Enable job queue

Resolve #3216

src/index.ts

@@ -100,6 +100,9 @@ async function workerMain() {
 	// start server
 	await require('./server').default();
 
+	// start processor
+	require('./queue').default();
+
 	if (cluster.isWorker) {
 		// Send a 'ready' message to parent process
 		process.send('ready');

src/queue/index.ts

@@ -1,10 +1,35 @@
+import * as Queue from 'bee-queue';
+import config from '../config';
 import http from './processors/http';
 import { ILocalUser } from '../models/user';
 import Logger from '../misc/logger';
 
+const enableQueue = config.redis != null;
+
+const queue = new Queue('misskey', {
+	redis: {
+		port: config.redis.port,
+		host: config.redis.host,
+		password: config.redis.pass
+	},
+
+	removeOnSuccess: true,
+	removeOnFailure: true,
+	getEvents: false,
+	sendEvents: false,
+	storeJobs: false
+});
+
 export function createHttpJob(data: any) {
+	if (enableQueue) {
+		return queue.createJob(data)
+			.retries(4)
+			.backoff('exponential', 16384) // 16s
+			.save();
+	} else {
 		return http({ data }, () => {});
 	}
+}
 
 export function deliver(user: ILocalUser, content: any, to: any) {
 	if (content == null) return;
@@ -18,3 +43,9 @@ export function deliver(user: ILocalUser, content: any, to: any) {
 }
 
 export const queueLogger = new Logger('queue');
+
+export default function() {
+	if (enableQueue) {
+		queue.process(128, http);
+	}
+}