Reconfigure MQTT alarm component if discovery info is changed

homeassistant/components/alarm_control_panel/mqtt.py

@@ -19,7 +19,7 @@
 from homeassistant.components.mqtt import (
     ATTR_DISCOVERY_HASH, CONF_AVAILABILITY_TOPIC, CONF_STATE_TOPIC,
     CONF_COMMAND_TOPIC, CONF_PAYLOAD_AVAILABLE, CONF_PAYLOAD_NOT_AVAILABLE,
-    CONF_QOS, CONF_RETAIN, MqttAvailability, MqttDiscoveryUpdate)
+    CONF_QOS, CONF_RETAIN, MqttAvailability, MqttDiscoveryUpdate, subscription)
 from homeassistant.components.mqtt.discovery import MQTT_DISCOVERY_NEW
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
@@ -71,50 +71,69 @@ async def _async_setup_entity(hass, config, async_add_entities,
                               discovery_hash=None):
     """Set up the MQTT Alarm Control Panel platform."""
     async_add_entities([MqttAlarm(
-        config.get(CONF_NAME),
-        config.get(CONF_STATE_TOPIC),
-        config.get(CONF_COMMAND_TOPIC),
-        config.get(CONF_QOS),
-        config.get(CONF_RETAIN),
-        config.get(CONF_PAYLOAD_DISARM),
-        config.get(CONF_PAYLOAD_ARM_HOME),
-        config.get(CONF_PAYLOAD_ARM_AWAY),
-        config.get(CONF_CODE),
-        config.get(CONF_AVAILABILITY_TOPIC),
-        config.get(CONF_PAYLOAD_AVAILABLE),
-        config.get(CONF_PAYLOAD_NOT_AVAILABLE),
+        config,
         discovery_hash,)])
 
 
 class MqttAlarm(MqttAvailability, MqttDiscoveryUpdate,
                 alarm.AlarmControlPanel):
     """Representation of a MQTT alarm status."""
 
-    def __init__(self, name, state_topic, command_topic, qos, retain,
-                 payload_disarm, payload_arm_home, payload_arm_away, code,
-                 availability_topic, payload_available, payload_not_available,
-                 discovery_hash):
+    def __init__(self, config, discovery_hash):
         """Init the MQTT Alarm Control Panel."""
-        MqttAvailability.__init__(self, availability_topic, qos,
-                                  payload_available, payload_not_available)
-        MqttDiscoveryUpdate.__init__(self, discovery_hash)
         self._state = STATE_UNKNOWN
-        self._name = name
-        self._state_topic = state_topic
-        self._command_topic = command_topic
-        self._qos = qos
-        self._retain = retain
-        self._payload_disarm = payload_disarm
-        self._payload_arm_home = payload_arm_home
-        self._payload_arm_away = payload_arm_away
-        self._code = code
-        self._discovery_hash = discovery_hash
+        self._config = config
+        self._sub_state = None
+
+        self._name = None
+        self._state_topic = None
+        self._command_topic = None
+        self._qos = None
+        self._retain = None
+        self._payload_disarm = None
+        self._payload_arm_home = None
+        self._payload_arm_away = None
+        self._code = None
+
+        # Load config
+        self._setup_from_config(config)
+
+        availability_topic = config.get(CONF_AVAILABILITY_TOPIC)
+        payload_available = config.get(CONF_PAYLOAD_AVAILABLE)
+        payload_not_available = config.get(CONF_PAYLOAD_NOT_AVAILABLE)
+        MqttAvailability.__init__(self, availability_topic, self._qos,
+                                  payload_available, payload_not_available)
+        MqttDiscoveryUpdate.__init__(self, discovery_hash,
+                                     self.discovery_update)
 
     async def async_added_to_hass(self):
         """Subscribe mqtt events."""
         await MqttAvailability.async_added_to_hass(self)
         await MqttDiscoveryUpdate.async_added_to_hass(self)
+        await self._subscribe_topics()
 
+    async def discovery_update(self, discovery_payload):
+        """Handle updated discovery message."""
+        config = PLATFORM_SCHEMA(discovery_payload)
+        self._setup_from_config(config)
+        await self.availability_discovery_update(config)
+        await self._subscribe_topics()
+        self.async_schedule_update_ha_state()
+
+    def _setup_from_config(self, config):
+        """(Re)Setup the entity."""
+        self._name = config.get(CONF_NAME)
+        self._state_topic = config.get(CONF_STATE_TOPIC)
+        self._command_topic = config.get(CONF_COMMAND_TOPIC)
+        self._qos = config.get(CONF_QOS)
+        self._retain = config.get(CONF_RETAIN)
+        self._payload_disarm = config.get(CONF_PAYLOAD_DISARM)
+        self._payload_arm_home = config.get(CONF_PAYLOAD_ARM_HOME)
+        self._payload_arm_away = config.get(CONF_PAYLOAD_ARM_AWAY)
+        self._code = config.get(CONF_CODE)
+
+    async def _subscribe_topics(self):
+        """(Re)Subscribe to topics."""
         @callback
         def message_received(topic, payload, qos):
             """Run when new MQTT message has been received."""
@@ -126,8 +145,16 @@ def message_received(topic, payload, qos):
             self._state = payload
             self.async_schedule_update_ha_state()
 
-        await mqtt.async_subscribe(
-            self.hass, self._state_topic, message_received, self._qos)
+        self._sub_state = await subscription.async_subscribe_topics(
+            self.hass, self._sub_state,
+            {'state_topic': {'topic': self._state_topic,
+                             'msg_callback': message_received,
+                             'qos': self._qos}})
+
+    async def async_will_remove_from_hass(self):
+        """Unsubscribe when removed."""
+        await subscription.async_unsubscribe_topics(self.hass, self._sub_state)
+        await MqttAvailability.async_will_remove_from_hass(self)
 
     @property
     def should_poll(self):

tests/components/alarm_control_panel/test_mqtt.py

@@ -271,3 +271,42 @@ async def test_discovery_removal_alarm(hass, mqtt_mock, caplog):
 
     state = hass.states.get('alarm_control_panel.beer')
     assert state is None
+
+
+async def test_discovery_update_alarm(hass, mqtt_mock, caplog):
+    """Test removal of discovered alarm_control_panel."""
+    entry = MockConfigEntry(domain=mqtt.DOMAIN)
+    await async_start(hass, 'homeassistant', {}, entry)
+
+    data1 = (
+        '{ "name": "Beer",'
+        '  "status_topic": "test_topic",'
+        '  "command_topic": "test_topic" }'
+    )
+    data2 = (
+        '{ "name": "Milk",'
+        '  "status_topic": "test_topic",'
+        '  "command_topic": "test_topic" }'
+    )
+
+    async_fire_mqtt_message(hass,
+                            'homeassistant/alarm_control_panel/bla/config',
+                            data1)
+    await hass.async_block_till_done()
+
+    state = hass.states.get('alarm_control_panel.beer')
+    assert state is not None
+    assert state.name == 'Beer'
+
+    async_fire_mqtt_message(hass,
+                            'homeassistant/alarm_control_panel/bla/config',
+                            data2)
+    await hass.async_block_till_done()
+    await hass.async_block_till_done()
+
+    state = hass.states.get('alarm_control_panel.beer')
+    assert state is not None
+    assert state.name == 'Milk'
+
+    state = hass.states.get('alarm_control_panel.milk')
+    assert state is None