NSW Rural Fire Service platform (home-assistant#16802)

* initial integration with nsw rural fire service feed

* improved test coverage

* updated requirements

* grouped imports

* removed debug print statement

* moved manager's startup code into separate call

* simplified feed update code

* simplified feed update code

* simplified device state attribute code

* added source to conform with pr home-assistant#17339

* fixed lint

* refactored how entities are managed

* fixed pylint

* simplified signalling

homeassistant/components/geo_location/nsw_rural_fire_service_feed.py

@@ -0,0 +1,284 @@
+"""
+NSW Rural Fire Service Feed platform.
+
+Retrieves current events (bush fires, grass fires, etc.) in GeoJSON format,
+and displays information on events filtered by distance and category to the
+HA instance's location.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/geo_location/nsw_rural_fire_service_feed/
+"""
+import logging
+from datetime import timedelta
+from typing import Optional
+
+import voluptuous as vol
+
+import homeassistant.helpers.config_validation as cv
+from homeassistant.components.geo_location import GeoLocationEvent, \
+    PLATFORM_SCHEMA
+from homeassistant.const import CONF_RADIUS, CONF_SCAN_INTERVAL, \
+    EVENT_HOMEASSISTANT_START, ATTR_ATTRIBUTION
+from homeassistant.core import callback
+from homeassistant.helpers.dispatcher import dispatcher_send, \
+    async_dispatcher_connect
+from homeassistant.helpers.event import track_time_interval
+
+REQUIREMENTS = ['geojson_client==0.1']
+
+_LOGGER = logging.getLogger(__name__)
+
+ATTR_CATEGORY = 'category'
+ATTR_COUNCIL_AREA = 'council_area'
+ATTR_EXTERNAL_ID = 'external_id'
+ATTR_FIRE = 'fire'
+ATTR_LOCATION = 'location'
+ATTR_PUBLICATION_DATE = 'publication_date'
+ATTR_RESPONSIBLE_AGENCY = 'responsible_agency'
+ATTR_SIZE = 'size'
+ATTR_STATUS = 'status'
+ATTR_TYPE = 'type'
+
+CONF_CATEGORIES = 'categories'
+
+DEFAULT_RADIUS_IN_KM = 20.0
+DEFAULT_UNIT_OF_MEASUREMENT = "km"
+
+SCAN_INTERVAL = timedelta(minutes=5)
+
+SIGNAL_DELETE_ENTITY = 'nsw_rural_fire_service_feed_delete_{}'
+SIGNAL_UPDATE_ENTITY = 'nsw_rural_fire_service_feed_update_{}'
+
+SOURCE = 'nsw_rural_fire_service_feed'
+
+VALID_CATEGORIES = ['Emergency Warning', 'Watch and Act', 'Advice',
+                    'Not Applicable']
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Optional(CONF_RADIUS, default=DEFAULT_RADIUS_IN_KM):
+        vol.Coerce(float),
+    vol.Optional(CONF_CATEGORIES, default=[]):
+        vol.All(cv.ensure_list, [vol.In(VALID_CATEGORIES)])
+})
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the GeoJSON Events platform."""
+    scan_interval = config.get(CONF_SCAN_INTERVAL, SCAN_INTERVAL)
+    radius_in_km = config[CONF_RADIUS]
+    categories = config.get(CONF_CATEGORIES)
+    # Initialize the entity manager.
+    feed = NswRuralFireServiceFeedManager(hass, add_entities, scan_interval,
+                                          radius_in_km, categories)
+
+    def start_feed_manager(event):
+        """Start feed manager."""
+        feed.startup()
+
+    hass.bus.listen_once(EVENT_HOMEASSISTANT_START, start_feed_manager)
+
+
+class NswRuralFireServiceFeedManager:
+    """Feed Manager for NSW Rural Fire Service GeoJSON feed."""
+
+    def __init__(self, hass, add_entities, scan_interval, radius_in_km,
+                 categories):
+        """Initialize the GeoJSON Feed Manager."""
+        from geojson_client.nsw_rural_fire_service_feed \
+            import NswRuralFireServiceFeed
+        self._hass = hass
+        self._feed = NswRuralFireServiceFeed((hass.config.latitude,
+                                              hass.config.longitude),
+                                             filter_radius=radius_in_km,
+                                             filter_categories=categories)
+        self._add_entities = add_entities
+        self._scan_interval = scan_interval
+        self.feed_entries = {}
+        self._managed_external_ids = set()
+
+    def startup(self):
+        """Start up this manager."""
+        self._update()
+        self._init_regular_updates()
+
+    def _init_regular_updates(self):
+        """Schedule regular updates at the specified interval."""
+        track_time_interval(self._hass, lambda now: self._update(),
+                            self._scan_interval)
+
+    def _update(self):
+        """Update the feed and then update connected entities."""
+        import geojson_client
+        status, feed_entries = self._feed.update()
+        if status == geojson_client.UPDATE_OK:
+            _LOGGER.debug("Data retrieved %s", feed_entries)
+            # Keep a copy of all feed entries for future lookups by entities.
+            self.feed_entries = {entry.external_id: entry
+                                 for entry in feed_entries}
+            # For entity management the external ids from the feed are used.
+            feed_external_ids = set(self.feed_entries)
+            remove_external_ids = self._managed_external_ids.difference(
+                feed_external_ids)
+            self._remove_entities(remove_external_ids)
+            update_external_ids = self._managed_external_ids.intersection(
+                feed_external_ids)
+            self._update_entities(update_external_ids)
+            create_external_ids = feed_external_ids.difference(
+                self._managed_external_ids)
+            self._generate_new_entities(create_external_ids)
+        elif status == geojson_client.UPDATE_OK_NO_DATA:
+            _LOGGER.debug("Update successful, but no data received from %s",
+                          self._feed)
+        else:
+            _LOGGER.warning("Update not successful, no data received from %s",
+                            self._feed)
+            # Remove all entities.
+            self._remove_entities(self._managed_external_ids.copy())
+
+    def _generate_new_entities(self, external_ids):
+        """Generate new entities for events."""
+        new_entities = []
+        for external_id in external_ids:
+            new_entity = NswRuralFireServiceLocationEvent(self, external_id)
+            _LOGGER.debug("New entity added %s", external_id)
+            new_entities.append(new_entity)
+            self._managed_external_ids.add(external_id)
+        # Add new entities to HA.
+        self._add_entities(new_entities, True)
+
+    def _update_entities(self, external_ids):
+        """Update entities."""
+        for external_id in external_ids:
+            _LOGGER.debug("Existing entity found %s", external_id)
+            dispatcher_send(self._hass,
+                            SIGNAL_UPDATE_ENTITY.format(external_id))
+
+    def _remove_entities(self, external_ids):
+        """Remove entities."""
+        for external_id in external_ids:
+            _LOGGER.debug("Entity not current anymore %s", external_id)
+            self._managed_external_ids.remove(external_id)
+            dispatcher_send(self._hass,
+                            SIGNAL_DELETE_ENTITY.format(external_id))
+
+
+class NswRuralFireServiceLocationEvent(GeoLocationEvent):
+    """This represents an external event with GeoJSON data."""
+
+    def __init__(self, feed_manager, external_id):
+        """Initialize entity with data from feed entry."""
+        self._feed_manager = feed_manager
+        self._external_id = external_id
+        self._name = None
+        self._distance = None
+        self._latitude = None
+        self._longitude = None
+        self._attribution = None
+        self._category = None
+        self._publication_date = None
+        self._location = None
+        self._council_area = None
+        self._status = None
+        self._type = None
+        self._fire = None
+        self._size = None
+        self._responsible_agency = None
+
+    async def async_added_to_hass(self):
+        """Call when entity is added to hass."""
+        async_dispatcher_connect(
+            self.hass, SIGNAL_DELETE_ENTITY.format(self._external_id),
+            self._delete_callback)
+        async_dispatcher_connect(
+            self.hass, SIGNAL_UPDATE_ENTITY.format(self._external_id),
+            self._update_callback)
+
+    @callback
+    def _delete_callback(self):
+        """Remove this entity."""
+        self.hass.async_create_task(self.async_remove())
+
+    @callback
+    def _update_callback(self):
+        """Call update method."""
+        self.async_schedule_update_ha_state(True)
+
+    @property
+    def should_poll(self):
+        """No polling needed for GeoJSON location events."""
+        return False
+
+    async def async_update(self):
+        """Update this entity from the data held in the feed manager."""
+        _LOGGER.debug("Updating %s", self._external_id)
+        feed_entry = self._feed_manager.feed_entries.get(self._external_id)
+        if feed_entry:
+            self._update_from_feed(feed_entry)
+
+    def _update_from_feed(self, feed_entry):
+        """Update the internal state from the provided feed entry."""
+        self._name = feed_entry.title
+        self._distance = feed_entry.distance_to_home
+        self._latitude = feed_entry.coordinates[0]
+        self._longitude = feed_entry.coordinates[1]
+        self._attribution = feed_entry.attribution
+        self._category = feed_entry.category
+        self._publication_date = feed_entry.publication_date
+        self._location = feed_entry.location
+        self._council_area = feed_entry.council_area
+        self._status = feed_entry.status
+        self._type = feed_entry.type
+        self._fire = feed_entry.fire
+        self._size = feed_entry.size
+        self._responsible_agency = feed_entry.responsible_agency
+
+    @property
+    def source(self) -> str:
+        """Return source value of this external event."""
+        return SOURCE
+
+    @property
+    def name(self) -> Optional[str]:
+        """Return the name of the entity."""
+        return self._name
+
+    @property
+    def distance(self) -> Optional[float]:
+        """Return distance value of this external event."""
+        return self._distance
+
+    @property
+    def latitude(self) -> Optional[float]:
+        """Return latitude value of this external event."""
+        return self._latitude
+
+    @property
+    def longitude(self) -> Optional[float]:
+        """Return longitude value of this external event."""
+        return self._longitude
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement."""
+        return DEFAULT_UNIT_OF_MEASUREMENT
+
+    @property
+    def device_state_attributes(self):
+        """Return the device state attributes."""
+        attributes = {}
+        for key, value in (
+                (ATTR_EXTERNAL_ID, self._external_id),
+                (ATTR_CATEGORY, self._category),
+                (ATTR_LOCATION, self._location),
+                (ATTR_ATTRIBUTION, self._attribution),
+                (ATTR_PUBLICATION_DATE, self._publication_date),
+                (ATTR_COUNCIL_AREA, self._council_area),
+                (ATTR_STATUS, self._status),
+                (ATTR_TYPE, self._type),
+                (ATTR_FIRE, self._fire),
+                (ATTR_SIZE, self._size),
+                (ATTR_RESPONSIBLE_AGENCY, self._responsible_agency),
+        ):
+            if value or isinstance(value, bool):
+                attributes[key] = value
+        return attributes

requirements_all.txt

@@ -399,6 +399,7 @@ gearbest_parser==1.0.7
 geizhals==0.0.7
 
 # homeassistant.components.geo_location.geo_json_events
+# homeassistant.components.geo_location.nsw_rural_fire_service_feed
 geojson_client==0.1
 
 # homeassistant.components.sensor.geo_rss_events

requirements_test_all.txt

@@ -72,6 +72,7 @@ foobot_async==0.3.1
 gTTS-token==1.1.2
 
 # homeassistant.components.geo_location.geo_json_events
+# homeassistant.components.geo_location.nsw_rural_fire_service_feed
 geojson_client==0.1
 
 # homeassistant.components.sensor.geo_rss_events