Return a specific 404 when starting a debug replay with no recordings in range (#24024)

docs/static/frigate-api.yaml

@@ -7109,7 +7109,9 @@ paths:
               schema:
                 $ref: '#/components/schemas/DebugReplayStartResponse'
         '400':
-          description: Invalid camera, time range, or no recordings
+          description: Invalid camera or time range
+        '404':
+          description: No recordings in the requested time range
         '409':
           description: A replay session is already active
         '422':

frigate/api/debug_replay.py

@@ -13,6 +13,7 @@ from frigate.api.auth import require_role
 from frigate.api.defs.tags import Tags
 from frigate.jobs.debug_replay import (
     ExportDebugReplaySource,
+    NoRecordingsError,
     RecordingDebugReplaySource,
     start_debug_replay_job,
 )
@@ -74,7 +75,8 @@ class DebugReplayStopResponse(BaseModel):
     response_model=DebugReplayStartResponse,
     status_code=202,
     responses={
-        400: {"description": "Invalid camera, time range, or no recordings"},
+        400: {"description": "Invalid camera or time range"},
+        404: {"description": "No recordings in the requested time range"},
         409: {"description": "A replay session is already active"},
     },
     dependencies=[Depends(require_role(["admin"]))],
@@ -113,6 +115,14 @@ async def start_debug_replay(request: Request, body: DebugReplayStartBody):
             },
             status_code=409,
         )
+    except NoRecordingsError:
+        return JSONResponse(
+            content={
+                "success": False,
+                "message": "No recordings found in the selected time range",
+            },
+            status_code=404,
+        )
     except ValueError:
         logger.exception("Rejected debug replay start request")
         return JSONResponse(

frigate/jobs/debug_replay.py

@@ -115,6 +115,10 @@ def query_recordings(source_camera: str, start_ts: float, end_ts: float) -> Mode
     return cast(ModelSelect, query)
 
 
+class NoRecordingsError(ValueError):
+    """Raised when no recordings exist in the requested time range."""
+
+
 class DebugReplaySource(ABC):
     """Abstract source for a debug replay session.
 
@@ -187,7 +191,7 @@ class RecordingDebugReplaySource(DebugReplaySource):
             raise ValueError("End time must be after start time")
 
         if not query_recordings(self._camera, self._start_ts, self._end_ts).count():
-            raise ValueError(
+            raise NoRecordingsError(
                 f"No recordings found for camera '{self._camera}' in the specified time range"
             )
 

frigate/test/http_api/test_debug_replay_api.py

@@ -2,6 +2,7 @@
 
 from unittest.mock import patch
 
+from frigate.jobs.debug_replay import NoRecordingsError
 from frigate.models import Event, Recordings, ReviewSegment
 from frigate.test.http_api.base_http_test import AuthTestClient, BaseTestHttp
 
@@ -66,6 +67,32 @@ class TestDebugReplayAPI(BaseTestHttp):
         # (CodeQL: information exposure through an exception).
         self.assertEqual(body["message"], "Invalid debug replay parameters")
 
+    def test_start_returns_404_when_no_recordings(self):
+        with patch(
+            "frigate.api.debug_replay.start_debug_replay_job",
+            side_effect=NoRecordingsError(
+                "No recordings found for camera 'front' in the specified time range"
+            ),
+        ):
+            with AuthTestClient(self.app) as client:
+                resp = client.post(
+                    "/debug_replay/start",
+                    json={
+                        "camera": "front",
+                        "start_time": 100,
+                        "end_time": 200,
+                    },
+                )
+
+        self.assertEqual(resp.status_code, 404)
+        body = resp.json()
+        self.assertFalse(body["success"])
+        # Message is hard-coded so we don't echo exception text back to clients
+        # (CodeQL: information exposure through an exception).
+        self.assertEqual(
+            body["message"], "No recordings found in the selected time range"
+        )
+
     def test_start_returns_409_when_session_already_active(self):
         with patch(
             "frigate.api.debug_replay.start_debug_replay_job",

frigate/test/test_debug_replay_job.py

@@ -9,6 +9,7 @@ from unittest.mock import MagicMock, patch
 from frigate.debug_replay import DebugReplayManager
 from frigate.jobs.debug_replay import (
     DebugReplayJob,
+    NoRecordingsError,
     RecordingDebugReplaySource,
     cancel_debug_replay_job,
     get_active_runner,
@@ -129,7 +130,7 @@ class TestStartDebugReplayJob(unittest.TestCase):
         empty_qs = MagicMock()
         empty_qs.count.return_value = 0
         with patch("frigate.jobs.debug_replay.query_recordings", return_value=empty_qs):
-            with self.assertRaises(ValueError):
+            with self.assertRaises(NoRecordingsError):
                 start_debug_replay_job(
                     source=RecordingDebugReplaySource(
                         source_camera="front",

web/public/locales/en/views/replay.json

@@ -21,6 +21,7 @@
     "toast": {
       "error": "Failed to start debug replay: {{error}}",
       "alreadyActive": "A replay session is already active",
+      "noRecordings": "No recordings found in the selected time range",
       "stopError": "Failed to stop debug replay: {{error}}",
       "goToReplay": "Go to Replay"
     }

web/src/components/overlay/DebugReplayDialog.tsx

@@ -217,7 +217,11 @@ export default function DebugReplayDialog({
           error.response?.data?.detail ||
           "Unknown error";
 
-        if (error.response?.status === 409) {
+        if (error.response?.status === 404) {
+          toast.error(t("dialog.toast.noRecordings"), {
+            position: "top-center",
+          });
+        } else if (error.response?.status === 409) {
           toast.error(t("dialog.toast.alreadyActive"), {
             position: "top-center",
             closeButton: true,