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