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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
from neutron_lib.agent import extension
class L2AgentExtension(extension.AgentExtension, metaclass=abc.ABCMeta):
"""Define stable abstract interface for l2 agent extensions.
An agent extension extends the agent core functionality.
"""
def initialize(self, connection, driver_type):
"""Initialize agent extension.
:param connection: RPC connection that can be reused by the extension
to define its RPC endpoints
:param driver_type: String that defines the agent type to the
extension. Can be used to choose the right backend
implementation.
"""
@abc.abstractmethod
def handle_port(self, context, data):
"""Handle a port add/update event.
This can be called on either create or update, depending on the
code flow. Thus, it's this function's responsibility to check what
actually changed.
:param context: RPC context.
:param data: Port data.
"""
@abc.abstractmethod
def delete_port(self, context, data):
"""Handle a port delete event.
:param context: RPC context.
:param data: Port data.
"""
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