244 lines
7.8 KiB
Python
244 lines
7.8 KiB
Python
"""
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homeassistant
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~~~~~~~~~~~~~
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Module to control the lights based on devices at home and the state of the sun.
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"""
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import time
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import logging
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import threading
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from collections import defaultdict, namedtuple
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from itertools import chain
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from datetime import datetime
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logging.basicConfig(level=logging.INFO)
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ALL_EVENTS = '*'
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EVENT_START = "start"
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EVENT_STATE_CHANGED = "state_changed"
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EVENT_TIME_CHANGED = "time_changed"
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TIMER_INTERVAL = 10 # seconds
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# We want to be able to fire every time a minute starts (seconds=0).
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# We want this so other modules can use that to make sure they fire
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# every minute.
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assert 60 % TIMER_INTERVAL == 0, "60 % TIMER_INTERVAL should be 0!"
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State = namedtuple("State", ['state','last_changed'])
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def start_home_assistant(eventbus):
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""" Start home assistant. """
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Timer(eventbus)
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eventbus.fire(EVENT_START)
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while True:
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try:
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time.sleep(1)
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except KeyboardInterrupt:
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break
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def ensure_list(parameter):
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""" Wraps parameter in a list if it is not one and returns it. """
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return parameter if isinstance(parameter, list) else [parameter]
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def matcher(subject, pattern):
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""" Returns True if subject matches the pattern.
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Pattern is either a list of allowed subjects or a '*'.
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"""
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return '*' in pattern or subject in pattern
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def track_state_change(eventbus, category, from_state, to_state, action):
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""" Helper method to track specific state changes. """
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from_state = ensure_list(from_state)
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to_state = ensure_list(to_state)
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def listener(event):
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""" State change listener that listens for specific state changes. """
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if category == event.data['category'] and \
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matcher(event.data['old_state'].state, from_state) and \
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matcher(event.data['new_state'].state, to_state):
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action(event.data['category'],
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event.data['old_state'],
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event.data['new_state'])
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eventbus.listen(EVENT_STATE_CHANGED, listener)
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# pylint: disable=too-many-arguments
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def track_time_change(eventbus, action,
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year='*', month='*', day='*',
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hour='*', minute='*', second='*',
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point_in_time=None, listen_once=False):
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""" Adds a listener that will listen for a specified or matching time. """
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year, month, day = ensure_list(year), ensure_list(month), ensure_list(day)
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hour, minute = ensure_list(hour), ensure_list(minute)
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second = ensure_list(second)
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def listener(event):
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""" Listens for matching time_changed events. """
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if (point_in_time and event.data['now'] > point_in_time) or \
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(not point_in_time and \
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matcher(event.data['now'].year, year) and \
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matcher(event.data['now'].month, month) and \
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matcher(event.data['now'].day, day) and \
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matcher(event.data['now'].hour, hour) and \
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matcher(event.data['now'].minute, minute) and \
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matcher(event.data['now'].second, second)):
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# point_in_time are exact points in time
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# so we always remove it after fire
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if listen_once or point_in_time:
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event.eventbus.remove_listener(EVENT_TIME_CHANGED, listener)
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action(event.data['now'])
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eventbus.listen(EVENT_TIME_CHANGED, listener)
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Event = namedtuple("Event", ["eventbus", "event_type", "data"])
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class EventBus(object):
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""" Class that allows code to listen for- and fire events. """
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def __init__(self):
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self.listeners = defaultdict(list)
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self.logger = logging.getLogger(__name__)
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def fire(self, event_type, event_data=None):
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""" Fire an event. """
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if not event_data:
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event_data = {}
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self.logger.info("EventBus:Event {}: {}".format(
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event_type, event_data))
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def run():
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""" Fire listeners for event. """
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event = Event(self, event_type, event_data)
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for listener in chain(self.listeners[ALL_EVENTS],
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self.listeners[event.event_type]):
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try:
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listener(event)
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except Exception: #pylint: disable=broad-except
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self.logger.exception("EventBus:Exception in listener")
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# We dont want the eventbus to be blocking - run in a thread.
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threading.Thread(target=run).start()
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def listen(self, event_type, listener):
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""" Listen for all events or events of a specific type.
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To listen to all events specify the constant ``ALL_EVENTS``
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as event_type.
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"""
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self.listeners[event_type].append(listener)
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def remove_listener(self, event_type, listener):
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""" Removes a listener of a specific event_type. """
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try:
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self.listeners[event_type].remove(listener)
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except ValueError:
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pass
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class StateMachine(object):
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""" Helper class that tracks the state of different objects. """
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def __init__(self, eventbus):
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self.states = dict()
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self.eventbus = eventbus
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self.lock = threading.Lock()
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def set_state(self, category, new_state):
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""" Set the state of a category, add category is it does not exist. """
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self.lock.acquire()
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# Add category is it does not exist
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if category not in self.states:
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self.states[category] = State(new_state, datetime.now())
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# Change state and fire listeners
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else:
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old_state = self.states[category]
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if old_state.state != new_state:
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self.states[category] = State(new_state, datetime.now())
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self.eventbus.fire(EVENT_STATE_CHANGED,
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{'category':category,
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'old_state':old_state,
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'new_state':self.states[category]})
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self.lock.release()
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def is_state(self, category, state):
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""" Returns True if category is specified state. """
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self._validate_category(category)
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return self.get_state(category).state == state
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def get_state(self, category):
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""" Returns a tuple (state,last_changed) describing
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the state of the specified category. """
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self._validate_category(category)
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return self.states[category]
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def get_states(self):
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""" Returns a list of tuples (category, state, last_changed)
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sorted by category case-insensitive. """
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return [(category,
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self.states[category].state,
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self.states[category].last_changed)
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for category in
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sorted(self.states.keys(), key=lambda key: key.lower())]
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def _validate_category(self, category):
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""" Helper function to throw an exception
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when the category does not exist. """
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if category not in self.states:
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raise CategoryDoesNotExistException(
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"Category {} does not exist.".format(category))
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class Timer(threading.Thread):
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""" Timer will sent out an event every TIMER_INTERVAL seconds. """
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def __init__(self, eventbus):
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threading.Thread.__init__(self)
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self.daemon = True
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self.eventbus = eventbus
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eventbus.listen(EVENT_START, lambda event: self.start())
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def run(self):
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""" Start the timer. """
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logging.getLogger(__name__).info("Timer:starting")
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while True:
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while True:
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time.sleep(1)
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now = datetime.now()
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if now.second % TIMER_INTERVAL == 0:
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break
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self.eventbus.fire(EVENT_TIME_CHANGED, {'now':now})
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class HomeAssistantException(Exception):
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""" General Home Assistant exception occured. """
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class CategoryDoesNotExistException(HomeAssistantException):
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""" Specified category does not exist within the state machine. """
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