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vscode-react-native/src/debugger

src/debugger/appWorker.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 * as vm from "vm";
5import * as Q from "q";
6import * as path from "path";
7import * as WebSocket from "ws";
8import {ScriptImporter} from "./scriptImporter";
9import {Packager} from "../common/packager";
10import {ErrorHelper} from "../common/error/errorHelper";
11import {Log} from "../common/log/log";
12import {LogLevel} from "../common/log/logHelper";
13import {Node} from "../common/node/node";
14
15import Module = require("module");
16
17// This file is a replacement of: https://github.com/facebook/react-native/blob/8d397b4cbc05ad801cfafb421cee39bcfe89711d/local-cli/server/util/debugger.html for Node.JS
18
19interface DebuggerWorkerSandbox {
20 __filename: string;
21 __dirname: string;
22 self: DebuggerWorkerSandbox;
23 console: typeof console;
24 require: (id: string) => any;
25 importScripts: (url: string) => void;
26 postMessage: (object: any) => void;
27 onmessage: (object: RNAppMessage) => void;
28 postMessageArgument: RNAppMessage; // We use this argument to pass messages to the worker
29}
30
31interface RNAppMessage {
32 method: string;
33 // These objects have also other properties but that we don't currently use
34}
35
36function printDebuggingError(message: string, reason: any) {
37 Log.logWarning(ErrorHelper.getNestedWarning(reason, `${message}. Debugging won't work: Try reloading the JS from inside the app, or Reconnect the VS Code debugger`));
38}
39
40export class SandboxedAppWorker {
41 /** This class will run the RN App logic inside a sandbox. The framework to run the logic is provided by the file
42 * debuggerWorker.js (designed to run on a WebWorker). We load that file inside a sandbox, and then we use the
43 * PROCESS_MESSAGE_INSIDE_SANDBOX script to execute the logic to respond to a message inside the sandbox.
44 * The code inside the debuggerWorker.js will call the global function postMessage to send a reply back to the app,
45 * so we define our custom function there, so we can handle the message. We also provide our own importScript function
46 * to download any script used by debuggerWorker.js
47 */
48 private sourcesStoragePath: string;
49 private debugAdapterPort: number;
50 private postReplyToApp: (message: any) => void;
51
52 private sandbox: DebuggerWorkerSandbox;
53 private sandboxContext: vm.Context;
54 private scriptToReceiveMessageInSandbox: vm.Script;
55
56 private pendingScriptImport = Q(void 0);
57
58 private static PROCESS_MESSAGE_INSIDE_SANDBOX = "onmessage({ data: postMessageArgument });";
59
60 constructor(sourcesStoragePath: string, debugAdapterPort: number, postReplyToApp: (message: any) => void) {
61 this.sourcesStoragePath = sourcesStoragePath;
62 this.debugAdapterPort = debugAdapterPort;
63 this.postReplyToApp = postReplyToApp;
64 this.scriptToReceiveMessageInSandbox = new vm.Script(SandboxedAppWorker.PROCESS_MESSAGE_INSIDE_SANDBOX);
65 }
66
67 public start(): Q.Promise<void> {
68 let scriptToRunPath = require.resolve(path.join(this.sourcesStoragePath, ScriptImporter.DEBUGGER_WORKER_FILE_BASENAME));
69 this.initializeSandboxAndContext(scriptToRunPath);
70 return this.readFileContents(scriptToRunPath).then(fileContents =>
71 // On a debugger worker the onmessage variable already exist. We need to declare it before the
72 // javascript file can assign it. We do it in the first line without a new line to not break
73 // the debugging experience of debugging debuggerWorker.js itself (as part of the extension)
74 this.runInSandbox(scriptToRunPath, "var onmessage = null; " + fileContents));
75 }
76
77 public postMessage(object: RNAppMessage): void {
78 this.sandbox.postMessageArgument = object;
79 this.scriptToReceiveMessageInSandbox.runInContext(this.sandboxContext);
80 }
81
82 private initializeSandboxAndContext(scriptToRunPath: string): void {
83 let scriptToRunModule = new Module(scriptToRunPath);
84
85 this.sandbox = {
86 __filename: scriptToRunPath,
87 __dirname: path.dirname(scriptToRunPath),
88 self: null,
89 console: console,
90 require: (filePath: string) => scriptToRunModule.require(filePath), // Give the sandbox access to require("<filePath>");
91 importScripts: (url: string) => this.importScripts(url), // Import script like using <script/>
92 postMessage: (object: any) => this.gotResponseFromDebuggerWorker(object), // Post message back to the UI thread
93 onmessage: null,
94 postMessageArgument: null
95 };
96 this.sandbox.self = this.sandbox;
97
98 this.sandboxContext = vm.createContext(this.sandbox);
99 }
100
101 private runInSandbox(filename: string, fileContents?: string): Q.Promise<void> {
102 let fileContentsPromise = fileContents
103 ? Q(fileContents)
104 : this.readFileContents(filename);
105
106 return fileContentsPromise.then(contents => {
107 vm.runInContext(contents, this.sandboxContext, filename);
108 });
109 }
110
111 private readFileContents(filename: string) {
112 return new Node.FileSystem().readFile(filename).then(contents => contents.toString());
113 }
114
115 private importScripts(url: string): void {
116 /* The debuggerWorker.js executes this code:
117 importScripts(message.url);
118 sendReply();
119
120 In the original code importScripts is a sync call. In our code it's async, so we need to mess with sendReply() so we won't
121 actually send the reply back to the application until after importScripts has finished executing. We use
122 this.pendingScriptImport to make the gotResponseFromDebuggerWorker() method hold the reply back, until've finished importing
123 and running the script */
124 let defer = Q.defer<{}>();
125 this.pendingScriptImport = defer.promise;
126
127 // The next line converts to any due to the incorrect typing on node.d.ts of vm.runInThisContext
128 new ScriptImporter(this.sourcesStoragePath).downloadAppScript(url, this.debugAdapterPort)
129 .then(downloadedScript =>
130 this.runInSandbox(downloadedScript.filepath, downloadedScript.contents))
131 .done(() => {
132 // Now we let the reply to the app proceed
133 defer.resolve({});
134 }, reason => {
135 printDebuggingError(`Couldn't import script at <${url}>`, reason);
136 });
137 }
138
139 private gotResponseFromDebuggerWorker(object: any): void {
140 // We might need to hold the response until a script is imported. See comments on this.importScripts()
141 this.pendingScriptImport.done(() =>
142 this.postReplyToApp(object), reason => {
143 printDebuggingError("Unexpected internal error while processing a message from the RN App.", reason);
144 });
145 }
146}
147
148export class MultipleLifetimesAppWorker {
149 /** This class will create a SandboxedAppWorker that will run the RN App logic, and then create a socket
150 * and send the RN App messages to the SandboxedAppWorker. The only RN App message that this class handles
151 * is the prepareJSRuntime, which we reply to the RN App that the sandbox was created succesfully.
152 * When the socket closes, we'll create a new SandboxedAppWorker and a new socket pair and discard the old ones.
153 */
154 private sourcesStoragePath: string;
155 private debugAdapterPort: number;
156 private socketToApp: WebSocket;
157 private singleLifetimeWorker: SandboxedAppWorker;
158
159 constructor(sourcesStoragePath: string, debugAdapterPort: number) {
160 this.sourcesStoragePath = sourcesStoragePath;
161 this.debugAdapterPort = debugAdapterPort;
162 console.assert(!!this.sourcesStoragePath, "The sourcesStoragePath argument was null or empty");
163 }
164
165 public start(): Q.Promise<void> {
166 this.singleLifetimeWorker = new SandboxedAppWorker(this.sourcesStoragePath, this.debugAdapterPort, (message) => {
167 this.sendMessageToApp(message);
168 });
169 return this.singleLifetimeWorker.start().then(() => {
170 this.socketToApp = this.createSocketToApp();
171 });
172 }
173
174 private createSocketToApp() {
175 let socketToApp = new WebSocket(this.debuggerProxyUrl());
176 socketToApp.on("open", () =>
177 this.onSocketOpened());
178 socketToApp.on("close", () =>
179 this.onSocketClose());
180 socketToApp.on("message",
181 (message: any) => this.onMessage(message));
182 socketToApp.on("error",
183 (error: Error) => printDebuggingError("An error ocurred while using the socket to communicate with the React Native app", error));
184 return socketToApp;
185 }
186
187 private debuggerProxyUrl() {
188 return `ws://${Packager.HOST}/debugger-proxy?role=debugger&name=vscode`;
189 }
190
191 private onSocketOpened() {
192 Log.logMessage("Established a connection with the Proxy (Packager) to the React Native application");
193 }
194
195 private onSocketClose() {
196 // TODO: Add some logic to not print this message that often, we'll spam the user
197 Log.logMessage("Disconnected from the Proxy (Packager) to the React Native application. Retrying reconnection soon...");
198 setTimeout(() => this.start(), 100);
199 }
200
201 private onMessage(message: string) {
202 try {
203 Log.logInternalMessage(LogLevel.Trace, "From RN APP: " + message);
204 let object = <RNAppMessage>JSON.parse(message);
205 if (object.method === "prepareJSRuntime") {
206 // The MultipleLifetimesAppWorker will handle prepareJSRuntime aka create new lifetime
207 this.gotPrepareJSRuntime(object);
208 } else if (object.method) {
209 // All the other messages are handled by the single lifetime worker
210 this.singleLifetimeWorker.postMessage(object);
211 } else {
212 // Message doesn't have a method. Ignore it. This is an info message instead of warn because it's normal and expected
213 Log.logInternalMessage(LogLevel.Info, "The react-native app sent a message without specifying a method: " + message);
214 }
215 } catch (exception) {
216 printDebuggingError(`Failed to process message from the React Native app. Message:\n${message}`, exception);
217 }
218 }
219
220 private gotPrepareJSRuntime(message: any): void {
221 // Create the sandbox, and replay that we finished processing the message
222 this.sendMessageToApp({ replyID: parseInt(message.id, 10) });
223 }
224
225 private sendMessageToApp(message: any) {
226 let stringified: string = null;
227 try {
228 stringified = JSON.stringify(message);
229 Log.logInternalMessage(LogLevel.Trace, "To RN APP: " + stringified);
230 this.socketToApp.send(stringified);
231 } catch (exception) {
232 let messageToShow = stringified || ("" + message); // Try to show the stringified version, but show the toString if unavailable
233 printDebuggingError(`Failed to send message to the React Native app. Message:\n${messageToShow}`, exception);
234 }
235 }
236}
237