100 lines
3 KiB
Python
100 lines
3 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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"""
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import logging
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from datetime import timedelta
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import homeassistant as ha
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import homeassistant.util as util
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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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def is_on(statemachine, 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 statemachine.is_state(entity_id, STATE_ABOVE_HORIZON)
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def next_setting(statemachine):
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""" Returns the datetime object representing the next sun setting. """
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state = statemachine.get_state(ENTITY_ID)
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try:
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return util.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(statemachine):
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""" Returns the datetime object representing the next sun rising. """
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state = statemachine.get_state(ENTITY_ID)
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try:
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return util.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(bus, statemachine, latitude, longitude):
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""" Tracks the state of the sun. """
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logger = logging.getLogger(__name__)
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try:
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import ephem
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except ImportError:
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logger.exception("TrackSun: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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def update_sun_state(now): # pylint: disable=unused-argument
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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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observer = ephem.Observer()
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observer.lat = latitude
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observer.long = longitude
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next_rising_dt = ephem.localtime(observer.next_rising(sun))
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next_setting_dt = ephem.localtime(observer.next_setting(sun))
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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(
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"Sun:{}. Next change: {}".format(new_state,
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next_change.strftime("%H:%M")))
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state_attributes = {
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STATE_ATTR_NEXT_RISING: util.datetime_to_str(next_rising_dt),
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STATE_ATTR_NEXT_SETTING: util.datetime_to_str(next_setting_dt)
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}
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statemachine.set_state(ENTITY_ID, new_state, state_attributes)
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# +10 seconds to be sure that the change has occured
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ha.track_point_in_time(bus, update_sun_state,
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next_change + timedelta(seconds=10))
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update_sun_state(None)
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return True
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