57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
# Copyright 2014, Big Switch Networks
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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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import sqlalchemy as sa
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from neutron.db import api as db
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from neutron.db import model_base
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from neutron.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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'''
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A simple table to store the latest consistency hash
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received from a server in case neutron gets restarted.
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'''
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class ConsistencyHash(model_base.BASEV2):
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'''
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For now we only support one global state so the
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hash_id will always be '1'
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'''
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__tablename__ = 'consistencyhashes'
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hash_id = sa.Column(sa.String(255),
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primary_key=True)
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hash = sa.Column(sa.String(255), nullable=False)
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def get_consistency_hash(hash_id='1'):
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session = db.get_session()
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with session.begin(subtransactions=True):
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query = session.query(ConsistencyHash)
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res = query.filter_by(hash_id=hash_id).first()
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if not res:
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return False
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return res.hash
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def put_consistency_hash(hash, hash_id='1'):
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session = db.get_session()
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with session.begin(subtransactions=True):
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conhash = ConsistencyHash(hash_id=hash_id, hash=hash)
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session.merge(conhash)
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LOG.debug(_("Consistency hash for group %(hash_id)s updated "
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"to %(hash)s"), {'hash_id': hash_id, 'hash': hash})
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