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vscode-react-native/src/debugger

src/debugger/forkedAppWorker.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 Q from "q";
5import * as path from "path";
6import * as url from "url";
7import * as child_process from "child_process";
8import * as fs from "fs";
9import {ScriptImporter, DownloadedScript} from "./scriptImporter";
10
11import { logger } from "vscode-chrome-debug-core";
12import { ErrorHelper } from "../common/error/errorHelper";
13import { IDebuggeeWorker, RNAppMessage } from "./appWorker";
14import { RemoteExtension } from "../common/remoteExtension";
15import { InternalErrorCode } from "../common/error/internalErrorCode";
16import { getLoggingDirectory } from "../extension/log/LogHelper";
17
18function printDebuggingError(error: Error, reason: any) {
19 const nestedError = ErrorHelper.getNestedError(error, InternalErrorCode.DebuggingWontWorkReloadJSAndReconnect, reason);
20
21 logger.error(nestedError.message);
22}
23
24/** This class will run the RN App logic inside a forked Node process. The framework to run the logic is provided by the file
25 * debuggerWorker.js (designed to run on a WebWorker). We add a couple of tweaks (mostly to polyfill WebWorker API) to that
26 * file and load it inside of a process.
27 * On this side we listen to IPC messages and either respond to them or redirect them to packager via MultipleLifetimeAppWorker's
28 * instance. We also intercept packager's signal to load the bundle's code and mutate the message with path to file we've downloaded
29 * to let importScripts function take this file.
30 */
31export class ForkedAppWorker implements IDebuggeeWorker {
32
33 protected scriptImporter: ScriptImporter;
34 protected debuggeeProcess: child_process.ChildProcess | null = null;
35 /** A deferred that we use to make sure that worker has been loaded completely defore start sending IPC messages */
36 protected workerLoaded = Q.defer<void>();
37 private bundleLoaded: Q.Deferred<void>;
38 private remoteExtension: RemoteExtension;
39 private logWriteStream: fs.WriteStream;
40 private logDirectory: string | null;
41
42 constructor(
43 private packagerAddress: string,
44 private packagerPort: number,
45 private sourcesStoragePath: string,
46 private projectRootPath: string,
47 private postReplyToApp: (message: any) => void,
48 private packagerRemoteRoot?: string,
49 private packagerLocalRoot?: string
50 ) {
51 this.scriptImporter = new ScriptImporter(this.packagerAddress, this.packagerPort, this.sourcesStoragePath, this.packagerRemoteRoot, this.packagerLocalRoot);
52
53 this.remoteExtension = RemoteExtension.atProjectRootPath(this.projectRootPath);
54
55 this.remoteExtension.api.Debugger.onShowDevMenu(() => {
56 this.postMessage({
57 method: "vscode_showDevMenu",
58 });
59 });
60
61 this.remoteExtension.api.Debugger.onReloadApp(() => {
62 this.postMessage({
63 method: "vscode_reloadApp",
64 });
65 });
66 }
67
68 public stop() {
69 if (this.debuggeeProcess) {
70 logger.verbose(`About to kill debuggee with pid ${this.debuggeeProcess.pid}`);
71 this.debuggeeProcess.kill();
72 this.debuggeeProcess = null;
73 }
74 }
75
76 public start(): Q.Promise<number> {
77 let scriptToRunPath = path.resolve(this.sourcesStoragePath, ScriptImporter.DEBUGGER_WORKER_FILENAME);
78 const port = Math.round(Math.random() * 40000 + 3000);
79
80 // Note that we set --inspect-brk flag to pause the process on the first line - this is
81 // required for debug adapter to set the breakpoints BEFORE the debuggee has started.
82 // The adapter will continue execution once it's done with breakpoints.
83 const nodeArgs = [`--inspect-brk=${port}`, scriptToRunPath];
84 // Start child Node process in debugging mode
85 // Using fork instead of spawn causes breakage of piping between app worker and VS Code debug console, e.g. console.log() in application
86 // wouldn't work. Please see https://github.com/Microsoft/vscode-react-native/issues/758
87 this.debuggeeProcess = child_process.spawn("node", nodeArgs, {
88 stdio: ["pipe", "pipe", "pipe", "ipc"],
89 })
90 .on("message", (message: any) => {
91 // 'workerLoaded' is a special message that indicates that worker is done with loading.
92 // We need to wait for it before doing any IPC because process.send doesn't seems to care
93 // about whether the message has been received or not and the first messages are often get
94 // discarded by spawned process
95 if (message && message.workerLoaded) {
96 this.workerLoaded.resolve(void 0);
97 return;
98 }
99
100 this.postReplyToApp(message);
101 })
102 .on("error", (error: Error) => {
103 printDebuggingError(ErrorHelper.getInternalError(InternalErrorCode.ReactNativeWorkerProcessThrownAnError), error);
104 });
105
106 // If special env variables are defined, then write process outputs to file
107 this.logDirectory = getLoggingDirectory();
108
109 if (this.logDirectory) {
110 this.logWriteStream = fs.createWriteStream(path.join(this.logDirectory, "nodeProcessLog.txt"));
111 this.logWriteStream.on("error", err => {
112 logger.error(`Error creating log file at path: ${this.logDirectory}. Error: ${err.toString()}\n`);
113 });
114 this.debuggeeProcess.stdout.pipe(this.logWriteStream);
115 this.debuggeeProcess.stderr.pipe(this.logWriteStream);
116 this.debuggeeProcess.on("close", () => {
117 this.logWriteStream.end();
118 });
119 }
120
121 // Resolve with port debugger server is listening on
122 // This will be sent to subscribers of MLAppWorker in "connected" event
123 logger.verbose(`Spawned debuggee process with pid ${this.debuggeeProcess.pid} listening to ${port}`);
124
125 return Q.resolve(port);
126 }
127
128 public postMessage(rnMessage: RNAppMessage): Q.Promise<RNAppMessage> {
129 // Before sending messages, make sure that the worker is loaded
130 const promise = this.workerLoaded.promise
131 .then(() => {
132 if (rnMessage.method !== "executeApplicationScript") {
133 // Before sending messages, make sure that the app script executed
134 if (this.bundleLoaded) {
135 return this.bundleLoaded.promise.then(() => {
136 return rnMessage;
137 });
138 } else {
139 return rnMessage;
140 }
141 } else {
142 this.bundleLoaded = Q.defer<void>();
143 // When packager asks worker to load bundle we download that bundle and
144 // then set url field to point to that downloaded bundle, so the worker
145 // will take our modified bundle
146 if (rnMessage.url) {
147 const packagerUrl = url.parse(rnMessage.url);
148 packagerUrl.host = `${this.packagerAddress}:${this.packagerPort}`;
149 rnMessage = {
150 ...rnMessage,
151 url: url.format(packagerUrl),
152 };
153 logger.verbose(`Packager requested runtime to load script from ${rnMessage.url}`);
154 return this.scriptImporter.downloadAppScript(<string>rnMessage.url, this.projectRootPath)
155 .then((downloadedScript: DownloadedScript) => {
156 this.bundleLoaded.resolve(void 0);
157 return Object.assign({}, rnMessage, { url: downloadedScript.filepath });
158 });
159 } else {
160 throw ErrorHelper.getInternalError(InternalErrorCode.RNMessageWithMethodExecuteApplicationScriptDoesntHaveURLProperty);
161 }
162 }
163 });
164 promise.done(
165 (message: RNAppMessage) => {
166 if (this.debuggeeProcess) {
167 this.debuggeeProcess.send({ data: message });
168 }
169 },
170 (reason) => printDebuggingError(ErrorHelper.getInternalError(InternalErrorCode.CouldntImportScriptAt, rnMessage.url), reason));
171
172 return promise;
173 }
174}
175