Add support of datastore types

implements blueprint db-type-version

Change-Id: Ie87f72b898e993044803e7b37cad78372c2cd3f4

trove/db/sqlalchemy/migrate_repo/versions/016_add_datastore_type.py

@@ -0,0 +1,76 @@
+# Copyright 2012 OpenStack Foundation
+#
+#    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.
+
+from sqlalchemy import ForeignKey
+from sqlalchemy.schema import Column
+from sqlalchemy.schema import MetaData
+from sqlalchemy.schema import UniqueConstraint
+
+from trove.db.sqlalchemy.migrate_repo.schema import Boolean
+from trove.db.sqlalchemy.migrate_repo.schema import create_tables
+from trove.db.sqlalchemy.migrate_repo.schema import DateTime
+from trove.db.sqlalchemy.migrate_repo.schema import drop_tables
+from trove.db.sqlalchemy.migrate_repo.schema import Integer
+from trove.db.sqlalchemy.migrate_repo.schema import BigInteger
+from trove.db.sqlalchemy.migrate_repo.schema import String
+from trove.db.sqlalchemy.migrate_repo.schema import Table
+
+
+meta = MetaData()
+
+
+datastores = Table(
+    'datastores',
+    meta,
+    Column('id', String(36), primary_key=True, nullable=False),
+    Column('name', String(255), unique=True),
+    Column('manager', String(255), nullable=False),
+    Column('default_version_id', String(36)),
+)
+
+
+datastore_versions = Table(
+    'datastore_versions',
+    meta,
+    Column('id', String(36), primary_key=True, nullable=False),
+    Column('datastore_id', String(36), ForeignKey('datastores.id')),
+    Column('name', String(255), unique=True),
+    Column('image_id', String(36), nullable=False),
+    Column('packages', String(511)),
+    Column('active', Boolean(), nullable=False),
+    UniqueConstraint('datastore_id', 'name', name='ds_versions')
+)
+
+
+def upgrade(migrate_engine):
+    meta.bind = migrate_engine
+    create_tables([datastores, datastore_versions])
+    instances = Table('instances', meta, autoload=True)
+    datastore_version_id = Column('datastore_version_id', String(36),
+                                  ForeignKey('datastore_versions.id'))
+    instances.create_column(datastore_version_id)
+    instances.drop_column('service_type')
+    # Table 'service_images' is deprecated since this version.
+    # Leave it for few releases.
+    #drop_tables([service_images])
+
+
+def downgrade(migrate_engine):
+    meta.bind = migrate_engine
+    drop_tables([datastores, datastore_versions])
+    instances = Table('instances', meta, autoload=True)
+    instances.drop_column('datastore_version_id')
+    service_type = Column('service_type', String(36))
+    instances.create_column(service_type)
+    instances.update().values({'service_type': 'mysql'}).execute()