refactor(core): Simplify worker pubsub message handler (#11086)

packages/cli/src/commands/webhook.ts

@@ -112,10 +112,9 @@ export class Webhook extends BaseCommand {
 	async initOrchestration() {
 		await Container.get(OrchestrationWebhookService).init();
 
+		Container.get(PubSubHandler).init();
 		const subscriber = Container.get(Subscriber);
 		await subscriber.subscribe('n8n.commands');
 		subscriber.setCommandMessageHandler();
-
-		Container.get(PubSubHandler).init();
 	}
 }

packages/cli/src/commands/worker.ts

@@ -8,10 +8,10 @@ import { EventMessageGeneric } from '@/eventbus/event-message-classes/event-mess
 import { MessageEventBus } from '@/eventbus/message-event-bus/message-event-bus';
 import { LogStreamingEventRelay } from '@/events/relays/log-streaming.event-relay';
 import { JobProcessor } from '@/scaling/job-processor';
-import { Publisher } from '@/scaling/pubsub/publisher.service';
+import { PubSubHandler } from '@/scaling/pubsub/pubsub-handler';
+import { Subscriber } from '@/scaling/pubsub/subscriber.service';
 import type { ScalingService } from '@/scaling/scaling.service';
 import type { WorkerServerEndpointsConfig } from '@/scaling/worker-server';
-import { OrchestrationHandlerWorkerService } from '@/services/orchestration/worker/orchestration.handler.worker.service';
 import { OrchestrationWorkerService } from '@/services/orchestration/worker/orchestration.worker.service';
 
 import { BaseCommand } from './base-command';
@@ -128,12 +128,11 @@ export class Worker extends BaseCommand {
 	 */
 	async initOrchestration() {
 		await Container.get(OrchestrationWorkerService).init();
-		await Container.get(OrchestrationHandlerWorkerService).initWithOptions({
+
-			queueModeId: this.queueModeId,
+		Container.get(PubSubHandler).init();
-			publisher: Container.get(Publisher),
+		const subscriber = Container.get(Subscriber);
-			getRunningJobIds: () => this.jobProcessor.getRunningJobIds(),
+		await subscriber.subscribe('n8n.commands');
-			getRunningJobsSummary: () => this.jobProcessor.getRunningJobsSummary(),
+		subscriber.setCommandMessageHandler();
-		});
 	}
 
 	async setConcurrency() {

packages/cli/src/scaling/__tests__/pubsub-handler.test.ts

@@ -7,7 +7,9 @@ import type { ExternalSecretsManager } from '@/external-secrets/external-secrets
 import type { License } from '@/license';
 import type { CommunityPackagesService } from '@/services/community-packages.service';
 
+import type { Publisher } from '../pubsub/publisher.service';
 import { PubSubHandler } from '../pubsub/pubsub-handler';
+import type { WorkerStatus } from '../worker-status';
 
 describe('PubSubHandler', () => {
 	const eventService = new EventService();
@@ -15,13 +17,19 @@ describe('PubSubHandler', () => {
 	const eventbus = mock<MessageEventBus>();
 	const externalSecretsManager = mock<ExternalSecretsManager>();
 	const communityPackagesService = mock<CommunityPackagesService>();
+	const publisher = mock<Publisher>();
+	const workerStatus = mock<WorkerStatus>();
+
+	afterEach(() => {
+		eventService.removeAllListeners();
+	});
 
 	describe('in webhook process', () => {
 		const instanceSettings = mock<InstanceSettings>({ instanceType: 'webhook' });
 
 		it('should set up handlers in webhook process', () => {
 			// @ts-expect-error Spying on private method
-			const setupWebhookHandlersSpy = jest.spyOn(PubSubHandler.prototype, 'setupWebhookHandlers');
+			const setupHandlersSpy = jest.spyOn(PubSubHandler.prototype, 'setupHandlers');
 
 			new PubSubHandler(
 				eventService,
@@ -30,9 +38,18 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
-			expect(setupWebhookHandlersSpy).toHaveBeenCalled();
+			expect(setupHandlersSpy).toHaveBeenCalledWith({
+				'reload-license': expect.any(Function),
+				'restart-event-bus': expect.any(Function),
+				'reload-external-secrets-providers': expect.any(Function),
+				'community-package-install': expect.any(Function),
+				'community-package-update': expect.any(Function),
+				'community-package-uninstall': expect.any(Function),
+			});
 		});
 
 		it('should reload license on `reload-license` event', () => {
@@ -43,6 +60,8 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
 			eventService.emit('reload-license');
@@ -58,6 +77,8 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
 			eventService.emit('restart-event-bus');
@@ -73,6 +94,8 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
 			eventService.emit('reload-external-secrets-providers');
@@ -88,6 +111,8 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
 			eventService.emit('community-package-install', {
@@ -109,6 +134,8 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
 			eventService.emit('community-package-update', {
@@ -130,6 +157,8 @@ describe('PubSubHandler', () => {
 				eventbus,
 				externalSecretsManager,
 				communityPackagesService,
+				publisher,
+				workerStatus,
 			).init();
 
 			eventService.emit('community-package-uninstall', {
@@ -139,4 +168,123 @@ describe('PubSubHandler', () => {
 			expect(communityPackagesService.removeNpmPackage).toHaveBeenCalledWith('test-package');
 		});
 	});
+
+	describe('in worker process', () => {
+		const instanceSettings = mock<InstanceSettings>({ instanceType: 'worker' });
+
+		it('should set up handlers in worker process', () => {
+			// @ts-expect-error Spying on private method
+			const setupHandlersSpy = jest.spyOn(PubSubHandler.prototype, 'setupHandlers');
+
+			new PubSubHandler(
+				eventService,
+				instanceSettings,
+				license,
+				eventbus,
+				externalSecretsManager,
+				communityPackagesService,
+				publisher,
+				workerStatus,
+			).init();
+
+			expect(setupHandlersSpy).toHaveBeenCalledWith({
+				'reload-license': expect.any(Function),
+				'restart-event-bus': expect.any(Function),
+				'reload-external-secrets-providers': expect.any(Function),
+				'community-package-install': expect.any(Function),
+				'community-package-update': expect.any(Function),
+				'community-package-uninstall': expect.any(Function),
+				'get-worker-status': expect.any(Function),
+				'get-worker-id': expect.any(Function),
+			});
+		});
+
+		it('should reload license on `reload-license` event', () => {
+			new PubSubHandler(
+				eventService,
+				instanceSettings,
+				license,
+				eventbus,
+				externalSecretsManager,
+				communityPackagesService,
+				publisher,
+				workerStatus,
+			).init();
+
+			eventService.emit('reload-license');
+
+			expect(license.reload).toHaveBeenCalled();
+		});
+
+		it('should restart event bus on `restart-event-bus` event', () => {
+			new PubSubHandler(
+				eventService,
+				instanceSettings,
+				license,
+				eventbus,
+				externalSecretsManager,
+				communityPackagesService,
+				publisher,
+				workerStatus,
+			).init();
+
+			eventService.emit('restart-event-bus');
+
+			expect(eventbus.restart).toHaveBeenCalled();
+		});
+
+		it('should reload providers on `reload-external-secrets-providers` event', () => {
+			new PubSubHandler(
+				eventService,
+				instanceSettings,
+				license,
+				eventbus,
+				externalSecretsManager,
+				communityPackagesService,
+				publisher,
+				workerStatus,
+			).init();
+
+			eventService.emit('reload-external-secrets-providers');
+
+			expect(externalSecretsManager.reloadAllProviders).toHaveBeenCalled();
+		});
+
+		it('should generate status on `get-worker-status` event', () => {
+			new PubSubHandler(
+				eventService,
+				instanceSettings,
+				license,
+				eventbus,
+				externalSecretsManager,
+				communityPackagesService,
+				publisher,
+				workerStatus,
+			).init();
+
+			eventService.emit('get-worker-status');
+
+			expect(workerStatus.generateStatus).toHaveBeenCalled();
+		});
+
+		it('should get worker ID on `get-worker-id` event', () => {
+			new PubSubHandler(
+				eventService,
+				instanceSettings,
+				license,
+				eventbus,
+				externalSecretsManager,
+				communityPackagesService,
+				publisher,
+				workerStatus,
+			).init();
+
+			eventService.emit('get-worker-id');
+
+			expect(publisher.publishWorkerResponse).toHaveBeenCalledWith({
+				workerId: expect.any(String),
+				command: 'get-worker-id',
+			});
+		});
+	});
 });

packages/cli/src/scaling/pubsub/pubsub-handler.ts

@@ -1,12 +1,17 @@
 import { InstanceSettings } from 'n8n-core';
 import { Service } from 'typedi';
 
+import config from '@/config';
 import { MessageEventBus } from '@/eventbus/message-event-bus/message-event-bus';
 import { EventService } from '@/events/event.service';
 import type { PubSubEventMap } from '@/events/maps/pub-sub.event-map';
 import { ExternalSecretsManager } from '@/external-secrets/external-secrets-manager.ee';
 import { License } from '@/license';
+import { Publisher } from '@/scaling/pubsub/publisher.service';
 import { CommunityPackagesService } from '@/services/community-packages.service';
+import { assertNever } from '@/utils';
+
+import { WorkerStatus } from '../worker-status';
 
 /**
  * Responsible for handling events emitted from messages received via a pubsub channel.
@@ -20,10 +25,37 @@ export class PubSubHandler {
 		private readonly eventbus: MessageEventBus,
 		private readonly externalSecretsManager: ExternalSecretsManager,
 		private readonly communityPackagesService: CommunityPackagesService,
+		private readonly publisher: Publisher,
+		private readonly workerStatus: WorkerStatus,
 	) {}
 
 	init() {
-		if (this.instanceSettings.instanceType === 'webhook') this.setupWebhookHandlers();
+		switch (this.instanceSettings.instanceType) {
+			case 'webhook':
+				this.setupHandlers(this.commonHandlers);
+				break;
+			case 'worker':
+				this.setupHandlers({
+					...this.commonHandlers,
+					'get-worker-status': async () =>
+						await this.publisher.publishWorkerResponse({
+							workerId: config.getEnv('redis.queueModeId'),
+							command: 'get-worker-status',
+							payload: this.workerStatus.generateStatus(),
+						}),
+					'get-worker-id': async () =>
+						await this.publisher.publishWorkerResponse({
+							workerId: config.getEnv('redis.queueModeId'),
+							command: 'get-worker-id',
+						}),
+				});
+				break;
+			case 'main':
+				// TODO
+				break;
+			default:
+				assertNever(this.instanceSettings.instanceType);
+		}
 	}
 
 	private setupHandlers<EventNames extends keyof PubSubEventMap>(
@@ -40,10 +72,18 @@ export class PubSubHandler {
 		}
 	}
 
-	// #region Webhook process
+	/** Handlers shared by webhook and worker processes. */
-
+	private commonHandlers: {
-	private setupWebhookHandlers() {
+		[K in keyof Pick<
-		this.setupHandlers({
+			PubSubEventMap,
+			| 'reload-license'
+			| 'restart-event-bus'
+			| 'reload-external-secrets-providers'
+			| 'community-package-install'
+			| 'community-package-update'
+			| 'community-package-uninstall'
+		>]: (event: PubSubEventMap[K]) => Promise<void>;
+	} = {
 		'reload-license': async () => await this.license.reload(),
 		'restart-event-bus': async () => await this.eventbus.restart(),
 		'reload-external-secrets-providers': async () =>
@@ -54,8 +94,5 @@ export class PubSubHandler {
 			await this.communityPackagesService.installOrUpdateNpmPackage(packageName, packageVersion),
 		'community-package-uninstall': async ({ packageName }) =>
 			await this.communityPackagesService.removeNpmPackage(packageName),
-		});
+	};
-	}
-
-	// #endregion
 }

packages/cli/src/scaling/worker-status.ts

@@ -0,0 +1,43 @@
+import os from 'node:os';
+import { Service } from 'typedi';
+
+import config from '@/config';
+import { N8N_VERSION } from '@/constants';
+
+import { JobProcessor } from './job-processor';
+
+@Service()
+export class WorkerStatus {
+	constructor(private readonly jobProcessor: JobProcessor) {}
+
+	generateStatus() {
+		return {
+			workerId: config.getEnv('redis.queueModeId'),
+			runningJobsSummary: this.jobProcessor.getRunningJobsSummary(),
+			freeMem: os.freemem(),
+			totalMem: os.totalmem(),
+			uptime: process.uptime(),
+			loadAvg: os.loadavg(),
+			cpus: this.getOsCpuString(),
+			arch: os.arch(),
+			platform: os.platform(),
+			hostname: os.hostname(),
+			interfaces: Object.values(os.networkInterfaces()).flatMap((interfaces) =>
+				(interfaces ?? [])?.map((net) => ({
+					family: net.family,
+					address: net.address,
+					internal: net.internal,
+				})),
+			),
+			version: N8N_VERSION,
+		};
+	}
+
+	private getOsCpuString() {
+		const cpus = os.cpus();
+
+		if (cpus.length === 0) return 'no CPU info';
+
+		return `${cpus.length}x ${cpus[0].model} - speed: ${cpus[0].speed}`;
+	}
+}

packages/cli/src/services/orchestration/worker/handle-command-message-worker.ts

@@ -1,153 +0,0 @@
-import { jsonParse } from 'n8n-workflow';
-import os from 'node:os';
-import Container from 'typedi';
-
-import { N8N_VERSION } from '@/constants';
-import { MessageEventBus } from '@/eventbus/message-event-bus/message-event-bus';
-import { ExternalSecretsManager } from '@/external-secrets/external-secrets-manager.ee';
-import { License } from '@/license';
-import { Logger } from '@/logging/logger.service';
-import { COMMAND_PUBSUB_CHANNEL } from '@/scaling/constants';
-import type { PubSub } from '@/scaling/pubsub/pubsub.types';
-import { CommunityPackagesService } from '@/services/community-packages.service';
-
-import type { WorkerCommandReceivedHandlerOptions } from './types';
-import { debounceMessageReceiver, getOsCpuString } from '../helpers';
-
-// eslint-disable-next-line complexity
-export async function getWorkerCommandReceivedHandler(
-	messageString: string,
-	options: WorkerCommandReceivedHandlerOptions,
-) {
-	if (!messageString) return;
-
-	const logger = Container.get(Logger);
-	let message: PubSub.Command;
-	try {
-		message = jsonParse<PubSub.Command>(messageString);
-	} catch {
-		logger.debug(
-			`Received invalid message via channel ${COMMAND_PUBSUB_CHANNEL}: "${messageString}"`,
-		);
-		return;
-	}
-	if (message) {
-		logger.debug(
-			`RedisCommandHandler(worker): Received command message ${message.command} from ${message.senderId}`,
-		);
-		if (message.targets && !message.targets.includes(options.queueModeId)) {
-			return; // early return if the message is not for this worker
-		}
-		switch (message.command) {
-			case 'get-worker-status':
-				if (!debounceMessageReceiver(message, 500)) return;
-				await options.publisher.publishWorkerResponse({
-					workerId: options.queueModeId,
-					command: 'get-worker-status',
-					payload: {
-						workerId: options.queueModeId,
-						runningJobsSummary: options.getRunningJobsSummary(),
-						freeMem: os.freemem(),
-						totalMem: os.totalmem(),
-						uptime: process.uptime(),
-						loadAvg: os.loadavg(),
-						cpus: getOsCpuString(),
-						arch: os.arch(),
-						platform: os.platform(),
-						hostname: os.hostname(),
-						interfaces: Object.values(os.networkInterfaces()).flatMap((interfaces) =>
-							(interfaces ?? [])?.map((net) => ({
-								family: net.family,
-								address: net.address,
-								internal: net.internal,
-							})),
-						),
-						version: N8N_VERSION,
-					},
-				});
-				break;
-			case 'get-worker-id':
-				if (!debounceMessageReceiver(message, 500)) return;
-				await options.publisher.publishWorkerResponse({
-					workerId: options.queueModeId,
-					command: 'get-worker-id',
-				});
-				break;
-			case 'restart-event-bus':
-				if (!debounceMessageReceiver(message, 500)) return;
-				try {
-					await Container.get(MessageEventBus).restart();
-					await options.publisher.publishWorkerResponse({
-						workerId: options.queueModeId,
-						command: 'restart-event-bus',
-						payload: {
-							result: 'success',
-						},
-					});
-				} catch (error) {
-					await options.publisher.publishWorkerResponse({
-						workerId: options.queueModeId,
-						command: 'restart-event-bus',
-						payload: {
-							result: 'error',
-							error: (error as Error).message,
-						},
-					});
-				}
-				break;
-			case 'reload-external-secrets-providers':
-				if (!debounceMessageReceiver(message, 500)) return;
-				try {
-					await Container.get(ExternalSecretsManager).reloadAllProviders();
-					await options.publisher.publishWorkerResponse({
-						workerId: options.queueModeId,
-						command: 'reload-external-secrets-providers',
-						payload: {
-							result: 'success',
-						},
-					});
-				} catch (error) {
-					await options.publisher.publishWorkerResponse({
-						workerId: options.queueModeId,
-						command: 'reload-external-secrets-providers',
-						payload: {
-							result: 'error',
-							error: (error as Error).message,
-						},
-					});
-				}
-				break;
-			case 'community-package-install':
-			case 'community-package-update':
-			case 'community-package-uninstall':
-				if (!debounceMessageReceiver(message, 500)) return;
-				const { packageName } = message.payload;
-				const communityPackagesService = Container.get(CommunityPackagesService);
-				if (message.command === 'community-package-uninstall') {
-					await communityPackagesService.removeNpmPackage(packageName);
-				} else {
-					await communityPackagesService.installOrUpdateNpmPackage(
-						packageName,
-						message.payload.packageVersion,
-					);
-				}
-				break;
-			case 'reload-license':
-				if (!debounceMessageReceiver(message, 500)) return;
-				await Container.get(License).reload();
-				break;
-			default:
-				if (
-					message.command === 'relay-execution-lifecycle-event' ||
-					message.command === 'clear-test-webhooks'
-				) {
-					break; // meant only for main
-				}
-
-				logger.debug(
-					`Received unknown command via channel ${COMMAND_PUBSUB_CHANNEL}: "${message.command}"`,
-				);
-				break;
-		}
-	}
-}

packages/cli/src/services/orchestration/worker/orchestration.handler.worker.service.ts

@@ -1,22 +0,0 @@
-import { Service } from 'typedi';
-
-import { Subscriber } from '@/scaling/pubsub/subscriber.service';
-
-import { getWorkerCommandReceivedHandler } from './handle-command-message-worker';
-import type { WorkerCommandReceivedHandlerOptions } from './types';
-import { OrchestrationHandlerService } from '../../orchestration.handler.base.service';
-
-@Service()
-export class OrchestrationHandlerWorkerService extends OrchestrationHandlerService {
-	constructor(private readonly subscriber: Subscriber) {
-		super();
-	}
-
-	async initSubscriber(options: WorkerCommandReceivedHandlerOptions) {
-		await this.subscriber.subscribe('n8n.commands');
-
-		this.subscriber.setMessageHandler('n8n.commands', async (message: string) => {
-			await getWorkerCommandReceivedHandler(message, options);
-		});
-	}
-}

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

@@ -11,8 +11,8 @@ import { ExternalSecretsManager } from '@/external-secrets/external-secrets-mana
 import { License } from '@/license';
 import { LoadNodesAndCredentials } from '@/load-nodes-and-credentials';
 import { Publisher } from '@/scaling/pubsub/publisher.service';
+import { Subscriber } from '@/scaling/pubsub/subscriber.service';
 import { ScalingService } from '@/scaling/scaling.service';
-import { OrchestrationHandlerWorkerService } from '@/services/orchestration/worker/orchestration.handler.worker.service';
 import { OrchestrationWorkerService } from '@/services/orchestration/worker/orchestration.worker.service';
 import { setupTestCommand } from '@test-integration/utils/test-command';
 
@@ -27,10 +27,10 @@ const externalSecretsManager = mockInstance(ExternalSecretsManager);
 const license = mockInstance(License, { loadCertStr: async () => '' });
 const messageEventBus = mockInstance(MessageEventBus);
 const logStreamingEventRelay = mockInstance(LogStreamingEventRelay);
-const orchestrationHandlerWorkerService = mockInstance(OrchestrationHandlerWorkerService);
 const scalingService = mockInstance(ScalingService);
 const orchestrationWorkerService = mockInstance(OrchestrationWorkerService);
 mockInstance(Publisher);
+mockInstance(Subscriber);
 
 const command = setupTestCommand(Worker);
 
@@ -48,6 +48,5 @@ test('worker initializes all its components', async () => {
 	expect(scalingService.setupWorker).toHaveBeenCalledTimes(1);
 	expect(logStreamingEventRelay.init).toHaveBeenCalledTimes(1);
 	expect(orchestrationWorkerService.init).toHaveBeenCalledTimes(1);
-	expect(orchestrationHandlerWorkerService.initWithOptions).toHaveBeenCalledTimes(1);
 	expect(messageEventBus.send).toHaveBeenCalledTimes(1);
 });