Claude: WebRTC Versuch

src/snapshotService.js

@@ -2,46 +2,47 @@
 
 const express = require('express');
 
-// Returns an Express router mounted at /api/snapshot
-// GET /api/snapshot          → JSON listing of cameras
-// GET /api/snapshot/cam0     → latest JPEG from cam0
-// GET /api/snapshot/cam1     → latest JPEG from cam1
-function createSnapshotRouter(streams) {
+// Proxiert go2rtc-Frame-API als /api/snapshot/:id
+// GET /api/snapshot         → JSON mit Kamera-Liste (von go2rtc /api/streams)
+// GET /api/snapshot/cam0    → aktuelles JPEG-Frame (von go2rtc /api/frame?src=cam0)
+function createSnapshotRouter(go2rtcUrl) {
   const router = express.Router();
 
-  router.get('/', (_req, res) => {
-    res.json({
-      cameras: streams.map((s, i) => ({
-        id:       `cam${i}`,
-        device:   s.device,
-        running:  s.isRunning,
-        clients:  s.clientCount,
-        hasFrame: s.latestFrame !== null,
-        url:      `/api/snapshot/cam${i}`,
-      })),
-    });
+  router.get('/', async (_req, res) => {
+    try {
+      const r = await fetch(`${go2rtcUrl}/api/streams`);
+      if (!r.ok) throw new Error(`go2rtc ${r.status}`);
+      const streams = await r.json();
+      res.json({
+        cameras: Object.keys(streams).map(id => ({
+          id,
+          url: `/api/snapshot/${id}`,
+        })),
+      });
+    } catch (err) {
+      res.status(503).json({ error: `go2rtc nicht erreichbar: ${err.message}` });
+    }
   });
 
-  router.get('/:id', (req, res) => {
-    const idx = parseInt(req.params.id.replace('cam', ''), 10);
-    if (isNaN(idx) || !streams[idx]) {
-      return res.status(404).json({ error: 'camera not found' });
+  router.get('/:id', async (req, res) => {
+    const { id } = req.params;
+    try {
+      const upstream = await fetch(`${go2rtcUrl}/api/frame?src=${encodeURIComponent(id)}`);
+      if (!upstream.ok) {
+        return res.status(upstream.status).json({ error: 'kein Frame verfügbar' });
+      }
+      const buf = Buffer.from(await upstream.arrayBuffer());
+      res.set({
+        'Content-Type':    'image/jpeg',
+        'Content-Length':  buf.length,
+        'Cache-Control':   'no-store',
+        'X-Camera-Id':     id,
+        'X-Timestamp':     new Date().toISOString(),
+      });
+      res.end(buf);
+    } catch (err) {
+      res.status(503).json({ error: `go2rtc: ${err.message}` });
     }
-
-    const frame = streams[idx].latestFrame;
-    if (!frame) {
-      return res.status(503).json({ error: 'no frame available yet – stream may still be starting' });
-    }
-
-    res.set({
-      'Content-Type':   'image/jpeg',
-      'Content-Length': frame.length,
-      'Cache-Control':  'no-store',
-      'X-Camera-Id':    `cam${idx}`,
-      'X-Camera-Device': streams[idx].device,
-      'X-Timestamp':    new Date().toISOString(),
-    });
-    res.end(frame);
   });
 
   return router;