62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
# Copyright 2013 Red Hat, Inc.
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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 re
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from migrate.changeset import UniqueConstraint
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from oslo_db import exception as db_exception
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from sqlalchemy import MetaData, Table
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from sqlalchemy.exc import OperationalError, ProgrammingError
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NEW_KEYNAME = 'image_members_image_id_member_deleted_at_key'
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ORIGINAL_KEYNAME_RE = re.compile('image_members_image_id.*_key')
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def upgrade(migrate_engine):
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image_members = _get_image_members_table(migrate_engine)
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if migrate_engine.name in ('mysql', 'postgresql'):
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try:
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UniqueConstraint('image_id',
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name=_get_original_keyname(migrate_engine.name),
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table=image_members).drop()
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except (OperationalError, ProgrammingError, db_exception.DBError):
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UniqueConstraint('image_id',
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name=_infer_original_keyname(image_members),
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table=image_members).drop()
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UniqueConstraint('image_id',
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'member',
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'deleted_at',
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name=NEW_KEYNAME,
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table=image_members).create()
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def _get_image_members_table(migrate_engine):
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meta = MetaData()
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meta.bind = migrate_engine
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return Table('image_members', meta, autoload=True)
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def _get_original_keyname(db):
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return {'mysql': 'image_id',
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'postgresql': 'image_members_image_id_member_key'}[db]
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def _infer_original_keyname(table):
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for i in table.indexes:
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if ORIGINAL_KEYNAME_RE.match(i.name):
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return i.name
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