feat(rpc): use SerializedValue for CDPSession (#3076)

This is our way to define a schema for arbitrary values.

Author: dgozman

src/rpc/channels.ts

@@ -1571,21 +1571,15 @@ export interface CDPSessionChannel extends Channel {
 }
 export type CDPSessionEventEvent = {
   method: string,
-  params?: {
-
-  },
+  params?: SerializedValue,
 };
 export type CDPSessionDisconnectedEvent = {};
 export type CDPSessionSendParams = {
   method: string,
-  params?: {
-
-  },
+  params?: SerializedValue,
 };
 export type CDPSessionSendResult = {
-  result: {
-
-  },
+  result: SerializedValue,
 };
 export type CDPSessionDetachParams = {};
 export type CDPSessionDetachResult = void;

src/rpc/client/cdpSession.ts

@@ -17,6 +17,7 @@
 import { CDPSessionChannel, CDPSessionInitializer } from '../channels';
 import { ChannelOwner } from './channelOwner';
 import { Protocol } from '../../chromium/protocol';
+import { parseResult, serializeArgument } from './jsHandle';
 
 export class CDPSession extends ChannelOwner<CDPSessionChannel, CDPSessionInitializer> {
   static from(cdpSession: CDPSessionChannel): CDPSession {
@@ -32,7 +33,10 @@ export class CDPSession extends ChannelOwner<CDPSessionChannel, CDPSessionInitia
   constructor(parent: ChannelOwner, type: string, guid: string, initializer: CDPSessionInitializer) {
     super(parent, type, guid, initializer, true);
 
-    this._channel.on('event', ({ method, params }) => this.emit(method, params));
+    this._channel.on('event', ({ method, params }) => {
+      const cdpParams = params ? parseResult(params) : undefined;
+      this.emit(method, cdpParams);
+    });
     this._channel.on('disconnected', () => this._dispose());
 
     this.on = super.on;
@@ -47,8 +51,9 @@ export class CDPSession extends ChannelOwner<CDPSessionChannel, CDPSessionInitia
     params?: Protocol.CommandParameters[T]
   ): Promise<Protocol.CommandReturnValues[T]> {
     return this._wrapApiCall('cdpSession.send', async () => {
-      const result = await this._channel.send({ method, params });
-      return result.result as Protocol.CommandReturnValues[T];
+      const protocolParams = params ? serializeArgument(params).value : undefined;
+      const result = await this._channel.send({ method, params: protocolParams });
+      return parseResult(result.result) as Protocol.CommandReturnValues[T];
     });
   }
 

src/rpc/protocol.pdl

@@ -1407,16 +1407,16 @@ interface CDPSession
   event event
     parameters
       method: string
-      params?: object
+      params?: SerializedValue
 
   event disconnected
 
   command send
     parameters
       method: string
-      params?: object
+      params?: SerializedValue
     returns
-      result: object
+      result: SerializedValue
 
   command detach
 

src/rpc/server/cdpSessionDispatcher.ts

@@ -15,21 +15,26 @@
  */
 
 import { CRSession, CRSessionEvents } from '../../chromium/crConnection';
-import { CDPSessionChannel, CDPSessionInitializer } from '../channels';
+import { CDPSessionChannel, CDPSessionInitializer, SerializedValue } from '../channels';
 import { Dispatcher, DispatcherScope } from './dispatcher';
+import { serializeResult, parseArgument } from './jsHandleDispatcher';
 
 export class CDPSessionDispatcher extends Dispatcher<CRSession, CDPSessionInitializer> implements CDPSessionChannel {
   constructor(scope: DispatcherScope, crSession: CRSession) {
     super(scope, crSession, 'cdpSession', {}, true);
-    crSession._eventListener = (method, params) => this._dispatchEvent('event', { method, params });
+    crSession._eventListener = (method, cdpParams) => {
+      const params = cdpParams ? serializeResult(cdpParams) : undefined;
+      this._dispatchEvent('event', { method, params });
+    };
     crSession.on(CRSessionEvents.Disconnected, () => {
       this._dispatchEvent('disconnected');
       this._dispose();
     });
   }
 
-  async send(params: { method: string, params?: Object }): Promise<{ result: Object }> {
-    return { result: await this._object.send(params.method as any, params.params) };
+  async send(params: { method: string, params?: SerializedValue }): Promise<{ result: SerializedValue }> {
+    const cdpParams = params.params ? parseArgument({ value: params.params, handles: [] }) : undefined;
+    return { result: serializeResult(await this._object.send(params.method as any, cdpParams)) };
   }
 
   async detach(): Promise<void> {