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# 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 stevedore import enabled
MIGRATION_NAMESPACE = 'oslo.db.migration'
def check_plugin_enabled(ext):
"""Used for EnabledExtensionManager."""
return ext.obj.enabled
class MigrationManager(object):
def __init__(self, migration_config):
self._manager = enabled.EnabledExtensionManager(
MIGRATION_NAMESPACE,
check_plugin_enabled,
invoke_kwds={'migration_config': migration_config},
invoke_on_load=True
)
if not self._plugins:
raise ValueError('There must be at least one plugin active.')
@property
def _plugins(self):
return sorted(ext.obj for ext in self._manager.extensions)
def upgrade(self, revision):
"""Upgrade database with all available backends."""
results = []
for plugin in self._plugins:
results.append(plugin.upgrade(revision))
return results
def downgrade(self, revision):
"""Downgrade database with available backends."""
# downgrading should be performed in reversed order
results = []
for plugin in reversed(self._plugins):
results.append(plugin.downgrade(revision))
return results
def version(self):
"""Return last version of db."""
last = None
for plugin in self._plugins:
version = plugin.version()
if version:
last = version
return last
def revision(self, message, autogenerate):
"""Generate template or autogenerated revision."""
# revision should be done only by last plugin
return self._plugins[-1].revision(message, autogenerate)
def stamp(self, revision):
"""Create stamp for a given revision."""
return self._plugins[-1].stamp(revision)
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