Redisがインストールされているときはイベントの共有にRedisのpub/subを使うように

src/server/api/stream/index.ts

@@ -1,6 +1,5 @@
 import autobind from 'autobind-decorator';
 import * as websocket from 'websocket';
-import Xev from 'xev';
 import * as debug from 'debug';
 
 import User, { IUser } from '../../../models/user';
@@ -11,6 +10,7 @@ import readNote from '../../../services/note/read';
 
 import Channel from './channel';
 import channels from './channels';
+import { EventEmitter } from 'events';
 
 const log = debug('misskey');
 
@@ -21,14 +21,14 @@ export default class Connection {
 	public user?: IUser;
 	public app: IApp;
 	private wsConnection: websocket.connection;
-	public subscriber: Xev;
+	public subscriber: EventEmitter;
 	private channels: Channel[] = [];
 	private subscribingNotes: any = {};
 	public sendMessageToWsOverride: any = null; // 後方互換性のため
 
 	constructor(
 		wsConnection: websocket.connection,
-		subscriber: Xev,
+		subscriber: EventEmitter,
 		user: IUser,
 		app: IApp
 	) {

src/server/api/streaming.ts

@@ -1,11 +1,14 @@
 import * as http from 'http';
 import * as websocket from 'websocket';
+import * as redis from 'redis';
 import Xev from 'xev';
 
 import MainStreamConnection from './stream';
 import { ParsedUrlQuery } from 'querystring';
 import authenticate from './authenticate';
 import channels from './stream/channels';
+import { EventEmitter } from 'events';
+import config from '../../config';
 
 module.exports = (server: http.Server) => {
 	// Init websocket server
@@ -16,11 +19,36 @@ module.exports = (server: http.Server) => {
 	ws.on('request', async (request) => {
 		const connection = request.accept();
 
-		const ev = new Xev();
-
 		const q = request.resourceURL.query as ParsedUrlQuery;
 		const [user, app] = await authenticate(q.i as string);
 
+		let ev: EventEmitter;
+
+		if (config.redis) {
+			// Connect to Redis
+			const subscriber = redis.createClient(
+				config.redis.port, config.redis.host);
+
+			subscriber.subscribe('misskey');
+
+			ev = new EventEmitter();
+
+			subscriber.on('message', async (_, data) => {
+				const obj = JSON.parse(data);
+
+				console.log(obj);
+
+				ev.emit(obj.channel, obj.message);
+			});
+
+			connection.once('close', () => {
+				subscriber.unsubscribe();
+				subscriber.quit();
+			});
+		} else {
+			ev = new Xev();
+		}
+
 		const main = new MainStreamConnection(connection, ev, user, app);
 
 		// 後方互換性のため

src/stream.ts

@@ -1,4 +1,5 @@
 import * as mongo from 'mongodb';
+import redis from './db/redis';
 import Xev from 'xev';
 import Meta, { IMeta } from './models/meta';
 
@@ -9,7 +10,10 @@ class Publisher {
 	private meta: IMeta;
 
 	constructor() {
-		this.ev = new Xev();
+		// Redisがインストールされてないときはプロセス間通信を使う
+		if (redis == null) {
+			this.ev = new Xev();
+		}
 
 		setInterval(async () => {
 			this.meta = await Meta.findOne({});
@@ -28,7 +32,14 @@ class Publisher {
 			{ type: type, body: null } :
 			{ type: type, body: value };
 
-		this.ev.emit(channel, message);
+		if (this.ev) {
+			this.ev.emit(channel, message);
+		} else {
+			redis.publish('misskey', JSON.stringify({
+				channel: channel,
+				message: message
+			}));
+		}
 	}
 
 	public publishMainStream = (userId: ID, type: string, value?: any): void => {