заработал интерфейс

camlaps/services/cameras.py

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+import logging
+from pathlib import Path
+
+from django.conf import settings
+
+from ..models import Camera
+
+
+logger = logging.getLogger('camlaps')
+
+
+def _storage_root() -> Path:
+    storage_path = getattr(settings, 'STORAGE_PATH', None)
+    if storage_path is None:
+        return Path('/app/storage')
+    return Path(storage_path)
+
+
+def is_storage_available() -> bool:
+    logger.info('cameras:storage_available:start')
+    try:
+        root = _storage_root()
+        ok = root.exists() and root.is_dir()
+        logger.info('cameras:storage_available:done ok=%s', ok)
+        return ok
+    except Exception:
+        logger.exception('cameras:storage_available:error')
+        raise
+
+
+def list_active_cameras() -> list[Camera]:
+    logger.info('cameras:list_active:start')
+    try:
+        cameras = list(Camera.objects.filter(is_active=True).order_by('name'))
+        logger.info('cameras:list_active:done count=%s', len(cameras))
+        return cameras
+    except Exception:
+        logger.exception('cameras:list_active:error')
+        raise
+
+
+def get_camera_lastsnap_path(camera: Camera) -> Path | None:
+    logger.info('cameras:lastsnap_path:start camera_id=%s', camera.id)
+    try:
+        root = _storage_root().resolve()
+        candidate = (root / camera.storage_path / 'lastsnap.jpg').resolve()
+
+        if candidate != root and root not in candidate.parents:
+            logger.info('cameras:lastsnap_path:done camera_id=%s found=false', camera.id)
+            return None
+
+        if not candidate.exists() or not candidate.is_file():
+            logger.info('cameras:lastsnap_path:done camera_id=%s found=false', camera.id)
+            return None
+
+        logger.info('cameras:lastsnap_path:done camera_id=%s found=true', camera.id)
+        return candidate
+    except Exception:
+        logger.exception('cameras:lastsnap_path:error camera_id=%s', camera.id)
+        raise