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/**
* Copyright 2023 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.
*/
import * as BidiMapper from 'chromium-bidi/lib/cjs/bidiMapper/bidiMapper.js';
import * as Bidi from 'chromium-bidi/lib/cjs/protocol/protocol.js';
import type {ProtocolMapping} from 'devtools-protocol/types/protocol-mapping.js';
import {CDPSession, Connection as CDPPPtrConnection} from '../Connection.js';
import {Handler} from '../EventEmitter.js';
import {Connection as BidiPPtrConnection} from './Connection.js';
type CdpEvents = {
[Property in keyof ProtocolMapping.Events]: ProtocolMapping.Events[Property][0];
};
/**
* @internal
*/
export async function connectBidiOverCDP(
cdp: CDPPPtrConnection
): Promise<BidiPPtrConnection> {
const transportBiDi = new NoOpTransport();
const cdpConnectionAdapter = new CDPConnectionAdapter(cdp);
const pptrTransport = {
send(message: string): void {
// Forwards a BiDi command sent by Puppeteer to the input of the BidiServer.
transportBiDi.emitMessage(JSON.parse(message));
},
close(): void {
bidiServer.close();
cdpConnectionAdapter.close();
},
onmessage(_message: string): void {
// The method is overridden by the Connection.
},
};
transportBiDi.on('bidiResponse', (message: object) => {
// Forwards a BiDi event sent by BidiServer to Puppeteer.
pptrTransport.onmessage(JSON.stringify(message));
});
const pptrBiDiConnection = new BidiPPtrConnection(pptrTransport);
const bidiServer = await BidiMapper.BidiServer.createAndStart(
transportBiDi,
cdpConnectionAdapter,
''
);
return pptrBiDiConnection;
}
/**
* Manages CDPSessions for BidiServer.
* @internal
*/
class CDPConnectionAdapter {
#cdp: CDPPPtrConnection;
#adapters = new Map<CDPSession, CDPClientAdapter<CDPSession>>();
#browser: CDPClientAdapter<CDPPPtrConnection>;
constructor(cdp: CDPPPtrConnection) {
this.#cdp = cdp;
this.#browser = new CDPClientAdapter(cdp);
}
browserClient(): CDPClientAdapter<CDPPPtrConnection> {
return this.#browser;
}
getCdpClient(id: string) {
const session = this.#cdp.session(id);
if (!session) {
throw new Error('Unknown CDP session with id' + id);
}
if (!this.#adapters.has(session)) {
const adapter = new CDPClientAdapter(session);
this.#adapters.set(session, adapter);
return adapter;
}
return this.#adapters.get(session)!;
}
close() {
this.#browser.close();
for (const adapter of this.#adapters.values()) {
adapter.close();
}
}
}
/**
* Wrapper on top of CDPSession/CDPConnection to satisfy CDP interface that
* BidiServer needs.
*
* @internal
*/
class CDPClientAdapter<T extends Pick<CDPPPtrConnection, 'send' | 'on' | 'off'>>
extends BidiMapper.EventEmitter<CdpEvents>
implements BidiMapper.CdpClient
{
#closed = false;
#client: T;
constructor(client: T) {
super();
this.#client = client;
this.#client.on('*', this.#forwardMessage as Handler<any>);
}
#forwardMessage = <T extends keyof CdpEvents>(
method: T,
event: CdpEvents[T]
) => {
this.emit(method, event);
};
async sendCommand<T extends keyof ProtocolMapping.Commands>(
method: T,
...params: ProtocolMapping.Commands[T]['paramsType']
): Promise<ProtocolMapping.Commands[T]['returnType']> {
if (this.#closed) {
return;
}
try {
return await this.#client.send(method, ...params);
} catch (err) {
if (this.#closed) {
return;
}
throw err;
}
}
close() {
this.#client.off('*', this.#forwardMessage as Handler<any>);
this.#closed = true;
}
}
/**
* This transport is given to the BiDi server instance and allows Puppeteer
* to send and receive commands to the BiDiServer.
* @internal
*/
class NoOpTransport
extends BidiMapper.EventEmitter<any>
implements BidiMapper.BidiTransport
{
#onMessage: (
message: Bidi.Message.RawCommandRequest
) => Promise<void> | void = async (
_m: Bidi.Message.RawCommandRequest
): Promise<void> => {
return;
};
emitMessage(message: Bidi.Message.RawCommandRequest) {
void this.#onMessage(message);
}
setOnMessage(
onMessage: (message: Bidi.Message.RawCommandRequest) => Promise<void> | void
): void {
this.#onMessage = onMessage;
}
async sendMessage(message: Bidi.Message.OutgoingMessage): Promise<void> {
this.emit('bidiResponse', message);
}
close() {
this.#onMessage = async (
_m: Bidi.Message.RawCommandRequest
): Promise<void> => {
return;
};
}
}
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