add metrics

config.json.example

@@ -1,9 +1,9 @@
 {
   "TOKEN": "",
   "MAX_PLAYLIST_SIZE": 10,
-  "PREFIX": "/",
   "PRUNING": false,
   "LOCALE": "en",
   "STAY_TIME": 30,
-  "DEFAULT_VOLUME": 100
+  "DEFAULT_VOLUME": 100,
+  "METRICS_PORT": 3000
 }

index.ts

@@ -1,6 +1,9 @@
 import { Client, GatewayIntentBits } from "discord.js";
+import startMetricsServer from "./metrics";
 import { Bot } from "./structs/Bot";
 
+startMetricsServer();
+
 export const bot = new Bot(
   new Client({
     intents: [

interfaces/Config.ts

@@ -1,9 +1,9 @@
 export interface Config {
   TOKEN: string;
-  PREFIX: string;
   MAX_PLAYLIST_SIZE: number;
   PRUNING: boolean;
   STAY_TIME: number;
   DEFAULT_VOLUME: number;
   LOCALE: string;
+  METRICS_PORT: number;
 }

metrics/index.ts

@@ -0,0 +1,34 @@
+import http from 'http';
+import promClient from 'prom-client';
+import { config } from '../utils/config';
+import { Logger } from '../utils/logger';
+
+const PORT = config.METRICS_PORT;
+
+export default function startMetricsServer() {
+    promClient.collectDefaultMetrics();
+
+    const server = http.createServer(async function (req, res) {
+        try {
+            if (req.url === '/metrics') {
+                res.setHeader('Content-Type', promClient.register.contentType);
+                res.write(await promClient.register.metrics());
+                res.end();
+                return;
+            }
+            res.statusCode = 404;
+            res.write('Not found');
+            res.end();
+        } catch (err) {
+            Logger.error(`Metrics server response error`);
+            Logger.error(err);
+            res.statusCode = 500;
+            res.write('Internal server error');
+            res.end();
+        }
+    })
+
+    server.listen(PORT, function () {
+        console.log(`Metrics server started at port ${PORT}`);
+    });
+}

package.json

@@ -27,6 +27,7 @@
     "i18n": "^0.15.1",
     "lyrics-finder": "^21.0.5",
     "play-dl": "^1.9.7",
+    "prom-client": "^15.0.0",
     "soundcloud-downloader": "^0.2.3",
     "string-progressbar": "^1.0.4",
     "typescript": "^5.2.2",

structs/Bot.ts

@@ -23,7 +23,7 @@ import { Song } from "./Song";
 
 export class Bot {
   private readonly logger = new Logger(this.constructor.name);
-  public readonly prefix = config.PREFIX;
+  public readonly prefix = `/`;
   public commands = new Collection<string, Command>();
   public slashCommands = new Array<ApplicationCommandDataResolvable>();
   public slashCommandsMap = new Collection<string, Command>();

utils/config.ts

@@ -8,12 +8,12 @@ try {
 } catch (error) {
   config = {
     TOKEN: process.env.TOKEN || "",
-    PREFIX: process.env.PREFIX || "!",
     MAX_PLAYLIST_SIZE: 500, // parseInt(process.env.MAX_PLAYLIST_SIZE!) || 10,
     PRUNING: process.env.PRUNING === "true" ? true : false,
     STAY_TIME: parseInt(process.env.STAY_TIME!) || 30,
     DEFAULT_VOLUME: parseInt(process.env.DEFAULT_VOLUME!) || 100,
-    LOCALE: process.env.LOCALE || "en"
+    LOCALE: process.env.LOCALE || "en",
+    METRICS_PORT: parseInt(process.env.METRICS_PORT!) || 3000,
   };
 }