89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import sys
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from oslo_config import cfg
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from oslo_db.sqlalchemy import enginefacade
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from oslo_log import log
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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main_context_manager = enginefacade.transaction_context()
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api_context_manager = enginefacade.transaction_context()
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def _get_db_conf(conf_group, connection=None):
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kw = dict(
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connection=connection or conf_group.connection,
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slave_connection=conf_group.slave_connection,
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sqlite_fk=False,
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__autocommit=True,
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expire_on_commit=False,
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mysql_sql_mode=conf_group.mysql_sql_mode,
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connection_recycle_time=conf_group.connection_recycle_time,
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connection_debug=conf_group.connection_debug,
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max_pool_size=conf_group.max_pool_size,
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max_overflow=conf_group.max_overflow,
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pool_timeout=conf_group.pool_timeout,
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sqlite_synchronous=conf_group.sqlite_synchronous,
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connection_trace=conf_group.connection_trace,
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max_retries=conf_group.max_retries,
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retry_interval=conf_group.retry_interval)
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return kw
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def get_backend():
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return sys.modules[__name__]
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def create_context_manager(connection=None):
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"""Create a database context manager object.
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: param connection: The database connection string
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"""
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ctxt_mgr = enginefacade.transaction_context()
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ctxt_mgr.configure(**_get_db_conf(CONF.database, connection=connection))
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return ctxt_mgr
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def _context_manager_from_context(context):
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if context:
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try:
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return context.db_connection
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except AttributeError:
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pass
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def get_context_manager(context):
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"""Get a database context manager object.
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:param context: The request context that can contain a context manager
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"""
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return _context_manager_from_context(context) or main_context_manager
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def get_engine(use_slave=False, context=None):
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"""Get a database engine object.
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:param use_slave: Whether to use the slave connection
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:param context: The request context that can contain a context manager
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"""
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ctxt_mgr = get_context_manager(context)
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return ctxt_mgr.get_legacy_facade().get_engine(use_slave=use_slave)
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def get_api_engine():
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return api_context_manager.get_legacy_facade().get_engine()
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