41b4490a41
implements blueprint quantum-db-upgrades This changeset provide database migration capabilities to Quantum by wrapping the Alembic library. Change-Id: I8ba3a07f5a65e0fda9c0e85ed9c07c5978c53bc7
101 lines
2.9 KiB
Python
101 lines
2.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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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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#
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# @author: Mark McClain, DreamHost
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from logging.config import fileConfig
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from alembic import context
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from sqlalchemy import create_engine, pool
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from quantum.db import model_base
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from quantum.openstack.common import importutils
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DATABASE_QUOTA_DRIVER = 'quantum.extensions._quotav2_driver.DbQuotaDriver'
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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quantum_config = config.quantum_config
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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fileConfig(config.config_file_name)
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plugin_klass = importutils.import_class(quantum_config.core_plugin)
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# set the target for 'autogenerate' support
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target_metadata = model_base.BASEV2.metadata
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def run_migrations_offline():
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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"""
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context.configure(url=quantum_config.DATABASE.sql_connection)
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with context.begin_transaction():
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context.run_migrations(active_plugin=quantum_config.core_plugin,
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options=build_options())
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def run_migrations_online():
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"""Run migrations in 'online' mode.
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In this scenario we need to create an Engine
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and associate a connection with the context.
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"""
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engine = create_engine(
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quantum_config.DATABASE.sql_connection,
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poolclass=pool.NullPool)
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connection = engine.connect()
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context.configure(
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connection=connection,
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target_metadata=target_metadata
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)
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try:
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with context.begin_transaction():
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context.run_migrations(active_plugin=quantum_config.core_plugin,
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options=build_options())
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finally:
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connection.close()
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def build_options():
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return {'folsom_quota_db_enabled': is_db_quota_enabled()}
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def is_db_quota_enabled():
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return quantum_config.QUOTAS.quota_driver == DATABASE_QUOTA_DRIVER
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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