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Fix scheduled update time-drift in data update coordinator (#32974)
* Fix scheduled update time-drift in data update coordinator As next schedule is calculated **after** the update is done, setting now + update_interval makes 1 second drift in practice, as the tick is 1Hz. * Floor the utcnow timestamp to remove sub-second error precision, and generate constant frequency updates as long as the update takes < 1s.
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@ -88,8 +88,14 @@ class DataUpdateCoordinator:
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self._unsub_refresh()
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self._unsub_refresh = None
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# We _floor_ utcnow to create a schedule on a rounded second,
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# minimizing the time between the point and the real activation.
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# That way we obtain a constant update frequency,
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# as long as the update process takes less than a second
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self._unsub_refresh = async_track_point_in_utc_time(
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self.hass, self._handle_refresh_interval, utcnow() + self.update_interval
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self.hass,
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self._handle_refresh_interval,
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utcnow().replace(microsecond=0) + self.update_interval,
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)
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async def _handle_refresh_interval(self, _now: datetime) -> None:
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