feat(rpc): simplify browser name detection on the client side (#3670)

src/browserServerImpl.ts

@@ -22,7 +22,6 @@ import { Browser } from './server/browser';
 import { ChildProcess } from 'child_process';
 import { EventEmitter } from 'ws';
 import { DispatcherScope, DispatcherConnection } from './dispatchers/dispatcher';
-import { BrowserTypeDispatcher } from './dispatchers/browserTypeDispatcher';
 import { BrowserDispatcher } from './dispatchers/browserDispatcher';
 import { BrowserContextDispatcher } from './dispatchers/browserContextDispatcher';
 import { BrowserNewContextParams, BrowserContextChannel } from './protocol/channels';
@@ -106,8 +105,7 @@ export class BrowserServerImpl extends EventEmitter implements BrowserServer {
       connection.dispatch(JSON.parse(Buffer.from(message).toString()));
     });
     socket.on('error', () => {});
-    const browserType = new BrowserTypeDispatcher(connection.rootDispatcher(), this._browserType);
-    const browser = new ConnectedBrowser(browserType._scope, this._browser);
+    const browser = new ConnectedBrowser(connection.rootDispatcher(), this._browser);
     socket.on('close', () => {
       // Avoid sending any more messages over closed socket.
       connection.onmessage = () => {};

src/client/browser.ts

@@ -19,7 +19,6 @@ import { BrowserContext } from './browserContext';
 import { Page } from './page';
 import { ChannelOwner } from './channelOwner';
 import { Events } from './events';
-import { BrowserType } from './browserType';
 import { BrowserContextOptions } from './types';
 import { validateHeaders } from './network';
 import { headersObjectToArray } from '../utils/utils';
@@ -29,7 +28,6 @@ export class Browser extends ChannelOwner<channels.BrowserChannel, channels.Brow
   private _isConnected = true;
   private _isClosedOrClosing = false;
   private _closedPromise: Promise<void>;
-  readonly _browserType: BrowserType;
   _isRemote = false;
 
   static from(browser: channels.BrowserChannel): Browser {
@@ -42,7 +40,6 @@ export class Browser extends ChannelOwner<channels.BrowserChannel, channels.Brow
 
   constructor(parent: ChannelOwner, type: string, guid: string, initializer: channels.BrowserInitializer) {
     super(parent, type, guid, initializer);
-    this._browserType = parent as BrowserType;
     this._channel.on('close', () => this._didClose());
     this._closedPromise = new Promise(f => this.once(Events.Browser.Disconnected, f));
   }

src/client/connection.ts

@@ -132,33 +132,26 @@ export class Connection {
       case 'BindingCall':
         result = new BindingCall(parent, type, guid, initializer);
         break;
-      case 'Browser':
-        if ((parent as BrowserType).name() === 'chromium')
+      case 'Browser': {
+        const browserName = (initializer as channels.BrowserInitializer).name;
+        if (browserName === 'chromium')
           result = new ChromiumBrowser(parent, type, guid, initializer);
-        else if ((parent as BrowserType).name() === 'webkit')
+        else if (browserName === 'webkit')
           result = new WebKitBrowser(parent, type, guid, initializer);
-        else if ((parent as BrowserType).name() === 'firefox')
+        else if (browserName === 'firefox')
           result = new FirefoxBrowser(parent, type, guid, initializer);
         else
           result = new Browser(parent, type, guid, initializer);
         break;
-      case 'BrowserContext':
-        let browserName = '';
-        if (parent instanceof ElectronApplication) {
-          // Launching electron produces ElectronApplication parent for BrowserContext.
-          browserName = 'electron';
-        } else if (parent instanceof Browser) {
-          // Launching a browser produces Browser parent for BrowserContext.
-          browserName = parent._browserType.name();
-        } else {
-          // Launching persistent context produces BrowserType parent for BrowserContext.
-          browserName = (parent as BrowserType).name();
-        }
+      }
+      case 'BrowserContext': {
+        const browserName = (initializer as channels.BrowserContextInitializer).browserName;
         if (browserName === 'chromium')
           result = new ChromiumBrowserContext(parent, type, guid, initializer);
         else
           result = new BrowserContext(parent, type, guid, initializer, browserName);
         break;
+      }
       case 'BrowserType':
         result = new BrowserType(parent, type, guid, initializer);
         break;

src/dispatchers/browserContextDispatcher.ts

@@ -26,7 +26,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
   private _context: BrowserContext;
 
   constructor(scope: DispatcherScope, context: BrowserContext) {
-    super(scope, context, 'BrowserContext', {}, true);
+    super(scope, context, 'BrowserContext', { browserName: context._browser._options.name }, true);
     this._context = context;
 
     for (const page of context.pages())
@@ -122,6 +122,8 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
   }
 
   async crNewCDPSession(params: channels.BrowserContextCrNewCDPSessionParams): Promise<channels.BrowserContextCrNewCDPSessionResult> {
+    if (this._object._browser._options.name !== 'chromium')
+      throw new Error(`CDP session is only available in Chromium`);
     const crBrowserContext = this._object as CRBrowserContext;
     return { session: new CDPSessionDispatcher(this._scope, await crBrowserContext.newCDPSession((params.page as PageDispatcher)._object)) };
   }

src/dispatchers/browserDispatcher.ts

@@ -24,7 +24,7 @@ import { PageDispatcher } from './pageDispatcher';
 
 export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserInitializer> implements channels.BrowserChannel {
   constructor(scope: DispatcherScope, browser: Browser, guid?: string) {
-    super(scope, browser, 'Browser', { version: browser.version() }, true, guid);
+    super(scope, browser, 'Browser', { version: browser.version(), name: browser._options.name }, true, guid);
     browser.on(Browser.Events.Disconnected, () => this._didClose());
   }
 
@@ -42,16 +42,22 @@ export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserIniti
   }
 
   async crNewBrowserCDPSession(): Promise<channels.BrowserCrNewBrowserCDPSessionResult> {
+    if (this._object._options.name !== 'chromium')
+      throw new Error(`CDP session is only available in Chromium`);
     const crBrowser = this._object as CRBrowser;
     return { session: new CDPSessionDispatcher(this._scope, await crBrowser.newBrowserCDPSession()) };
   }
 
   async crStartTracing(params: channels.BrowserCrStartTracingParams): Promise<void> {
+    if (this._object._options.name !== 'chromium')
+      throw new Error(`Tracing is only available in Chromium`);
     const crBrowser = this._object as CRBrowser;
     await crBrowser.startTracing(params.page ? (params.page as PageDispatcher)._object : undefined, params);
   }
 
   async crStopTracing(): Promise<channels.BrowserCrStopTracingResult> {
+    if (this._object._options.name !== 'chromium')
+      throw new Error(`Tracing is only available in Chromium`);
     const crBrowser = this._object as CRBrowser;
     const buffer = await crBrowser.stopTracing();
     return { binary: buffer.toString('base64') };

src/protocol/channels.ts

@@ -319,6 +319,7 @@ export type BrowserTypeLaunchPersistentContextResult = {
 // ----------- Browser -----------
 export type BrowserInitializer = {
   version: string,
+  name: string,
 };
 export interface BrowserChannel extends Channel {
   on(event: 'close', callback: (params: BrowserCloseEvent) => void): this;
@@ -426,7 +427,9 @@ export type BrowserCrStopTracingResult = {
 };
 
 // ----------- BrowserContext -----------
-export type BrowserContextInitializer = {};
+export type BrowserContextInitializer = {
+  browserName: string,
+};
 export interface BrowserContextChannel extends Channel {
   on(event: 'bindingCall', callback: (params: BrowserContextBindingCallEvent) => void): this;
   on(event: 'close', callback: (params: BrowserContextCloseEvent) => void): this;

src/protocol/protocol.yml

@@ -300,6 +300,7 @@ Browser:
 
   initializer:
     version: string
+    name: string
 
   commands:
 
@@ -380,6 +381,9 @@ Browser:
 BrowserContext:
   type: interface
 
+  initializer:
+    browserName: string
+
   commands:
 
     addCookies: