feat(core): Add internal mode for native Python runner (no-changelog) (#19288)

packages/@n8n/config/src/configs/logging.config.ts

@@ -16,6 +16,8 @@ export const LOG_SCOPES = [
 	'scaling',
 	'waiting-executions',
 	'task-runner',
+	'task-runner-js',
+	'task-runner-py',
 	'insights',
 	'workflow-activation',
 	'ssh-client',
@@ -112,7 +114,8 @@ export class LoggingConfig {
 	 * - `redis`
 	 * - `scaling`
 	 * - `waiting-executions`
-	 * - `task-runner`
+	 * - `task-runner-js`
+	 * - `task-runner-py`
 	 * - `workflow-activation`
 	 * - `insights`
 	 *

packages/@n8n/task-runner-python/src/constants.py

@@ -19,7 +19,7 @@ RUNNER_NAME = "Python Task Runner"
 DEFAULT_MAX_CONCURRENCY = 5  # tasks
 DEFAULT_MAX_PAYLOAD_SIZE = 1024 * 1024 * 1024  # 1 GiB
 DEFAULT_TASK_TIMEOUT = 60  # seconds
-DEFAULT_AUTO_SHUTDOWN_TIMEOUT = 15  # seconds
+DEFAULT_AUTO_SHUTDOWN_TIMEOUT = 0  # seconds
 DEFAULT_SHUTDOWN_TIMEOUT = 10  # seconds
 OFFER_INTERVAL = 0.25  # 250ms
 OFFER_VALIDITY = 5000  # ms

packages/cli/src/task-runners/__tests__/task-runner-process-restart-loop-detector.test.ts

@@ -5,14 +5,14 @@ import { mock } from 'jest-mock-extended';
 import { TaskRunnerRestartLoopError } from '@/task-runners/errors/task-runner-restart-loop-error';
 import type { TaskBrokerAuthService } from '@/task-runners/task-broker/auth/task-broker-auth.service';
 import { TaskRunnerLifecycleEvents } from '@/task-runners/task-runner-lifecycle-events';
-import { TaskRunnerProcess } from '@/task-runners/task-runner-process';
+import { JsTaskRunnerProcess } from '@/task-runners/task-runner-process-js';
 import { TaskRunnerProcessRestartLoopDetector } from '@/task-runners/task-runner-process-restart-loop-detector';
 
 describe('TaskRunnerProcessRestartLoopDetector', () => {
 	const mockLogger = mock<Logger>();
 	const mockAuthService = mock<TaskBrokerAuthService>();
 	const runnerConfig = new TaskRunnersConfig();
-	const taskRunnerProcess = new TaskRunnerProcess(
+	const taskRunnerProcess = new JsTaskRunnerProcess(
 		mockLogger,
 		runnerConfig,
 		mockAuthService,

packages/cli/src/task-runners/__tests__/task-runner-process.test.ts

@@ -5,7 +5,7 @@ import { mock } from 'jest-mock-extended';
 import type { ChildProcess, SpawnOptions } from 'node:child_process';
 
 import type { TaskBrokerAuthService } from '@/task-runners/task-broker/auth/task-broker-auth.service';
-import { TaskRunnerProcess } from '@/task-runners/task-runner-process';
+import { JsTaskRunnerProcess } from '@/task-runners/task-runner-process-js';
 
 import type { TaskRunnerLifecycleEvents } from '../task-runner-lifecycle-events';
 
@@ -28,7 +28,7 @@ describe('TaskRunnerProcess', () => {
 	runnerConfig.mode = 'internal';
 	runnerConfig.insecureMode = false;
 	const authService = mock<TaskBrokerAuthService>();
-	let taskRunnerProcess = new TaskRunnerProcess(logger, runnerConfig, authService, mock());
+	let taskRunnerProcess = new JsTaskRunnerProcess(logger, runnerConfig, authService, mock());
 
 	afterEach(async () => {
 		spawnMock.mockClear();
@@ -38,14 +38,14 @@ describe('TaskRunnerProcess', () => {
 		it('should throw if runner mode is external', () => {
 			runnerConfig.mode = 'external';
 
-			expect(() => new TaskRunnerProcess(logger, runnerConfig, authService, mock())).toThrow();
+			expect(() => new JsTaskRunnerProcess(logger, runnerConfig, authService, mock())).toThrow();
 
 			runnerConfig.mode = 'internal';
 		});
 
 		it('should register listener for `runner:failed-heartbeat-check` event', () => {
 			const runnerLifecycleEvents = mock<TaskRunnerLifecycleEvents>();
-			new TaskRunnerProcess(logger, runnerConfig, authService, runnerLifecycleEvents);
+			new JsTaskRunnerProcess(logger, runnerConfig, authService, runnerLifecycleEvents);
 
 			expect(runnerLifecycleEvents.on).toHaveBeenCalledWith(
 				'runner:failed-heartbeat-check',
@@ -55,7 +55,7 @@ describe('TaskRunnerProcess', () => {
 
 		it('should register listener for `runner:timed-out-during-task` event', () => {
 			const runnerLifecycleEvents = mock<TaskRunnerLifecycleEvents>();
-			new TaskRunnerProcess(logger, runnerConfig, authService, runnerLifecycleEvents);
+			new JsTaskRunnerProcess(logger, runnerConfig, authService, runnerLifecycleEvents);
 
 			expect(runnerLifecycleEvents.on).toHaveBeenCalledWith(
 				'runner:timed-out-during-task',
@@ -66,7 +66,7 @@ describe('TaskRunnerProcess', () => {
 
 	describe('start', () => {
 		beforeEach(() => {
-			taskRunnerProcess = new TaskRunnerProcess(logger, runnerConfig, authService, mock());
+			taskRunnerProcess = new JsTaskRunnerProcess(logger, runnerConfig, authService, mock());
 		});
 
 		test.each([
@@ -166,7 +166,7 @@ describe('TaskRunnerProcess', () => {
 		it('on insecure mode, should not use --disallow-code-generation-from-strings and --disable-proto=delete flags', async () => {
 			jest.spyOn(authService, 'createGrantToken').mockResolvedValue('grantToken');
 			runnerConfig.insecureMode = true;
-			const insecureTaskRunnerProcess = new TaskRunnerProcess(
+			const insecureTaskRunnerProcess = new JsTaskRunnerProcess(
 				logger,
 				runnerConfig,
 				authService,

packages/cli/src/task-runners/errors/missing-requirements.error.ts

@@ -0,0 +1,19 @@
+import { UserError } from 'n8n-workflow';
+
+const ERROR_MESSAGE = 'Failed to start Python task runner in internal mode.';
+
+type ReasonId = 'python' | 'venv';
+
+const HINT =
+	'Launching a Python runner in internal mode is intended only for debugging and is not recommended for production. Users are encouraged to deploy in external mode. See: https://docs.n8n.io/hosting/configuration/task-runners/#setting-up-external-mode';
+
+export class MissingRequirementsError extends UserError {
+	constructor(reasonId: ReasonId) {
+		const reason = {
+			python: 'because Python 3 is missing from this system.',
+			venv: 'because its virtual environment is missing from this system.',
+		}[reasonId];
+
+		super([ERROR_MESSAGE, reason, HINT].join(' '));
+	}
+}

packages/cli/src/task-runners/internal-task-runner-disconnect-analyzer.ts

@@ -6,8 +6,8 @@ import type { DisconnectErrorOptions } from '@/task-runners/task-broker/task-bro
 import { DefaultTaskRunnerDisconnectAnalyzer } from './default-task-runner-disconnect-analyzer';
 import { TaskRunnerOomError } from './errors/task-runner-oom-error';
 import { SlidingWindowSignal } from './sliding-window-signal';
-import type { ExitReason, TaskRunnerProcessEventMap } from './task-runner-process';
+import type { ExitReason, TaskRunnerProcessEventMap } from './task-runner-process-base';
-import { TaskRunnerProcess } from './task-runner-process';
+import { JsTaskRunnerProcess } from './task-runner-process-js';
 
 /**
  * Analyzes the disconnect reason of a task runner process to provide a more
@@ -19,7 +19,7 @@ export class InternalTaskRunnerDisconnectAnalyzer extends DefaultTaskRunnerDisco
 
 	constructor(
 		private readonly runnerConfig: TaskRunnersConfig,
-		private readonly taskRunnerProcess: TaskRunnerProcess,
+		private readonly taskRunnerProcess: JsTaskRunnerProcess,
 	) {
 		super();
 

packages/cli/src/task-runners/task-runner-module.ts

@@ -8,7 +8,8 @@ import * as a from 'node:assert/strict';
 
 import type { TaskRunnerRestartLoopError } from '@/task-runners/errors/task-runner-restart-loop-error';
 import { TaskBrokerWsServer } from '@/task-runners/task-broker/task-broker-ws-server';
-import type { TaskRunnerProcess } from '@/task-runners/task-runner-process';
+import type { JsTaskRunnerProcess } from '@/task-runners/task-runner-process-js';
+import type { PyTaskRunnerProcess } from '@/task-runners/task-runner-process-py';
 import { TaskRunnerProcessRestartLoopDetector } from '@/task-runners/task-runner-process-restart-loop-detector';
 
 import { MissingAuthTokenError } from './errors/missing-auth-token.error';
@@ -28,9 +29,13 @@ export class TaskRunnerModule {
 
 	private taskRequester: LocalTaskRequester | undefined;
 
-	private taskRunnerProcess: TaskRunnerProcess | undefined;
+	private jsRunnerProcess: JsTaskRunnerProcess | undefined;
 
-	private taskRunnerProcessRestartLoopDetector: TaskRunnerProcessRestartLoopDetector | undefined;
+	private pyRunnerProcess: PyTaskRunnerProcess | undefined;
+
+	private jsRunnerProcessRestartLoopDetector: TaskRunnerProcessRestartLoopDetector | undefined;
+
+	private pyRunnerProcessRestartLoopDetector: TaskRunnerProcessRestartLoopDetector | undefined;
 
 	constructor(
 		private readonly logger: Logger,
@@ -50,17 +55,22 @@ export class TaskRunnerModule {
 		await this.loadTaskRequester();
 		await this.loadTaskBroker();
 
-		if (mode === 'internal') {
+		if (mode === 'internal') await this.startInternalTaskRunners();
-			await this.startInternalTaskRunner();
-		}
 	}
 
 	@OnShutdown()
 	async stop() {
 		const stopRunnerProcessTask = (async () => {
-			if (this.taskRunnerProcess) {
+			if (this.jsRunnerProcess) {
-				await this.taskRunnerProcess.stop();
+				await this.jsRunnerProcess.stop();
-				this.taskRunnerProcess = undefined;
+				this.jsRunnerProcess = undefined;
+			}
+		})();
+
+		const stopPythonRunnerProcessTask = (async () => {
+			if (this.pyRunnerProcess) {
+				await this.pyRunnerProcess.stop();
+				this.pyRunnerProcess = undefined;
 			}
 		})();
 
@@ -71,7 +81,7 @@ export class TaskRunnerModule {
 			}
 		})();
 
-		await Promise.all([stopRunnerProcessTask, stopRunnerServerTask]);
+		await Promise.all([stopRunnerProcessTask, stopPythonRunnerProcessTask, stopRunnerServerTask]);
 	}
 
 	private async loadTaskRequester() {
@@ -93,20 +103,33 @@ export class TaskRunnerModule {
 		await this.taskBrokerHttpServer.start();
 	}
 
-	private async startInternalTaskRunner() {
+	private async startInternalTaskRunners() {
 		a.ok(this.taskBrokerWsServer, 'Task Runner WS Server not loaded');
 
-		const { TaskRunnerProcess } = await import('@/task-runners/task-runner-process');
+		const { JsTaskRunnerProcess } = await import('@/task-runners/task-runner-process-js');
-		this.taskRunnerProcess = Container.get(TaskRunnerProcess);
+		this.jsRunnerProcess = Container.get(JsTaskRunnerProcess);
-		this.taskRunnerProcessRestartLoopDetector = new TaskRunnerProcessRestartLoopDetector(
+		this.jsRunnerProcessRestartLoopDetector = new TaskRunnerProcessRestartLoopDetector(
-			this.taskRunnerProcess,
+			this.jsRunnerProcess,
 		);
-		this.taskRunnerProcessRestartLoopDetector.on(
+		this.jsRunnerProcessRestartLoopDetector.on(
 			'restart-loop-detected',
 			this.onRunnerRestartLoopDetected,
 		);
 
-		await this.taskRunnerProcess.start();
+		await this.jsRunnerProcess.start();
+
+		if (process.env.N8N_NATIVE_PYTHON_RUNNER === 'true') {
+			const { PyTaskRunnerProcess } = await import('@/task-runners/task-runner-process-py');
+			this.pyRunnerProcess = Container.get(PyTaskRunnerProcess);
+			this.pyRunnerProcessRestartLoopDetector = new TaskRunnerProcessRestartLoopDetector(
+				this.pyRunnerProcess,
+			);
+			this.pyRunnerProcessRestartLoopDetector.on(
+				'restart-loop-detected',
+				this.onRunnerRestartLoopDetected,
+			);
+			await this.pyRunnerProcess.start();
+		}
 
 		const { InternalTaskRunnerDisconnectAnalyzer } = await import(
 			'@/task-runners/internal-task-runner-disconnect-analyzer'

packages/cli/src/task-runners/task-runner-process-base.ts

@@ -0,0 +1,123 @@
+import { Logger } from '@n8n/backend-common';
+import { LogScope, TaskRunnersConfig } from '@n8n/config';
+import { OnShutdown } from '@n8n/decorators';
+import { Service } from '@n8n/di';
+import assert from 'node:assert/strict';
+import { spawn } from 'node:child_process';
+
+import { TypedEmitter } from '@/typed-emitter';
+
+import { forwardToLogger } from './forward-to-logger';
+import { TaskBrokerAuthService } from './task-broker/auth/task-broker-auth.service';
+import { TaskRunnerLifecycleEvents } from './task-runner-lifecycle-events';
+
+export type ChildProcess = ReturnType<typeof spawn>;
+
+export type ExitReason = 'unknown' | 'oom';
+
+export type TaskRunnerProcessEventMap = {
+	exit: {
+		reason: ExitReason;
+	};
+};
+
+@Service()
+export abstract class TaskRunnerProcessBase extends TypedEmitter<TaskRunnerProcessEventMap> {
+	protected readonly name: string;
+
+	protected readonly loggerScope: LogScope;
+
+	protected process: ChildProcess | null = null;
+
+	protected _runPromise: Promise<void> | null = null;
+
+	protected isShuttingDown = false;
+
+	constructor(
+		protected readonly logger: Logger,
+		protected readonly runnerConfig: TaskRunnersConfig,
+		protected readonly authService: TaskBrokerAuthService,
+		protected readonly runnerLifecycleEvents: TaskRunnerLifecycleEvents,
+	) {
+		super();
+		this.logger = logger.scoped(this.loggerScope);
+
+		this.runnerLifecycleEvents.on('runner:failed-heartbeat-check', () => {
+			this.logger.warn('Task runner failed heartbeat check, restarting...');
+			void this.forceRestart();
+		});
+
+		this.runnerLifecycleEvents.on('runner:timed-out-during-task', () => {
+			this.logger.warn('Task runner timed out during task, restarting...');
+			void this.forceRestart();
+		});
+	}
+
+	get isRunning() {
+		return this.process !== null;
+	}
+
+	get pid() {
+		return this.process?.pid;
+	}
+
+	get runPromise() {
+		return this._runPromise;
+	}
+
+	get isInternal() {
+		return this.runnerConfig.mode === 'internal';
+	}
+
+	async start() {
+		assert(!this.process, `${this.name} already running`);
+
+		const grantToken = await this.authService.createGrantToken();
+		const taskBrokerUri = `http://127.0.0.1:${this.runnerConfig.port}`;
+
+		this.process = await this.startProcess(grantToken, taskBrokerUri);
+		forwardToLogger(this.logger, this.process, `[${this.name}] `);
+		this.monitorProcess(this.process);
+	}
+
+	@OnShutdown()
+	async stop() {
+		if (!this.process) return;
+
+		this.isShuttingDown = true;
+		this.process.kill();
+		await this._runPromise;
+		this.isShuttingDown = false;
+	}
+
+	/** Force-restart a task runner process suspected of being unresponsive. */
+	protected async forceRestart() {
+		if (!this.process) return;
+
+		this.process.kill('SIGKILL');
+		await this._runPromise;
+	}
+
+	protected onProcessExit(code: number | null, resolveFn: () => void) {
+		this.process = null;
+		const exitReason = this.analyzeExitReason?.(code) ?? { reason: 'unknown' };
+		this.emit('exit', exitReason);
+		resolveFn();
+		if (!this.isShuttingDown) {
+			setImmediate(async () => await this.start());
+		}
+	}
+
+	protected monitorProcess(taskRunnerProcess: ChildProcess) {
+		this._runPromise = new Promise((resolve) => {
+			this.setupProcessMonitoring?.(taskRunnerProcess);
+			taskRunnerProcess.on('exit', (code) => {
+				this.onProcessExit(code, resolve);
+			});
+		});
+	}
+
+	abstract startProcess(grantToken: string, taskBrokerUri: string): Promise<ChildProcess>;
+	setupProcessMonitoring?(process: ChildProcess): void;
+	analyzeExitReason?(code: number | null): { reason: ExitReason };
+}

packages/cli/src/task-runners/task-runner-process-js.ts

@@ -0,0 +1,89 @@
+import { Logger } from '@n8n/backend-common';
+import { TaskRunnersConfig } from '@n8n/config';
+import { Service } from '@n8n/di';
+import assert from 'node:assert/strict';
+import { spawn } from 'node:child_process';
+import * as process from 'node:process';
+
+import { NodeProcessOomDetector } from './node-process-oom-detector';
+import { TaskBrokerAuthService } from './task-broker/auth/task-broker-auth.service';
+import { TaskRunnerLifecycleEvents } from './task-runner-lifecycle-events';
+import { ChildProcess, ExitReason, TaskRunnerProcessBase } from './task-runner-process-base';
+
+/**
+ * Responsible for managing a JavaScript task runner as a child process.
+ * This is for internal mode, which is NOT recommended for production.
+ */
+@Service()
+export class JsTaskRunnerProcess extends TaskRunnerProcessBase {
+	readonly name = 'runnner:js';
+
+	readonly loggerScope = 'task-runner-js';
+
+	private oomDetector: NodeProcessOomDetector | null = null;
+
+	constructor(
+		readonly logger: Logger,
+		readonly runnerConfig: TaskRunnersConfig,
+		readonly authService: TaskBrokerAuthService,
+		readonly runnerLifecycleEvents: TaskRunnerLifecycleEvents,
+	) {
+		super(logger, runnerConfig, authService, runnerLifecycleEvents);
+
+		assert(this.isInternal, `${this.constructor.name} cannot be used in external mode`);
+	}
+
+	async startProcess(grantToken: string, taskBrokerUri: string): Promise<ChildProcess> {
+		const startScript = require.resolve('@n8n/task-runner/start');
+		const flags = this.runnerConfig.insecureMode
+			? []
+			: ['--disallow-code-generation-from-strings', '--disable-proto=delete'];
+
+		return spawn('node', [...flags, startScript], {
+			env: this.getProcessEnvVars(grantToken, taskBrokerUri),
+		});
+	}
+
+	setupProcessMonitoring(process: ChildProcess) {
+		this.oomDetector = new NodeProcessOomDetector(process);
+	}
+
+	analyzeExitReason(): { reason: ExitReason } {
+		return { reason: this.oomDetector?.didProcessOom ? 'oom' : 'unknown' };
+	}
+
+	private getProcessEnvVars(grantToken: string, taskBrokerUri: string) {
+		const envVars: Record<string, string | undefined> = {
+			// system environment
+			PATH: process.env.PATH,
+			HOME: process.env.HOME,
+			NODE_PATH: process.env.NODE_PATH,
+
+			// n8n
+			GENERIC_TIMEZONE: process.env.GENERIC_TIMEZONE,
+			NODE_FUNCTION_ALLOW_BUILTIN: process.env.NODE_FUNCTION_ALLOW_BUILTIN,
+			NODE_FUNCTION_ALLOW_EXTERNAL: process.env.NODE_FUNCTION_ALLOW_EXTERNAL,
+
+			// sentry
+			N8N_SENTRY_DSN: process.env.N8N_SENTRY_DSN,
+			N8N_VERSION: process.env.N8N_VERSION,
+			ENVIRONMENT: process.env.ENVIRONMENT,
+			DEPLOYMENT_NAME: process.env.DEPLOYMENT_NAME,
+
+			// runner
+			N8N_RUNNERS_GRANT_TOKEN: grantToken,
+			N8N_RUNNERS_TASK_BROKER_URI: taskBrokerUri,
+			N8N_RUNNERS_MAX_PAYLOAD: this.runnerConfig.maxPayload.toString(),
+			N8N_RUNNERS_MAX_CONCURRENCY: this.runnerConfig.maxConcurrency.toString(),
+			N8N_RUNNERS_TASK_TIMEOUT: this.runnerConfig.taskTimeout.toString(),
+			N8N_RUNNERS_HEARTBEAT_INTERVAL: this.runnerConfig.heartbeatInterval.toString(),
+			N8N_RUNNERS_INSECURE_MODE: process.env.N8N_RUNNERS_INSECURE_MODE,
+		};
+
+		if (this.runnerConfig.maxOldSpaceSize) {
+			envVars.NODE_OPTIONS = `--max-old-space-size=${this.runnerConfig.maxOldSpaceSize}`;
+		}
+
+		return envVars;
+	}
+}

packages/cli/src/task-runners/task-runner-process-py.ts

@@ -0,0 +1,68 @@
+import { Logger } from '@n8n/backend-common';
+import { TaskRunnersConfig } from '@n8n/config';
+import { Service } from '@n8n/di';
+import { exec, spawn } from 'node:child_process';
+import { access } from 'node:fs/promises';
+import path from 'node:path';
+import { promisify } from 'node:util';
+
+import { MissingRequirementsError } from './errors/missing-requirements.error';
+import { TaskBrokerAuthService } from './task-broker/auth/task-broker-auth.service';
+import { TaskRunnerLifecycleEvents } from './task-runner-lifecycle-events';
+import { TaskRunnerProcessBase } from './task-runner-process-base';
+
+const asyncExec = promisify(exec);
+
+/**
+ * Responsible for managing a Python task runner as a child process.
+ * This is for internal mode, which is NOT recommended for production.
+ */
+@Service()
+export class PyTaskRunnerProcess extends TaskRunnerProcessBase {
+	protected readonly name = 'runner:py';
+
+	protected readonly loggerScope = 'task-runner-py';
+
+	constructor(
+		readonly logger: Logger,
+		readonly runnerConfig: TaskRunnersConfig,
+		readonly authService: TaskBrokerAuthService,
+		readonly runnerLifecycleEvents: TaskRunnerLifecycleEvents,
+	) {
+		super(logger, runnerConfig, authService, runnerLifecycleEvents);
+	}
+
+	async startProcess(grantToken: string, taskBrokerUri: string) {
+		try {
+			await asyncExec('python3 --version', { timeout: 5000 });
+		} catch {
+			throw new MissingRequirementsError('python');
+		}
+
+		const pythonDir = path.join(__dirname, '../../../@n8n/task-runner-python');
+		const venvPath = path.join(pythonDir, '.venv/bin/python');
+
+		try {
+			await access(venvPath);
+		} catch {
+			throw new MissingRequirementsError('venv');
+		}
+
+		return spawn(venvPath, ['-m', 'src.main'], {
+			cwd: pythonDir,
+			env: {
+				// system environment
+				PATH: process.env.PATH,
+				HOME: process.env.HOME,
+
+				// runner
+				N8N_RUNNERS_GRANT_TOKEN: grantToken,
+				N8N_RUNNERS_TASK_BROKER_URI: taskBrokerUri,
+				N8N_RUNNERS_MAX_PAYLOAD: this.runnerConfig.maxPayload.toString(),
+				N8N_RUNNERS_MAX_CONCURRENCY: this.runnerConfig.maxConcurrency.toString(),
+				N8N_RUNNERS_TASK_TIMEOUT: this.runnerConfig.taskTimeout.toString(),
+				N8N_RUNNERS_HEARTBEAT_INTERVAL: this.runnerConfig.heartbeatInterval.toString(),
+			},
+		});
+	}
+}

packages/cli/src/task-runners/task-runner-process-restart-loop-detector.ts

@@ -1,9 +1,10 @@
 import { Time } from '@n8n/constants';
 
 import { TaskRunnerRestartLoopError } from '@/task-runners/errors/task-runner-restart-loop-error';
-import type { TaskRunnerProcess } from '@/task-runners/task-runner-process';
 import { TypedEmitter } from '@/typed-emitter';
 
+import type { TaskRunnerProcessBase } from './task-runner-process-base';
+
 const MAX_RESTARTS = 5;
 const RESTARTS_WINDOW = 2 * Time.seconds.toMilliseconds;
 
@@ -32,7 +33,7 @@ export class TaskRunnerProcessRestartLoopDetector extends TypedEmitter<TaskRunne
 	/** Time when the first restart of a loop happened within a time window */
 	private firstRestartedAt = Date.now();
 
-	constructor(private readonly taskRunnerProcess: TaskRunnerProcess) {
+	constructor(private readonly taskRunnerProcess: TaskRunnerProcessBase) {
 		super();
 
 		this.taskRunnerProcess.on('exit', () => {

packages/cli/src/task-runners/task-runner-process.ts

@@ -1,201 +0,0 @@
-import { Logger } from '@n8n/backend-common';
-import { TaskRunnersConfig } from '@n8n/config';
-import { OnShutdown } from '@n8n/decorators';
-import { Service } from '@n8n/di';
-import * as a from 'node:assert/strict';
-import { spawn } from 'node:child_process';
-import * as process from 'node:process';
-
-import { forwardToLogger } from './forward-to-logger';
-import { NodeProcessOomDetector } from './node-process-oom-detector';
-import { TaskBrokerAuthService } from './task-broker/auth/task-broker-auth.service';
-import { TaskRunnerLifecycleEvents } from './task-runner-lifecycle-events';
-import { TypedEmitter } from '../typed-emitter';
-
-type ChildProcess = ReturnType<typeof spawn>;
-
-export type ExitReason = 'unknown' | 'oom';
-
-export type TaskRunnerProcessEventMap = {
-	exit: {
-		reason: ExitReason;
-	};
-};
-
-/**
- * Manages the JS task runner process as a child process
- */
-@Service()
-export class TaskRunnerProcess extends TypedEmitter<TaskRunnerProcessEventMap> {
-	get isRunning() {
-		return this.process !== null;
-	}
-
-	/** The process ID of the task runner process */
-	get pid() {
-		return this.process?.pid;
-	}
-
-	/** Promise that resolves when the process has exited */
-	get runPromise() {
-		return this._runPromise;
-	}
-
-	private process: ChildProcess | null = null;
-
-	private _runPromise: Promise<void> | null = null;
-
-	private oomDetector: NodeProcessOomDetector | null = null;
-
-	private isShuttingDown = false;
-
-	private logger: Logger;
-
-	/** Environment variables inherited by the child process from the current environment. */
-	private readonly passthroughEnvVars = [
-		'PATH',
-		'HOME', // So home directory can be resolved correctly
-		'GENERIC_TIMEZONE',
-		'NODE_FUNCTION_ALLOW_BUILTIN',
-		'NODE_FUNCTION_ALLOW_EXTERNAL',
-		'N8N_SENTRY_DSN',
-		'N8N_RUNNERS_INSECURE_MODE',
-		// Metadata about the environment
-		'N8N_VERSION',
-		'ENVIRONMENT',
-		'DEPLOYMENT_NAME',
-		'NODE_PATH',
-	] as const;
-
-	private readonly mode: 'insecure' | 'secure' = 'secure';
-
-	constructor(
-		logger: Logger,
-		private readonly runnerConfig: TaskRunnersConfig,
-		private readonly authService: TaskBrokerAuthService,
-		private readonly runnerLifecycleEvents: TaskRunnerLifecycleEvents,
-	) {
-		super();
-
-		a.ok(
-			this.runnerConfig.mode !== 'external',
-			'Task Runner Process cannot be used in external mode',
-		);
-
-		this.mode = this.runnerConfig.insecureMode ? 'insecure' : 'secure';
-
-		this.logger = logger.scoped('task-runner');
-
-		this.runnerLifecycleEvents.on('runner:failed-heartbeat-check', () => {
-			this.logger.warn('Task runner failed heartbeat check, restarting...');
-			void this.forceRestart();
-		});
-
-		this.runnerLifecycleEvents.on('runner:timed-out-during-task', () => {
-			this.logger.warn('Task runner timed out during task, restarting...');
-			void this.forceRestart();
-		});
-	}
-
-	async start() {
-		a.ok(!this.process, 'Task Runner Process already running');
-
-		const grantToken = await this.authService.createGrantToken();
-
-		const taskBrokerUri = `http://127.0.0.1:${this.runnerConfig.port}`;
-		this.process = this.startNode(grantToken, taskBrokerUri);
-
-		forwardToLogger(this.logger, this.process, '[Task Runner]: ');
-
-		this.monitorProcess(this.process);
-	}
-
-	startNode(grantToken: string, taskBrokerUri: string) {
-		const startScript = require.resolve('@n8n/task-runner/start');
-
-		const flags =
-			this.mode === 'secure'
-				? ['--disallow-code-generation-from-strings', '--disable-proto=delete']
-				: [];
-
-		return spawn('node', [...flags, startScript], {
-			env: this.getProcessEnvVars(grantToken, taskBrokerUri),
-		});
-	}
-
-	@OnShutdown()
-	async stop() {
-		if (!this.process) return;
-
-		this.isShuttingDown = true;
-
-		// TODO: Timeout & force kill
-		this.killNode();
-		await this._runPromise;
-
-		this.isShuttingDown = false;
-	}
-
-	/** Force-restart a runner suspected of being unresponsive. */
-	async forceRestart() {
-		if (!this.process) return;
-
-		this.process.kill('SIGKILL');
-
-		await this._runPromise;
-	}
-
-	killNode() {
-		if (!this.process) return;
-
-		this.process.kill();
-	}
-
-	private monitorProcess(taskRunnerProcess: ChildProcess) {
-		this._runPromise = new Promise((resolve) => {
-			this.oomDetector = new NodeProcessOomDetector(taskRunnerProcess);
-
-			taskRunnerProcess.on('exit', (code) => {
-				this.onProcessExit(code, resolve);
-			});
-		});
-	}
-
-	private onProcessExit(_code: number | null, resolveFn: () => void) {
-		this.process = null;
-		this.emit('exit', { reason: this.oomDetector?.didProcessOom ? 'oom' : 'unknown' });
-		resolveFn();
-
-		if (!this.isShuttingDown) {
-			setImmediate(async () => await this.start());
-		}
-	}
-
-	private getProcessEnvVars(grantToken: string, taskBrokerUri: string) {
-		const envVars: Record<string, string> = {
-			N8N_RUNNERS_GRANT_TOKEN: grantToken,
-			N8N_RUNNERS_TASK_BROKER_URI: taskBrokerUri,
-			N8N_RUNNERS_MAX_PAYLOAD: this.runnerConfig.maxPayload.toString(),
-			N8N_RUNNERS_MAX_CONCURRENCY: this.runnerConfig.maxConcurrency.toString(),
-			N8N_RUNNERS_TASK_TIMEOUT: this.runnerConfig.taskTimeout.toString(),
-			N8N_RUNNERS_HEARTBEAT_INTERVAL: this.runnerConfig.heartbeatInterval.toString(),
-			...this.getPassthroughEnvVars(),
-		};
-
-		if (this.runnerConfig.maxOldSpaceSize) {
-			envVars.NODE_OPTIONS = `--max-old-space-size=${this.runnerConfig.maxOldSpaceSize}`;
-		}
-
-		return envVars;
-	}
-
-	private getPassthroughEnvVars() {
-		return this.passthroughEnvVars.reduce<Record<string, string>>((env, key) => {
-			if (process.env[key]) {
-				env[key] = process.env[key];
-			}
-
-			return env;
-		}, {});
-	}
-}

packages/cli/test/integration/commands/worker.cmd.test.ts

@@ -18,7 +18,7 @@ import { Publisher } from '@/scaling/pubsub/publisher.service';
 import { Subscriber } from '@/scaling/pubsub/subscriber.service';
 import { ScalingService } from '@/scaling/scaling.service';
 import { TaskBrokerServer } from '@/task-runners/task-broker/task-broker-server';
-import { TaskRunnerProcess } from '@/task-runners/task-runner-process';
+import { JsTaskRunnerProcess } from '@/task-runners/task-runner-process-js';
 import { Telemetry } from '@/telemetry';
 import { setupTestCommand } from '@test-integration/utils/test-command';
 
@@ -34,7 +34,7 @@ const messageEventBus = mockInstance(MessageEventBus);
 const logStreamingEventRelay = mockInstance(LogStreamingEventRelay);
 const scalingService = mockInstance(ScalingService);
 const taskBrokerServer = mockInstance(TaskBrokerServer);
-const taskRunnerProcess = mockInstance(TaskRunnerProcess);
+const taskRunnerProcess = mockInstance(JsTaskRunnerProcess);
 mockInstance(Publisher);
 mockInstance(Subscriber);
 mockInstance(Telemetry);

packages/cli/test/integration/task-runners/task-runner-process.test.ts

@@ -2,7 +2,7 @@ import { Container } from '@n8n/di';
 
 import { TaskBrokerWsServer } from '@/task-runners/task-broker/task-broker-ws-server';
 import { TaskBroker } from '@/task-runners/task-broker/task-broker.service';
-import { TaskRunnerProcess } from '@/task-runners/task-runner-process';
+import { JsTaskRunnerProcess } from '@/task-runners/task-runner-process-js';
 import { TaskRunnerProcessRestartLoopDetector } from '@/task-runners/task-runner-process-restart-loop-detector';
 import { retryUntil } from '@test-integration/retry-until';
 import { setupBrokerTestServer } from '@test-integration/utils/task-broker-test-server';
@@ -11,7 +11,7 @@ describe('TaskRunnerProcess', () => {
 	const { config, server: taskRunnerServer } = setupBrokerTestServer({
 		mode: 'internal',
 	});
-	const runnerProcess = Container.get(TaskRunnerProcess);
+	const runnerProcess = Container.get(JsTaskRunnerProcess);
 	const taskBroker = Container.get(TaskBroker);
 	const taskRunnerService = Container.get(TaskBrokerWsServer);