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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2013 OpenStack LLC
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import sqlalchemy
from sqlalchemy.orm import sessionmaker
def upgrade(migrate_engine):
if migrate_engine.name == 'sqlite':
drop_credential_table_foreign_key_constraints_for_sqlite(
migrate_engine)
def downgrade(migrate_engine):
if migrate_engine.name == 'sqlite':
add_credential_table_foreign_key_constraints_for_sqlite(migrate_engine)
def drop_credential_table_foreign_key_constraints_for_sqlite(migrate_engine):
meta = sqlalchemy.MetaData()
meta.bind = migrate_engine
# NOTE(nachiappan): SQLite does not support ALTER TABLE DROP constraint.
# So we need to move the data to new credenital table
# created without constraints, drop the old table and
# rename the new table to credential.
sqlalchemy.Table('user', meta, autoload=True)
tenant_table = sqlalchemy.Table(
'tenant',
meta,
sqlalchemy.Column('id', sqlalchemy.String(64), primary_key=True),
sqlalchemy.Column(
'name', sqlalchemy.String(64), unique=True, nullable=False),
sqlalchemy.Column('extra', sqlalchemy.Text()))
tenant_table.create(migrate_engine, checkfirst=True)
cred_table = sqlalchemy.Table('credential', meta, autoload=True)
session = sessionmaker(bind=migrate_engine)()
new_credential_table = sqlalchemy.Table(
'new_credential',
meta,
sqlalchemy.Column('id', sqlalchemy.String(64), primary_key=True),
sqlalchemy.Column('user_id',
sqlalchemy.String(64),
nullable=False),
sqlalchemy.Column('project_id',
sqlalchemy.String(64)),
sqlalchemy.Column('blob', sqlalchemy.Text(), nullable=False),
sqlalchemy.Column('type', sqlalchemy.String(255), nullable=False),
sqlalchemy.Column('extra', sqlalchemy.Text()))
new_credential_table.create(migrate_engine, checkfirst=True)
insert = new_credential_table.insert()
for credential in session.query(cred_table):
insert.execute({'id': credential.id,
'user_id': credential.user_id,
'project_id': credential.project_id,
'blob': credential.blob,
'type': credential.type,
'extra': credential.extra})
cred_table.drop()
tenant_table.drop()
new_credential_table.rename('credential')
session.commit()
session.close()
def add_credential_table_foreign_key_constraints_for_sqlite(migrate_engine):
meta = sqlalchemy.MetaData()
meta.bind = migrate_engine
cred_table = sqlalchemy.Table('credential', meta, autoload=True)
sqlalchemy.Table('user', meta, autoload=True)
session = sessionmaker(bind=migrate_engine)()
old_credential_table = sqlalchemy.Table(
'old_credential',
meta,
sqlalchemy.Column('id', sqlalchemy.String(64), primary_key=True),
sqlalchemy.Column('user_id',
sqlalchemy.String(64),
sqlalchemy.ForeignKey('user.id'),
nullable=False),
# NOTE(nachiappan): Not creating the foreign key constraint with
# project table as version 15 conflicts with
# version 7.
sqlalchemy.Column('project_id',
sqlalchemy.String(64)),
sqlalchemy.Column('blob', sqlalchemy.Text(), nullable=False),
sqlalchemy.Column('type', sqlalchemy.String(255), nullable=False),
sqlalchemy.Column('extra', sqlalchemy.Text()))
old_credential_table.create(migrate_engine, checkfirst=True)
insert = old_credential_table.insert()
for credential in session.query(cred_table):
insert.execute({'id': credential.id,
'user_id': credential.user_id,
'project_id': credential.project_id,
'blob': credential.blob,
'type': credential.type,
'extra': credential.extra})
cred_table.drop()
old_credential_table.rename('credential')
session.commit()
session.close()
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