152 lines
4.8 KiB
Python
152 lines
4.8 KiB
Python
"""Support for collecting data from the ARWN project."""
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import json
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import logging
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from homeassistant.components import mqtt
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from homeassistant.components.sensor import SensorEntity
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from homeassistant.const import (
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DEGREE,
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DEVICE_CLASS_TEMPERATURE,
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PRECIPITATION_INCHES,
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TEMP_CELSIUS,
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TEMP_FAHRENHEIT,
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)
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from homeassistant.core import callback
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from homeassistant.util import slugify
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_LOGGER = logging.getLogger(__name__)
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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(
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topic, name, "temp", unit, device_class=DEVICE_CLASS_TEMPERATURE
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)
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if domain == "moisture":
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name = f"{parts[2]} Moisture"
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return ArwnSensor(topic, name, "moisture", unit, "mdi:water-percent")
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if domain == "rain":
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if len(parts) >= 3 and parts[2] == "today":
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return ArwnSensor(
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topic,
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"Rain Since Midnight",
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"since_midnight",
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PRECIPITATION_INCHES,
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"mdi:water",
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)
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return (
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ArwnSensor(topic + "/total", "Total Rainfall", "total", unit, "mdi:water"),
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ArwnSensor(topic + "/rate", "Rainfall Rate", "rate", unit, "mdi:water"),
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)
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if domain == "barometer":
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return ArwnSensor(topic, "Barometer", "pressure", unit, "mdi:thermometer-lines")
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if domain == "wind":
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return (
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ArwnSensor(
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topic + "/speed", "Wind Speed", "speed", unit, "mdi:speedometer"
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),
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ArwnSensor(topic + "/gust", "Wind Gust", "gust", unit, "mdi:speedometer"),
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ArwnSensor(
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topic + "/dir", "Wind Direction", "direction", DEGREE, "mdi:compass"
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),
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)
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def _slug(name):
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return f"sensor.arwn_{slugify(name)}"
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async def async_setup_platform(hass, config, async_add_entities, 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(msg):
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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(msg.payload)
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sensors = discover_sensors(msg.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(
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"Registering sensor %(name)s => %(event)s",
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{"name": sensor.name, "event": event},
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)
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async_add_entities((sensor,), True)
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else:
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_LOGGER.debug(
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"Recording sensor %(name)s => %(event)s",
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{"name": sensor.name, "event": event},
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)
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store[sensor.name].set_event(event)
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await mqtt.async_subscribe(hass, TOPIC, async_sensor_event_received, 0)
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return True
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class ArwnSensor(SensorEntity):
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"""Representation of an ARWN sensor."""
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_attr_should_poll = False
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def __init__(self, topic, name, state_key, units, icon=None, device_class=None):
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"""Initialize the sensor."""
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self.entity_id = _slug(name)
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self._attr_name = name
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# This mqtt topic for the sensor which is its uid
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self._attr_unique_id = topic
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self._state_key = state_key
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self._attr_native_unit_of_measurement = units
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self._attr_icon = icon
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self._attr_device_class = device_class
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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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ev = {}
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ev.update(event)
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self._attr_extra_state_attributes = ev
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self._attr_native_value = ev.get(self._state_key, None)
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self.async_write_ha_state()
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