feat: allow horizontal scaling

.config/example.yml

@@ -124,6 +124,9 @@ reservedUsernames: [
 # Number of worker processes
 #clusterLimit: 1
 
+# Worker only mode
+#onlyQueueProcessor: 1
+
 # Job concurrency per worker
 # deliverJobConcurrency: 128
 # inboxJobConcurrency: 16

packages/backend/src/boot/master.ts

@@ -93,7 +93,7 @@ export async function masterMain() {
 		true,
 	);
 
-	if (!envOption.noDaemons) {
+	if (!envOption.noDaemons && !config.onlyQueueProcessor) {
 		import("../daemons/server-stats.js").then((x) => x.default());
 		import("../daemons/queue-stats.js").then((x) => x.default());
 		import("../daemons/janitor.js").then((x) => x.default());

packages/backend/src/boot/worker.ts

@@ -1,5 +1,6 @@
 import cluster from "node:cluster";
 import { initDb } from "../db/postgre.js";
+import config from "@/config/index.js";
 
 /**
  * Init worker process
@@ -7,8 +8,10 @@ import { initDb } from "../db/postgre.js";
 export async function workerMain() {
 	await initDb();
 
-	// start server
-	await import("../server/index.js").then((x) => x.default());
+	if (!config.onlyQueueProcessor) {
+		// start server
+		await import("../server/index.js").then((x) => x.default());
+	}
 
 	// start job queue
 	import("../queue/index.js").then((x) => x.default());

packages/backend/src/config/types.ts

@@ -52,6 +52,8 @@ export type Source = {
 
 	clusterLimit?: number;
 
+	onlyQueueProcessor?: boolean;
+
 	id: string;
 
 	outgoingAddressFamily?: "ipv4" | "ipv6" | "dual";