58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
import logging
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from datetime import datetime, timedelta
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import ephem
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from app.EventBus import Event
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from app.observer.Timer import track_time_change
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STATE_CATEGORY_SUN = "weather.sun"
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SUN_STATE_ABOVE_HORIZON = "above_horizon"
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SUN_STATE_BELOW_HORIZON = "below_horizon"
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class WeatherWatcher:
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def __init__(self, config, eventbus, statemachine):
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self.logger = logging.getLogger(__name__)
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self.config = config
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self.eventbus = eventbus
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self.statemachine = statemachine
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self.observer = ephem.Observer()
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self.observer.lat = self.config.get('common','latitude')
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self.observer.long = self.config.get('common','longitude')
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self.sun = ephem.Sun()
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statemachine.add_category(STATE_CATEGORY_SUN, SUN_STATE_BELOW_HORIZON)
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self.update_sun_state()
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def next_sun_rising(self):
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return ephem.localtime(self.observer.next_rising(self.sun))
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def next_sun_setting(self):
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return ephem.localtime(self.observer.next_setting(self.sun))
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def update_sun_state(self, now=None):
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next_rising = ephem.localtime(self.observer.next_rising(self.sun))
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next_setting = ephem.localtime(self.observer.next_setting(self.sun))
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if next_rising > next_setting:
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new_state = SUN_STATE_ABOVE_HORIZON
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next_change = next_setting
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else:
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new_state = SUN_STATE_BELOW_HORIZON
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next_change = next_rising
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self.logger.info("Updating sun state to {}. Next change: {}".format(new_state, next_change))
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self.statemachine.set_state(STATE_CATEGORY_SUN, new_state)
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# +10 seconds to be sure that the change has occured
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track_time_change(self.eventbus, self.update_sun_state, datetime=next_change + timedelta(seconds=10))
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