163 lines
4.7 KiB
Python
163 lines
4.7 KiB
Python
"""
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homeassistant.components.switch.template
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Allows the creation of a switch that integrates other components together
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For more details about this platform, please refer to the documentation at
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https://home-assistant.io/components/switch.template/
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"""
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import logging
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from homeassistant.helpers.entity import generate_entity_id
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from homeassistant.components.switch import SwitchDevice
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from homeassistant.core import EVENT_STATE_CHANGED
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from homeassistant.const import (
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STATE_ON,
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STATE_OFF,
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ATTR_FRIENDLY_NAME,
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CONF_VALUE_TEMPLATE)
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from homeassistant.helpers.service import call_from_config
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from homeassistant.util import template, slugify
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from homeassistant.exceptions import TemplateError
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from homeassistant.components.switch import DOMAIN
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ENTITY_ID_FORMAT = DOMAIN + '.{}'
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_LOGGER = logging.getLogger(__name__)
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CONF_SWITCHES = 'switches'
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STATE_ERROR = 'error'
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ON_ACTION = 'turn_on'
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OFF_ACTION = 'turn_off'
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# pylint: disable=unused-argument
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def setup_platform(hass, config, add_devices, discovery_info=None):
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""" Sets up the switches. """
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switches = []
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if config.get(CONF_SWITCHES) is None:
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_LOGGER.error("Missing configuration data for switch platform")
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return False
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for device, device_config in config[CONF_SWITCHES].items():
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if device != slugify(device):
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_LOGGER.error("Found invalid key for switch.template: %s. "
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"Use %s instead", device, slugify(device))
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continue
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if not isinstance(device_config, dict):
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_LOGGER.error("Missing configuration data for switch %s", device)
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continue
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friendly_name = device_config.get(ATTR_FRIENDLY_NAME, device)
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state_template = device_config.get(CONF_VALUE_TEMPLATE)
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on_action = device_config.get(ON_ACTION)
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off_action = device_config.get(OFF_ACTION)
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if state_template is None:
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_LOGGER.error(
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"Missing %s for switch %s", CONF_VALUE_TEMPLATE, device)
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continue
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if on_action is None or off_action is None:
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_LOGGER.error(
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"Missing action for switch %s", device)
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continue
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switches.append(
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SwitchTemplate(
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hass,
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device,
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friendly_name,
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state_template,
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on_action,
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off_action)
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)
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if not switches:
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_LOGGER.error("No switches added")
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return False
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add_devices(switches)
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return True
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class SwitchTemplate(SwitchDevice):
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""" Represents a Template Switch. """
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# pylint: disable=too-many-arguments
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def __init__(self,
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hass,
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device_id,
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friendly_name,
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state_template,
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on_action,
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off_action):
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self.entity_id = generate_entity_id(
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ENTITY_ID_FORMAT, device_id,
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hass=hass)
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self.hass = hass
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self._name = friendly_name
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self._template = state_template
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self._on_action = on_action
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self._off_action = off_action
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self.update()
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def _update_callback(_event):
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""" Called when the target device changes state. """
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self.update_ha_state(True)
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self.hass.bus.listen(EVENT_STATE_CHANGED, _update_callback)
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@property
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def name(self):
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""" Returns the name of the device. """
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return self._name
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@property
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def should_poll(self):
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""" Tells Home Assistant not to poll this entity. """
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return False
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def turn_on(self, **kwargs):
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""" Fires the on action. """
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call_from_config(self.hass, self._on_action, True)
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def turn_off(self, **kwargs):
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""" Fires the off action. """
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call_from_config(self.hass, self._off_action, True)
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@property
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def is_on(self):
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""" True if device is on. """
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return self._value.lower() == 'true' or self._value == STATE_ON
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@property
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def is_off(self):
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""" True if device is off. """
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return self._value.lower() == 'false' or self._value == STATE_OFF
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@property
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def available(self):
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"""Return True if entity is available."""
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return self.is_on or self.is_off
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def update(self):
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""" Updates the state from the template. """
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try:
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self._value = template.render(self.hass, self._template)
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if not self.available:
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_LOGGER.error(
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"`%s` is not a switch state, setting %s to unavailable",
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self._value, self.entity_id)
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except TemplateError as ex:
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self._value = STATE_ERROR
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_LOGGER.error(ex)
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