refactor(core): Simplify Redis client types (no-changelog)

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

@@ -45,7 +45,7 @@ export class CacheService extends TypedEmitter<CacheEvents> {
 			);
 
 			const redisClient = redisClientService.createClient({
-				type: 'client(cache)',
+				type: 'cache(n8n)',
 				extraOptions: { keyPrefix: prefix },
 			});
 

packages/cli/src/services/redis/RedisServiceBaseClasses.ts

@@ -4,20 +4,7 @@ import { Service } from 'typedi';
 import config from '@/config';
 import { Logger } from '@/Logger';
 import { RedisClientService } from './redis-client.service';
-
-export type RedisClientType =
-	| 'subscriber'
-	| 'client'
-	| 'bclient'
-	| 'subscriber(bull)'
-	| 'client(bull)'
-	| 'bclient(bull)'
-	| 'client(cache)'
-	| 'publisher'
-	| 'consumer'
-	| 'producer'
-	| 'list-sender'
-	| 'list-receiver';
+import type { RedisClient } from './redis.types';
 
 export type RedisServiceMessageHandler =
 	| ((channel: string, message: string) => void)
@@ -34,7 +21,7 @@ class RedisServiceBase {
 		private readonly redisClientService: RedisClientService,
 	) {}
 
-	async init(type: RedisClientType = 'client'): Promise<void> {
+	async init(type: RedisClient): Promise<void> {
 		if (this.redisClient && this.isInitialized) {
 			return;
 		}
@@ -60,7 +47,7 @@ class RedisServiceBase {
 export abstract class RedisServiceBaseSender extends RedisServiceBase {
 	senderId: string;
 
-	async init(type: RedisClientType = 'client'): Promise<void> {
+	async init(type: RedisClient): Promise<void> {
 		await super.init(type);
 		this.senderId = config.get('redis.queueModeId');
 	}

packages/cli/src/services/redis/RedisServicePubSubPublisher.ts

@@ -9,7 +9,7 @@ import { RedisServiceBaseSender } from './RedisServiceBaseClasses';
 @Service()
 export class RedisServicePubSubPublisher extends RedisServiceBaseSender {
 	async init(): Promise<void> {
-		await super.init('publisher');
+		await super.init('publisher(n8n)');
 	}
 
 	async publish(channel: string, message: string): Promise<void> {

packages/cli/src/services/redis/RedisServicePubSubSubscriber.ts

@@ -5,7 +5,7 @@ import { RedisServiceBaseReceiver } from './RedisServiceBaseClasses';
 @Service()
 export class RedisServicePubSubSubscriber extends RedisServiceBaseReceiver {
 	async init(): Promise<void> {
-		await super.init('subscriber');
+		await super.init('subscriber(n8n)');
 
 		this.redisClient?.on('message', (channel: string, message: string) => {
 			this.messageHandlers.forEach((handler: (channel: string, message: string) => void) =>

packages/cli/src/services/redis/redis-client.service.ts

@@ -2,7 +2,8 @@ import { Service } from 'typedi';
 import { Logger } from '@/Logger';
 import ioRedis from 'ioredis';
 import type { Cluster, RedisOptions } from 'ioredis';
-import type { RedisClientType } from './RedisServiceBaseClasses';
+import type { RedisClient } from './redis.types';
+
 import { OnShutdown } from '@/decorators/OnShutdown';
 import { LOWEST_SHUTDOWN_PRIORITY } from '@/constants';
 import { GlobalConfig } from '@n8n/config';
@@ -16,7 +17,7 @@ export class RedisClientService {
 		private readonly globalConfig: GlobalConfig,
 	) {}
 
-	createClient(arg: { type: RedisClientType; extraOptions?: RedisOptions }) {
+	createClient(arg: { type: RedisClient; extraOptions?: RedisOptions }) {
 		const client =
 			this.clusterNodes().length > 0
 				? this.createClusterClient(arg)
@@ -55,7 +56,7 @@ export class RedisClientService {
 		type,
 		extraOptions,
 	}: {
-		type: RedisClientType;
+		type: RedisClient;
 		extraOptions?: RedisOptions;
 	}) {
 		const options = this.getOptions({ extraOptions });

packages/cli/src/services/redis/redis.types.ts

@@ -0,0 +1,19 @@
+export type RedisClient = n8nRedisClient | BullRedisClient;
+
+/**
+ * Redis client used by n8n.
+ *
+ * - `subscriber(n8n)` to listen for messages from scaling mode communication channels
+ * - `publisher(n8n)` to send messages into scaling mode communication channels
+ * - `cache(n8n)` for caching operations (variables, resource ownership, etc.)
+ */
+type n8nRedisClient = 'subscriber(n8n)' | 'publisher(n8n)' | 'cache(n8n)';
+
+/**
+ * Redis client used internally by Bull. Suffixed with `(bull)` at `ScalingService.setupQueue`.
+ *
+ * - `subscriber(bull)` for event listening
+ * - `client(bull)` for general queue operations
+ * - `bclient(bull)` for blocking operations when processing jobs
+ */
+type BullRedisClient = 'subscriber(bull)' | 'client(bull)' | 'bclient(bull)';