child);
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this._frames.delete(frame._id, frame);
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frame._id = newFrameId;
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frame._adoptPayload(newFramePayload);
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this._frames.set(newFrameId, frame);
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this.emit(FrameManager.Events.FrameNavigated, frame);
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}
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/**
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* @param {?Frame} parentFrame
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* @param {!Object} frameTreePayload
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* @return {!Frame}
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*/
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_addFramesRecursively(parentFrame, frameTreePayload) {
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let framePayload = frameTreePayload.frame;
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let frame = new Frame(this, parentFrame, framePayload.id, framePayload);
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this._frames.set(frame._id, frame);
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for (let i = 0; frameTreePayload.childFrames && i < frameTreePayload.childFrames.length; ++i)
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this._addFramesRecursively(frame, frameTreePayload.childFrames[i]);
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return frame;
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}
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/**
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* @param {!Frame} frame
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*/
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_removeFramesRecursively(frame) {
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for (let child of frame.childFrames())
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this._removeFramesRecursively(child);
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frame._detach();
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this._frames.delete(frame._id);
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this.emit(FrameManager.Events.FrameDetached, frame);
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}
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/**
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* @param {!Frame} frame
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* @param {function()} fun
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* @param {!Array<*>} args
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* @return {!Promise<(!Object|undefined)>}
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*/
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async _evaluateOnFrame(frame, fun, ...args) {
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let contextId = undefined;
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if (!frame.isMainFrame()) {
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contextId = this._frameIdToExecutionContextId.get(frame._id);
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console.assert(contextId, 'Frame does not have default context to evaluate in!');
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}
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let syncExpression = helper.evaluationString(fun, ...args);
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let expression = `Promise.resolve(${syncExpression})`;
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let { exceptionDetails, result: remoteObject } = await this._client.send('Runtime.evaluate', { expression, contextId, returnByValue: false, awaitPromise: true });
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if (exceptionDetails) {
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let message = await helper.getExceptionMessage(this._client, exceptionDetails);
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throw new Error('Evaluation failed: ' + message);
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}
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if (remoteObject.unserializableValue) {
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switch (remoteObject.unserializableValue) {
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case '-0':
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return -0;
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case 'NaN':
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return NaN;
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case 'Infinity':
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return Infinity;
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case '-Infinity':
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return -Infinity;
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default:
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throw new Error('Unsupported unserializable value: ' + remoteObject.unserializableValue);
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}
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}
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if (!remoteObject.objectId)
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return remoteObject.value;
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let response = await this._client.send('Runtime.callFunctionOn', {
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objectId: remoteObject.objectId,
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functionDeclaration: 'function() { return this; }',
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returnByValue: true,
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});
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return response.result.value;
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}
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/**
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* @param {string} selector
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* @param {!Frame} frame
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* @return {!Promise<undefined>}
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*/
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async _waitForInFrame(selector, frame) {
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let code = selector => new Promise((fulfill, reject) => {
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if (document.querySelector(selector)) {
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fulfill();
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return;
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}
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new MutationObserver((mutations, observer) => {
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for (let mutation of mutations) {
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for (let node of mutation.addedNodes) {
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if (node.matches(selector)) {
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observer.disconnect();
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fulfill();
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return;
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}
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}
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}
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}).observe(document.documentElement, {
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childList: true,
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subtree: true
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});
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});
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await this._client.send('Runtime.evaluate', {
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expression: helper.evaluationString(code, selector),
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awaitPromise: true,
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returnByValue: true,
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});
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}
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}
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/** @enum {string} */
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FrameManager.Events = {
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FrameAttached: 'frameattached',
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FrameNavigated: 'framenavigated',
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FrameDetached: 'framedetached'
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};
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/**
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* @unrestricted
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*/
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class Frame {
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/**
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* @param {!FrameManager} frameManager
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* @param {?Frame} parentFrame
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* @param {string} frameId
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* @param {?Object} payload
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*/
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constructor(frameManager, parentFrame, frameId, payload) {
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this._frameManager = frameManager;
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this._parentFrame = parentFrame;
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this._url = '';
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this._id = frameId;
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this._adoptPayload(payload);
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/** @type {!Set<!Frame>} */
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this._childFrames = new Set();
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if (this._parentFrame)
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this._parentFrame._childFrames.add(this);
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}
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/**
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* @param {function()} fun
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* @param {!Array<*>} args
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* @return {!Promise<(!Object|undefined)>}
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*/
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async evaluate(fun, ...args) {
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return this._frameManager._evaluateOnFrame(this, fun, ...args);
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}
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/**
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* @return {string}
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*/
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name() {
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return this._name || '';
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}
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/**
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* @return {string}
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*/
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url() {
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return this._url;
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}
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/**
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* @return {string}
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*/
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securityOrigin() {
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return this._securityOrigin;
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}
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/**
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* @return {?Frame}
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*/
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parentFrame() {
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return this._parentFrame;
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}
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/**
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* @return {!Array.<!Frame>}
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*/
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childFrames() {
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return Array.from(this._childFrames);
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}
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/**
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* @return {boolean}
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*/
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isMainFrame() {
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return !this._detached && !this._parentFrame;
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}
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/**
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* @return {boolean}
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*/
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isDetached() {
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return this._detached;
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}
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/**
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* @param {string} selector
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* @return {!Promise<undefined>}
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*/
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async waitFor(selector) {
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await this._frameManager._waitForInFrame(selector, this);
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}
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/**
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* @param {?Object} framePayload
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*/
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_adoptPayload(framePayload) {
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framePayload = framePayload || {
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name: '',
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url: '',
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securityOrigin: '',
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mimeType: ''
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};
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this._name = framePayload.name;
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this._url = framePayload.url;
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this._securityOrigin = framePayload.securityOrigin;
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this._mimeType = framePayload.mimeType;
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}
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_detach() {
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this._detached = true;
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if (this._parentFrame)
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this._parentFrame._childFrames.delete(this);
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this._parentFrame = null;
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}
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}
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module.exports = FrameManager;
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