f7cd0048af
This patch cleans up navigator logic. (This is a result of a pair programming with @pavelfeldman).
110 lines
4.1 KiB
JavaScript
110 lines
4.1 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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class Navigator {
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/**
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* @param {!Connection} client
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* @param {string} url
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* @param {string=} referrer
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* @param {!Object=} options
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*/
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constructor(client, url, referrer, options = {}) {
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this._client = client;
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this._url = url;
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this._referrer = referrer;
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this._maxTime = typeof options['maxTime'] === 'number' ? options['maxTime'] : 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._waitFor = typeof options['waitFor'] === 'string' ? options['waitFor'] : 'load';
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console.assert(this._waitFor === 'load' || this._waitFor === 'networkidle', 'Unknown value for options.waitFor: ' + this._waitFor);
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}
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/**
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* @return {!Promise<boolean>}
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*/
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async navigate() {
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this._init();
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let certificateError = new Promise(fulfill => this._client.once('Security.certificateError', fulfill)).then(() => false);
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let networkIdle = new Promise(fulfill => this._networkIdleCallback = fulfill).then(() => true);
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let loadEventFired = new Promise(fulfill => this._client.once('Page.loadEventFired', fulfill)).then(() => true);
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let watchdog = new Promise(fulfill => setTimeout(fulfill, this._maxTime)).then(() => false);
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// Await for the command to throw exception in case of illegal arguments.
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try {
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await this._client.send('Page.navigate', {url: this._url, referrer: this._referrer});
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} catch (e) {
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this._cleanup();
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return false;
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}
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let result = await Promise.race([certificateError, watchdog, this._waitFor === 'load' ? loadEventFired : networkIdle]);
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this._cleanup();
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return result;
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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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this._loadingStartedHandler = this._onLoadingStarted.bind(this);
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this._loadingCompletedHandler = this._onLoadingCompleted.bind(this);
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this._client.on('Network.requestWillBeSent', this._loadingStartedHandler);
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this._client.on('Network.loadingFinished', this._loadingCompletedHandler);
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this._client.on('Network.loadingFailed', this._loadingCompletedHandler);
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this._client.on('Network.webSocketCreated', this._loadingStartedHandler);
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this._client.on('Network.webSocketClosed', this._loadingCompletedHandler);
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this._inflightRequests = 0;
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this._requestIds = new Set();
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}
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_cleanup() {
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this._client.removeListener('Network.requestWillBeSent', this._loadingStartedHandler);
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this._client.removeListener('Network.loadingFinished', this._loadingCompletedHandler);
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this._client.removeListener('Network.loadingFailed', this._loadingCompletedHandler);
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this._client.removeListener('Network.webSocketCreated', this._loadingStartedHandler);
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this._client.removeListener('Network.webSocketClosed', this._loadingCompletedHandler);
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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 = Navigator;
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