puppeteer/lib/PipeTransport.js

79 lines
2.1 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 {helper} = require('./helper');
/**
* @implements {!Puppeteer.ConnectionTransport}
*/
class PipeTransport {
/**
* @param {!NodeJS.WritableStream} pipeWrite
* @param {!NodeJS.ReadableStream} pipeRead
*/
constructor(pipeWrite, pipeRead) {
this._pipeWrite = pipeWrite;
this._pendingMessage = '';
this._eventListeners = [
helper.addEventListener(pipeRead, 'data', buffer => this._dispatch(buffer)),
helper.addEventListener(pipeRead, 'close', () => {
if (this.onclose)
this.onclose.call(null);
})
];
this.onmessage = null;
this.onclose = null;
}
/**
* @param {string} message
*/
send(message) {
this._pipeWrite.write(message);
this._pipeWrite.write('\0');
}
/**
* @param {!Buffer} buffer
*/
_dispatch(buffer) {
let end = buffer.indexOf('\0');
if (end === -1) {
this._pendingMessage += buffer.toString();
return;
}
const message = this._pendingMessage + buffer.toString(undefined, 0, end);
if (this.onmessage)
this.onmessage.call(null, message);
let start = end + 1;
end = buffer.indexOf('\0', start);
while (end !== -1) {
if (this.onmessage)
this.onmessage.call(null, buffer.toString(undefined, start, end));
start = end + 1;
end = buffer.indexOf('\0', start);
}
this._pendingMessage = buffer.toString(undefined, start);
}
close() {
this._pipeWrite = null;
helper.removeEventListeners(this._eventListeners);
}
}
module.exports = PipeTransport;