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# Copyright (C) 2006-2012 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/>.
"""Base class for all database classes."""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'Model',
]
import sys
from operator import attrgetter
from storm.properties import PropertyPublisherMeta
class ModelMeta(PropertyPublisherMeta):
"""Do more magic on table classes."""
_class_registry = set()
def __init__(self, name, bases, dict):
# Before we let the base class do it's thing, force an __storm_table__
# property to enforce our table naming convention.
self.__storm_table__ = name.lower()
super(ModelMeta, self).__init__(name, bases, dict)
# Register the model class so that it can be more easily cleared.
# This is required by the test framework.
if name == 'Model':
return
ModelMeta._class_registry.add(self)
@staticmethod
def _reset(store):
from mailman.config import config
from mailman.model.version import Version
config.db._pre_reset(store)
# Give each schema migration a chance to do its pre-reset. See below
# for calling its post reset too.
versions = sorted(version.version for version in
store.find(Version, component='schema'))
migrations = {}
for version in versions:
# We have to give the migrations module that loaded this version a
# chance to do both pre- and post-reset operations. The following
# find the actual the module path for the migration. See
# StormBaseDatabase.load_schema().
migration = store.find(Version, component=version).one()
if migration is None:
continue
migrations[version] = module_path = migration.version
module = sys.modules[module_path]
pre_reset = getattr(module, 'pre_reset', None)
if pre_reset is not None:
pre_reset(store)
# Make sure this is deterministic, by sorting on the storm table name.
classes = sorted(ModelMeta._class_registry,
key=attrgetter('__storm_table__'))
for model_class in classes:
store.find(model_class).remove()
# Now give each migration a chance to do post-reset operations.
for version in versions:
module = sys.modules[migrations[version]]
post_reset = getattr(module, 'post_reset', None)
if post_reset is not None:
post_reset(store)
config.db._post_reset(store)
class Model:
"""Like Storm's `Storm` subclass, but with a bit extra."""
__metaclass__ = ModelMeta
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