mirror of
https://github.com/home-assistant/core.git
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82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
"""
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Offer state listening automation rules.
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For more details about this automation rule, please refer to the documentation
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at https://home-assistant.io/docs/automation/trigger/#state-trigger
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"""
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import asyncio
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import voluptuous as vol
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from homeassistant.core import callback
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from homeassistant.const import MATCH_ALL, CONF_PLATFORM, CONF_FOR
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from homeassistant.helpers.event import (
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async_track_state_change, async_track_same_state)
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import homeassistant.helpers.config_validation as cv
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CONF_ENTITY_ID = 'entity_id'
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CONF_FROM = 'from'
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CONF_TO = 'to'
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TRIGGER_SCHEMA = vol.All(vol.Schema({
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vol.Required(CONF_PLATFORM): 'state',
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vol.Required(CONF_ENTITY_ID): cv.entity_ids,
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# These are str on purpose. Want to catch YAML conversions
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vol.Optional(CONF_FROM): str,
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vol.Optional(CONF_TO): str,
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vol.Optional(CONF_FOR): vol.All(cv.time_period, cv.positive_timedelta),
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}), cv.key_dependency(CONF_FOR, CONF_TO))
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@asyncio.coroutine
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def async_trigger(hass, config, action):
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"""Listen for state changes based on configuration."""
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entity_id = config.get(CONF_ENTITY_ID)
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from_state = config.get(CONF_FROM, MATCH_ALL)
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to_state = config.get(CONF_TO, MATCH_ALL)
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time_delta = config.get(CONF_FOR)
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match_all = (from_state == MATCH_ALL and to_state == MATCH_ALL)
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unsub_track_same = {}
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@callback
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def state_automation_listener(entity, from_s, to_s):
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"""Listen for state changes and calls action."""
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@callback
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def call_action():
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"""Call action with right context."""
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hass.async_run_job(action, {
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'trigger': {
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'platform': 'state',
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'entity_id': entity,
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'from_state': from_s,
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'to_state': to_s,
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'for': time_delta,
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}
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})
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# Ignore changes to state attributes if from/to is in use
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if (not match_all and from_s is not None and to_s is not None and
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from_s.state == to_s.state):
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return
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if not time_delta:
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call_action()
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return
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unsub_track_same[entity] = async_track_same_state(
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hass, time_delta, call_action,
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lambda _, _2, to_state: to_state.state == to_s.state,
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entity_ids=entity_id)
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unsub = async_track_state_change(
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hass, entity_id, state_automation_listener, from_state, to_state)
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@callback
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def async_remove():
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"""Remove state listeners async."""
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unsub()
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for async_remove in unsub_track_same.values():
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async_remove()
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unsub_track_same.clear()
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return async_remove
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