Keep the previous value for pollen and radar when the API fails only for those items but not for the main forecast

custom_components/irm_kmi/coordinator.py

@@ -116,10 +116,8 @@ class IrmKmiCoordinator(DataUpdateCoordinator):
         try:
             images_from_api = await self.download_images_from_api(animation_data, country, localisation_layer_url)
         except IrmKmiApiError as err:
-            _LOGGER.warning(f"Could not get images for weather radar: {err}")
-            # TODO idea return self.data.get('animation', RadarAnimationData())
-            #  this way, when we cannot update, we keep the old data
-            return RadarAnimationData()
+            _LOGGER.warning(f"Could not get images for weather radar: {err}.  Keep the existing radar data.")
+            return self.data.get('animation', RadarAnimationData()) if self.data is not None else RadarAnimationData()
 
         localisation = images_from_api[0]
         images_from_api = images_from_api[1:]
@@ -152,8 +150,9 @@ class IrmKmiCoordinator(DataUpdateCoordinator):
             _LOGGER.debug(f"Requesting pollen SVG at url {svg_url}")
             pollen_svg: str = await self._api_client.get_svg(svg_url)
         except IrmKmiApiError as err:
-            _LOGGER.warning(f"Could not get pollen data from the API: {err}")
-            return PollenParser.get_default_data()
+            _LOGGER.warning(f"Could not get pollen data from the API: {err}. Keeping the same data.")
+            return self.data.get('pollen', PollenParser.get_unavailable_data()) \
+                if self.data is not None else PollenParser.get_unavailable_data()
 
         return PollenParser(pollen_svg).get_pollen_data()
 

custom_components/irm_kmi/pollen.py

@@ -8,6 +8,11 @@ from custom_components.irm_kmi.const import POLLEN_NAMES
 _LOGGER = logging.getLogger(__name__)
 
 
+def get_unavailable_data() -> dict:
+    """Return all the known pollen with 'none' value"""
+    return {k.lower(): 'none' for k in POLLEN_NAMES}
+
+
 class PollenParser:
     """
     The SVG looks as follows (see test fixture for a real example)
@@ -25,6 +30,7 @@ class PollenParser:
     For the color scale, look for a white dot (nearly) at the same level as the pollen name.  From the white dot
     horizontal position, determine the level
     """
+
     def __init__(
             self,
             xml_string: str
@@ -53,6 +59,11 @@ class PollenParser:
         """Return all the known pollen with 'none' value"""
         return {k.lower(): 'none' for k in POLLEN_NAMES}
 
+    @staticmethod
+    def get_unavailable_data() -> dict:
+        """Return all the known pollen with 'none' value"""
+        return {k.lower(): None for k in POLLEN_NAMES}
+
     @staticmethod
     def get_option_values() -> List[str]:
         """List all the values that the pollen can have"""
@@ -128,4 +139,3 @@ class PollenParser:
 
         _LOGGER.debug(f"Pollen data: {pollen_data}")
         return pollen_data
-

tests/test_pollen.py

@@ -27,6 +27,7 @@ def test_svg_pollen_parsing():
     assert data == {'birch': 'none', 'oak': 'active', 'hazel': 'none', 'mugwort': 'none', 'alder': 'active',
                     'grasses': 'none', 'ash': 'active'}
 
+
 def test_pollen_options():
     assert PollenParser.get_option_values() == ['active', 'green', 'yellow', 'orange', 'red', 'purple', 'none']
 
@@ -50,7 +51,7 @@ async def test_pollen_data_from_api(
     assert result == expected
 
 
-async def test_pollen_error_leads_to_default_values(
+async def test_pollen_error_leads_to_unavailable_on_first_call(
         hass: HomeAssistant,
         mock_config_entry: MockConfigEntry,
         mock_exception_irm_kmi_api_svg_pollen: AsyncMock
@@ -59,5 +60,5 @@ async def test_pollen_error_leads_to_default_values(
     api_data = get_api_data("be_forecast_warning.json")
 
     result = await coordinator._async_pollen_data(api_data)
-    expected = PollenParser.get_default_data()
+    expected = PollenParser.get_unavailable_data()
     assert result == expected