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import datetime
from sqlalchemy.types import DateTime, TypeDecorator
from .timezone import utc
class UtcDateTime(TypeDecorator):
"""Almost equivalent to :class:`~sqlalchemy.types.DateTime` with
``timezone=True`` option, but it differs from that by:
- Never silently take naive :class:`~datetime.datetime`, instead it
always raise :exc:`ValueError` unless time zone aware value.
- :class:`~datetime.datetime` value's :attr:`~datetime.datetime.tzinfo`
is always converted to UTC.
- Unlike SQLAlchemy's built-in :class:`~sqlalchemy.types.DateTime`,
it never return naive :class:`~datetime.datetime`, but time zone
aware value, even with SQLite or MySQL.
"""
impl = DateTime(timezone=True)
cache_ok = True
def process_bind_param(self, value, dialect):
if value is not None:
if not isinstance(value, datetime.datetime):
raise TypeError('expected datetime.datetime, not ' +
repr(value))
elif value.tzinfo is None:
raise ValueError('naive datetime is disallowed')
return value.astimezone(utc)
def process_result_value(self, value, dialect):
if value is not None:
if value.tzinfo is None:
value = value.replace(tzinfo=utc)
else:
value = value.astimezone(utc)
return value
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