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# Copyright (C) 2007-2016 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Database type conversions."""
import uuid
from mailman import public
from sqlalchemy import Integer
from sqlalchemy.dialects import postgresql
from sqlalchemy.types import CHAR, TypeDecorator
@public
class Enum(TypeDecorator):
"""Handle Python 3.4 style enums.
Stores an integer-based Enum as an integer in the database, and
converts it on-the-fly.
"""
impl = Integer
def __init__(self, enum, *args, **kw):
super().__init__(*args, **kw)
self.enum = enum
def process_bind_param(self, value, dialect):
if value is None:
return None
return value.value
def process_result_value(self, value, dialect):
if value is None:
return None
return self.enum(value)
@public
class UUID(TypeDecorator):
"""Platform-independent GUID type.
Uses Postgresql's UUID type, otherwise uses
CHAR(32), storing as stringified hex values.
"""
impl = CHAR
def load_dialect_impl(self, dialect):
if dialect.name == 'postgresql':
return dialect.type_descriptor(postgresql.UUID())
else:
return dialect.type_descriptor(CHAR(32))
def process_bind_param(self, value, dialect):
if value is None:
return value
elif dialect.name == 'postgresql':
return str(value)
else:
if not isinstance(value, uuid.UUID):
value = uuid.UUID(value)
return '%.32x' % value.int
def process_result_value(self, value, dialect):
if value is None:
return value
else:
return uuid.UUID(value)
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