126 lines
4.0 KiB
Python
126 lines
4.0 KiB
Python
"""
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Support for custom shell commands to turn a switch on/off.
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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.command_switch/
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"""
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import logging
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import subprocess
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from homeassistant.components.switch import SwitchDevice
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from homeassistant.const import CONF_VALUE_TEMPLATE
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from homeassistant.helpers import template
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_LOGGER = logging.getLogger(__name__)
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# pylint: disable=unused-argument
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def setup_platform(hass, config, add_devices_callback, discovery_info=None):
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"""Find and return switches controlled by shell commands."""
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switches = config.get('switches', {})
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devices = []
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for dev_name, properties in switches.items():
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devices.append(
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CommandSwitch(
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hass,
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properties.get('name', dev_name),
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properties.get('oncmd', 'true'),
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properties.get('offcmd', 'true'),
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properties.get('statecmd', False),
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properties.get(CONF_VALUE_TEMPLATE, False)))
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add_devices_callback(devices)
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class CommandSwitch(SwitchDevice):
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"""Representation a switch that can be toggled using shell commands."""
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# pylint: disable=too-many-arguments
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def __init__(self, hass, name, command_on, command_off,
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command_state, value_template):
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"""Initialize the switch."""
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self._hass = hass
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self._name = name
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self._state = False
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self._command_on = command_on
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self._command_off = command_off
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self._command_state = command_state
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self._value_template = value_template
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@staticmethod
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def _switch(command):
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"""Execute the actual commands."""
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_LOGGER.info('Running command: %s', command)
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success = (subprocess.call(command, shell=True) == 0)
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if not success:
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_LOGGER.error('Command failed: %s', command)
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return success
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@staticmethod
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def _query_state_value(command):
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"""Execute state command for return value."""
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_LOGGER.info('Running state command: %s', command)
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try:
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return_value = subprocess.check_output(command, shell=True)
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return return_value.strip().decode('utf-8')
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except subprocess.CalledProcessError:
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_LOGGER.error('Command failed: %s', command)
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@staticmethod
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def _query_state_code(command):
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"""Execute state command for return code."""
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_LOGGER.info('Running state command: %s', command)
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return subprocess.call(command, shell=True) == 0
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@property
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def should_poll(self):
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"""Only poll if we have state command."""
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return self._command_state is not None
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@property
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def name(self):
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"""Return the name of the switch."""
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return self._name
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@property
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def is_on(self):
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"""Return true if device is on."""
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return self._state
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def _query_state(self):
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"""Query for state."""
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if not self._command_state:
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_LOGGER.error('No state command specified')
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return
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if self._value_template:
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return CommandSwitch._query_state_value(self._command_state)
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return CommandSwitch._query_state_code(self._command_state)
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def update(self):
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"""Update device state."""
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if self._command_state:
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payload = str(self._query_state())
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if self._value_template:
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payload = template.render_with_possible_json_value(
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self._hass, self._value_template, payload)
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self._state = (payload.lower() == "true")
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def turn_on(self, **kwargs):
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"""Turn the device on."""
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if (CommandSwitch._switch(self._command_on) and
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not self._command_state):
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self._state = True
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self.update_ha_state()
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def turn_off(self, **kwargs):
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"""Turn the device off."""
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if (CommandSwitch._switch(self._command_off) and
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not self._command_state):
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self._state = False
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self.update_ha_state()
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