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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 oslo_log import log
import stevedore
from neutron.conf.agent import agent_extensions_manager as agent_ext_mgr_config
LOG = log.getLogger(__name__)
agent_ext_mgr_config.register_agent_ext_manager_opts()
class AgentExtensionsManager(stevedore.named.NamedExtensionManager):
"""Manage agent extensions."""
def __init__(self, conf, namespace):
super(AgentExtensionsManager, self).__init__(
namespace, conf.agent.extensions,
invoke_on_load=True, name_order=True)
LOG.info("Loaded agent extensions: %s", self.names())
def initialize(self, connection, driver_type, agent_api=None):
"""Initialize enabled 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("Initializing agent extension '%s'", extension.name)
# If the agent has provided an agent_api object, this object will
# be passed to all interested extensions. This object must be
# consumed by each such extension before the extension's
# initialize() method is called, as the initialization step
# relies on the agent_api already being available.
extension.obj.consume_api(agent_api)
extension.obj.initialize(connection, driver_type)
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