puppeteer/lib/Browser.js
Andrey Lushnikov 13e8580a34 Use puppeteer.launch instead of browser constructor (#255)
This patch:
- split browser launching logic from Browser into `lib/Launcher.js`
- introduce `puppeteer` namespace which currently has a single `launch`
  method to start a browser

With this patch, the browser is no longer created with the `new
Browser(..)` command. Instead, it should be "launched" via the
`puppeteer.launch` method:

```js
const puppeteer = require('puppeteer');
puppeteer.launch().then(async browser => {
  ...
});
```

With this approach browser instance lifetime matches the lifetime of
actual browser process. This helps us:
- remove proxy streams, e.g. browser.stderr and browser.stdout
- cleanup browser class and make it possible to connect to remote
  browser
- introduce events on the browser instance, e.g. 'page' event. In case
  of lazy-launching browser, we should've launch browser when an event
  listener is added, which is unneded comlpexity.
2017-08-14 18:08:06 -07:00

74 lines
2.0 KiB
JavaScript

/**
* Copyright 2017 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');
const Page = require('./Page');
class Browser {
/**
* @param {!Connection} connection
* @param {boolean} ignoreHTTPSErrors
* @param {function()=} closeCallback
*/
constructor(connection, ignoreHTTPSErrors, closeCallback) {
this._ignoreHTTPSErrors = ignoreHTTPSErrors;
this._screenshotTaskQueue = new TaskQueue();
this._connection = connection;
this._closeCallback = closeCallback || new Function();
}
/**
* @return {!Promise<!Page>}
*/
async newPage() {
const {targetId} = await this._connection.send('Target.createTarget', {url: 'about:blank'});
const client = await this._connection.createSession(targetId);
return await Page.create(client, this._ignoreHTTPSErrors, this._screenshotTaskQueue);
}
/**
* @return {!Promise<string>}
*/
async version() {
let version = await this._connection.send('Browser.getVersion');
return version.product;
}
close() {
this._connection.dispose();
this._closeCallback.call(null);
}
}
module.exports = Browser;
helper.tracePublicAPI(Browser);
class TaskQueue {
constructor() {
this._chain = Promise.resolve();
}
/**
* @param {function()} task
* @return {!Promise}
*/
postTask(task) {
const result = this._chain.then(task);
this._chain = result.catch(() => {});
return result;
}
}