OpenStack Networking (Neutron)
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# Copyright (c) 2015 Mellanox Technologies, Ltd
# All Rights Reserved.
#
# 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 oslo_config import cfg
from oslo_log import log
import stevedore
from neutron._i18n import _, _LE, _LI
LOG = log.getLogger(__name__)
L2_AGENT_EXT_MANAGER_NAMESPACE = 'neutron.agent.l2.extensions'
L2_AGENT_EXT_MANAGER_OPTS = [
cfg.ListOpt('extensions',
default=[],
help=_('Extensions list to use')),
]
def register_opts(conf):
conf.register_opts(L2_AGENT_EXT_MANAGER_OPTS, 'agent')
class AgentExtensionsManager(stevedore.named.NamedExtensionManager):
"""Manage agent extensions."""
def __init__(self, conf):
super(AgentExtensionsManager, self).__init__(
L2_AGENT_EXT_MANAGER_NAMESPACE, conf.agent.extensions,
invoke_on_load=True, name_order=True)
LOG.info(_LI("Loaded agent extensions: %s"), self.names())
def initialize(self, connection, driver_type, agent_api=None):
"""Initialize enabled L2 agent extensions.
:param connection: RPC connection that can be reused by extensions to
define their RPC endpoints
:param driver_type: a string that defines the agent type to the
extension. Can be used by the extension to choose
the right backend implementation.
:param agent_api: an AgentAPI instance that provides an API to
interact with the agent that the manager
is running in.
"""
# Initialize each agent extension in the list.
for extension in self:
LOG.info(_LI("Initializing agent extension '%s'"), extension.name)
extension.obj.consume_api(agent_api)
extension.obj.initialize(connection, driver_type)
def handle_port(self, context, data):
"""Notify all agent extensions to handle port."""
for extension in self:
try:
extension.obj.handle_port(context, data)
# TODO(QoS) add agent extensions exception and catch them here
except AttributeError:
LOG.exception(
_LE("Agent Extension '%(name)s' failed "
"while handling port update"),
{'name': extension.name}
)
def delete_port(self, context, data):
"""Notify all agent extensions to delete port."""
for extension in self:
try:
extension.obj.delete_port(context, data)
# TODO(QoS) add agent extensions exception and catch them here
# instead of AttributeError
except AttributeError:
LOG.exception(
_LE("Agent Extension '%(name)s' failed "
"while handling port deletion"),
{'name': extension.name}
)