253 lines
7.5 KiB
Python
253 lines
7.5 KiB
Python
"""
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homeassistant.components.sun
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Provides functionality to keep track of the sun.
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Event listener
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--------------
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The suns event listener will call the service
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when the sun rises or sets with an offset.
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The sun evnt need to have the type 'sun', which service to call,
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which event (sunset or sunrise) and the offset.
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{
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"type": "sun",
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"service": "switch.turn_on",
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"event": "sunset",
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"offset": "-01:00:00"
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}
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"""
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import logging
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from datetime import datetime, timedelta
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import homeassistant as ha
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from homeassistant.const import CONF_LATITUDE, CONF_LONGITUDE
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from homeassistant.helpers import validate_config
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from homeassistant.util import str_to_datetime, datetime_to_str
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from homeassistant.components.scheduler import ServiceEventListener
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DEPENDENCIES = []
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DOMAIN = "sun"
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ENTITY_ID = "sun.sun"
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STATE_ABOVE_HORIZON = "above_horizon"
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STATE_BELOW_HORIZON = "below_horizon"
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STATE_ATTR_NEXT_RISING = "next_rising"
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STATE_ATTR_NEXT_SETTING = "next_setting"
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_LOGGER = logging.getLogger(__name__)
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def is_on(hass, entity_id=None):
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""" Returns if the sun is currently up based on the statemachine. """
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entity_id = entity_id or ENTITY_ID
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return hass.states.is_state(entity_id, STATE_ABOVE_HORIZON)
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def next_setting(hass, entity_id=None):
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""" Returns the datetime object representing the next sun setting. """
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entity_id = entity_id or ENTITY_ID
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state = hass.states.get(ENTITY_ID)
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try:
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return str_to_datetime(state.attributes[STATE_ATTR_NEXT_SETTING])
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except (AttributeError, KeyError):
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# AttributeError if state is None
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# KeyError if STATE_ATTR_NEXT_SETTING does not exist
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return None
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def next_rising(hass, entity_id=None):
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""" Returns the datetime object representing the next sun rising. """
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entity_id = entity_id or ENTITY_ID
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state = hass.states.get(ENTITY_ID)
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try:
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return str_to_datetime(state.attributes[STATE_ATTR_NEXT_RISING])
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except (AttributeError, KeyError):
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# AttributeError if state is None
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# KeyError if STATE_ATTR_NEXT_RISING does not exist
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return None
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def setup(hass, config):
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""" Tracks the state of the sun. """
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logger = logging.getLogger(__name__)
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if not validate_config(config,
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{ha.DOMAIN: [CONF_LATITUDE, CONF_LONGITUDE]},
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logger):
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return False
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try:
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import ephem
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except ImportError:
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logger.exception("Error while importing dependency ephem.")
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return False
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sun = ephem.Sun() # pylint: disable=no-member
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latitude = str(config[ha.DOMAIN][CONF_LATITUDE])
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longitude = str(config[ha.DOMAIN][CONF_LONGITUDE])
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# Validate latitude and longitude
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observer = ephem.Observer()
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errors = []
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try:
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observer.lat = latitude # pylint: disable=assigning-non-slot
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except ValueError:
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errors.append("invalid value for latitude given: {}".format(latitude))
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try:
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observer.long = longitude # pylint: disable=assigning-non-slot
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except ValueError:
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errors.append("invalid value for latitude given: {}".format(latitude))
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if errors:
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logger.error("Error setting up: %s", ", ".join(errors))
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return False
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def update_sun_state(now):
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""" Method to update the current state of the sun and
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set time of next setting and rising. """
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utc_offset = datetime.utcnow() - datetime.now()
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utc_now = now + utc_offset
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observer = ephem.Observer()
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observer.lat = latitude # pylint: disable=assigning-non-slot
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observer.long = longitude # pylint: disable=assigning-non-slot
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next_rising_dt = ephem.localtime(
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observer.next_rising(sun, start=utc_now))
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next_setting_dt = ephem.localtime(
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observer.next_setting(sun, start=utc_now))
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if next_rising_dt > next_setting_dt:
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new_state = STATE_ABOVE_HORIZON
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next_change = next_setting_dt
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else:
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new_state = STATE_BELOW_HORIZON
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next_change = next_rising_dt
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logger.info("%s. Next change: %s",
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new_state, next_change.strftime("%H:%M"))
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state_attributes = {
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STATE_ATTR_NEXT_RISING: datetime_to_str(next_rising_dt),
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STATE_ATTR_NEXT_SETTING: datetime_to_str(next_setting_dt)
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}
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hass.states.set(ENTITY_ID, new_state, state_attributes)
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# +1 second so Ephem will report it has set
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hass.track_point_in_time(update_sun_state,
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next_change + timedelta(seconds=1))
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update_sun_state(datetime.now())
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return True
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def create_event_listener(schedule, event_listener_data):
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""" Create a sun event listener based on the description. """
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negative_offset = False
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service = event_listener_data['service']
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offset_str = event_listener_data['offset']
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event = event_listener_data['event']
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if offset_str.startswith('-'):
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negative_offset = True
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offset_str = offset_str[1:]
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(hour, minute, second) = [int(x) for x in offset_str.split(':')]
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offset = timedelta(hours=hour, minutes=minute, seconds=second)
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if event == 'sunset':
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return SunsetEventListener(schedule, service, offset, negative_offset)
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return SunriseEventListener(schedule, service, offset, negative_offset)
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# pylint: disable=too-few-public-methods
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class SunEventListener(ServiceEventListener):
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""" This is the base class for sun event listeners. """
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def __init__(self, schedule, service, offset, negative_offset):
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ServiceEventListener.__init__(self, schedule, service)
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self.offset = offset
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self.negative_offset = negative_offset
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def __get_next_time(self, next_event):
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"""
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Returns when the next time the service should be called.
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Taking into account the offset and which days the event should execute.
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"""
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if self.negative_offset:
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next_time = next_event - self.offset
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else:
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next_time = next_event + self.offset
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while next_time < datetime.now() or \
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next_time.weekday() not in self.my_schedule.days:
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next_time = next_time + timedelta(days=1)
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return next_time
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def schedule_next_event(self, hass, next_event):
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""" Schedule the event """
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next_time = self.__get_next_time(next_event)
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# pylint: disable=unused-argument
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def execute(now):
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""" Call the execute method """
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self.execute(hass)
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hass.track_point_in_time(execute, next_time)
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return next_time
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# pylint: disable=too-few-public-methods
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class SunsetEventListener(SunEventListener):
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""" This class is used the call a service when the sun sets. """
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def schedule(self, hass):
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""" Schedule the event """
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next_setting_dt = next_setting(hass)
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next_time_dt = self.schedule_next_event(hass, next_setting_dt)
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_LOGGER.info(
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'SunsetEventListener scheduled for %s, will call service %s.%s',
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next_time_dt, self.domain, self.service)
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# pylint: disable=too-few-public-methods
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class SunriseEventListener(SunEventListener):
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""" This class is used the call a service when the sun rises. """
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def schedule(self, hass):
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""" Schedule the event """
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next_rising_dt = next_rising(hass)
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next_time_dt = self.schedule_next_event(hass, next_rising_dt)
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_LOGGER.info(
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'SunriseEventListener scheduled for %s, will call service %s.%s',
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next_time_dt, self.domain, self.service)
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