fix(api): make pipe connection the default, expose webSocket launch option

docs/api.md

@@ -132,7 +132,7 @@ An example of launching a browser executable and connecting to a [Browser] later
 const playwright = require('playwright').webkit;  // Or 'chromium' or 'firefox'.
 
 (async () => {
-  const browserApp = await playwright.launchBrowserApp();
+  const browserApp = await playwright.launchBrowserApp({ webSocket: true });
   const connectOptions = browserApp.connectOptions();
   // Use connect options later to establish a connection.
   const browser = await playwright.connect(connectOptions);
@@ -229,7 +229,7 @@ Closes the browser gracefully and makes sure the process is terminated.
 
 #### browserApp.connectOptions()
 - returns: <[Object]>
-  - `browserWSEndpoint` <?[string]> a [browser websocket endpoint](#browserwsendpoint) to connect to.
+  - `browserWSEndpoint` <?[string]> a browser websocket endpoint to connect to.
   - `slowMo` <[number]>
   - `transport` <[ConnectionTransport]> **Experimental** A custom transport object which should be used to connect.
 
@@ -243,8 +243,6 @@ This options object can be passed to [chromiumPlaywright.connect(options)](#chro
 
 Browser websocket endpoint which can be used as an argument to [chromiumPlaywright.connect(options)](#chromiumplaywrightconnectoptions), [firefoxPlaywright.connect(options)](#firefoxplaywrightconnectoptions) or [webkitPlaywright.connect(options)](#webkitplaywrightconnectoptions) to establish connection to the browser.
 
-Learn more about [Chromium devtools protocol](https://chromedevtools.github.io/devtools-protocol) and the [browser endpoint](https://chromedevtools.github.io/devtools-protocol/#how-do-i-access-the-browser-target).
-
 ### class: BrowserContext
 
 * extends: [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)
@@ -3294,7 +3292,7 @@ If the function passed to the `worker.evaluateHandle` returns a [Promise], then
 
 #### chromiumPlaywright.connect(options)
 - `options` <[Object]>
-  - `browserWSEndpoint` <?[string]> a [browser websocket endpoint](#browserwsendpoint) to connect to.
+  - `browserWSEndpoint` <?[string]> a browser websocket endpoint to connect to.
   - `browserURL` <?[string]> a browser url to connect to, in format `http://${host}:${port}`. Use interchangeably with `browserWSEndpoint` to let Playwright fetch it from [metadata endpoint](https://chromedevtools.github.io/devtools-protocol/#how-do-i-access-the-browser-target).
   - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
   - `transport` <[ConnectionTransport]> **Experimental** Specify a custom transport object for Playwright to use.
@@ -3327,7 +3325,7 @@ The default flags that Chromium will be launched with.
   - `userDataDir` <[string]> Path to a [User Data Directory](https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md).
   - `env` <[Object]> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
   - `devtools` <[boolean]> Whether to auto-open a DevTools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
-  - `pipe` <[boolean]> Connects to the browser over a pipe instead of a WebSocket. Defaults to `false`.
+  - `webSocket` <[boolean]> Connects to the browser over a WebSocket instead of a pipe. Defaults to `false`.
 - returns: <[Promise]<[ChromiumBrowser]>> Promise which resolves to browser instance.
 
 
@@ -3361,7 +3359,7 @@ const browser = await playwright.launch({
   - `userDataDir` <[string]> Path to a [User Data Directory](https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md).
   - `env` <[Object]> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
   - `devtools` <[boolean]> Whether to auto-open a DevTools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
-  - `pipe` <[boolean]> Connects to the browser over a pipe instead of a WebSocket. Defaults to `false`.
+  - `webSocket` <[boolean]> Connects to the browser over a WebSocket instead of a pipe. Defaults to `false`.
 - returns: <[Promise]<[BrowserApp]>> Promise which resolves to browser server instance.
 
 ### class: ChromiumBrowser
@@ -3554,7 +3552,7 @@ Identifies what kind of target this is. Can be `"page"`, [`"background_page"`](h
 
 #### firefoxPlaywright.connect(options)
 - `options` <[Object]>
-  - `browserWSEndpoint` <?[string]> a [browser websocket endpoint](#browserwsendpoint) to connect to.
+  - `browserWSEndpoint` <?[string]> a browser websocket endpoint to connect to.
   - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
   - `transport` <[ConnectionTransport]> **Experimental** Specify a custom transport object for Playwright to use.
 - returns: <[Promise]<[FirefoxBrowser]>>
@@ -3584,6 +3582,7 @@ The default flags that Firefox will be launched with.
   - `dumpio` <[boolean]> Whether to pipe the browser process stdout and stderr into `process.stdout` and `process.stderr`. Defaults to `false`.
   - `userDataDir` <[string]> Path to a [User Data Directory](https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options#User_Profile).
   - `env` <[Object]> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
+  - `webSocket` <[boolean]> Connects to the browser over a WebSocket instead of a pipe. Defaults to `false`.
 - returns: <[Promise]<[FirefoxBrowser]>> Promise which resolves to browser instance.
 
 
@@ -3608,6 +3607,7 @@ const browser = await playwright.launch({
   - `dumpio` <[boolean]> Whether to pipe the browser process stdout and stderr into `process.stdout` and `process.stderr`. Defaults to `false`.
   - `userDataDir` <[string]> Path to a [User Data Directory](https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options#User_Profile).
   - `env` <[Object]> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
+  - `webSocket` <[boolean]> Connects to the browser over a WebSocket instead of a pipe. Defaults to `false`.
 - returns: <[Promise]<[BrowserApp]>> Promise which resolves to browser server instance.
 
 ### class: FirefoxBrowser
@@ -3630,7 +3630,7 @@ Firefox browser instance does not expose Firefox-specific features.
 
 #### webkitPlaywright.connect(options)
 - `options` <[Object]>
-  - `browserWSEndpoint` <?[string]> a [browser websocket endpoint](#browserwsendpoint) to connect to.
+  - `browserWSEndpoint` <?[string]> a browser websocket endpoint to connect to.
   - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
   - `transport` <[ConnectionTransport]> **Experimental** Specify a custom transport object for Playwright to use.
 - returns: <[Promise]<[WebKitBrowser]>>
@@ -3660,7 +3660,7 @@ The default flags that WebKit will be launched with.
   - `timeout` <[number]> Maximum time in milliseconds to wait for the browser instance to start. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
   - `dumpio` <[boolean]> Whether to pipe the browser process stdout and stderr into `process.stdout` and `process.stderr`. Defaults to `false`.
   - `env` <[Object]> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
-  - `pipe` <[boolean]> Connects to the browser over a pipe instead of a WebSocket. Defaults to `false`.
+  - `webSocket` <[boolean]> Connects to the browser over a WebSocket instead of a pipe. Defaults to `false`.
 - returns: <[Promise]<[WebKitBrowser]>> Promise which resolves to browser instance.
 
 
@@ -3685,7 +3685,7 @@ const browser = await playwright.launch({
   - `timeout` <[number]> Maximum time in milliseconds to wait for the browser instance to start. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
   - `dumpio` <[boolean]> Whether to pipe the browser process stdout and stderr into `process.stdout` and `process.stderr`. Defaults to `false`.
   - `env` <[Object]> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
-  - `pipe` <[boolean]> Connects to the browser over a pipe instead of a WebSocket. Defaults to `false`.
+  - `webSocket` <[boolean]> Connects to the browser over a WebSocket instead of a pipe. Defaults to `false`.
 - returns: <[Promise]<[BrowserApp]>> Promise which resolves to browser server instance.
 
 ### class: WebKitBrowser

src/chromium/crConnection.ts

@@ -26,6 +26,10 @@ export const ConnectionEvents = {
   Disconnected: Symbol('ConnectionEvents.Disconnected')
 };
 
+// CRPlaywright uses this special id to issue Browser.close command which we
+// should ignore.
+export const kBrowserCloseMessageId = -9999;
+
 export class CRConnection extends platform.EventEmitter {
   private _lastId = 0;
   private _transport: ConnectionTransport;
@@ -64,6 +68,8 @@ export class CRConnection extends platform.EventEmitter {
   async _onMessage(message: string) {
     debugProtocol('◀ RECV ' + message);
     const object = JSON.parse(message);
+    if (object.id === kBrowserCloseMessageId)
+      return;
     if (object.method === 'Target.attachedToTarget') {
       const sessionId = object.params.sessionId;
       const session = new CRSession(this, object.params.targetInfo.type, sessionId);

src/firefox/ffConnection.ts

@@ -26,6 +26,10 @@ export const ConnectionEvents = {
   Disconnected: Symbol('Disconnected'),
 };
 
+// FFPlaywright uses this special id to issue Browser.close command which we
+// should ignore.
+export const kBrowserCloseMessageId = -9999;
+
 export class FFConnection extends platform.EventEmitter {
   private _lastId: number;
   private _callbacks: Map<number, {resolve: Function, reject: Function, error: Error, method: string}>;
@@ -89,6 +93,8 @@ export class FFConnection extends platform.EventEmitter {
   async _onMessage(message: string) {
     debugProtocol('◀ RECV ' + message);
     const object = JSON.parse(message);
+    if (object.id === kBrowserCloseMessageId)
+      return;
     if (object.method === 'Target.attachedToTarget') {
       const sessionId = object.params.sessionId;
       const session = new FFSession(this, object.params.targetInfo.type, sessionId, message => this._rawSend({...message, sessionId}));

src/server/crPlaywright.ts

@@ -27,7 +27,7 @@ import { CRBrowser } from '../chromium/crBrowser';
 import * as platform from '../platform';
 import { TimeoutError } from '../errors';
 import { launchProcess, waitForLine } from '../server/processLauncher';
-import { CRConnection } from '../chromium/crConnection';
+import { kBrowserCloseMessageId } from '../chromium/crConnection';
 import { PipeTransport } from './pipeTransport';
 import { Playwright } from './playwright';
 import { createTransport, ConnectOptions } from '../browser';
@@ -53,7 +53,7 @@ export type LaunchOptions = ChromiumArgOptions & SlowMoOptions & {
   timeout?: number,
   dumpio?: boolean,
   env?: {[key: string]: string} | undefined,
-  pipe?: boolean,
+  webSocket?: boolean,
 };
 
 export class CRPlaywright implements Playwright {
@@ -79,7 +79,7 @@ export class CRPlaywright implements Playwright {
       args = [],
       dumpio = false,
       executablePath = null,
-      pipe = false,
+      webSocket = false,
       env = process.env,
       handleSIGINT = true,
       handleSIGTERM = true,
@@ -99,7 +99,7 @@ export class CRPlaywright implements Playwright {
     let temporaryUserDataDir: string | null = null;
 
     if (!chromeArguments.some(argument => argument.startsWith('--remote-debugging-')))
-      chromeArguments.push(pipe ? '--remote-debugging-pipe' : '--remote-debugging-port=0');
+      chromeArguments.push(webSocket ? '--remote-debugging-port=0' : '--remote-debugging-pipe');
     if (!chromeArguments.some(arg => arg.startsWith('--user-data-dir'))) {
       temporaryUserDataDir = await mkdtempAsync(CHROMIUM_PROFILE_PATH);
       chromeArguments.push(`--user-data-dir=${temporaryUserDataDir}`);
@@ -114,6 +114,8 @@ export class CRPlaywright implements Playwright {
     }
 
     const usePipe = chromeArguments.includes('--remote-debugging-pipe');
+    if (usePipe && webSocket)
+      throw new Error(`Argument "--remote-debugging-pipe" is not compatible with "webSocket" launch option.`);
 
     const { launchedProcess, gracefullyClose } = await launchProcess({
       executablePath: chromeExecutable!,
@@ -131,10 +133,10 @@ export class CRPlaywright implements Playwright {
 
         // We try to gracefully close to prevent crash reporting and core dumps.
         // Note that it's fine to reuse the pipe transport, since
-        // our connection is tolerant to unknown responses.
+        // our connection ignores kBrowserCloseMessageId.
         const transport = await createTransport(connectOptions);
-        const connection = new CRConnection(transport);
-        connection.rootSession.send('Browser.close');
+        const message = { method: 'Browser.close', id: kBrowserCloseMessageId };
+        transport.send(JSON.stringify(message));
       },
     });
 
@@ -152,6 +154,8 @@ export class CRPlaywright implements Playwright {
   }
 
   async connect(options: ConnectOptions & { browserURL?: string }): Promise<CRBrowser> {
+    if (options.transport && options.transport.onmessage)
+      throw new Error('Transport is already in use');
     if (options.browserURL) {
       assert(!options.browserWSEndpoint && !options.transport, 'Exactly one of browserWSEndpoint, browserURL or transport must be passed to connect');
       let connectionURL: string;

src/server/ffPlaywright.ts

@@ -21,7 +21,7 @@ import { DeviceDescriptors } from '../deviceDescriptors';
 import { launchProcess, waitForLine } from './processLauncher';
 import * as types from '../types';
 import * as platform from '../platform';
-import { FFConnection } from '../firefox/ffConnection';
+import { kBrowserCloseMessageId } from '../firefox/ffConnection';
 import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
@@ -51,6 +51,7 @@ export type LaunchOptions = FirefoxArgOptions & SlowMoOptions & {
   timeout?: number,
   dumpio?: boolean,
   env?: {[key: string]: string} | undefined,
+  webSocket?: boolean,
 };
 
 export class FFPlaywright implements Playwright {
@@ -82,6 +83,7 @@ export class FFPlaywright implements Playwright {
       handleSIGTERM = true,
       slowMo = 0,
       timeout = 30000,
+      webSocket = false,
     } = options;
 
     const firefoxArguments = [];
@@ -129,22 +131,29 @@ export class FFPlaywright implements Playwright {
         if (!connectOptions)
           return Promise.reject();
         // We try to gracefully close to prevent crash reporting and core dumps.
-        // Note that we don't support pipe yet, so there is no issue
-        // with reusing the same connection - we can always create a new one.
+        // Note that it's fine to reuse the pipe transport, since
+        // our connection ignores kBrowserCloseMessageId.
         const transport = await createTransport(connectOptions);
-        const connection = new FFConnection(transport);
-        connection.send('Browser.close');
+        const message = { method: 'Browser.close', params: {}, id: kBrowserCloseMessageId };
+        transport.send(JSON.stringify(message));
       },
     });
 
     const timeoutError = new TimeoutError(`Timed out after ${timeout} ms while trying to connect to Firefox!`);
     const match = await waitForLine(launchedProcess, launchedProcess.stdout, /^Juggler listening on (ws:\/\/.*)$/, timeout, timeoutError);
-    const url = match[1];
-    connectOptions = { browserWSEndpoint: url, slowMo };
+    const browserWSEndpoint = match[1];
+    if (webSocket) {
+      connectOptions = { browserWSEndpoint, slowMo };
+    } else {
+      const transport = await platform.createWebSocketTransport(browserWSEndpoint);
+      connectOptions = { transport, slowMo };
+    }
     return new BrowserApp(launchedProcess, gracefullyClose, connectOptions);
   }
 
   async connect(options: ConnectOptions): Promise<FFBrowser> {
+    if (options.transport && options.transport.onmessage)
+      throw new Error('Transport is already in use');
     return FFBrowser.connect(options);
   }
 

src/server/wkPlaywright.ts

@@ -56,7 +56,7 @@ export type LaunchOptions = WebKitArgOptions & SlowMoOptions & {
   timeout?: number,
   dumpio?: boolean,
   env?: {[key: string]: string} | undefined,
-  pipe?: boolean,
+  webSocket?: boolean,
 };
 
 export class WKPlaywright implements Playwright {
@@ -87,7 +87,7 @@ export class WKPlaywright implements Playwright {
       handleSIGTERM = true,
       handleSIGHUP = true,
       slowMo = 0,
-      pipe = false,
+      webSocket = false,
     } = options;
 
     const webkitArguments = [];
@@ -132,6 +132,8 @@ export class WKPlaywright implements Playwright {
         if (!transport)
           return Promise.reject();
         // We try to gracefully close to prevent crash reporting and core dumps.
+        // Note that it's fine to reuse the pipe transport, since
+        // our connection ignores kBrowserCloseMessageId.
         const message = JSON.stringify({method: 'Browser.close', params: {}, id: kBrowserCloseMessageId});
         transport.send(message);
       },
@@ -140,7 +142,7 @@ export class WKPlaywright implements Playwright {
     transport = new PipeTransport(launchedProcess.stdio[3] as NodeJS.WritableStream, launchedProcess.stdio[4] as NodeJS.ReadableStream);
 
     let connectOptions: ConnectOptions;
-    if (!pipe) {
+    if (webSocket) {
       const browserWSEndpoint = wrapTransportWithWebSocket(transport);
       connectOptions = { browserWSEndpoint, slowMo };
     } else {
@@ -150,6 +152,8 @@ export class WKPlaywright implements Playwright {
   }
 
   async connect(options: ConnectOptions): Promise<WKBrowser> {
+    if (options.transport && options.transport.onmessage)
+      throw new Error('Transport is already in use');
     return WKBrowser.connect(options);
   }
 

test/chromium/browser.spec.js

@@ -39,6 +39,7 @@ module.exports.describe = function({testRunner, expect, defaultBrowserOptions, p
       const options = Object.assign({}, defaultBrowserOptions, {
         // Disable DUMPIO to cleanly read stdout.
         dumpio: false,
+        webSocket: true,
       });
       const res = spawn('node', [path.join(__dirname, '..', 'fixtures', 'closeme.js'), playwrightPath, product, JSON.stringify(options)]);
       let wsEndPointCallback;

test/chromium/chromium.spec.js

@@ -21,20 +21,6 @@ module.exports.describe = function({testRunner, expect, playwright, FFOX, CHROMI
   const {it, fit, xit, dit} = testRunner;
   const {beforeAll, beforeEach, afterAll, afterEach} = testRunner;
 
-  describe('Chromium', function() {
-    it('should work across sessions', async function({browserApp, server, browser, newContext}) {
-      expect(browser.browserContexts().length).toBe(2);
-      await newContext();
-      expect(browser.browserContexts().length).toBe(3);
-      const remoteBrowser = await playwright.connect({
-        browserWSEndpoint: browserApp.wsEndpoint()
-      });
-      const contexts = remoteBrowser.browserContexts();
-      expect(contexts.length).toBe(3);
-      remoteBrowser.disconnect();
-    });
-	});
-
 	describe('Target', function() {
     it('Chromium.targets should return all of the targets', async({page, server, browser}) => {
       // The pages will be the testing page and the original newtab page