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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.
import abc
import threading
import time
class BaseOvnDbSynchronizer(metaclass=abc.ABCMeta):
_required_mechanism_drivers = []
_required_service_plugins = []
_required_ml2_ext_drivers = []
def __init__(self, core_plugin, ovn_driver, mode, is_maintenance=False):
"""Initialize the OVN DB synchronizer.
:param core_plugin: The Neutron core plugin instance
:param ovn_driver: The OVN driver instance containing the OVN NB and SB
API clients
:param mode: The synchronization mode, valid values are:
'off', 'log', 'repair' or 'migrate'
:param is_maintenance: Flag indicating if running in maintenance mode.
Defaults to False
"""
self.core_plugin = core_plugin
self.ovn_nb_api = ovn_driver.nb_ovn
self.ovn_sb_api = ovn_driver.sb_ovn
self.ovn_driver = ovn_driver
self.mode = mode
self.is_maintenance = is_maintenance
self._thread = None
def sync(self, delay_seconds=10):
time.sleep(delay_seconds)
self._thread = threading.Thread(target=self.do_sync)
self._thread.start()
@classmethod
def _get_parent_class_attribute(cls, cls_attr):
parent_attibutes = set()
for parent in cls.__mro__:
parent_attibutes |= set(getattr(parent, cls_attr, set()))
return list(parent_attibutes | set(getattr(cls, cls_attr, [])))
@classmethod
def get_required_mechanism_drivers(cls):
return cls._get_parent_class_attribute('_required_mechanism_drivers')
@classmethod
def get_required_service_plugins(cls):
return cls._get_parent_class_attribute('_required_service_plugins')
@classmethod
def get_required_ml2_extension_drivers(cls):
return cls._get_parent_class_attribute('_required_ml2_ext_drivers')
@abc.abstractmethod
def do_sync(self):
"""Method to sync the OVN DB."""
def stop(self):
# TODO(ralonsoh): this method and the function executed in the thread
# should support a fast exit way.
try:
self._thread.join()
except AttributeError:
# Haven't started syncing
pass
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