98 lines
3.5 KiB
Python
98 lines
3.5 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 sqlalchemy import and_, func, orm
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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 == 'mysql' or
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migrate_engine.name == '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):
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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 downgrade(migrate_engine):
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image_members = _get_image_members_table(migrate_engine)
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if (migrate_engine.name == 'mysql' or
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migrate_engine.name == 'postgresql'):
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_sanitize(migrate_engine, image_members)
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UniqueConstraint('image_id',
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name=NEW_KEYNAME,
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table=image_members).drop()
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UniqueConstraint('image_id',
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'member',
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name=_get_original_keyname(migrate_engine.name),
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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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def _sanitize(migrate_engine, table):
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"""
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Avoid possible integrity error by removing deleted rows
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to accommdate less restrictive uniqueness constraint
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"""
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session = orm.sessionmaker(bind=migrate_engine)()
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# find the image_member rows containing duplicate combinations
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# of image_id and member
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qry = (session.query(table.c.image_id, table.c.member)
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.group_by(table.c.image_id, table.c.member)
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.having(func.count() > 1))
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for image_id, member in qry:
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# only remove duplicate rows already marked deleted
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d = table.delete().where(and_(table.c.deleted == True,
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table.c.image_id == image_id,
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table.c.member == member))
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d.execute()
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session.close()
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