56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
# Copyright 2020 OpenStack Foundation
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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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#
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from alembic import op
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from neutron_lib import constants
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"""limit vlan allocation id values
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Revision ID: dfe425060830
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Revises: d8bdf05313f4
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Create Date: 2020-04-27 16:58:33.110194
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"""
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# revision identifiers, used by Alembic.
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revision = 'dfe425060830'
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down_revision = 'd8bdf05313f4'
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# NOTE(ralonsoh): "CHECK CONSTRAINT" is a feature heterogeneously implemented
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# in different database engines and versions. For example:
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# - MySQL: since version 8.0.16 (April 2019)
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# https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-16.html
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# - MariaDB: since version 10.2.1 (July 2016)
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# https://mariadb.com/kb/en/mariadb-1021-release-notes/
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# - PostgreSQL: since version 9.4 (December 2014)
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# https://www.postgresql.org/docs/9.4/ddl-constraints.html
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#
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# If the DB engine does not support yet this feature, it will be ignored. The
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# VLAN tag constraint is enforced in the Neutron API. This extra enforcement
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# in the DB engine wants to mimic the limitation imposed in the API side and
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# avoid any spurious modification.
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def upgrade():
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# https://docs.sqlalchemy.org/en/13/core/constraints.html#check-constraint
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constraint = ('vlan_id>=%(min_vlan)s AND vlan_id<=%(max_vlan)s' %
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{'min_vlan': constants.MIN_VLAN_TAG,
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'max_vlan': constants.MAX_VLAN_TAG})
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op.create_check_constraint(
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constraint_name='check_ml2_vlan_allocations0vlan_id',
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table_name='ml2_vlan_allocations',
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condition=constraint)
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