145 lines
4.6 KiB
Python
145 lines
4.6 KiB
Python
"""
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Allows to configure custom shell commands to turn a value for a sensor.
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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/sensor.command_line/
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"""
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import logging
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import subprocess
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import shlex
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from datetime import timedelta
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import voluptuous as vol
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import homeassistant.helpers.config_validation as cv
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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from homeassistant.helpers import template
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from homeassistant.exceptions import TemplateError
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from homeassistant.const import (
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CONF_NAME, CONF_VALUE_TEMPLATE, CONF_UNIT_OF_MEASUREMENT, CONF_COMMAND,
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STATE_UNKNOWN)
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from homeassistant.helpers.entity import Entity
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_LOGGER = logging.getLogger(__name__)
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DEFAULT_NAME = 'Command Sensor'
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SCAN_INTERVAL = timedelta(seconds=60)
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
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vol.Required(CONF_COMMAND): cv.string,
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
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vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
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})
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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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"""Set up the Command Sensor."""
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name = config.get(CONF_NAME)
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command = config.get(CONF_COMMAND)
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unit = config.get(CONF_UNIT_OF_MEASUREMENT)
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value_template = config.get(CONF_VALUE_TEMPLATE)
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if value_template is not None:
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value_template.hass = hass
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data = CommandSensorData(hass, command)
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add_devices([CommandSensor(hass, data, name, unit, value_template)], True)
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class CommandSensor(Entity):
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"""Representation of a sensor that is using shell commands."""
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def __init__(self, hass, data, name, unit_of_measurement, value_template):
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"""Initialize the sensor."""
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self._hass = hass
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self.data = data
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self._name = name
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self._state = None
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self._unit_of_measurement = unit_of_measurement
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self._value_template = value_template
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@property
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def name(self):
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"""Return the name of the sensor."""
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return self._name
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@property
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def unit_of_measurement(self):
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"""Return the unit the value is expressed in."""
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return self._unit_of_measurement
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@property
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def state(self):
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"""Return the state of the device."""
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return self._state
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def update(self):
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"""Get the latest data and updates the state."""
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self.data.update()
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value = self.data.value
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if value is None:
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value = STATE_UNKNOWN
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elif self._value_template is not None:
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self._state = self._value_template.render_with_possible_json_value(
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value, STATE_UNKNOWN)
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else:
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self._state = value
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class CommandSensorData(object):
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"""The class for handling the data retrieval."""
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def __init__(self, hass, command):
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"""Initialize the data object."""
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self.value = None
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self.hass = hass
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self.command = command
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def update(self):
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"""Get the latest data with a shell command."""
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command = self.command
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cache = {}
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if command in cache:
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prog, args, args_compiled = cache[command]
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elif ' ' not in command:
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prog = command
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args = None
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args_compiled = None
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cache[command] = (prog, args, args_compiled)
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else:
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prog, args = command.split(' ', 1)
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args_compiled = template.Template(args, self.hass)
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cache[command] = (prog, args, args_compiled)
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if args_compiled:
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try:
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args_to_render = {"arguments": args}
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rendered_args = args_compiled.render(args_to_render)
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except TemplateError as ex:
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_LOGGER.exception("Error rendering command template: %s", ex)
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return
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else:
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rendered_args = None
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if rendered_args == args:
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# No template used. default behavior
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shell = True
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else:
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# Template used. Construct the string used in the shell
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command = str(' '.join([prog] + shlex.split(rendered_args)))
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shell = True
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try:
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_LOGGER.info("Running command: %s", command)
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return_value = subprocess.check_output(
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command, shell=shell, timeout=15)
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self.value = 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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except subprocess.TimeoutExpired:
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_LOGGER.error("Timeout for command: %s", command)
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