core/homeassistant/components/sql/sensor.py

292 lines
8.9 KiB
Python

"""Sensor from an SQL Query."""
from __future__ import annotations
from datetime import date
import decimal
import logging
import sqlalchemy
from sqlalchemy.engine import Result
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.orm import Session, scoped_session, sessionmaker
from homeassistant.components.recorder import CONF_DB_URL, get_instance
from homeassistant.components.sensor import (
CONF_STATE_CLASS,
SensorDeviceClass,
SensorEntity,
SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
CONF_DEVICE_CLASS,
CONF_NAME,
CONF_UNIQUE_ID,
CONF_UNIT_OF_MEASUREMENT,
CONF_VALUE_TEMPLATE,
)
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import TemplateError
from homeassistant.helpers.device_registry import DeviceEntryType
from homeassistant.helpers.entity import DeviceInfo
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.template import Template
from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
from .const import CONF_COLUMN_NAME, CONF_QUERY, DB_URL_RE, DOMAIN
from .util import resolve_db_url
_LOGGER = logging.getLogger(__name__)
def redact_credentials(data: str) -> str:
"""Redact credentials from string data."""
return DB_URL_RE.sub("//****:****@", data)
async def async_setup_platform(
hass: HomeAssistant,
config: ConfigType,
async_add_entities: AddEntitiesCallback,
discovery_info: DiscoveryInfoType | None = None,
) -> None:
"""Set up the SQL sensor from yaml."""
if (conf := discovery_info) is None:
return
name: str = conf[CONF_NAME]
query_str: str = conf[CONF_QUERY]
unit: str | None = conf.get(CONF_UNIT_OF_MEASUREMENT)
value_template: Template | None = conf.get(CONF_VALUE_TEMPLATE)
column_name: str = conf[CONF_COLUMN_NAME]
unique_id: str | None = conf.get(CONF_UNIQUE_ID)
db_url: str = resolve_db_url(hass, conf.get(CONF_DB_URL))
device_class: SensorDeviceClass | None = conf.get(CONF_DEVICE_CLASS)
state_class: SensorStateClass | None = conf.get(CONF_STATE_CLASS)
if value_template is not None:
value_template.hass = hass
await async_setup_sensor(
hass,
name,
query_str,
column_name,
unit,
value_template,
unique_id,
db_url,
True,
device_class,
state_class,
async_add_entities,
)
async def async_setup_entry(
hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
) -> None:
"""Set up the SQL sensor from config entry."""
db_url: str = resolve_db_url(hass, entry.options.get(CONF_DB_URL))
name: str = entry.options[CONF_NAME]
query_str: str = entry.options[CONF_QUERY]
unit: str | None = entry.options.get(CONF_UNIT_OF_MEASUREMENT)
template: str | None = entry.options.get(CONF_VALUE_TEMPLATE)
column_name: str = entry.options[CONF_COLUMN_NAME]
value_template: Template | None = None
if template is not None:
try:
value_template = Template(template)
value_template.ensure_valid()
except TemplateError:
value_template = None
if value_template is not None:
value_template.hass = hass
await async_setup_sensor(
hass,
name,
query_str,
column_name,
unit,
value_template,
entry.entry_id,
db_url,
False,
None,
None,
async_add_entities,
)
async def async_setup_sensor(
hass: HomeAssistant,
name: str,
query_str: str,
column_name: str,
unit: str | None,
value_template: Template | None,
unique_id: str | None,
db_url: str,
yaml: bool,
device_class: SensorDeviceClass | None,
state_class: SensorStateClass | None,
async_add_entities: AddEntitiesCallback,
) -> None:
"""Set up the SQL sensor."""
instance = get_instance(hass)
sessmaker: scoped_session | None
if use_database_executor := (db_url == instance.db_url):
assert instance.engine is not None
sessmaker = scoped_session(sessionmaker(bind=instance.engine, future=True))
elif not (
sessmaker := await hass.async_add_executor_job(
_validate_and_get_session_maker_for_db_url, db_url
)
):
return
# MSSQL uses TOP and not LIMIT
if not ("LIMIT" in query_str.upper() or "SELECT TOP" in query_str.upper()):
if "mssql" in db_url:
query_str = query_str.upper().replace("SELECT", "SELECT TOP 1")
else:
query_str = query_str.replace(";", "") + " LIMIT 1;"
async_add_entities(
[
SQLSensor(
name,
sessmaker,
query_str,
column_name,
unit,
value_template,
unique_id,
yaml,
device_class,
state_class,
use_database_executor,
)
],
True,
)
def _validate_and_get_session_maker_for_db_url(db_url: str) -> scoped_session | None:
"""Validate the db_url and return a session maker.
This does I/O and should be run in the executor.
"""
try:
engine = sqlalchemy.create_engine(db_url, future=True)
sessmaker = scoped_session(sessionmaker(bind=engine, future=True))
# Run a dummy query just to test the db_url
sess: Session = sessmaker()
sess.execute(sqlalchemy.text("SELECT 1;"))
except SQLAlchemyError as err:
_LOGGER.error(
"Couldn't connect using %s DB_URL: %s",
redact_credentials(db_url),
redact_credentials(str(err)),
)
return None
else:
return sessmaker
finally:
if sess:
sess.close()
class SQLSensor(SensorEntity):
"""Representation of an SQL sensor."""
_attr_icon = "mdi:database-search"
_attr_has_entity_name = True
def __init__(
self,
name: str,
sessmaker: scoped_session,
query: str,
column: str,
unit: str | None,
value_template: Template | None,
unique_id: str | None,
yaml: bool,
device_class: SensorDeviceClass | None,
state_class: SensorStateClass | None,
use_database_executor: bool,
) -> None:
"""Initialize the SQL sensor."""
self._query = query
self._attr_name = name if yaml else None
self._attr_native_unit_of_measurement = unit
self._attr_device_class = device_class
self._attr_state_class = state_class
self._template = value_template
self._column_name = column
self.sessionmaker = sessmaker
self._attr_extra_state_attributes = {}
self._attr_unique_id = unique_id
self._use_database_executor = use_database_executor
if not yaml and unique_id:
self._attr_device_info = DeviceInfo(
entry_type=DeviceEntryType.SERVICE,
identifiers={(DOMAIN, unique_id)},
manufacturer="SQL",
name=name,
)
async def async_update(self) -> None:
"""Retrieve sensor data from the query using the right executor."""
if self._use_database_executor:
await get_instance(self.hass).async_add_executor_job(self._update)
else:
await self.hass.async_add_executor_job(self._update)
def _update(self) -> None:
"""Retrieve sensor data from the query."""
data = None
self._attr_extra_state_attributes = {}
sess: scoped_session = self.sessionmaker()
try:
result: Result = sess.execute(sqlalchemy.text(self._query))
except SQLAlchemyError as err:
_LOGGER.error(
"Error executing query %s: %s",
self._query,
redact_credentials(str(err)),
)
return
for res in result.mappings():
_LOGGER.debug("Query %s result in %s", self._query, res.items())
data = res[self._column_name]
for key, value in res.items():
if isinstance(value, decimal.Decimal):
value = float(value)
elif isinstance(value, date):
value = value.isoformat()
elif isinstance(value, (bytes, bytearray)):
value = f"0x{value.hex()}"
self._attr_extra_state_attributes[key] = value
if data is not None and isinstance(data, (bytes, bytearray)):
data = f"0x{data.hex()}"
if data is not None and self._template is not None:
self._attr_native_value = (
self._template.async_render_with_possible_json_value(data, None)
)
else:
self._attr_native_value = data
if data is None:
_LOGGER.warning("%s returned no results", self._query)
sess.close()