added prometheus default metrics to /metrics

.gitignore

@@ -24,3 +24,6 @@ docker-compose.yml
 
 # cookie file
 cookies.json
+
+# pnpm
+pnpm-lock.yaml

package.json

@@ -30,12 +30,14 @@
         "dotenv": "^16.0.1",
         "esbuild": "^0.14.51",
         "express": "^4.18.1",
+        "express-prometheus-middleware": "^1.2.0",
         "express-rate-limit": "^6.3.0",
         "ffmpeg-static": "^5.1.0",
         "hls-parser": "^0.10.7",
         "ipaddr.js": "2.1.0",
         "nanoid": "^4.0.2",
         "node-cache": "^5.1.2",
+        "prom-client": "^15.1.2",
         "psl": "1.9.0",
         "set-cookie-parser": "2.6.0",
         "undici": "^6.7.0",

src/core/api.js

@@ -1,6 +1,7 @@
 import cors from "cors";
 import rateLimit from "express-rate-limit";
 import { randomBytes } from "crypto";
+import expressPrometheusMiddleware from "express-prometheus-middleware";
 
 const ipSalt = randomBytes(64).toString('hex');
 
@@ -65,6 +66,13 @@ export function runAPI(express, app, gitCommit, gitBranch, __dirname) {
         next();
     });
 
+    app.use(expressPrometheusMiddleware({
+        metricsPath: "/metrics",
+        collectDefaultMetrics: true,
+        collectGCMetrics: true,
+        metricsApp: app,
+    }))
+
     app.use('/api/json', express.json({
         verify: (req, res, buf) => {
             let acceptCon = String(req.header('Accept')) === "application/json";