578 lines
19 KiB
Python
578 lines
19 KiB
Python
"""
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homeassistant
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~~~~~~~~~~~~~
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Home Assistant is a Home Automation framework for observing the state
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of entities and react to changes.
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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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import datetime as dt
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import functools as ft
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import homeassistant.util as util
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MATCH_ALL = '*'
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DOMAIN = "homeassistant"
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SERVICE_HOMEASSISTANT_STOP = "stop"
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EVENT_HOMEASSISTANT_START = "homeassistant_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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BUS_NUM_THREAD = 4
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BUS_REPORT_BUSY_TIMEOUT = dt.timedelta(minutes=1)
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PRIO_SERVICE_DEFAULT = 1
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PRIO_EVENT_STATE = 2
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PRIO_EVENT_TIME = 3
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PRIO_EVENT_DEFAULT = 4
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def start_home_assistant(bus):
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""" Start home assistant. """
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request_shutdown = threading.Event()
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bus.register_service(DOMAIN, SERVICE_HOMEASSISTANT_STOP,
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lambda service: request_shutdown.set())
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Timer(bus)
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bus.fire_event(EVENT_HOMEASSISTANT_START)
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while not request_shutdown.isSet():
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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 _process_match_param(parameter):
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""" Wraps parameter in a list if it is not one and returns it. """
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if not parameter:
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return MATCH_ALL
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elif isinstance(parameter, list):
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return parameter
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else:
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return [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 `MATCH_ALL`.
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"""
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return MATCH_ALL == pattern or subject in pattern
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def track_state_change(bus, entity_id, action, from_state=None, to_state=None):
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""" Helper method to track specific state changes. """
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from_state = _process_match_param(from_state)
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to_state = _process_match_param(to_state)
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@ft.wraps(action)
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def state_listener(event):
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""" State change listener that listens for specific state changes. """
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if entity_id == event.data['entity_id'] 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['entity_id'],
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event.data['old_state'],
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event.data['new_state'])
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bus.listen_event(EVENT_STATE_CHANGED, state_listener)
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def track_point_in_time(bus, action, point_in_time):
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""" Adds a listener that will fire once after a spefic point in time. """
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@ft.wraps(action)
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def point_in_time_listener(event):
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""" Listens for matching time_changed events. """
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now = event.data['now']
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if now > point_in_time and not hasattr(point_in_time_listener, 'run'):
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# Set variable so that we will never run twice.
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# Because the event bus might have to wait till a thread comes
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# available to execute this listener it might occur that the
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# listener gets lined up twice to be executed. This will make sure
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# the second time it does nothing.
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point_in_time_listener.run = True
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bus.remove_event_listener(EVENT_TIME_CHANGED,
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point_in_time_listener)
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action(now)
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bus.listen_event(EVENT_TIME_CHANGED, point_in_time_listener)
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# pylint: disable=too-many-arguments
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def track_time_change(bus, action,
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year=None, month=None, day=None,
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hour=None, minute=None, second=None):
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""" Adds a listener that will fire if time matches a pattern. """
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# We do not have to wrap the function with time pattern matching logic if
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# no pattern given
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if any((val is not None for val in
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(year, month, day, hour, minute, second))):
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pmp = _process_match_param
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year, month, day = pmp(year), pmp(month), pmp(day)
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hour, minute, second = pmp(hour), pmp(minute), pmp(second)
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@ft.wraps(action)
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def time_listener(event):
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""" Listens for matching time_changed events. """
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now = event.data['now']
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mat = _matcher
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if mat(now.year, year) and \
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mat(now.month, month) and \
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mat(now.day, day) and \
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mat(now.hour, hour) and \
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mat(now.minute, minute) and \
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mat(now.second, second):
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action(now)
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else:
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@ft.wraps(action)
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def time_listener(event):
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""" Fires every time event that comes in. """
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action(event.data['now'])
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bus.listen_event(EVENT_TIME_CHANGED, time_listener)
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def create_bus_job_handler(logger):
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""" Creates a job handler that logs errors to supplied `logger`. """
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def job_handler(job):
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""" Called whenever a job is available to do. """
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try:
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func, arg = job
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func(arg)
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except Exception: # pylint: disable=broad-except
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# Catch any exception our service/event_listener might throw
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# We do not want to crash our ThreadPool
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logger.exception("BusHandler:Exception doing job")
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return job_handler
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# pylint: disable=too-few-public-methods
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class ServiceCall(object):
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""" Represents a call to a service. """
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__slots__ = ['domain', 'service', 'data']
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def __init__(self, domain, service, data=None):
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self.domain = domain
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self.service = service
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self.data = data or {}
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def __repr__(self):
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if self.data:
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return "<ServiceCall {}.{}: {}>".format(
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self.domain, self.service, util.repr_helper(self.data))
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else:
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return "<ServiceCall {}.{}>".format(self.domain, self.service)
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# pylint: disable=too-few-public-methods
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class Event(object):
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""" Represents an event within the Bus. """
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__slots__ = ['event_type', 'data']
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def __init__(self, event_type, data=None):
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self.event_type = event_type
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self.data = data or {}
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def __repr__(self):
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if self.data:
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return "<Event {}: {}>".format(
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self.event_type, util.repr_helper(self.data))
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else:
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return "<Event {}>".format(self.event_type)
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class Bus(object):
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""" Class that allows different components to communicate via services
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and events.
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"""
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# pylint: disable=too-many-instance-attributes
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def __init__(self, thread_count=None):
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self.thread_count = thread_count or BUS_NUM_THREAD
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self._event_listeners = {}
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self._services = {}
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self.logger = logging.getLogger(__name__)
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self.event_lock = threading.Lock()
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self.service_lock = threading.Lock()
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self.last_busy_notice = dt.datetime.now()
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self.pool = util.ThreadPool(self.thread_count,
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create_bus_job_handler(self.logger))
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@property
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def services(self):
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""" Dict with per domain a list of available services. """
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with self.service_lock:
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return {domain: self._services[domain].keys()
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for domain in self._services}
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@property
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def event_listeners(self):
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""" Dict with events that is being listened for and the number
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of listeners.
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"""
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with self.event_lock:
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return {key: len(self._event_listeners[key])
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for key in self._event_listeners}
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def has_service(self, domain, service):
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""" Returns True if specified service exists. """
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try:
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return service in self._services[domain]
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except KeyError: # if key 'domain' does not exist
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return False
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def call_service(self, domain, service, service_data=None):
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""" Calls a service. """
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service_call = ServiceCall(domain, service, service_data)
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with self.service_lock:
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try:
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self.pool.add_job(PRIO_SERVICE_DEFAULT,
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(self._services[domain][service],
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service_call))
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self._check_busy()
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except KeyError: # if key domain or service does not exist
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raise ServiceDoesNotExistError(
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"Service does not exist: {}/{}".format(domain, service))
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def register_service(self, domain, service, service_func):
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""" Register a service. """
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with self.service_lock:
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try:
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self._services[domain][service] = service_func
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except KeyError: # Domain does not exist yet in self._services
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self._services[domain] = {service: service_func}
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def fire_event(self, event_type, event_data=None):
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""" Fire an event. """
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with self.event_lock:
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# Copy the list of the current listeners because some listeners
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# remove themselves as a listener while being executed which
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# causes the iterator to be confused.
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get = self._event_listeners.get
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listeners = get(MATCH_ALL, []) + get(event_type, [])
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event = Event(event_type, event_data)
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self.logger.info("Bus:Handling {}".format(event))
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if not listeners:
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return
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if event_type == EVENT_TIME_CHANGED:
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prio = PRIO_EVENT_TIME
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elif event_type == EVENT_STATE_CHANGED:
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prio = PRIO_EVENT_STATE
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else:
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prio = PRIO_EVENT_DEFAULT
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for func in listeners:
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self.pool.add_job(prio, (func, event))
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self._check_busy()
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def listen_event(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 ``MATCH_ALL``
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as event_type.
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"""
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with self.event_lock:
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try:
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self._event_listeners[event_type].append(listener)
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except KeyError: # event_type did not exist
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self._event_listeners[event_type] = [listener]
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def listen_once_event(self, event_type, listener):
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""" Listen once for event of a specific type.
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To listen to all events specify the constant ``MATCH_ALL``
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as event_type.
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Note: at the moment it is impossible to remove a one time listener.
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"""
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@ft.wraps(listener)
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def onetime_listener(event):
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""" Removes listener from eventbus and then fires listener. """
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if not hasattr(onetime_listener, 'run'):
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# Set variable so that we will never run twice.
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# Because the event bus might have to wait till a thread comes
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# available to execute this listener it might occur that the
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# listener gets lined up twice to be executed.
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# This will make sure the second time it does nothing.
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onetime_listener.run = True
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self.remove_event_listener(event_type, onetime_listener)
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listener(event)
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self.listen_event(event_type, onetime_listener)
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def remove_event_listener(self, event_type, listener):
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""" Removes a listener of a specific event_type. """
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with self.event_lock:
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try:
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self._event_listeners[event_type].remove(listener)
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# delete event_type list if empty
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if not self._event_listeners[event_type]:
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self._event_listeners.pop(event_type)
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except (KeyError, AttributeError):
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# KeyError is key event_type listener did not exist
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# AttributeError if listener did not exist within event_type
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pass
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def _check_busy(self):
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""" Complain if we have more than twice as many jobs queued as threads
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and if we didn't complain about it recently. """
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if self.pool.queue.qsize() / self.thread_count >= 2 and \
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dt.datetime.now()-self.last_busy_notice > BUS_REPORT_BUSY_TIMEOUT:
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self.last_busy_notice = dt.datetime.now()
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log_error = self.logger.error
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log_error(
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"Bus:All {} threads are busy and {} jobs pending".format(
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self.thread_count, self.pool.queue.qsize()))
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jobs = self.pool.current_jobs
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for start, job in jobs:
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log_error("Bus:Current job from {}: {}".format(
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util.datetime_to_str(start), job))
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class State(object):
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""" Object to represent a state within the state machine. """
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__slots__ = ['entity_id', 'state', 'attributes', 'last_changed']
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def __init__(self, entity_id, state, attributes=None, last_changed=None):
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self.entity_id = entity_id
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self.state = state
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self.attributes = attributes or {}
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last_changed = last_changed or dt.datetime.now()
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# Strip microsecond from last_changed else we cannot guarantee
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# state == State.from_dict(state.as_dict())
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# This behavior occurs because to_dict uses datetime_to_str
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# which strips microseconds
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if last_changed.microsecond:
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self.last_changed = last_changed - dt.timedelta(
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microseconds=last_changed.microsecond)
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else:
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self.last_changed = last_changed
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def copy(self):
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""" Creates a copy of itself. """
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return State(self.entity_id, self.state,
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dict(self.attributes), self.last_changed)
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def as_dict(self):
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""" Converts State to a dict to be used within JSON.
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Ensures: state == State.from_dict(state.as_dict()) """
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return {'entity_id': self.entity_id,
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'state': self.state,
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'attributes': self.attributes,
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'last_changed': util.datetime_to_str(self.last_changed)}
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@staticmethod
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def from_dict(json_dict):
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""" Static method to create a state from a dict.
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Ensures: state == State.from_json_dict(state.to_json_dict()) """
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try:
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last_changed = json_dict.get('last_changed')
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if last_changed:
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last_changed = util.str_to_datetime(last_changed)
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return State(json_dict['entity_id'],
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json_dict['state'],
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json_dict.get('attributes'),
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last_changed)
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except KeyError: # if key 'entity_id' or 'state' did not exist
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return None
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def __repr__(self):
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if self.attributes:
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return "<state {}:{} @ {}>".format(
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self.state, util.repr_helper(self.attributes),
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util.datetime_to_str(self.last_changed))
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else:
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return "<state {} @ {}>".format(
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self.state, util.datetime_to_str(self.last_changed))
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class StateMachine(object):
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""" Helper class that tracks the state of different entities. """
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def __init__(self, bus):
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self.states = {}
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self.bus = bus
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self.lock = threading.Lock()
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@property
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def entity_ids(self):
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""" List of entitie ids that are being tracked. """
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with self.lock:
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return self.states.keys()
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def remove_entity(self, entity_id):
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""" Removes a entity from the state machine.
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Returns boolean to indicate if a entity was removed. """
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with self.lock:
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try:
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del self.states[entity_id]
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return True
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except KeyError:
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# if entity does not exist
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return False
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def set_state(self, entity_id, new_state, attributes=None):
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""" Set the state of an entity, add entity if it does not exist.
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Attributes is an optional dict to specify attributes of this state. """
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attributes = attributes or {}
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with self.lock:
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# Change state and fire listeners
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try:
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old_state = self.states[entity_id]
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except KeyError:
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# If state did not exist yet
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self.states[entity_id] = State(entity_id, new_state,
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attributes)
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else:
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if old_state.state != new_state or \
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old_state.attributes != attributes:
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state = self.states[entity_id] = \
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State(entity_id, new_state, attributes)
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self.bus.fire_event(EVENT_STATE_CHANGED,
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{'entity_id': entity_id,
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'old_state': old_state,
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'new_state': state})
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def get_state(self, entity_id):
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""" Returns the state of the specified entity. """
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with self.lock:
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try:
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# Make a copy so people won't mutate the state
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return self.states[entity_id].copy()
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except KeyError:
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# If entity does not exist
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return None
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def is_state(self, entity_id, state):
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""" Returns True if entity exists and is specified state. """
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try:
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return self.get_state(entity_id).state == state
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except AttributeError:
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# get_state returned None
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return False
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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, bus):
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threading.Thread.__init__(self)
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self.daemon = True
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self.bus = bus
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bus.listen_once_event(EVENT_HOMEASSISTANT_START,
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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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last_fired_on_second = -1
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calc_now = dt.datetime.now
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while True:
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now = calc_now()
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# First check checks if we are not on a second matching the
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# timer interval. Second check checks if we did not already fire
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# this interval.
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if now.second % TIMER_INTERVAL or \
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now.second == last_fired_on_second:
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# Sleep till it is the next time that we have to fire an event.
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|
# Aim for halfway through the second that fits TIMER_INTERVAL.
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|
# If TIMER_INTERVAL is 10 fire at .5, 10.5, 20.5, etc seconds.
|
|
# This will yield the best results because time.sleep() is not
|
|
# 100% accurate because of non-realtime OS's
|
|
slp_seconds = TIMER_INTERVAL - now.second % TIMER_INTERVAL + \
|
|
.5 - now.microsecond/1000000.0
|
|
|
|
time.sleep(slp_seconds)
|
|
|
|
now = calc_now()
|
|
|
|
last_fired_on_second = now.second
|
|
|
|
self.bus.fire_event(EVENT_TIME_CHANGED,
|
|
{'now': now})
|
|
|
|
|
|
class HomeAssistantError(Exception):
|
|
""" General Home Assistant exception occured. """
|
|
|
|
|
|
class ServiceDoesNotExistError(HomeAssistantError):
|
|
""" A service has been referenced that deos not exist. """
|