6ea78ee947
DB session is now saved and reused for all db operations within an http request. Change-Id: If8975bfc7a552c545cf0412f8e0027bec0969234
66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
# Copyright (c) 2015 Mirantis Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from pecan import hooks
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from pecan import request
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from sqlalchemy.exc import InvalidRequestError
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import storyboard.common.hook_priorities as priority
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from storyboard.db.api import base
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class DBSessionHook(hooks.TransactionHook):
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priority = priority.PRE_AUTH
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def _start_session(self):
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# in_request is False because at this point we need a new session
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session = base.get_session(autocommit=False, in_request=False)
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request.session = session
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def _commit_session(self):
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if hasattr(request, "session"):
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# Commit the session
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try:
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request.session.commit()
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request.session.flush()
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except InvalidRequestError:
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# Session may have got into error state after a rollback was
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# called for a failed create or update. Skipping.
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pass
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def _rollback_session(self):
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if hasattr(request, "session"):
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try:
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request.session.rollback()
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request.session.close()
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except InvalidRequestError:
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# There may be no transactions to roll back. Skipping.
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pass
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def _clear_session(self):
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if hasattr(request, "session"):
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request.session.close()
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def is_transactional(self, state):
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return True
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def __init__(self):
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super(DBSessionHook, self).__init__(self._start_session,
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self._start_session,
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self._commit_session,
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self._rollback_session,
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self._clear_session)
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