166 lines
4.8 KiB
Python
166 lines
4.8 KiB
Python
"""Support gathering system information of hosts which are running netdata."""
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from datetime import timedelta
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import logging
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from netdata import Netdata
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from netdata.exceptions import NetdataError
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import voluptuous as vol
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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from homeassistant.const import (
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CONF_HOST,
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CONF_ICON,
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CONF_NAME,
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CONF_PORT,
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CONF_RESOURCES,
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UNIT_PERCENTAGE,
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)
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from homeassistant.exceptions import PlatformNotReady
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from homeassistant.helpers.aiohttp_client import async_get_clientsession
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import homeassistant.helpers.config_validation as cv
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from homeassistant.helpers.entity import Entity
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from homeassistant.util import Throttle
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_LOGGER = logging.getLogger(__name__)
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MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=1)
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CONF_DATA_GROUP = "data_group"
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CONF_ELEMENT = "element"
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CONF_INVERT = "invert"
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DEFAULT_HOST = "localhost"
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DEFAULT_NAME = "Netdata"
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DEFAULT_PORT = 19999
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DEFAULT_ICON = "mdi:desktop-classic"
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RESOURCE_SCHEMA = vol.Any(
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{
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vol.Required(CONF_DATA_GROUP): cv.string,
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vol.Required(CONF_ELEMENT): cv.string,
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vol.Optional(CONF_ICON, default=DEFAULT_ICON): cv.icon,
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vol.Optional(CONF_INVERT, default=False): cv.boolean,
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}
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)
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Optional(CONF_HOST, default=DEFAULT_HOST): cv.string,
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
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vol.Required(CONF_RESOURCES): vol.Schema({cv.string: RESOURCE_SCHEMA}),
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}
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)
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async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
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"""Set up the Netdata sensor."""
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name = config.get(CONF_NAME)
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host = config.get(CONF_HOST)
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port = config.get(CONF_PORT)
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resources = config.get(CONF_RESOURCES)
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session = async_get_clientsession(hass)
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netdata = NetdataData(Netdata(host, hass.loop, session, port=port))
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await netdata.async_update()
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if netdata.api.metrics is None:
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raise PlatformNotReady
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dev = []
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for entry, data in resources.items():
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icon = data[CONF_ICON]
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sensor = data[CONF_DATA_GROUP]
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element = data[CONF_ELEMENT]
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invert = data[CONF_INVERT]
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sensor_name = entry
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try:
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resource_data = netdata.api.metrics[sensor]
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unit = (
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UNIT_PERCENTAGE
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if resource_data["units"] == "percentage"
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else resource_data["units"]
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)
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except KeyError:
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_LOGGER.error("Sensor is not available: %s", sensor)
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continue
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dev.append(
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NetdataSensor(
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netdata, name, sensor, sensor_name, element, icon, unit, invert
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)
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)
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async_add_entities(dev, True)
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class NetdataSensor(Entity):
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"""Implementation of a Netdata sensor."""
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def __init__(self, netdata, name, sensor, sensor_name, element, icon, unit, invert):
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"""Initialize the Netdata sensor."""
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self.netdata = netdata
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self._state = None
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self._sensor = sensor
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self._element = element
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self._sensor_name = self._sensor if sensor_name is None else sensor_name
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self._name = name
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self._icon = icon
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self._unit_of_measurement = unit
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self._invert = invert
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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 f"{self._name} {self._sensor_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 icon(self):
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"""Return the icon to use in the frontend, if any."""
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return self._icon
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@property
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def state(self):
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"""Return the state of the resources."""
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return self._state
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@property
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def available(self):
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"""Could the resource be accessed during the last update call."""
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return self.netdata.available
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async def async_update(self):
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"""Get the latest data from Netdata REST API."""
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await self.netdata.async_update()
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resource_data = self.netdata.api.metrics.get(self._sensor)
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self._state = round(resource_data["dimensions"][self._element]["value"], 2) * (
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-1 if self._invert else 1
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)
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class NetdataData:
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"""The class for handling the data retrieval."""
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def __init__(self, api):
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"""Initialize the data object."""
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self.api = api
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self.available = True
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@Throttle(MIN_TIME_BETWEEN_UPDATES)
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async def async_update(self):
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"""Get the latest data from the Netdata REST API."""
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try:
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await self.api.get_allmetrics()
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self.available = True
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except NetdataError:
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_LOGGER.error("Unable to retrieve data from Netdata")
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self.available = False
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