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# Copyright (C) 2017 Jan Jancar
#
# This file is a part of the Mailman PGP plugin.
#
# This program 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.
#
# This program 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
# this program. If not, see <http://www.gnu.org/licenses/>.
"""Common database functions and class."""
import logging
from contextlib import contextmanager
from mailman.config import config as mailman_config
from mailman.database.transaction import transaction as mailman_transaction
from mailman.utilities.string import expand
from public import public
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
from mailman_pgp.config import config
from mailman_pgp.model.base import Base
log = logging.getLogger('mailman.plugin.pgp.database')
@public
class Database:
"""A SQLAlchemy database."""
def __init__(self):
url = config.get('db', 'url')
self._url = expand(url, None, mailman_config.paths)
log.debug('Creating database at {}'.format(self._url))
self.engine = create_engine(self._url)
self.scoped_session = scoped_session(sessionmaker(bind=self.engine))
Base.metadata.create_all(self.engine)
self.session.commit()
log.debug('Database successfully created.')
@property
def session(self):
"""
Get a scoped_session.
:return: A scoped session.
:rtype: scoped_session
"""
return self.scoped_session()
@public
@contextmanager
def transaction():
"""
A transaction context manager.
:return: A session for convenience.
:rtype: scoped_session
"""
try:
yield config.db.session
except:
config.db.session.rollback()
raise
else:
config.db.session.commit()
@public
def query(cls):
"""
A query helper.
:param cls: Class to query.
:return: A query on the class.
:rtype: sqlalchemy.orm.query.Query
"""
return config.db.session.query(cls)
mm_transaction = mailman_transaction
public(mm_transaction=mm_transaction)
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