127 lines
3.4 KiB
JavaScript
127 lines
3.4 KiB
JavaScript
/**
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* Copyright 2018 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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const {Socket} = require('net');
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/**
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* @implements {!Puppeteer.ConnectionTransport}
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* @internal
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*/
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class FirefoxTransport {
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/**
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* @param {number} port
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* @return {!Promise<!FirefoxTransport>}
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*/
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static async create(port) {
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const socket = new Socket();
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try {
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await new Promise((resolve, reject) => {
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socket.once('connect', resolve);
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socket.once('error', reject);
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socket.connect({
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port,
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host: 'localhost'
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});
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});
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} catch (e) {
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socket.destroy();
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throw e;
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}
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return new FirefoxTransport(socket);
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}
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/**
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* @param {!Socket} socket
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*/
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constructor(socket) {
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this._socket = socket;
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this._socket.once('close', had_error => {
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if (this.onclose)
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this.onclose.call(null);
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});
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this._dispatchQueue = new DispatchQueue(this);
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let buffer = Buffer.from('');
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socket.on('data', async data => {
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buffer = Buffer.concat([buffer, data]);
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while (true) {
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const bufferString = buffer.toString();
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const seperatorIndex = bufferString.indexOf(':');
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if (seperatorIndex === -1)
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return;
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const length = parseInt(bufferString.substring(0, seperatorIndex), 10);
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if (buffer.length < length + seperatorIndex)
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return;
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const message = buffer.slice(seperatorIndex + 1, seperatorIndex + 1 + length).toString();
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buffer = buffer.slice(seperatorIndex + 1 + length);
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this._dispatchQueue.enqueue(message);
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}
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});
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// Silently ignore all errors - we don't know what to do with them.
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this._socket.on('error', () => {});
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this.onmessage = null;
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this.onclose = null;
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}
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/**
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* @param {string} message
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*/
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send(message) {
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this._socket.write(Buffer.byteLength(message) + ':' + message);
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}
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close() {
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this._socket.destroy();
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}
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}
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// We want to dispatch all "message" events in separate tasks
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// to make sure all message-related promises are resolved first
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// before dispatching next message.
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//
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// We cannot just use setTimeout() in Node.js here like we would
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// do in Browser - see https://github.com/nodejs/node/issues/23773
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// Thus implement a dispatch queue that enforces new tasks manually.
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/**
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* @internal
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*/
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class DispatchQueue {
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constructor(transport) {
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this._transport = transport;
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this._timeoutId = null;
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this._queue = [];
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this._dispatch = this._dispatch.bind(this);
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}
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enqueue(message) {
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this._queue.push(message);
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if (!this._timeoutId)
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this._timeoutId = setTimeout(this._dispatch, 0);
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}
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_dispatch() {
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const message = this._queue.shift();
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if (this._queue.length)
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this._timeoutId = setTimeout(this._dispatch, 0)
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else
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this._timeoutId = null;
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if (this._transport.onmessage)
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this._transport.onmessage.call(null, message);
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}
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}
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module.exports = FirefoxTransport;
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