first commit

backend/monitoring/views.py

@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+from django.http import HttpResponse, StreamingHttpResponse
+from rest_framework.decorators import api_view
+from rest_framework.response import Response
+
+from .services import gps_service, network_service, video_service
+
+
+@api_view(["GET"])
+def dashboard_snapshot(request):
+    return Response(
+        {
+            "gps": gps_service.get_latest(),
+            "network": network_service.get_latest(),
+            "video": video_service.get_status(),
+        }
+    )
+
+
+@api_view(["GET"])
+def gps_latest(request):
+    return Response(gps_service.get_latest())
+
+
+@api_view(["GET"])
+def network_latest(request):
+    return Response(network_service.get_latest())
+
+
+@api_view(["GET"])
+def video_status(request):
+    return Response(video_service.get_status())
+
+
+def video_frame(request):
+    status = video_service.get_status()
+    if not status["available"]:
+        return HttpResponse(
+            status.get("source_detail") or f"JPEG frame directory not found: {status['frame_dir']}",
+            status=503,
+            content_type="text/plain; charset=utf-8",
+        )
+
+    try:
+        frame = video_service.get_next_frame()
+    except (FileNotFoundError, RuntimeError) as error:
+        return HttpResponse(
+            str(error),
+            status=503,
+            content_type="text/plain; charset=utf-8",
+        )
+
+    response = HttpResponse(frame, content_type="image/jpeg")
+    response["Cache-Control"] = "no-store, no-cache, must-revalidate, max-age=0"
+    return response
+
+
+def video_stream(request):
+    status = video_service.get_status()
+    if not status["available"]:
+        return HttpResponse(
+            status.get("source_detail") or f"JPEG frame directory not found: {status['frame_dir']}",
+            status=503,
+            content_type="text/plain; charset=utf-8",
+        )
+
+    try:
+        fps = float(request.GET.get("fps", status["fps"]))
+    except (TypeError, ValueError):
+        fps = float(status["fps"])
+
+    response = StreamingHttpResponse(
+        video_service.iter_mjpeg(fps=fps),
+        content_type="multipart/x-mixed-replace; boundary=frame",
+    )
+    response["Cache-Control"] = "no-store, no-cache, must-revalidate, max-age=0"
+    return response