Add exception handling to Sonarr (#4569)

* Add exception handling to request call to prevent
failure in setup_platform if host is down

* update for comments

* update test for state being none

* remove unused import

homeassistant/components/sensor/sonarr.py

@@ -86,6 +86,7 @@ class SonarrSensor(Entity):
         self.ssl = 's' if conf.get(CONF_SSL) else ''
 
         # Object data
+        self.data = []
         self._tz = timezone(str(hass.config.time_zone))
         self.type = sensor_type
         self._name = SENSOR_TYPES[self.type][0]
@@ -96,16 +97,24 @@ class SonarrSensor(Entity):
         self._icon = SENSOR_TYPES[self.type][2]
 
         # Update sensor
+        self._available = False
         self.update()
 
     def update(self):
         """Update the data for the sensor."""
         start = get_date(self._tz)
         end = get_date(self._tz, self.days)
+        try:
             res = requests.get(
                 ENDPOINTS[self.type].format(
                     self.ssl, self.host, self.port, self.apikey, start, end),
                 timeout=5)
+        except OSError:
+            _LOGGER.error('Host %s is not available', self.host)
+            self._available = False
+            self._state = None
+            return
+
         if res.status_code == 200:
             if self.type in ['upcoming', 'queue', 'series', 'commands']:
                 if self.days == 1 and self.type == 'upcoming':
@@ -146,6 +155,7 @@ class SonarrSensor(Entity):
                         self._unit
                     )
                 )
+            self._available = True
 
     @property
     def name(self):
@@ -157,6 +167,11 @@ class SonarrSensor(Entity):
         """Return sensor state."""
         return self._state
 
+    @property
+    def available(self):
+        """Return sensor availability."""
+        return self._available
+
     @property
     def unit_of_measurement(self):
         """Return the unit of the sensor."""

tests/components/sensor/test_sonarr.py

@@ -10,6 +10,11 @@ from homeassistant.components.sensor import sonarr
 from tests.common import get_test_home_assistant
 
 
+def mocked_exception(*args, **kwargs):
+    """Mock exception thrown by requests.get."""
+    raise OSError
+
+
 def mocked_requests_get(*args, **kwargs):
     """Mock requests.get invocations."""
     class MockResponse:
@@ -814,3 +819,23 @@ class TestSonarrSetup(unittest.TestCase):
                 'S04E11',
                 device.device_state_attributes["Bob's Burgers"]
             )
+
+    @unittest.mock.patch('requests.get', side_effect=mocked_exception)
+    def test_exception_handling(self, req_mock):
+        """Tests exception being handled"""
+        config = {
+            'platform': 'sonarr',
+            'api_key': 'foo',
+            'days': '1',
+            'unit': 'GB',
+            "include_paths": [
+                '/data'
+            ],
+            'monitored_conditions': [
+                'upcoming'
+            ]
+        }
+        sonarr.setup_platform(self.hass, config, self.add_devices, None)
+        for device in self.DEVICES:
+            device.update()
+            self.assertEqual(None, device.state)