mirror of
https://github.com/puppeteer/puppeteer
synced 2024-06-14 14:02:48 +00:00
c35821a1a1
- switch transport from TCP to WS (yay!) - implemenet `puppeter.connect()`, `browser.disconnect()`, `'disconnected'` event and `browser.wsEndpoint()`
103 lines
2.7 KiB
JavaScript
103 lines
2.7 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 WebSocket = require('ws');
|
|
|
|
/**
|
|
* @implements {!Puppeteer.ConnectionTransport}
|
|
*/
|
|
class WebSocketTransport {
|
|
/**
|
|
* @param {string} url
|
|
* @return {!Promise<!WebSocketTransport>}
|
|
*/
|
|
static create(url) {
|
|
return new Promise((resolve, reject) => {
|
|
const ws = new WebSocket(url, [], { perMessageDeflate: false });
|
|
ws.addEventListener('open', () => resolve(new WebSocketTransport(ws)));
|
|
ws.addEventListener('error', reject);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* @param {!WebSocket} ws
|
|
*/
|
|
constructor(ws) {
|
|
this._ws = ws;
|
|
this._dispatchQueue = new DispatchQueue(this);
|
|
this._ws.addEventListener('message', event => {
|
|
this._dispatchQueue.enqueue(event.data);
|
|
});
|
|
this._ws.addEventListener('close', event => {
|
|
if (this.onclose)
|
|
this.onclose.call(null);
|
|
});
|
|
// Silently ignore all errors - we don't know what to do with them.
|
|
this._ws.addEventListener('error', () => {});
|
|
this.onmessage = null;
|
|
this.onclose = null;
|
|
}
|
|
|
|
/**
|
|
* @param {string} message
|
|
*/
|
|
send(message) {
|
|
this._ws.send(message);
|
|
}
|
|
|
|
close() {
|
|
this._ws.close();
|
|
}
|
|
}
|
|
|
|
// We want to dispatch all "message" events in separate tasks
|
|
// to make sure all message-related promises are resolved first
|
|
// before dispatching next message.
|
|
//
|
|
// We cannot just use setTimeout() in Node.js here like we would
|
|
// do in Browser - see https://github.com/nodejs/node/issues/23773
|
|
// Thus implement a dispatch queue that enforces new tasks manually.
|
|
/**
|
|
* @internal
|
|
*/
|
|
class DispatchQueue {
|
|
constructor(transport) {
|
|
this._transport = transport;
|
|
|
|
this._timeoutId = null;
|
|
this._queue = [];
|
|
this._dispatch = this._dispatch.bind(this);
|
|
}
|
|
|
|
enqueue(message) {
|
|
this._queue.push(message);
|
|
if (!this._timeoutId)
|
|
this._timeoutId = setTimeout(this._dispatch, 0);
|
|
}
|
|
|
|
_dispatch() {
|
|
const message = this._queue.shift();
|
|
if (this._queue.length)
|
|
this._timeoutId = setTimeout(this._dispatch, 0)
|
|
else
|
|
this._timeoutId = null;
|
|
|
|
if (this._transport.onmessage)
|
|
this._transport.onmessage.call(null, message);
|
|
}
|
|
}
|
|
|
|
module.exports = WebSocketTransport;
|