112 lines
3.9 KiB
JavaScript
112 lines
3.9 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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const helper = require('./helper');
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class NavigatorWatcher {
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/**
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* @param {!Connection} client
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* @param {!Object=} options
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*/
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constructor(client, options = {}) {
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this._client = client;
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this._timeout = typeof options['timeout'] === 'number' ? options['timeout'] : 30000;
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this._idleTime = typeof options['networkIdleTimeout'] === 'number' ? options['networkIdleTimeout'] : 1000;
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this._idleInflight = typeof options['networkIdleInflight'] === 'number' ? options['networkIdleInflight'] : 2;
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this._waitUntil = typeof options['waitUntil'] === 'string' ? options['waitUntil'] : 'load';
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console.assert(this._waitUntil === 'load' || this._waitUntil === 'networkidle', 'Unknown value for options.waitUntil: ' + this._waitUntil);
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}
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/**
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* @return {!Promise<!Map<string, !Response>>}
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*/
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async waitForNavigation() {
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this._inflightRequests = 0;
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this._requestIds = new Set();
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this._eventListeners = [
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helper.addEventListener(this._client, 'Network.requestWillBeSent', this._onLoadingStarted.bind(this)),
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helper.addEventListener(this._client, 'Network.loadingFinished', this._onLoadingCompleted.bind(this)),
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helper.addEventListener(this._client, 'Network.loadingFailed', this._onLoadingCompleted.bind(this)),
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helper.addEventListener(this._client, 'Network.webSocketCreated', this._onLoadingStarted.bind(this)),
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helper.addEventListener(this._client, 'Network.webSocketClosed', this._onLoadingCompleted.bind(this)),
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];
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let certificateError = new Promise(fulfill => {
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this._eventListeners.push(helper.addEventListener(this._client, 'Security.certificateError', fulfill));
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}).then(error => 'SSL Certificate error: ' + error.errorType);
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let networkIdle = new Promise(fulfill => this._networkIdleCallback = fulfill).then(() => null);
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let loadEventFired = new Promise(fulfill => {
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this._eventListeners.push(helper.addEventListener(this._client, 'Page.loadEventFired', fulfill));
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}).then(() => null);
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let watchdog = new Promise(fulfill => this._maximumTimer = setTimeout(fulfill, this._timeout))
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.then(() => 'Navigation Timeout Exceeded: ' + this._timeout + 'ms exceeded');
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try {
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// Await for the command to throw exception in case of illegal arguments.
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const error = await Promise.race([certificateError, watchdog, this._waitUntil === 'load' ? loadEventFired : networkIdle]);
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if (error)
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throw new Error(error);
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} finally {
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this._cleanup();
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}
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}
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cancel() {
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this._cleanup();
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}
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/**
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* @param {!Object} event
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*/
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_onLoadingStarted(event) {
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this._requestIds.add(event.requestId);
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if (!event.redirectResponse)
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++this._inflightRequests;
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if (this._inflightRequests > this._idleInflight) {
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clearTimeout(this._idleTimer);
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this._idleTimer = null;
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}
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}
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/**
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* @param {!Object} event
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*/
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_onLoadingCompleted(event) {
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if (!this._requestIds.has(event.requestId))
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return;
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--this._inflightRequests;
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if (this._inflightRequests <= this._idleInflight && !this._idleTimer)
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this._idleTimer = setTimeout(this._networkIdleCallback, this._idleTime);
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}
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_init() {
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}
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_cleanup() {
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helper.removeEventListeners(this._eventListeners);
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clearTimeout(this._idleTimer);
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clearTimeout(this._maximumTimer);
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}
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}
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module.exports = NavigatorWatcher;
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