mirror of
https://github.com/nikdoof/homeassistant-prometheus-query.git
synced 2025-12-17 20:49:21 +00:00
93 lines
3.7 KiB
Python
93 lines
3.7 KiB
Python
import logging
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from datetime import timedelta
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import homeassistant.helpers.config_validation as cv
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import requests
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import voluptuous as vol
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from homeassistant.components.sensor import (CONF_STATE_CLASS,
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DEVICE_CLASSES_SCHEMA,
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STATE_CLASSES_SCHEMA,
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SensorEntity)
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from homeassistant.const import (CONF_DEVICE_CLASS, CONF_NAME, CONF_UNIQUE_ID,
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CONF_UNIT_OF_MEASUREMENT, STATE_UNKNOWN)
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from homeassistant.helpers.config_validation import PLATFORM_SCHEMA
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CONF_PROMETHEUS_URL = 'prometheus_url'
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CONF_PROMETHEUS_QUERY = 'prometheus_query'
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SCAN_INTERVAL = timedelta(seconds=60)
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_LOGGER = logging.getLogger(__name__)
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
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vol.Required(CONF_PROMETHEUS_URL): cv.string,
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vol.Required(CONF_PROMETHEUS_QUERY): cv.string,
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vol.Required(CONF_NAME): cv.string,
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vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
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vol.Optional(CONF_STATE_CLASS): STATE_CLASSES_SCHEMA,
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vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
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vol.Optional(CONF_UNIQUE_ID): cv.string,
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})
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def setup_platform(hass, config, add_entities, discovery_info=None):
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"""Set up the sensor platform."""
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prom_data = {
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'url': str(config.get(CONF_PROMETHEUS_URL)) + "/api/v1/query",
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'query': str(config.get(CONF_PROMETHEUS_QUERY)),
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'name': str(config.get(CONF_NAME)),
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'unit': str(config.get(CONF_UNIT_OF_MEASUREMENT)),
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'state_class': str(config.get(CONF_STATE_CLASS)),
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'device_class': str(config.get(CONF_DEVICE_CLASS)),
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'unique_id': str(config.get(CONF_UNIQUE_ID)),
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}
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add_entities([PrometheusQuery(prom_data)], True)
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class PrometheusQuery(SensorEntity):
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"""Representation of a Sensor based on Prometheus"""
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def __init__(self, prom_data):
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"""Initialize the sensor."""
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self._url = prom_data["url"]
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self._query = prom_data["query"]
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self._attr_name = prom_data["name"]
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self._state = None
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self._attr_native_unit_of_measurement = prom_data["unit"]
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self._attr_state_class = prom_data["state_class"]
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self._attr_device_class = prom_data["device_class"]
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self._attr_unique_id = f"${prom_data['url']}$${prom_data['query']}"
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if prom_data["unique_id"] is not None:
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self._attr_unique_id = prom_data["unique_id"]
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def update(self):
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"""Fetch new state data for the sensor.
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This is the only method that should fetch new data for Home Assistant.
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"""
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try:
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response = requests.get(self._url, params={'query': self._query})
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if response:
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results = response.json()['data']['result']
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if len(results):
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self._attr_native_value = results[0]['value'][1]
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else:
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_LOGGER.warning('Empty result returned for query %s', self._query)
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self._attr_native_value = STATE_UNKNOWN
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else:
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self._attr_native_value = STATE_UNKNOWN
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except requests.exceptions.JSONDecodeError:
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_LOGGER.exception("Unable to decode response from Prometheus")
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self._attr_native_value = STATE_UNKNOWN
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pass
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except requests.exceptions.ConnectionError:
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_LOGGER.error("Unable to connect to the Prometheus server at %s", self._url)
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self._attr_native_value = STATE_UNKNOWN
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pass
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except Exception:
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_LOGGER.exception("Error when retrieving update data")
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self._attr_native_value = STATE_UNKNOWN
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pass
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self._attr_state = self._attr_native_value
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