core/homeassistant/helpers/state.py

68 lines
1.9 KiB
Python

"""
homeassistant.helpers.state
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Helpers that help with state related things.
"""
import logging
from homeassistant import State
import homeassistant.util.dt as dt_util
from homeassistant.const import (
STATE_ON, STATE_OFF, SERVICE_TURN_ON, SERVICE_TURN_OFF, ATTR_ENTITY_ID)
_LOGGER = logging.getLogger(__name__)
# pylint: disable=too-few-public-methods, attribute-defined-outside-init
class TrackStates(object):
"""
Records the time when the with-block is entered. Will add all states
that have changed since the start time to the return list when with-block
is exited.
"""
def __init__(self, hass):
self.hass = hass
self.states = []
def __enter__(self):
self.now = dt_util.utcnow()
return self.states
def __exit__(self, exc_type, exc_value, traceback):
self.states.extend(get_changed_since(self.hass.states.all(), self.now))
def get_changed_since(states, utc_point_in_time):
"""
Returns all states that have been changed since utc_point_in_time.
"""
point_in_time = dt_util.strip_microseconds(utc_point_in_time)
return [state for state in states if state.last_updated >= point_in_time]
def reproduce_state(hass, states, blocking=False):
""" Takes in a state and will try to have the entity reproduce it. """
if isinstance(states, State):
states = [states]
for state in states:
current_state = hass.states.get(state.entity_id)
if current_state is None:
continue
if state.state == STATE_ON:
service = SERVICE_TURN_ON
elif state.state == STATE_OFF:
service = SERVICE_TURN_OFF
else:
_LOGGER.warning("Unable to reproduce state for %s", state)
continue
service_data = dict(state.attributes)
service_data[ATTR_ENTITY_ID] = state.entity_id
hass.services.call(state.domain, service, service_data, blocking)