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# Copyright 2012 New Dream Network, LLC (DreamHost)
#
# 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 alembic import context
from neutron_lib.db import model_base
from oslo_config import cfg
import sqlalchemy as sa
from sqlalchemy import event # noqa
from neutron.db.migration.alembic_migrations import external
from neutron.db.migration import autogen
from neutron.db.migration.connection import DBConnection
from neutron.db.migration.models import head # noqa
try:
# NOTE(mriedem): This is to register the DB2 alembic code which
# is an optional runtime dependency.
from ibm_db_alembic.ibm_db import IbmDbImpl # noqa # pylint: disable=unused-import
except ImportError:
pass
MYSQL_ENGINE = None
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
neutron_config = config.neutron_config
# set the target for 'autogenerate' support
target_metadata = model_base.BASEV2.metadata
def set_mysql_engine():
try:
mysql_engine = neutron_config.command.mysql_engine
except cfg.NoSuchOptError:
mysql_engine = None
global MYSQL_ENGINE
MYSQL_ENGINE = (mysql_engine or
model_base.BASEV2.__table_args__['mysql_engine'])
def include_object(object_, name, type_, reflected, compare_to):
if type_ == 'table' and name in external.TABLES:
return False
elif type_ == 'index' and reflected and name.startswith("idx_autoinc_"):
# skip indexes created by SQLAlchemy autoincrement=True
# on composite PK integer columns
return False
else:
return True
def run_migrations_offline():
"""Run migrations in 'offline' mode.
This configures the context with either a URL
or an Engine.
Calls to context.execute() here emit the given string to the
script output.
"""
set_mysql_engine()
kwargs = dict()
if neutron_config.database.connection:
kwargs['url'] = neutron_config.database.connection
else:
kwargs['dialect_name'] = neutron_config.database.engine
kwargs['include_object'] = include_object
context.configure(**kwargs)
with context.begin_transaction():
context.run_migrations()
@event.listens_for(sa.Table, 'after_parent_attach')
def set_storage_engine(target, parent):
if MYSQL_ENGINE:
target.kwargs['mysql_engine'] = MYSQL_ENGINE
def run_migrations_online():
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
set_mysql_engine()
connection = config.attributes.get('connection')
with DBConnection(neutron_config.database.connection, connection) as conn:
context.configure(
connection=conn,
target_metadata=target_metadata,
include_object=include_object,
process_revision_directives=autogen.process_revision_directives
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()
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