puppeteer/lib/Worker.js
2018-08-06 11:31:33 -07:00

81 lines
2.8 KiB
JavaScript

/**
* Copyright 2018 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 EventEmitter = require('events');
const {helper, debugError} = require('./helper');
const {ExecutionContext, JSHandle} = require('./ExecutionContext');
class Worker extends EventEmitter {
/**
* @param {Puppeteer.CDPSession} client
* @param {string} url
* @param {function(!string, !Array<!JSHandle>)} consoleAPICalled
* @param {function(!Protocol.Runtime.ExceptionDetails)} exceptionThrown
*/
constructor(client, url, consoleAPICalled, exceptionThrown) {
super();
this._client = client;
this._url = url;
this._executionContextPromise = new Promise(x => this._executionContextCallback = x);
/** @type {function(!Protocol.Runtime.RemoteObject):!JSHandle} */
let jsHandleFactory;
this._client.once('Runtime.executionContextCreated', async event => {
jsHandleFactory = remoteObject => new JSHandle(executionContext, client, remoteObject);
const executionContext = new ExecutionContext(client, event.context, jsHandleFactory, null);
this._executionContextCallback(executionContext);
});
// This might fail if the target is closed before we recieve all execution contexts.
this._client.send('Runtime.enable', {}).catch(debugError);
this._client.on('Runtime.consoleAPICalled', event => consoleAPICalled(event.type, event.args.map(jsHandleFactory)));
this._client.on('Runtime.exceptionThrown', exception => exceptionThrown(exception.exceptionDetails));
}
/**
* @return {string}
*/
url() {
return this._url;
}
/**
* @return {!Promise<ExecutionContext>}
*/
async executionContext() {
return this._executionContextPromise;
}
/**
* @param {function()|string} pageFunction
* @param {!Array<*>} args
* @return {!Promise<*>}
*/
async evaluate(pageFunction, ...args) {
return (await this._executionContextPromise).evaluate(pageFunction, ...args);
}
/**
* @param {function()|string} pageFunction
* @param {!Array<*>} args
* @return {!Promise<!JSHandle>}
*/
async evaluateHandle(pageFunction, ...args) {
return (await this._executionContextPromise).evaluateHandle(pageFunction, ...args);
}
}
module.exports = {Worker};
helper.tracePublicAPI(Worker);