101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
"""
|
|
homeassistant.components.binary_sensor.command_sensor
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Allows to configure custom shell commands to turn a value
|
|
into a logical value for a binary sensor.
|
|
"""
|
|
import logging
|
|
import subprocess
|
|
from datetime import timedelta
|
|
|
|
from homeassistant.const import CONF_VALUE_TEMPLATE
|
|
from homeassistant.components.binary_sensor import BinarySensorDevice
|
|
from homeassistant.util import template, Throttle
|
|
|
|
_LOGGER = logging.getLogger(__name__)
|
|
|
|
DEFAULT_NAME = "Binary Command Sensor"
|
|
DEFAULT_PAYLOAD_ON = 'ON'
|
|
DEFAULT_PAYLOAD_OFF = 'OFF'
|
|
|
|
# Return cached results if last scan was less then this time ago
|
|
MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=60)
|
|
|
|
|
|
# pylint: disable=unused-argument
|
|
def setup_platform(hass, config, add_devices, discovery_info=None):
|
|
""" Add the Command Sensor. """
|
|
|
|
if config.get('command') is None:
|
|
_LOGGER.error('Missing required variable: "command"')
|
|
return False
|
|
|
|
data = CommandSensorData(config.get('command'))
|
|
|
|
add_devices([CommandBinarySensor(
|
|
hass,
|
|
data,
|
|
config.get('name', DEFAULT_NAME),
|
|
config.get('payload_on', DEFAULT_PAYLOAD_ON),
|
|
config.get('payload_off', DEFAULT_PAYLOAD_OFF),
|
|
config.get(CONF_VALUE_TEMPLATE)
|
|
)])
|
|
|
|
|
|
# pylint: disable=too-many-arguments
|
|
class CommandBinarySensor(BinarySensorDevice):
|
|
""" Represents a binary sensor that is returning
|
|
a value of a shell commands. """
|
|
def __init__(self, hass, data, name, payload_on,
|
|
payload_off, value_template):
|
|
self._hass = hass
|
|
self.data = data
|
|
self._name = name
|
|
self._state = False
|
|
self._payload_on = payload_on
|
|
self._payload_off = payload_off
|
|
self._value_template = value_template
|
|
self.update()
|
|
|
|
@property
|
|
def name(self):
|
|
""" The name of the sensor. """
|
|
return self._name
|
|
|
|
@property
|
|
def is_on(self):
|
|
""" True if the binary sensor is on. """
|
|
return self._state
|
|
|
|
def update(self):
|
|
""" Gets the latest data and updates the state. """
|
|
self.data.update()
|
|
value = self.data.value
|
|
|
|
if self._value_template is not None:
|
|
value = template.render_with_possible_json_value(
|
|
self._hass, self._value_template, value, False)
|
|
if value == self._payload_on:
|
|
self._state = True
|
|
elif value == self._payload_off:
|
|
self._state = False
|
|
|
|
|
|
# pylint: disable=too-few-public-methods
|
|
class CommandSensorData(object):
|
|
""" Class for handling the data retrieval. """
|
|
|
|
def __init__(self, command):
|
|
self.command = command
|
|
self.value = None
|
|
|
|
@Throttle(MIN_TIME_BETWEEN_UPDATES)
|
|
def update(self):
|
|
""" Gets the latest data with a shell command. """
|
|
_LOGGER.info('Running command: %s', self.command)
|
|
|
|
try:
|
|
return_value = subprocess.check_output(self.command, shell=True)
|
|
self.value = return_value.strip().decode('utf-8')
|
|
except subprocess.CalledProcessError:
|
|
_LOGGER.error('Command failed: %s', self.command)
|