56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
"""
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Offer template 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/components/automation/#template-trigger
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"""
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import logging
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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 CONF_VALUE_TEMPLATE, CONF_PLATFORM
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from homeassistant.helpers import condition
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from homeassistant.helpers.event import async_track_state_change
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import homeassistant.helpers.config_validation as cv
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_LOGGER = logging.getLogger(__name__)
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TRIGGER_SCHEMA = IF_ACTION_SCHEMA = vol.Schema({
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vol.Required(CONF_PLATFORM): 'template',
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vol.Required(CONF_VALUE_TEMPLATE): cv.template,
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})
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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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value_template = config.get(CONF_VALUE_TEMPLATE)
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value_template.hass = hass
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# Local variable to keep track of if the action has already been triggered
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already_triggered = False
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@callback
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def state_changed_listener(entity_id, from_s, to_s):
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"""Listen for state changes and calls action."""
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nonlocal already_triggered
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template_result = condition.async_template(hass, value_template)
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# Check to see if template returns true
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if template_result and not already_triggered:
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already_triggered = True
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hass.async_run_job(action, {
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'trigger': {
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'platform': 'template',
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'entity_id': entity_id,
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'from_state': from_s,
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'to_state': to_s,
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},
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})
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elif not template_result:
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already_triggered = False
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return async_track_state_change(hass, value_template.extract_entities(),
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state_changed_listener)
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