Holiday update calendar once per day

homeassistant/components/holiday/calendar.py

@@ -2,16 +2,17 @@
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timedelta
 
 from holidays import HolidayBase, country_holidays
 
 from homeassistant.components.calendar import CalendarEntity, CalendarEvent
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_COUNTRY
-from homeassistant.core import HomeAssistant
+from homeassistant.core import CALLBACK_TYPE, HomeAssistant, callback
 from homeassistant.helpers.device_registry import DeviceEntryType, DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.event import async_track_point_in_utc_time
 from homeassistant.util import dt as dt_util
 
 from .const import CONF_PROVINCE, DOMAIN
@@ -77,6 +78,9 @@ class HolidayCalendarEntity(CalendarEntity):
 
  _attr_has_entity_name = True
  _attr_name = None
+ _attr_event: CalendarEvent | None = None
+ _attr_should_poll = False
+ unsub: CALLBACK_TYPE | None = None
 
  def __init__(
  self,
@@ -100,14 +104,36 @@ def __init__(
  )
  self._obj_holidays = obj_holidays
 
- @property
- def event(self) -> CalendarEvent | None:
+ def get_next_interval(self, now: datetime) -> datetime:
+ """Compute next time an update should occur."""
+ tomorrow = dt_util.as_local(now) + timedelta(days=1)
+ return dt_util.start_of_local_day(tomorrow)
+
+ def _update_state_and_setup_listener(self) -> None:
+ """Update state and setup listener for next interval."""
+ now = dt_util.utcnow()
+ self._attr_event = self.update_event(now)
+ self.unsub = async_track_point_in_utc_time(
+ self.hass, self.point_in_time_listener, self.get_next_interval(now)
+ )
+
+ @callback
+ def point_in_time_listener(self, time_date: datetime) -> None:
+ """Get the latest data and update state."""
+ self._update_state_and_setup_listener()
+ self.async_write_ha_state()
+
+ async def async_added_to_hass(self) -> None:
+ """Set up first update."""
+ self._update_state_and_setup_listener()
+
+ def update_event(self, now: datetime) -> CalendarEvent | None:
  """Return the next upcoming event."""
  next_holiday = None
  for holiday_date, holiday_name in sorted(
  self._obj_holidays.items(), key=lambda x: x[0]
  ):
- if holiday_date >= dt_util.now().date():
+ if holiday_date >= now.date():
  next_holiday = (holiday_date, holiday_name)
  break
 
@@ -121,6 +147,11 @@ def event(self) -> CalendarEvent | None:
  location=self._location,
  )
 
+ @property
+ def event(self) -> CalendarEvent | None:
+ """Return the next upcoming event."""
+ return self._attr_event
+
  async def async_get_events(
  self, hass: HomeAssistant, start_date: datetime, end_date: datetime
  ) -> list[CalendarEvent]: