102 lines
2.6 KiB
Python
102 lines
2.6 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# 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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"""Session Handling for SQLAlchemy backend."""
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import sqlalchemy
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import threading
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from oslo_config import cfg
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from oslo_db import options as db_options
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from oslo_db.sqlalchemy import enginefacade
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from oslo_log import log as logging
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from oslo_utils import importutils
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from osprofiler import opts as profiler
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from sqlalchemy import inspect
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import designate.conf
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osprofiler_sqlalchemy = importutils.try_import('osprofiler.sqlalchemy')
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CONF = designate.conf.CONF
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LOG = logging.getLogger(__name__)
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try:
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CONF.import_group('profiler', 'designate.service')
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except cfg.NoSuchGroupError:
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pass
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_CONTEXT = None
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_LOCK = threading.Lock()
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_MAIN_CONTEXT_MANAGER = None
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def initialize():
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"""Initialize the module."""
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connection = CONF['storage:sqlalchemy'].connection
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db_options.set_defaults(
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CONF, connection=connection
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)
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profiler.set_defaults(CONF, enabled=False, trace_sqlalchemy=False)
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def _get_main_context_manager():
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global _LOCK
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global _MAIN_CONTEXT_MANAGER
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with _LOCK:
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if not _MAIN_CONTEXT_MANAGER:
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initialize()
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_MAIN_CONTEXT_MANAGER = enginefacade.transaction_context()
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return _MAIN_CONTEXT_MANAGER
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def _get_context():
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global _CONTEXT
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if _CONTEXT is None:
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import threading
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_CONTEXT = threading.local()
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return _CONTEXT
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def _wrap_session(sess):
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if not osprofiler_sqlalchemy:
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return sess
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if CONF.profiler.enabled and CONF.profiler.trace_sqlalchemy:
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sess = osprofiler_sqlalchemy.wrap_session(sqlalchemy, sess)
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return sess
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def get_read_engine():
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return _get_main_context_manager().reader.get_engine()
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def get_inspector():
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return inspect(get_read_engine())
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def get_read_session():
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reader = _get_main_context_manager().reader
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return _wrap_session(reader.using(_get_context()))
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def get_write_session():
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writer = _get_main_context_manager().writer
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return _wrap_session(writer.using(_get_context()))
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