92 lines
3.0 KiB
Python
92 lines
3.0 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from alembic import command as alembic_command
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from alembic import config as alembic_config
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from alembic import migration as alembic_migrations
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from oslo_config import cfg
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from oslo_db import exception as db_exc
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from oslo_db.sqlalchemy import enginefacade
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from vitrage.storage.sqlalchemy import models
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CONF = cfg.CONF
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def _alembic_config():
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path = os.path.join(os.path.dirname(__file__), 'alembic.ini')
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config = alembic_config.Config(path)
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return config
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def create_schema(config=None, engine=None):
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"""Create database schema from models description.
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Can be used for initial installation instead of upgrade('head').
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"""
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if engine is None:
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engine = enginefacade.writer.get_engine()
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# NOTE(viktors): If we will use metadata.create_all() for non empty db
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# schema, it will only add the new tables, but leave
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# existing as is. So we should avoid of this situation.
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if version(engine=engine) is not None:
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raise db_exc.DBMigrationError("DB schema is already under version"
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" control. Use upgrade() instead")
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models.Base.metadata.create_all(engine)
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stamp('head', config=config)
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def revision(message=None, autogenerate=False, config=None):
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"""Creates template for migration.
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:param message: Text that will be used for migration title
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:type message: string
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:param autogenerate: If True - generates diff based on current database
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state
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:type autogenerate: bool
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"""
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config = config or _alembic_config()
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return alembic_command.revision(config, message=message,
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autogenerate=autogenerate)
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def stamp(revision, config=None):
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"""Stamps database with provided revision.
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Don't run any migrations.
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:param revision: Should match one from repository or head - to stamp
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database with most recent revision
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:type revision: string
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"""
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config = config or _alembic_config()
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return alembic_command.stamp(config, revision=revision)
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def upgrade(revision):
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config = _alembic_config()
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alembic_command.upgrade(config, revision)
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def version(config=None, engine=None):
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if engine is None:
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engine = enginefacade.writer.get_engine()
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with engine.connect() as conn:
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context = alembic_migrations.MigrationContext.configure(conn)
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return context.get_current_revision()
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