153 lines
4.5 KiB
Python
153 lines
4.5 KiB
Python
"""
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Support for collecting data from the ARWN project.
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For more details about this platform, please refer to the documentation at
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https://home-assistant.io/components/sensor.arwn/
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"""
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import asyncio
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import json
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import logging
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import homeassistant.components.mqtt as mqtt
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from homeassistant.core import callback
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from homeassistant.const import TEMP_FAHRENHEIT, TEMP_CELSIUS
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from homeassistant.helpers.entity import Entity
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from homeassistant.util import slugify
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_LOGGER = logging.getLogger(__name__)
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DEPENDENCIES = ['mqtt']
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DOMAIN = 'arwn'
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DATA_ARWN = 'arwn'
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TOPIC = 'arwn/#'
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def discover_sensors(topic, payload):
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"""Given a topic, dynamically create the right sensor type.
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Async friendly.
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"""
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parts = topic.split('/')
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unit = payload.get('units', '')
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domain = parts[1]
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if domain == 'temperature':
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name = parts[2]
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if unit == 'F':
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unit = TEMP_FAHRENHEIT
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else:
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unit = TEMP_CELSIUS
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return ArwnSensor(name, 'temp', unit)
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if domain == 'barometer':
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return ArwnSensor('Barometer', 'pressure', unit,
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"mdi:thermometer-lines")
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if domain == 'wind':
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return (ArwnSensor('Wind Speed', 'speed', unit, "mdi:speedometer"),
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ArwnSensor('Wind Gust', 'gust', unit, "mdi:speedometer"),
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ArwnSensor('Wind Direction', 'direction', '°', "mdi:compass"))
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def _slug(name):
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return 'sensor.arwn_{}'.format(slugify(name))
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@asyncio.coroutine
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def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
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"""Set up the ARWN platform."""
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@callback
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def async_sensor_event_received(topic, payload, qos):
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"""Process events as sensors.
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When a new event on our topic (arwn/#) is received we map it
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into a known kind of sensor based on topic name. If we've
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never seen this before, we keep this sensor around in a global
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cache. If we have seen it before, we update the values of the
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existing sensor. Either way, we push an ha state update at the
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end for the new event we've seen.
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This lets us dynamically incorporate sensors without any
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configuration on our side.
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"""
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event = json.loads(payload)
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sensors = discover_sensors(topic, event)
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if not sensors:
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return
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store = hass.data.get(DATA_ARWN)
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if store is None:
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store = hass.data[DATA_ARWN] = {}
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if isinstance(sensors, ArwnSensor):
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sensors = (sensors, )
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if 'timestamp' in event:
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del event['timestamp']
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for sensor in sensors:
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if sensor.name not in store:
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sensor.hass = hass
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sensor.set_event(event)
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store[sensor.name] = sensor
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_LOGGER.debug("Registering new sensor %(name)s => %(event)s",
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dict(name=sensor.name, event=event))
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async_add_devices((sensor,), True)
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else:
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store[sensor.name].set_event(event)
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yield from mqtt.async_subscribe(
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hass, TOPIC, async_sensor_event_received, 0)
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return True
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class ArwnSensor(Entity):
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"""Representation of an ARWN sensor."""
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def __init__(self, name, state_key, units, icon=None):
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"""Initialize the sensor."""
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self.hass = None
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self.entity_id = _slug(name)
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self._name = name
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self._state_key = state_key
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self.event = {}
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self._unit_of_measurement = units
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self._icon = icon
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def set_event(self, event):
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"""Update the sensor with the most recent event."""
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self.event = {}
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self.event.update(event)
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self.hass.async_add_job(self.async_update_ha_state())
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@property
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def state(self):
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"""Return the state of the device."""
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return self.event.get(self._state_key, None)
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@property
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def name(self):
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"""Get the name of the sensor."""
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return self._name
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@property
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def state_attributes(self):
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"""Return all the state attributes."""
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return self.event
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@property
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def unit_of_measurement(self):
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"""Return the unit of measurement the state is expressed in."""
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return self._unit_of_measurement
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@property
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def should_poll(self):
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"""Return the polling state."""
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return False
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@property
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def icon(self):
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"""Return the icon of device based on its type."""
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if self._icon:
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return self._icon
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else:
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return super().icon
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