Egor
95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
"""Timezone utilities for consistent local time handling."""
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from __future__ import annotations
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import logging
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from datetime import UTC, datetime
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from functools import lru_cache
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from zoneinfo import ZoneInfo
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from app.config import settings
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logger = logging.getLogger(__name__)
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@lru_cache(maxsize=1)
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def get_local_timezone() -> ZoneInfo:
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"""Return the configured local timezone.
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Falls back to UTC if the configured timezone cannot be loaded. The
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fallback is logged once and cached for subsequent calls.
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"""
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tz_name = settings.TIMEZONE
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try:
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return ZoneInfo(tz_name)
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except Exception as exc: # pragma: no cover - defensive branch
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logger.warning(
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"⚠️ Не удалось загрузить временную зону '%s': %s. Используем UTC.",
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tz_name,
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exc,
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)
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return ZoneInfo('UTC')
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def panel_datetime_to_naive_utc(dt: datetime) -> datetime:
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"""Convert a panel datetime to naive UTC.
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Panel API returns local time with a misleading UTC offset (+00:00 / Z).
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This strips the offset, interprets the raw value as panel-local time,
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then converts to naive UTC for database storage.
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"""
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naive = dt.replace(tzinfo=None)
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localized = naive.replace(tzinfo=get_local_timezone())
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return localized.astimezone(ZoneInfo('UTC')).replace(tzinfo=None)
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def to_local_datetime(dt: datetime | None) -> datetime | None:
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"""Convert a datetime value to the configured local timezone."""
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if dt is None:
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return None
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aware_dt = dt if dt.tzinfo is not None else dt.replace(tzinfo=UTC)
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return aware_dt.astimezone(get_local_timezone())
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def format_local_datetime(
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dt: datetime | None,
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fmt: str = '%Y-%m-%d %H:%M:%S %Z',
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na_placeholder: str = 'N/A',
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) -> str:
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"""Format a datetime value in the configured local timezone."""
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localized = to_local_datetime(dt)
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if localized is None:
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return na_placeholder
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return localized.strftime(fmt)
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class TimezoneAwareFormatter(logging.Formatter):
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"""Logging formatter that renders timestamps in the configured timezone."""
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def __init__(self, *args, timezone_name: str | None = None, **kwargs):
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super().__init__(*args, **kwargs)
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if timezone_name:
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try:
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self._timezone = ZoneInfo(timezone_name)
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except Exception as exc: # pragma: no cover - defensive branch
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logger.warning(
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"⚠️ Не удалось загрузить временную зону '%s': %s. Используем UTC.",
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timezone_name,
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exc,
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)
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self._timezone = ZoneInfo('UTC')
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else:
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self._timezone = get_local_timezone()
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def formatTime(self, record, datefmt=None):
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dt = datetime.fromtimestamp(record.created, tz=self._timezone)
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if datefmt:
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return dt.strftime(datefmt)
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return dt.strftime('%Y-%m-%d %H:%M:%S,%f')[:-3]
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