core/homeassistant/components/automation/state.py

86 lines
2.9 KiB
Python

"""
Offer state listening automation rules.
For more details about this automation rule, please refer to the documentation
at https://home-assistant.io/components/automation/#state-trigger
"""
import voluptuous as vol
import homeassistant.util.dt as dt_util
from homeassistant.const import (
EVENT_STATE_CHANGED, EVENT_TIME_CHANGED, MATCH_ALL, CONF_PLATFORM)
from homeassistant.helpers.event import track_state_change, track_point_in_time
import homeassistant.helpers.config_validation as cv
CONF_ENTITY_ID = "entity_id"
CONF_FROM = "from"
CONF_TO = "to"
CONF_STATE = "state"
CONF_FOR = "for"
TRIGGER_SCHEMA = vol.All(
vol.Schema({
vol.Required(CONF_PLATFORM): 'state',
vol.Required(CONF_ENTITY_ID): cv.entity_ids,
# These are str on purpose. Want to catch YAML conversions
CONF_FROM: str,
CONF_TO: str,
CONF_STATE: str,
CONF_FOR: vol.All(cv.time_period, cv.positive_timedelta),
}),
vol.Any(cv.key_dependency(CONF_FOR, CONF_TO),
cv.key_dependency(CONF_FOR, CONF_STATE))
)
def trigger(hass, config, action):
"""Listen for state changes based on configuration."""
entity_id = config.get(CONF_ENTITY_ID)
from_state = config.get(CONF_FROM, MATCH_ALL)
to_state = config.get(CONF_TO) or config.get(CONF_STATE) or MATCH_ALL
time_delta = config.get(CONF_FOR)
def state_automation_listener(entity, from_s, to_s):
"""Listen for state changes and calls action."""
def call_action():
"""Call action with right context."""
action({
'trigger': {
'platform': 'state',
'entity_id': entity,
'from_state': from_s,
'to_state': to_s,
'for': time_delta,
}
})
if time_delta is None:
call_action()
return
def state_for_listener(now):
"""Fire on state changes after a delay and calls action."""
hass.bus.remove_listener(
EVENT_STATE_CHANGED, attached_state_for_cancel)
call_action()
def state_for_cancel_listener(entity, inner_from_s, inner_to_s):
"""Fire on changes and cancel for listener if changed."""
if inner_to_s.state == to_s.state:
return
hass.bus.remove_listener(EVENT_TIME_CHANGED,
attached_state_for_listener)
hass.bus.remove_listener(EVENT_STATE_CHANGED,
attached_state_for_cancel)
attached_state_for_listener = track_point_in_time(
hass, state_for_listener, dt_util.utcnow() + time_delta)
attached_state_for_cancel = track_state_change(
hass, entity, state_for_cancel_listener)
track_state_change(
hass, entity_id, state_automation_listener, from_state, to_state)
return True