Be more resilient in noise floor gathering

app/services/radio_noise_floor.py

@@ -60,8 +60,17 @@ async def sample_noise_floor_once(*, blocking: bool = False) -> None:
 
 async def _noise_floor_sampling_loop() -> None:
     while True:
-        await sample_noise_floor_once()
-        await asyncio.sleep(NOISE_FLOOR_SAMPLE_INTERVAL_SECONDS)
+        try:
+            await sample_noise_floor_once()
+        except asyncio.CancelledError:
+            raise
+        except Exception:
+            logger.exception("Noise floor sampling loop crashed during sample")
+
+        try:
+            await asyncio.sleep(NOISE_FLOOR_SAMPLE_INTERVAL_SECONDS)
+        except asyncio.CancelledError:
+            raise
 
 
 async def start_noise_floor_sampling() -> None:

tests/test_radio_noise_floor.py

@@ -0,0 +1,37 @@
+import asyncio
+from unittest.mock import patch
+
+import pytest
+
+from app.services import radio_noise_floor
+
+
+class TestNoiseFloorSamplingLoop:
+    @pytest.mark.asyncio
+    async def test_logs_and_continues_after_unexpected_sample_exception(self):
+        sample_calls = 0
+        sleep_calls = 0
+
+        async def fake_sample() -> None:
+            nonlocal sample_calls
+            sample_calls += 1
+            if sample_calls == 1:
+                raise RuntimeError("boom")
+
+        async def fake_sleep(_seconds: int) -> None:
+            nonlocal sleep_calls
+            sleep_calls += 1
+            if sleep_calls >= 2:
+                raise asyncio.CancelledError()
+
+        with (
+            patch.object(radio_noise_floor, "sample_noise_floor_once", side_effect=fake_sample),
+            patch.object(radio_noise_floor.asyncio, "sleep", side_effect=fake_sleep),
+            patch.object(radio_noise_floor.logger, "exception") as mock_exception,
+        ):
+            with pytest.raises(asyncio.CancelledError):
+                await radio_noise_floor._noise_floor_sampling_loop()
+
+        assert sample_calls == 2
+        assert sleep_calls == 2
+        mock_exception.assert_called_once()