puppeteer/lib/NavigatorWatcher.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.
*/
const {helper} = require('./helper');
const {FrameManager} = require('./FrameManager');
class NavigatorWatcher {
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/**
* @param {!FrameManager} frameManager
* @param {!Puppeteer.Frame} frame
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* @param {!Object=} options
*/
constructor(frameManager, frame, options = {}) {
console.assert(options.networkIdleTimeout === undefined, 'ERROR: networkIdleTimeout option is no longer supported.');
console.assert(options.networkIdleInflight === undefined, 'ERROR: networkIdleInflight option is no longer supported.');
console.assert(options.waitUntil !== 'networkidle', 'ERROR: "networkidle" option is no longer supported. Use "networkidle2" instead');
let waitUntil = ['load'];
if (Array.isArray(options.waitUntil))
waitUntil = options.waitUntil.slice();
else if (typeof options.waitUntil === 'string')
waitUntil = [options.waitUntil];
this._expectedLifecycle = waitUntil.map(value => {
const protocolEvent = puppeteerToProtocolLifecycle[value];
console.assert(protocolEvent, 'Unknown value for options.waitUntil: ' + value);
return protocolEvent;
});
this._frameManager = frameManager;
this._frame = frame;
this._initialLoaderId = frame._loaderId;
this._timeout = typeof options.timeout === 'number' ? options.timeout : 30000;
this._eventListeners = [
helper.addEventListener(this._frameManager, FrameManager.Events.LifecycleEvent, this._checkLifecycleComplete.bind(this)),
helper.addEventListener(this._frameManager, FrameManager.Events.FrameDetached, this._checkLifecycleComplete.bind(this))
];
const lifecycleCompletePromise = new Promise(fulfill => {
this._lifecycleCompleteCallback = fulfill;
});
this._navigationPromise = Promise.race([
this._createTimeoutPromise(),
lifecycleCompletePromise
]).then(error => {
this._cleanup();
return error;
});
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}
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/**
* @return {?Promise<?Error>}
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*/
_createTimeoutPromise() {
if (!this._timeout)
return new Promise(() => {});
const errorMessage = 'Navigation Timeout Exceeded: ' + this._timeout + 'ms exceeded';
return new Promise(fulfill => this._maximumTimer = setTimeout(fulfill, this._timeout))
.then(() => new Error(errorMessage));
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}
/**
* @return {!Promise<?Error>}
*/
async navigationPromise() {
return this._navigationPromise;
}
_checkLifecycleComplete() {
// We expect navigation to commit.
if (this._frame._loaderId === this._initialLoaderId)
return;
if (!checkLifecycle(this._frame, this._expectedLifecycle))
return;
this._lifecycleCompleteCallback();
/**
* @param {!Puppeteer.Frame} frame
* @param {!Array<string>} expectedLifecycle
* @return {boolean}
*/
function checkLifecycle(frame, expectedLifecycle) {
for (const event of expectedLifecycle) {
if (!frame._lifecycleEvents.has(event))
return false;
}
for (const child of frame.childFrames()) {
if (!checkLifecycle(child, expectedLifecycle))
return false;
}
return true;
}
}
cancel() {
this._cleanup();
}
_cleanup() {
helper.removeEventListeners(this._eventListeners);
this._lifecycleCompleteCallback(new Error('Navigation failed'));
clearTimeout(this._maximumTimer);
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}
}
const puppeteerToProtocolLifecycle = {
'load': 'load',
'domcontentloaded': 'DOMContentLoaded',
'networkidle0': 'networkIdle',
'networkidle2': 'networkAlmostIdle',
};
module.exports = NavigatorWatcher;