[extension] Auto and manual stop process

extension/bwcontest/package-lock.json

@@ -10,6 +10,7 @@
 			"dependencies": {
 				"axios": "^1.4.0",
 				"fs-extra": "^11.1.1",
+				"tree-kill": "^1.2.2",
 				"vsce": "^2.15.0"
 			},
 			"devDependencies": {
@@ -5300,7 +5301,6 @@
 			"version": "1.2.2",
 			"resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
 			"integrity": "sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==",
-			"dev": true,
 			"bin": {
 				"tree-kill": "cli.js"
 			}

extension/bwcontest/package.json

@@ -103,6 +103,7 @@
 	"dependencies": {
 		"axios": "^1.4.0",
 		"fs-extra": "^11.1.1",
+		"tree-kill": "^1.2.2",
 		"vsce": "^2.15.0"
 	}
 }

extension/bwcontest/src/problemPanel.ts

@@ -17,6 +17,8 @@ export class BWPanel {
 	private readonly _extensionUri: vscode.Uri;
 	private _disposables: vscode.Disposable[] = [];
 	private static _context?: vscode.ExtensionContext;
+	private static _running: boolean;
+	private static _kill: Function | null;
 
 	public static createOrShow(context: vscode.ExtensionContext) {
 		this._context = context;
@@ -85,6 +87,12 @@ export class BWPanel {
 		this._panel.webview.html = this._getHtmlForWebview(webview);
 		webview.onDidReceiveMessage(async (data) => {
 			switch (data.type) {
+				case 'onKill': {
+					if (!BWPanel._running || !BWPanel._kill) {
+						break;
+					}
+					BWPanel._kill();
+				}
 				case 'onSubmit': {
 					await vscode.workspace.saveAll();
 					if (!data.value) {
@@ -113,12 +121,17 @@ export class BWPanel {
 					break;
 				}
 				case 'onRun': {
+					if (BWPanel._running === true) {
+						vscode.window.showErrorMessage('Already running');
+						break;
+					}
 					await vscode.workspace.saveAll();
 					if (!data.value) {
-						return;
+						break;
 					}
 					const repoDir = extensionSettings().repoClonePath;
-					runJava(
+					BWPanel._running = true;
+					const process = await runJava(
 						join(
 							repoDir,
 							'BWContest',
@@ -136,16 +149,29 @@ export class BWPanel {
 						),
 						data.value.problemPascalName,
 						data.value.input
-					)
+					);
+					if (!process) {
+						this._panel.webview.postMessage({
+							type: 'onOutput',
+							value: '[An error occurred while running]'
+						});
+						break;
+					}
+					process.output
 						.then((output) => {
 							this._panel.webview.postMessage({ type: 'onOutput', value: output });
+							BWPanel._running = false;
+							BWPanel._kill = null;
 						})
 						.catch(() => {
 							this._panel.webview.postMessage({
 								type: 'onOutput',
 								value: '[An error occurred while running]'
 							});
+							BWPanel._running = false;
+							BWPanel._kill = null;
 						});
+					BWPanel._kill = process.kill;
 					break;
 				}
 				case 'onStartup': {

extension/bwcontest/src/run/java.ts

@@ -5,6 +5,7 @@ import { exec, spawn } from 'child_process';
 import { extensionSettings } from '../extension';
 import { error } from 'console';
 import util = require('node:util');
+import kill = require('tree-kill');
 
 const execPromise = util.promisify(exec);
 
@@ -13,7 +14,7 @@ export async function runJava(
 	mainFile: string,
 	mainClass: string,
 	input: string
-): Promise<string> {
+): Promise<{ output: Promise<string>; kill: Function | null }> {
 	const javaPath = extensionSettings().javaPath;
 	if (javaPath == '') {
 		throw error('Java path not set');
@@ -30,9 +31,10 @@ export async function runJava(
 
 	const runCommand = `${join(javaPath, 'java')} -cp "${buildDir}" ${mainClass}`;
 
-	return new Promise((resolve) => {
-		let outputBuffer = '';
 	const child = spawn(runCommand, { shell: true });
+	let outputBuffer = '';
+	return {
+		output: new Promise((resolve) => {
 			child.stdout.setEncoding('utf8');
 			child.stdout.on('data', (data) => {
 				outputBuffer += data.toString();
@@ -44,8 +46,29 @@ export async function runJava(
 			child.stdin.write(input);
 			child.stdin.end();
 
+			let resolved = false;
+
 			child.on('close', () => {
+				if (!resolved) {
+					resolved = true;
 					resolve(outputBuffer);
-		});
-	});
+				}
+			});
+
+			setTimeout(() => {
+				if (!resolved) {
+					console.log('30 seconds reached, killing process');
+					resolved = true;
+					child.kill('SIGKILL');
+					resolve(outputBuffer + '\n[Timeout after 30 seconds]');
+				}
+			}, 30000);
+		}),
+		kill: () => {
+			if (child.pid) {
+				outputBuffer += '\n[Manually stopped]';
+				kill(child.pid);
+			}
+		}
+	};
 }

extension/bwcontest/webviews/components/ProblemPanel.svelte

@@ -61,6 +61,10 @@
         }
     }
 
+    function onKill() {
+        postMessage({type: 'onKill'});
+    }
+
     async function fetchProblemData() {
         if (sessionToken) {
             const res = await fetch(`http://localhost:5173/api/contest/${sessionToken}`);
@@ -125,7 +129,11 @@
                 {/if}
             </div>
             <textarea bind:this={outputText} disabled />
+            {#if !running}
                 <button style="margin-top:5px" on:click={onRun} type="button">Run</button>
+            {:else}
+                <button style="margin-top:5px" on:click={onKill} type="button">Stop</button>
+            {/if}
         </div>
     </div>
     <button on:click={onSubmit} type="button">Submit</button>