refactor(core): Move queueModeId as hostId to InstanceSettings (#11262)

packages/cli/src/abstract-server.ts

@@ -5,7 +5,6 @@ import { engine as expressHandlebars } from 'express-handlebars';
 import { readFile } from 'fs/promises';
 import type { Server } from 'http';
 import isbot from 'isbot';
-import type { InstanceType } from 'n8n-core';
 import { Container, Service } from 'typedi';
 
 import config from '@/config';
@@ -22,7 +21,6 @@ import { TestWebhooks } from '@/webhooks/test-webhooks';
 import { WaitingWebhooks } from '@/webhooks/waiting-webhooks';
 import { createWebhookHandlerFor } from '@/webhooks/webhook-request-handler';
 
-import { generateHostInstanceId } from './databases/utils/generators';
 import { ServiceUnavailableError } from './errors/response-errors/service-unavailable.error';
 
 @Service()
@@ -61,7 +59,7 @@ export abstract class AbstractServer {
 
 	readonly uniqueInstanceId: string;
 
-	constructor(instanceType: Exclude<InstanceType, 'worker'>) {
+	constructor() {
 		this.app = express();
 		this.app.disable('x-powered-by');
 
@@ -85,8 +83,6 @@ export abstract class AbstractServer {
 		this.endpointWebhookTest = this.globalConfig.endpoints.webhookTest;
 		this.endpointWebhookWaiting = this.globalConfig.endpoints.webhookWaiting;
 
-		this.uniqueInstanceId = generateHostInstanceId(instanceType);
-
 		this.logger = Container.get(Logger);
 	}
 

packages/cli/src/commands/base-command.ts

@@ -19,7 +19,6 @@ import type { AbstractServer } from '@/abstract-server';
 import config from '@/config';
 import { LICENSE_FEATURES, inDevelopment, inTest } from '@/constants';
 import * as CrashJournal from '@/crash-journal';
-import { generateHostInstanceId } from '@/databases/utils/generators';
 import * as Db from '@/db';
 import { getDataDeduplicationService } from '@/deduplication';
 import { initErrorHandling } from '@/error-reporting';
@@ -45,8 +44,6 @@ export abstract class BaseCommand extends Command {
 
 	protected instanceSettings: InstanceSettings = Container.get(InstanceSettings);
 
-	queueModeId: string;
-
 	protected server?: AbstractServer;
 
 	protected shutdownService: ShutdownService = Container.get(ShutdownService);
@@ -133,16 +130,6 @@ export abstract class BaseCommand extends Command {
 		await Container.get(TelemetryEventRelay).init();
 	}
 
-	protected setInstanceQueueModeId() {
-		if (config.get('redis.queueModeId')) {
-			this.queueModeId = config.get('redis.queueModeId');
-			return;
-		}
-		// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
-		this.queueModeId = generateHostInstanceId(this.instanceSettings.instanceType!);
-		config.set('redis.queueModeId', this.queueModeId);
-	}
-
 	protected async stopProcess() {
 		// This needs to be overridden
 	}

packages/cli/src/commands/start.ts

@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/no-unsafe-call */
 /* eslint-disable @typescript-eslint/no-unsafe-member-access */
-import { Flags, type Config } from '@oclif/core';
+import { Flags } from '@oclif/core';
 import glob from 'fast-glob';
 import { createReadStream, createWriteStream, existsSync } from 'fs';
 import { mkdir } from 'fs/promises';
@@ -70,11 +70,6 @@ export class Start extends BaseCommand {
 
 	override needsCommunityPackages = true;
 
-	constructor(argv: string[], cmdConfig: Config) {
-		super(argv, cmdConfig);
-		this.setInstanceQueueModeId();
-	}
-
 	/**
 	 * Opens the UI in browser
 	 */
@@ -176,7 +171,7 @@ export class Start extends BaseCommand {
 		if (config.getEnv('executions.mode') === 'queue') {
 			const scopedLogger = this.logger.withScope('scaling');
 			scopedLogger.debug('Starting main instance in scaling mode');
-			scopedLogger.debug(`Host ID: ${this.queueModeId}`);
+			scopedLogger.debug(`Host ID: ${this.instanceSettings.hostId}`);
 		}
 
 		const { flags } = await this.parse(Start);

packages/cli/src/commands/webhook.ts

@@ -1,4 +1,4 @@
-import { Flags, type Config } from '@oclif/core';
+import { Flags } from '@oclif/core';
 import { ApplicationError } from 'n8n-workflow';
 import { Container } from 'typedi';
 
@@ -24,14 +24,6 @@ export class Webhook extends BaseCommand {
 
 	override needsCommunityPackages = true;
 
-	constructor(argv: string[], cmdConfig: Config) {
-		super(argv, cmdConfig);
-		if (this.queueModeId) {
-			this.logger.debug(`Webhook Instance queue mode id: ${this.queueModeId}`);
-		}
-		this.setInstanceQueueModeId();
-	}
-
 	/**
 	 * Stops n8n in a graceful way.
 	 * Make for example sure that all the webhooks from third party services
@@ -71,8 +63,8 @@ export class Webhook extends BaseCommand {
 		await this.initCrashJournal();
 		this.logger.debug('Crash journal initialized');
 
-		this.logger.info('Initializing n8n webhook process');
+		this.logger.info('Starting n8n webhook process...');
-		this.logger.debug(`Queue mode id: ${this.queueModeId}`);
+		this.logger.debug(`Host ID: ${this.instanceSettings.hostId}`);
 
 		await super.init();
 
@@ -100,7 +92,6 @@ export class Webhook extends BaseCommand {
 		const { ScalingService } = await import('@/scaling/scaling.service');
 		await Container.get(ScalingService).setupQueue();
 		await this.server.start();
-		this.logger.debug(`Webhook listener ID: ${this.server.uniqueInstanceId}`);
 		this.logger.info('Webhook listener waiting for requests.');
 
 		// Make sure that the process does not close

packages/cli/src/commands/worker.ts

@@ -70,8 +70,6 @@ export class Worker extends BaseCommand {
 		super(argv, cmdConfig);
 
 		this.logger = Container.get(Logger).withScope('scaling');
-
-		this.setInstanceQueueModeId();
 	}
 
 	async init() {
@@ -86,7 +84,7 @@ export class Worker extends BaseCommand {
 		await this.initCrashJournal();
 
 		this.logger.debug('Starting n8n worker...');
-		this.logger.debug(`Host ID: ${this.queueModeId}`);
+		this.logger.debug(`Host ID: ${this.instanceSettings.hostId}`);
 
 		await this.setConcurrency();
 		await super.init();
@@ -111,7 +109,7 @@ export class Worker extends BaseCommand {
 			new EventMessageGeneric({
 				eventName: 'n8n.worker.started',
 				payload: {
-					workerId: this.queueModeId,
+					workerId: this.instanceSettings.hostId,
 				},
 			}),
 		);
@@ -130,7 +128,7 @@ export class Worker extends BaseCommand {
 
 	async initEventBus() {
 		await Container.get(MessageEventBus).initialize({
-			workerId: this.queueModeId,
+			workerId: this.instanceSettings.hostId,
 		});
 		Container.get(LogStreamingEventRelay).init();
 	}

packages/cli/src/config/schema.ts

@@ -491,11 +491,6 @@ export const schema = {
 			default: 'n8n',
 			env: 'N8N_REDIS_KEY_PREFIX',
 		},
-		queueModeId: {
-			doc: 'Unique ID for this n8n instance, is usually set automatically by n8n during startup',
-			format: String,
-			default: '',
-		},
 	},
 
 	/**

packages/cli/src/scaling/__tests__/publisher.service.test.ts

@@ -1,8 +1,8 @@
 import type { Redis as SingleNodeClient } from 'ioredis';
 import { mock } from 'jest-mock-extended';
+import type { InstanceSettings } from 'n8n-core';
 
 import config from '@/config';
-import { generateNanoId } from '@/databases/utils/generators';
 import type { RedisClientService } from '@/services/redis-client.service';
 import { mockLogger } from '@test/mocking';
 
@@ -10,28 +10,26 @@ import { Publisher } from '../pubsub/publisher.service';
 import type { PubSub } from '../pubsub/pubsub.types';
 
 describe('Publisher', () => {
-	let queueModeId: string;
-
 	beforeEach(() => {
 		config.set('executions.mode', 'queue');
-		queueModeId = generateNanoId();
-		config.set('redis.queueModeId', queueModeId);
 	});
 
 	const client = mock<SingleNodeClient>();
 	const logger = mockLogger();
+	const hostId = 'main-bnxa1riryKUNHtln';
+	const instanceSettings = mock<InstanceSettings>({ hostId });
 	const redisClientService = mock<RedisClientService>({ createClient: () => client });
 
 	describe('constructor', () => {
 		it('should init Redis client in scaling mode', () => {
-			const publisher = new Publisher(logger, redisClientService);
+			const publisher = new Publisher(logger, redisClientService, instanceSettings);
 
 			expect(publisher.getClient()).toEqual(client);
 		});
 
 		it('should not init Redis client in regular mode', () => {
 			config.set('executions.mode', 'regular');
-			const publisher = new Publisher(logger, redisClientService);
+			const publisher = new Publisher(logger, redisClientService, instanceSettings);
 
 			expect(publisher.getClient()).toBeUndefined();
 		});
@@ -39,7 +37,7 @@ describe('Publisher', () => {
 
 	describe('shutdown', () => {
 		it('should disconnect Redis client', () => {
-			const publisher = new Publisher(logger, redisClientService);
+			const publisher = new Publisher(logger, redisClientService, instanceSettings);
 			publisher.shutdown();
 			expect(client.disconnect).toHaveBeenCalled();
 		});
@@ -47,21 +45,21 @@ describe('Publisher', () => {
 
 	describe('publishCommand', () => {
 		it('should publish command into `n8n.commands` pubsub channel', async () => {
-			const publisher = new Publisher(logger, redisClientService);
+			const publisher = new Publisher(logger, redisClientService, instanceSettings);
 			const msg = mock<PubSub.Command>({ command: 'reload-license' });
 
 			await publisher.publishCommand(msg);
 
 			expect(client.publish).toHaveBeenCalledWith(
 				'n8n.commands',
-				JSON.stringify({ ...msg, senderId: queueModeId, selfSend: false, debounce: true }),
+				JSON.stringify({ ...msg, senderId: hostId, selfSend: false, debounce: true }),
 			);
 		});
 	});
 
 	describe('publishWorkerResponse', () => {
 		it('should publish worker response into `n8n.worker-response` pubsub channel', async () => {
-			const publisher = new Publisher(logger, redisClientService);
+			const publisher = new Publisher(logger, redisClientService, instanceSettings);
 			const msg = mock<PubSub.WorkerResponse>({
 				response: 'response-to-get-worker-status',
 			});

packages/cli/src/scaling/__tests__/subscriber.service.test.ts

@@ -17,14 +17,14 @@ describe('Subscriber', () => {
 
 	describe('constructor', () => {
 		it('should init Redis client in scaling mode', () => {
-			const subscriber = new Subscriber(mock(), redisClientService, mock());
+			const subscriber = new Subscriber(mock(), redisClientService, mock(), mock());
 
 			expect(subscriber.getClient()).toEqual(client);
 		});
 
 		it('should not init Redis client in regular mode', () => {
 			config.set('executions.mode', 'regular');
-			const subscriber = new Subscriber(mock(), redisClientService, mock());
+			const subscriber = new Subscriber(mock(), redisClientService, mock(), mock());
 
 			expect(subscriber.getClient()).toBeUndefined();
 		});
@@ -32,7 +32,7 @@ describe('Subscriber', () => {
 
 	describe('shutdown', () => {
 		it('should disconnect Redis client', () => {
-			const subscriber = new Subscriber(mock(), redisClientService, mock());
+			const subscriber = new Subscriber(mock(), redisClientService, mock(), mock());
 			subscriber.shutdown();
 			expect(client.disconnect).toHaveBeenCalled();
 		});
@@ -40,7 +40,7 @@ describe('Subscriber', () => {
 
 	describe('subscribe', () => {
 		it('should subscribe to pubsub channel', async () => {
-			const subscriber = new Subscriber(mock(), redisClientService, mock());
+			const subscriber = new Subscriber(mock(), redisClientService, mock(), mock());
 
 			await subscriber.subscribe('n8n.commands');
 

packages/cli/src/scaling/job-processor.ts

@@ -1,5 +1,5 @@
 import type { RunningJobSummary } from '@n8n/api-types';
-import { WorkflowExecute } from 'n8n-core';
+import { InstanceSettings, WorkflowExecute } from 'n8n-core';
 import { BINARY_ENCODING, ApplicationError, Workflow } from 'n8n-workflow';
 import type { ExecutionStatus, IExecuteResponsePromiseData, IRun } from 'n8n-workflow';
 import type PCancelable from 'p-cancelable';
@@ -33,6 +33,7 @@ export class JobProcessor {
 		private readonly executionRepository: ExecutionRepository,
 		private readonly workflowRepository: WorkflowRepository,
 		private readonly nodeTypes: NodeTypes,
+		private readonly instanceSettings: InstanceSettings,
 	) {
 		this.logger = this.logger.withScope('scaling');
 	}
@@ -120,7 +121,7 @@ export class JobProcessor {
 					kind: 'respond-to-webhook',
 					executionId,
 					response: this.encodeWebhookResponse(response),
-					workerId: config.getEnv('redis.queueModeId'),
+					workerId: this.instanceSettings.hostId,
 				};
 
 				await job.progress(msg);
@@ -173,7 +174,7 @@ export class JobProcessor {
 		const msg: JobFinishedMessage = {
 			kind: 'job-finished',
 			executionId,
-			workerId: config.getEnv('redis.queueModeId'),
+			workerId: this.instanceSettings.hostId,
 		};
 
 		await job.progress(msg);

packages/cli/src/scaling/pubsub/publisher.service.ts

@@ -1,4 +1,5 @@
 import type { Redis as SingleNodeClient, Cluster as MultiNodeClient } from 'ioredis';
+import { InstanceSettings } from 'n8n-core';
 import { Service } from 'typedi';
 
 import config from '@/config';
@@ -20,6 +21,7 @@ export class Publisher {
 	constructor(
 		private readonly logger: Logger,
 		private readonly redisClientService: RedisClientService,
+		private readonly instanceSettings: InstanceSettings,
 	) {
 		// @TODO: Once this class is only ever initialized in scaling mode, throw in the next line instead.
 		if (config.getEnv('executions.mode') !== 'queue') return;
@@ -48,7 +50,7 @@ export class Publisher {
 			'n8n.commands',
 			JSON.stringify({
 				...msg,
-				senderId: config.getEnv('redis.queueModeId'),
+				senderId: this.instanceSettings.hostId,
 				selfSend: SELF_SEND_COMMANDS.has(msg.command),
 				debounce: !IMMEDIATE_COMMANDS.has(msg.command),
 			}),

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

@@ -3,7 +3,6 @@ import { ensureError } from 'n8n-workflow';
 import { Service } from 'typedi';
 
 import { ActiveWorkflowManager } from '@/active-workflow-manager';
-import config from '@/config';
 import { WorkflowRepository } from '@/databases/repositories/workflow.repository';
 import { MessageEventBus } from '@/eventbus/message-event-bus/message-event-bus';
 import { EventService } from '@/events/event.service';
@@ -49,7 +48,7 @@ export class PubSubHandler {
 					...this.commonHandlers,
 					'get-worker-status': async () =>
 						await this.publisher.publishWorkerResponse({
-							senderId: config.getEnv('redis.queueModeId'),
+							senderId: this.instanceSettings.hostId,
 							response: 'response-to-get-worker-status',
 							payload: this.workerStatusService.generateStatus(),
 						}),

packages/cli/src/scaling/pubsub/subscriber.service.ts

@@ -1,5 +1,6 @@
 import type { Redis as SingleNodeClient, Cluster as MultiNodeClient } from 'ioredis';
 import debounce from 'lodash/debounce';
+import { InstanceSettings } from 'n8n-core';
 import { jsonParse } from 'n8n-workflow';
 import { Service } from 'typedi';
 
@@ -21,6 +22,7 @@ export class Subscriber {
 		private readonly logger: Logger,
 		private readonly redisClientService: RedisClientService,
 		private readonly eventService: EventService,
+		private readonly instanceSettings: InstanceSettings,
 	) {
 		// @TODO: Once this class is only ever initialized in scaling mode, throw in the next line instead.
 		if (config.getEnv('executions.mode') !== 'queue') return;
@@ -77,12 +79,12 @@ export class Subscriber {
 			return null;
 		}
 
-		const queueModeId = config.getEnv('redis.queueModeId');
+		const { hostId } = this.instanceSettings;
 
 		if (
 			'command' in msg &&
 			!msg.selfSend &&
-			(msg.senderId === queueModeId || (msg.targets && !msg.targets.includes(queueModeId)))
+			(msg.senderId === hostId || (msg.targets && !msg.targets.includes(hostId)))
 		) {
 			return null;
 		}

packages/cli/src/scaling/scaling.service.ts

@@ -112,7 +112,7 @@ export class ScalingService {
 		const msg: JobFailedMessage = {
 			kind: 'job-failed',
 			executionId,
-			workerId: config.getEnv('redis.queueModeId'),
+			workerId: this.instanceSettings.hostId,
 			errorMsg: error.message,
 		};
 

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

@@ -1,19 +1,22 @@
 import type { WorkerStatus } from '@n8n/api-types';
+import { InstanceSettings } from 'n8n-core';
 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 WorkerStatusService {
-	constructor(private readonly jobProcessor: JobProcessor) {}
+	constructor(
+		private readonly jobProcessor: JobProcessor,
+		private readonly instanceSettings: InstanceSettings,
+	) {}
 
 	generateStatus(): WorkerStatus {
 		return {
-			senderId: config.getEnv('redis.queueModeId'),
+			senderId: this.instanceSettings.hostId,
 			runningJobsSummary: this.jobProcessor.getRunningJobsSummary(),
 			freeMem: os.freemem(),
 			totalMem: os.totalmem(),

packages/cli/src/server.ts

@@ -79,8 +79,9 @@ export class Server extends AbstractServer {
 		private readonly orchestrationService: OrchestrationService,
 		private readonly postHogClient: PostHogClient,
 		private readonly eventService: EventService,
+		private readonly instanceSettings: InstanceSettings,
 	) {
-		super('main');
+		super();
 
 		this.testWebhooksEnabled = true;
 		this.webhooksEnabled = !this.globalConfig.endpoints.disableProductionWebhooksOnMainProcess;
@@ -97,7 +98,7 @@ export class Server extends AbstractServer {
 		this.endpointPresetCredentials = this.globalConfig.credentials.overwrite.endpoint;
 
 		await super.start();
-		this.logger.debug(`Server ID: ${this.uniqueInstanceId}`);
+		this.logger.debug(`Server ID: ${this.instanceSettings.hostId}`);
 
 		if (inDevelopment && process.env.N8N_DEV_RELOAD === 'true') {
 			void this.loadNodesAndCredentials.setupHotReload();

packages/cli/src/services/__tests__/orchestration.service.test.ts

@@ -23,15 +23,11 @@ redisClientService.createClient.mockReturnValue(mockRedisClient);
 const os = Container.get(OrchestrationService);
 mockInstance(ActiveWorkflowManager);
 
-let queueModeId: string;
-
 describe('Orchestration Service', () => {
 	mockInstance(Push);
 	mockInstance(ExternalSecretsManager);
 
 	beforeAll(async () => {
-		queueModeId = config.get('redis.queueModeId');
-
 		// @ts-expect-error readonly property
 		instanceSettings.instanceType = 'main';
 	});
@@ -48,7 +44,6 @@ describe('Orchestration Service', () => {
 		await os.init();
 		// @ts-expect-error Private field
 		expect(os.publisher).toBeDefined();
-		expect(queueModeId).toBeDefined();
 	});
 
 	describe('shouldAddWebhooks', () => {

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

@@ -43,10 +43,6 @@ export class OrchestrationService {
 		return !this.isMultiMainSetupEnabled;
 	}
 
-	get instanceId() {
-		return config.getEnv('redis.queueModeId');
-	}
-
 	sanityCheck() {
 		return this.isInitialized && config.get('executions.mode') === 'queue';
 	}
@@ -94,7 +90,7 @@ export class OrchestrationService {
 		if (!this.sanityCheck()) return;
 
 		this.logger.debug(
-			`[Instance ID ${this.instanceId}] Publishing command "${commandKey}"`,
+			`[Instance ID ${this.instanceSettings.hostId}] Publishing command "${commandKey}"`,
 			payload,
 		);
 

packages/cli/src/services/orchestration/main/multi-main-setup.ee.ts

@@ -24,10 +24,6 @@ export class MultiMainSetup extends TypedEmitter<MultiMainEvents> {
 		super();
 	}
 
-	get instanceId() {
-		return config.getEnv('redis.queueModeId');
-	}
-
 	private leaderKey: string;
 
 	private readonly leaderKeyTtl = config.getEnv('multiMainSetup.ttl');
@@ -57,16 +53,18 @@ export class MultiMainSetup extends TypedEmitter<MultiMainEvents> {
 	private async checkLeader() {
 		const leaderId = await this.publisher.get(this.leaderKey);
 
-		if (leaderId === this.instanceId) {
+		const { hostId } = this.instanceSettings;
-			this.logger.debug(`[Instance ID ${this.instanceId}] Leader is this instance`);
+
+		if (leaderId === hostId) {
+			this.logger.debug(`[Instance ID ${hostId}] Leader is this instance`);
 
 			await this.publisher.setExpiration(this.leaderKey, this.leaderKeyTtl);
 
 			return;
 		}
 
-		if (leaderId && leaderId !== this.instanceId) {
+		if (leaderId && leaderId !== hostId) {
-			this.logger.debug(`[Instance ID ${this.instanceId}] Leader is other instance "${leaderId}"`);
+			this.logger.debug(`[Instance ID ${hostId}] Leader is other instance "${leaderId}"`);
 
 			if (this.instanceSettings.isLeader) {
 				this.instanceSettings.markAsFollower();
@@ -81,7 +79,7 @@ export class MultiMainSetup extends TypedEmitter<MultiMainEvents> {
 
 		if (!leaderId) {
 			this.logger.debug(
-				`[Instance ID ${this.instanceId}] Leadership vacant, attempting to become leader...`,
+				`[Instance ID ${hostId}] Leadership vacant, attempting to become leader...`,
 			);
 
 			this.instanceSettings.markAsFollower();
@@ -96,11 +94,13 @@ export class MultiMainSetup extends TypedEmitter<MultiMainEvents> {
 	}
 
 	private async tryBecomeLeader() {
+		const { hostId } = this.instanceSettings;
+
 		// this can only succeed if leadership is currently vacant
-		const keySetSuccessfully = await this.publisher.setIfNotExists(this.leaderKey, this.instanceId);
+		const keySetSuccessfully = await this.publisher.setIfNotExists(this.leaderKey, hostId);
 
 		if (keySetSuccessfully) {
-			this.logger.debug(`[Instance ID ${this.instanceId}] Leader is now this instance`);
+			this.logger.debug(`[Instance ID ${hostId}] Leader is now this instance`);
 
 			this.instanceSettings.markAsLeader();
 

packages/cli/src/services/orchestration/main/types.ts

@@ -1,6 +1,6 @@
 import type { Publisher } from '@/scaling/pubsub/publisher.service';
 
 export type MainResponseReceivedHandlerOptions = {
-	queueModeId: string;
+	hostId: string;
 	publisher: Publisher;
 };

packages/cli/src/services/orchestration/worker/types.ts

@@ -3,7 +3,7 @@ import type { RunningJobSummary } from '@n8n/api-types';
 import type { Publisher } from '@/scaling/pubsub/publisher.service';
 
 export interface WorkerCommandReceivedHandlerOptions {
-	queueModeId: string;
+	hostId: string;
 	publisher: Publisher;
 	getRunningJobIds: () => Array<string | number>;
 	getRunningJobsSummary: () => RunningJobSummary[];

packages/cli/src/webhooks/webhook-server.ts

@@ -3,8 +3,4 @@ import { Service } from 'typedi';
 import { AbstractServer } from '@/abstract-server';
 
 @Service()
-export class WebhookServer extends AbstractServer {
+export class WebhookServer extends AbstractServer {}
-	constructor() {
-		super('webhook');
-	}
-}

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

@@ -48,10 +48,8 @@ const command = setupTestCommand(Worker);
 test('worker initializes all its components', async () => {
 	config.set('executions.mode', 'regular'); // should be overridden
 
-	const worker = await command.run();
+	await command.run();
-	expect(worker.queueModeId).toBeDefined();
+
-	expect(worker.queueModeId).toContain('worker');
-	expect(worker.queueModeId.length).toBeGreaterThan(15);
 	expect(license.init).toHaveBeenCalledTimes(1);
 	expect(binaryDataService.init).toHaveBeenCalledTimes(1);
 	expect(externalHooks.init).toHaveBeenCalledTimes(1);

packages/core/package.json

@@ -36,6 +36,7 @@
     "@types/xml2js": "catalog:"
   },
   "dependencies": {
+    "@langchain/core": "catalog:",
     "@n8n/client-oauth2": "workspace:*",
     "aws4": "1.11.0",
     "axios": "catalog:",
@@ -45,10 +46,10 @@
     "file-type": "16.5.4",
     "form-data": "catalog:",
     "lodash": "catalog:",
-    "@langchain/core": "catalog:",
     "luxon": "catalog:",
     "mime-types": "2.1.35",
     "n8n-workflow": "workspace:*",
+    "nanoid": "catalog:",
     "oauth-1.0a": "2.2.6",
     "p-cancelable": "2.1.1",
     "pretty-bytes": "5.6.0",

packages/core/src/InstanceSettings.ts

@@ -1,9 +1,12 @@
 import { createHash, randomBytes } from 'crypto';
 import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'fs';
-import { ApplicationError, jsonParse } from 'n8n-workflow';
+import { ApplicationError, jsonParse, ALPHABET } from 'n8n-workflow';
+import { customAlphabet } from 'nanoid';
 import path from 'path';
 import { Service } from 'typedi';
 
+const nanoid = customAlphabet(ALPHABET, 16);
+
 interface ReadOnlySettings {
 	encryptionKey: string;
 }
@@ -40,6 +43,12 @@ export class InstanceSettings {
 
 	private settings = this.loadOrCreate();
 
+	/**
+	 * Fixed ID of this n8n instance, for telemetry.
+	 * Derived from encryption key. Do not confuse with `hostId`.
+	 *
+	 * @example '258fce876abf5ea60eb86a2e777e5e190ff8f3e36b5b37aafec6636c31d4d1f9'
+	 */
 	readonly instanceId = this.generateInstanceId();
 
 	readonly instanceType: InstanceType;
@@ -49,6 +58,8 @@ export class InstanceSettings {
 		this.instanceType = ['webhook', 'worker'].includes(command)
 			? (command as InstanceType)
 			: 'main';
+
+		this.hostId = `${this.instanceType}-${nanoid()}`;
 	}
 
 	/**
@@ -61,6 +72,16 @@ export class InstanceSettings {
 	 */
 	instanceRole: InstanceRole = 'unset';
 
+	/**
+	 * Transient ID of this n8n instance, for scaling mode.
+	 * Reset on restart. Do not confuse with `instanceId`.
+	 *
+	 * @example 'main-bnxa1riryKUNHtln'
+	 * @example 'worker-nDJR0FnSd2Vf6DB5'
+	 * @example 'webhook-jxQ7AO8IzxEtfW1F'
+	 */
+	readonly hostId: string;
+
 	get isLeader() {
 		return this.instanceRole === 'leader';
 	}

packages/core/test/InstanceSettings.test.ts

@@ -69,4 +69,19 @@ describe('InstanceSettings', () => {
 			);
 		});
 	});
+
+	describe('constructor', () => {
+		it('should generate a `hostId`', () => {
+			const encryptionKey = 'test_key';
+			process.env.N8N_ENCRYPTION_KEY = encryptionKey;
+			jest.spyOn(fs, 'existsSync').mockReturnValueOnce(true);
+			jest.spyOn(fs, 'readFileSync').mockReturnValueOnce(JSON.stringify({ encryptionKey }));
+
+			const settings = new InstanceSettings();
+
+			const [instanceType, nanoid] = settings.hostId.split('-');
+			expect(instanceType).toEqual('main');
+			expect(nanoid).toHaveLength(16); // e.g. sDX6ZPc0bozv66zM
+		});
+	});
 });

pnpm-lock.yaml

@@ -1112,6 +1112,9 @@ importers:
       n8n-workflow:
         specifier: workspace:*
         version: link:../workflow
+      nanoid:
+        specifier: 'catalog:'
+        version: 3.3.6
       oauth-1.0a:
         specifier: 2.2.6
         version: 2.2.6
@@ -2206,7 +2209,7 @@ packages:
   '@azure/core-http@3.0.4':
     resolution: {integrity: sha512-Fok9VVhMdxAFOtqiiAtg74fL0UJkt0z3D+ouUUxcRLzZNBioPRAMJFVxiWoJljYpXsRi4GDQHzQHDc9AiYaIUQ==}
     engines: {node: '>=14.0.0'}
-    deprecated: This package is no longer supported. Please migrate to use @azure/core-rest-pipeline
+    deprecated: deprecating as we migrated to core v2
 
   '@azure/core-lro@2.4.0':
     resolution: {integrity: sha512-F65+rYkll1dpw3RGm8/SSiSj+/QkMeYDanzS/QKlM1dmuneVyXbO46C88V1MRHluLGdMP6qfD3vDRYALn0z0tQ==}
@@ -5769,6 +5772,9 @@ packages:
   axios-retry@3.7.0:
     resolution: {integrity: sha512-ZTnCkJbRtfScvwiRnoVskFAfvU0UG3xNcsjwTR0mawSbIJoothxn67gKsMaNAFHRXJ1RmuLhmZBzvyXi3+9WyQ==}
 
+  axios@1.7.3:
+    resolution: {integrity: sha512-Ar7ND9pU99eJ9GpoGQKhKf58GpUOgnzuaB7ueNQ5BMi0p+LZ5oaEnfF999fAArcTIBwXTCHAmGcHOZJaWPq9Nw==}
+
   axios@1.7.4:
     resolution: {integrity: sha512-DukmaFRnY6AzAALSH4J2M3k6PkaC+MfaAGdEERRWcC9q3/TWQwLpHR8ZRLKTdQ3aBDL64EdluRDjJqKw+BPZEw==}
 
@@ -14925,7 +14931,7 @@ snapshots:
 
   '@n8n/localtunnel@3.0.0':
     dependencies:
-      axios: 1.7.7(debug@4.3.6)
+      axios: 1.7.3(debug@4.3.6)
       debug: 4.3.6(supports-color@8.1.1)
     transitivePeerDependencies:
       - supports-color
@@ -17630,6 +17636,14 @@ snapshots:
       '@babel/runtime': 7.24.7
       is-retry-allowed: 2.2.0
 
+  axios@1.7.3(debug@4.3.6):
+    dependencies:
+      follow-redirects: 1.15.6(debug@4.3.6)
+      form-data: 4.0.0
+      proxy-from-env: 1.1.0
+    transitivePeerDependencies:
+      - debug
+
   axios@1.7.4:
     dependencies:
       follow-redirects: 1.15.6(debug@4.3.6)
@@ -17646,14 +17660,6 @@ snapshots:
     transitivePeerDependencies:
       - debug
 
-  axios@1.7.7(debug@4.3.6):
-    dependencies:
-      follow-redirects: 1.15.6(debug@4.3.6)
-      form-data: 4.0.0
-      proxy-from-env: 1.1.0
-    transitivePeerDependencies:
-      - debug
-
   axios@1.7.7(debug@4.3.7):
     dependencies:
       follow-redirects: 1.15.6(debug@4.3.7)
@@ -19293,7 +19299,7 @@ snapshots:
 
   eslint-import-resolver-node@0.3.9:
     dependencies:
-      debug: 3.2.7(supports-color@8.1.1)
+      debug: 3.2.7(supports-color@5.5.0)
       is-core-module: 2.13.1
       resolve: 1.22.8
     transitivePeerDependencies:
@@ -19318,7 +19324,7 @@ snapshots:
 
   eslint-module-utils@2.8.0(@typescript-eslint/parser@7.2.0(eslint@8.57.0)(typescript@5.6.2))(eslint-import-resolver-node@0.3.9)(eslint-import-resolver-typescript@3.6.1(@typescript-eslint/parser@7.2.0(eslint@8.57.0)(typescript@5.6.2))(eslint-plugin-import@2.29.1)(eslint@8.57.0))(eslint@8.57.0):
     dependencies:
-      debug: 3.2.7(supports-color@8.1.1)
+      debug: 3.2.7(supports-color@5.5.0)
     optionalDependencies:
       '@typescript-eslint/parser': 7.2.0(eslint@8.57.0)(typescript@5.6.2)
       eslint: 8.57.0
@@ -19338,7 +19344,7 @@ snapshots:
       array.prototype.findlastindex: 1.2.3
       array.prototype.flat: 1.3.2
       array.prototype.flatmap: 1.3.2
-      debug: 3.2.7(supports-color@8.1.1)
+      debug: 3.2.7(supports-color@5.5.0)
       doctrine: 2.1.0
       eslint: 8.57.0
       eslint-import-resolver-node: 0.3.9
@@ -20136,7 +20142,7 @@ snapshots:
       array-parallel: 0.1.3
       array-series: 0.1.5
       cross-spawn: 4.0.2
-      debug: 3.2.7(supports-color@8.1.1)
+      debug: 3.2.7(supports-color@5.5.0)
     transitivePeerDependencies:
       - supports-color
 
@@ -23039,7 +23045,7 @@ snapshots:
 
   pdf-parse@1.1.1:
     dependencies:
-      debug: 3.2.7(supports-color@8.1.1)
+      debug: 3.2.7(supports-color@5.5.0)
       node-ensure: 0.0.0
     transitivePeerDependencies:
       - supports-color
@@ -23868,7 +23874,7 @@ snapshots:
 
   rhea@1.0.24:
     dependencies:
-      debug: 3.2.7(supports-color@8.1.1)
+      debug: 3.2.7(supports-color@5.5.0)
     transitivePeerDependencies:
       - supports-color