Syslog support

Resolve #5355

.config/example.yml

@@ -125,3 +125,8 @@ autoAdmin: true
 
 # IP address family used for outgoing request (ipv4, ipv6 or dual)
 #outgoingAddressFamily: ipv4
+
+# Syslog option
+#syslog:
+#  host: localhost
+#  port: 514

package.json

@@ -219,6 +219,7 @@
 		"stylus": "0.54.5",
 		"stylus-loader": "3.0.2",
 		"summaly": "2.3.0",
+		"syslog-pro": "1.0.0",
 		"systeminformation": "4.14.4",
 		"syuilo-password-strength": "0.0.1",
 		"terser-webpack-plugin": "1.4.1",

src/config/types.ts

@@ -45,6 +45,11 @@ export type Source = {
 
 	deliverJobConcurrency?: number;
 	inboxJobConcurrency?: number;
+
+	syslog: {
+		host: string;
+		port: number;
+	};
 };
 
 /**

src/services/logger.ts

@@ -6,6 +6,9 @@ import { program } from '../argv';
 import { getRepository } from 'typeorm';
 import { Log } from '../models/entities/log';
 import { genId } from '../misc/gen-id';
+import config from '../config';
+
+const SyslogPro = require('syslog-pro');
 
 type Domain = {
 	name: string;
@@ -18,6 +21,7 @@ export default class Logger {
 	private domain: Domain;
 	private parentLogger: Logger | null = null;
 	private store: boolean;
+	private syslogClient: any | null = null;
 
 	constructor(domain: string, color?: string, store = true) {
 		this.domain = {
@@ -25,6 +29,20 @@ export default class Logger {
 			color: color,
 		};
 		this.store = store;
+
+		if (config.syslog) {
+			this.syslogClient = new SyslogPro.RFC5424({
+				applacationName: 'Misskey',
+				timestamp: true,
+				encludeStructuredData: true,
+				color: true,
+				extendedColor: true,
+				server: {
+					target: config.syslog.host,
+					port: config.syslog.port,
+				}
+			});
+		}
 	}
 
 	public createSubLogger(domain: string, color?: string, store = true): Logger {
@@ -66,6 +84,17 @@ export default class Logger {
 		console.log(important ? chalk.bold(log) : log);
 
 		if (store) {
+			if (this.syslogClient) {
+				const send =
+					level === 'error' ? this.syslogClient.error :
+					level === 'warning' ? this.syslogClient.warning :
+					level === 'success' ? this.syslogClient.info :
+					level === 'debug' ? this.syslogClient.info :
+					level === 'info' ? this.syslogClient.info :
+					null as never;
+
+				send(message);
+			} else {
 				const Logs = getRepository(Log);
 				Logs.insert({
 					id: genId(),
@@ -79,6 +108,7 @@ export default class Logger {
 				} as Log);
 			}
 		}
+	}
 
 	public error(x: string | Error, data?: Record<string, any> | null, important = false): void { // 実行を継続できない状況で使う
 		if (x instanceof Error) {