58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
# Copyright 2013 Mirantis, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
from pecan import conf
|
|
from sqlalchemy import create_engine, orm, pool
|
|
|
|
|
|
_ENGINE = None
|
|
_MAKER = None
|
|
|
|
|
|
def get_session(autocommit=True, expire_on_commit=False):
|
|
"""Return a SQLAlchemy session."""
|
|
global _MAKER
|
|
global _SLAVE_MAKER
|
|
maker = _MAKER
|
|
|
|
if maker is None:
|
|
engine = get_engine()
|
|
maker = get_maker(engine, autocommit, expire_on_commit)
|
|
|
|
else:
|
|
_MAKER = maker
|
|
|
|
session = maker()
|
|
return session
|
|
|
|
|
|
def get_engine(pool_type=None):
|
|
"""Return a SQLAlchemy engine."""
|
|
global _ENGINE
|
|
engine = _ENGINE
|
|
|
|
if engine is None:
|
|
engine = create_engine(conf.dbpath,
|
|
poolclass=pool_type or pool.NullPool)
|
|
_ENGINE = engine
|
|
return engine
|
|
|
|
|
|
def get_maker(engine, autocommit=True, expire_on_commit=False):
|
|
"""Return a SQLAlchemy sessionmaker using the given engine."""
|
|
return orm.sessionmaker(
|
|
bind=engine,
|
|
autocommit=autocommit,
|
|
expire_on_commit=expire_on_commit)
|