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versatile_thermostat/custom_components/versatile_thermostat/keep_alive.py
2024-02-04 06:50:41 +00:00

55 lines
1.9 KiB
Python

"""Building blocks for the heater switch keep-alive feature.
The heater switch keep-alive feature consists of regularly refreshing the state
of directly controlled switches at a configurable interval (regularly turning the
switch 'on' or 'off' again even if it is already turned 'on' or 'off'), just like
the keep_alive setting of Home Assistant's Generic Thermostat integration:
https://www.home-assistant.io/integrations/generic_thermostat/
"""
import logging
from collections.abc import Awaitable, Callable
from datetime import timedelta, datetime
from homeassistant.core import HomeAssistant, CALLBACK_TYPE
from homeassistant.helpers.event import async_track_time_interval
_LOGGER = logging.getLogger(__name__)
class IntervalCaller:
"""Repeatedly call a given async action function at a given regular interval.
Convenience wrapper around Home Assistant's `async_track_time_interval` function.
"""
def __init__(self, hass: HomeAssistant, interval_sec: int) -> None:
self._hass = hass
self._interval_sec = interval_sec
self._remove_handle: CALLBACK_TYPE | None = None
def cancel(self):
"""Cancel the regular calls to the action function."""
if self._remove_handle:
self._remove_handle()
self._remove_handle = None
def set_async_action(self, action: Callable[[], Awaitable[None]]):
"""Set the async action function to be called at regular intervals."""
if not self._interval_sec:
return
self.cancel()
async def callback(_time: datetime):
try:
_LOGGER.debug("Calling keep-alive action")
await action()
except Exception as e: # pylint: disable=broad-exception-caught
_LOGGER.error(e)
self.cancel()
self._remove_handle = async_track_time_interval(
self._hass, callback, timedelta(seconds=self._interval_sec)
)