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vscode-react-native/src/cdp-proxy

src/cdp-proxy/reactNativeCDPProxy.ts

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1// Copyright (c) Microsoft Corporation. All rights reserved.
2// Licensed under the MIT license. See LICENSE file in the project root for details.
3
4import {
5 Connection,
6 Server,
7 WebSocketTransport,
8 IProtocolCommand,
9 IProtocolError,
10 IProtocolSuccess
11} from "vscode-cdp-proxy";
12import { IncomingMessage } from "http";
13import { OutputChannelLogger } from "../extension/log/OutputChannelLogger";
14import { LogLevel } from "../extension/log/LogHelper";
15import { DebuggerEndpointHelper } from "./debuggerEndpointHelper";
16import { ICDPMessageHandler } from "./CDPMessageHandlers/ICDPMessageHandler";
17
18export class ReactNativeCDPProxy {
19
20 private readonly PROXY_LOG_TAGS = {
21 DEBUGGER_COMMAND: "Command Debugger To Target",
22 APPLICATION_COMMAND: "Command Target To Debugger",
23 DEBUGGER_REPLY: "Reply From Debugger To Target",
24 APPLICATION_REPLY: "Reply From Target To Debugger",
25 };
26
27 private server: Server | null;
28 private hostAddress: string;
29 private port: number;
30 private debuggerTarget: Connection;
31 private applicationTarget: Connection;
32 private logger: OutputChannelLogger;
33 private logLevel: LogLevel;
34 private debuggerEndpointHelper: DebuggerEndpointHelper;
35 private CDPMessageHandler: ICDPMessageHandler;
36 private applicationTargetPort: number;
37
38 constructor(hostAddress: string, port: number, logLevel: LogLevel = LogLevel.None) {
39 this.port = port;
40 this.hostAddress = hostAddress;
41 this.logger = OutputChannelLogger.getChannel("React Native Chrome Proxy", true, false, true);
42 this.logLevel = logLevel;
43 this.debuggerEndpointHelper = new DebuggerEndpointHelper();
44 }
45
46 public initializeServer(CDPMessageHandler: ICDPMessageHandler, logLevel: LogLevel): Promise<void> {
47 this.logLevel = logLevel;
48 this.CDPMessageHandler = CDPMessageHandler;
49
50 return Server.create({ port: this.port, host: this.hostAddress })
51 .then((server: Server) => {
52 this.server = server;
53 this.server.onConnection(this.onConnectionHandler.bind(this));
54 });
55 }
56
57 public stopServer(): void {
58 if (this.server) {
59 this.server.dispose();
60 this.server = null;
61 }
62 }
63
64 public setApplicationTargetPort(applicationTargetPort: number): void {
65 this.applicationTargetPort = applicationTargetPort;
66 }
67
68 private async onConnectionHandler([debuggerTarget, request]: [Connection, IncomingMessage]): Promise<void> {
69 this.debuggerTarget = debuggerTarget;
70
71 this.debuggerTarget.pause(); // don't listen for events until the target is ready
72
73 const browserInspectUri = await this.debuggerEndpointHelper.retryGetWSEndpoint(`http://localhost:${this.applicationTargetPort}`, 100);
74
75 this.applicationTarget = new Connection(await WebSocketTransport.create(browserInspectUri));
76
77 this.applicationTarget.onError(this.onApplicationTargetError.bind(this));
78 this.debuggerTarget.onError(this.onDebuggerTargetError.bind(this));
79
80 this.applicationTarget.onCommand(this.handleApplicationTargetCommand.bind(this));
81 this.debuggerTarget.onCommand(this.handleDebuggerTargetCommand.bind(this));
82
83 this.applicationTarget.onReply(this.handleApplicationTargetReply.bind(this));
84 this.debuggerTarget.onReply(this.handleDebuggerTargetReply.bind(this));
85
86 this.debuggerTarget.onEnd(this.onDebuggerTargetClosed.bind(this));
87
88 // dequeue any messages we got in the meantime
89 this.debuggerTarget.unpause();
90 }
91
92 private handleDebuggerTargetCommand(event: IProtocolCommand) {
93 this.logger.logWithCustomTag(this.PROXY_LOG_TAGS.DEBUGGER_COMMAND, JSON.stringify(event, null , 2), this.logLevel);
94 const processedMessage = this.CDPMessageHandler.processDebuggerCDPMessage(event);
95
96 if (processedMessage.sendBack) {
97 this.debuggerTarget.send(processedMessage.event);
98 } else {
99 this.applicationTarget.send(processedMessage.event);
100 }
101 }
102
103 private handleApplicationTargetCommand(event: IProtocolCommand) {
104 this.logger.logWithCustomTag(this.PROXY_LOG_TAGS.APPLICATION_COMMAND, JSON.stringify(event, null , 2), this.logLevel);
105 const processedMessage = this.CDPMessageHandler.processApplicationCDPMessage(event);
106
107 if (processedMessage.sendBack) {
108 this.applicationTarget.send(processedMessage.event);
109 } else {
110 this.debuggerTarget.send(processedMessage.event);
111 }
112 }
113
114 private handleDebuggerTargetReply(event: IProtocolError | IProtocolSuccess) {
115 this.logger.logWithCustomTag(this.PROXY_LOG_TAGS.DEBUGGER_REPLY, JSON.stringify(event, null , 2), this.logLevel);
116 const processedMessage = this.CDPMessageHandler.processDebuggerCDPMessage(event);
117
118 if (processedMessage.sendBack) {
119 this.debuggerTarget.send(processedMessage.event);
120 } else {
121 this.applicationTarget.send(processedMessage.event);
122 }
123 }
124
125 private handleApplicationTargetReply(event: IProtocolError | IProtocolSuccess) {
126 this.logger.logWithCustomTag(this.PROXY_LOG_TAGS.APPLICATION_REPLY, JSON.stringify(event, null , 2), this.logLevel);
127 const processedMessage = this.CDPMessageHandler.processApplicationCDPMessage(event);
128
129 if (processedMessage.sendBack) {
130 this.applicationTarget.send(processedMessage.event);
131 } else {
132 this.debuggerTarget.send(processedMessage.event);
133 }
134 }
135
136 private onDebuggerTargetError(err: Error) {
137 this.logger.error("Error on debugger transport", err);
138 }
139
140 private onApplicationTargetError(err: Error) {
141 this.logger.error("Error on application transport", err);
142 }
143
144 private async onDebuggerTargetClosed() {
145 this.CDPMessageHandler.processDebuggerCDPMessage({method: "close"});
146 }
147}
148