112 lines
3.4 KiB
Python
112 lines
3.4 KiB
Python
# 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 os
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import alembic
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from alembic import config as alembic_config
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import alembic.migration as alembic_migration
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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 oslo_db.sqlalchemy.migration_cli import manager
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from gyan.db.sqlalchemy import models
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import gyan.conf
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_MANAGER = None
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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 get_manager():
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global _MANAGER
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if not _MANAGER:
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alembic_path = os.path.abspath(
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os.path.join(os.path.dirname(__file__), 'alembic.ini'))
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migrate_path = os.path.abspath(
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os.path.join(os.path.dirname(__file__), 'alembic'))
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migration_config = {'alembic_ini_path': alembic_path,
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'alembic_repo_path': migrate_path,
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'db_url': gyan.conf.CONF.database.connection}
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_MANAGER = manager.MigrationManager(migration_config)
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return _MANAGER
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def version(config=None, engine=None):
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"""Current database version.
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:returns: Database version
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:rtype: string
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"""
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if engine is None:
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engine = enginefacade.get_legacy_facade().get_engine()
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with engine.connect() as conn:
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context = alembic_migration.MigrationContext.configure(conn)
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return context.get_current_revision()
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def upgrade(version):
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"""Used for upgrading database.
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:param version: Desired database version
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:type version: string
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"""
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version = version or 'head'
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get_manager().upgrade(version)
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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 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.get_legacy_facade().get_engine()
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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):
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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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return get_manager().revision(message=message, autogenerate=autogenerate)
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