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cri.js
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cri.js
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/**
* @license
* Copyright 2016 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.
*/
'use strict';
const Connection = require('./connection.js');
const WebSocket = require('ws');
const http = require('http');
const log = require('../../lib/log.js');
const hostname = 'localhost';
const CONNECT_TIMEOUT = 10000;
const DEFAULT_PORT = 9222;
class CriConnection extends Connection {
/**
* @param {number=} port Optional port number. Defaults to 9222;
* @constructor
*/
constructor(port) {
super();
this.port = port || DEFAULT_PORT;
}
/**
* @override
* @return {!Promise}
*/
connect() {
return this._runJsonCommand('new').then(response => {
const url = response.webSocketDebuggerUrl;
this._pageId = response.id;
return new Promise((resolve, reject) => {
const ws = new WebSocket(url, {
perMessageDeflate: false
});
ws.on('open', () => {
this._ws = ws;
resolve();
});
ws.on('message', data => this.handleRawMessage(data));
ws.on('close', this.dispose.bind(this));
ws.on('error', reject);
});
});
}
/**
* @param {!string} command
* @return {!Promise<string>}
*/
_runJsonCommand(command) {
return new Promise((resolve, reject) => {
const request = http.get({
hostname: hostname,
port: this.port,
path: '/json/' + command
}, response => {
let data = '';
response.on('data', chunk => {
data += chunk;
});
response.on('end', _ => {
if (response.statusCode === 200) {
try {
resolve(JSON.parse(data));
return;
} catch (e) {
// In the case of 'close' Chromium returns a string rather than JSON: goo.gl/7v27xD
if (data === 'Target is closing') {
return resolve({message: data});
}
return reject(e);
}
}
reject(new Error(`Protocol JSON API error (${command}), status: ${response.statusCode}`));
});
});
request.setTimeout(CONNECT_TIMEOUT, _ => {
request.abort();
// After aborting, we expect an ECONNRESET error. Ignore.
request.on('error', err => {
if (err.code !== 'ECONNRESET') {
throw err;
}
});
// Reject on error with code specifically indicating timeout in connection setup.
const err = new Error('Timeout waiting for initial Debugger Protocol connection.');
err.code = 'CRI_TIMEOUT';
log.error('CriConnection', err.message);
reject(err);
});
});
}
/**
* @override
*/
disconnect() {
if (!this._ws) {
log.warn('CriConnection', 'disconnect() was called without an established connection.');
return Promise.resolve();
}
return this._runJsonCommand(`close/${this._pageId}`).then(_ => {
this._ws.removeAllListeners();
this._ws.close();
this._ws = null;
this._pageId = null;
});
}
/**
* @override
* @param {string} message
*/
sendRawMessage(message) {
this._ws.send(message);
}
}
module.exports = CriConnection;