120 lines
4.0 KiB
Python
120 lines
4.0 KiB
Python
# Copyright 2015 Huawei Technologies Co., Ltd.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from inspect import stack
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import neutron.common.rpc as neutron_rpc
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import neutron.common.topics as neutron_topics
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import neutron.context as neutron_context
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from oslo_config import cfg
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from oslo_log import log as logging
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import oslo_messaging
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from tricircle.common.serializer import CascadeSerializer as Serializer
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TRANSPORT = oslo_messaging.get_transport(cfg.CONF)
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LOG = logging.getLogger(__name__)
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class NetworkingRpcApi(object):
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def __init__(self):
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if not neutron_rpc.TRANSPORT:
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neutron_rpc.init(cfg.CONF)
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target = oslo_messaging.Target(topic=neutron_topics.PLUGIN,
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version='1.0')
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self.client = neutron_rpc.get_client(target)
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# adapt tricircle context to neutron context
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def _make_neutron_context(self, context):
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return neutron_context.ContextBase(context.user, context.tenant,
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auth_token=context.auth_token,
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is_admin=context.is_admin,
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request_id=context.request_id,
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user_name=context.user_name,
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tenant_name=context.tenant_name)
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def update_port_up(self, context, port_id):
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call_context = self.client.prepare()
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return call_context.call(self._make_neutron_context(context),
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'update_port_up', port_id=port_id)
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def update_port_down(self, context, port_id):
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call_context = self.client.prepare()
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return call_context.call(self._make_neutron_context(context),
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'update_port_down', port_id=port_id)
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def create_client(target):
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return oslo_messaging.RPCClient(
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TRANSPORT,
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target,
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serializer=Serializer(),
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)
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class AutomaticRpcWrapper(object):
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def __init__(self, send_message_callback):
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self._send_message = send_message_callback
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def _send_message(self, context, method, payload, cast=False):
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"""Cast the payload to the running cascading service instances."""
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cctx = self._client.prepare(
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fanout=cast,
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)
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LOG.debug(
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'%(what)s at %(topic)s.%(namespace)s the message %(method)s',
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{
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'topic': cctx.target.topic,
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'namespace': cctx.target.namespace,
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'method': method,
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'what': {True: 'Fanout notify', False: 'Method call'}[cast],
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}
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)
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if cast:
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cctx.cast(context, method, payload=payload)
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else:
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return cctx.call(context, method, payload=payload)
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def send(self, cast):
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"""Autowrap an API call with a send_message() call
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This function uses python tricks to implement a passthrough call from
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the calling API to the cascade service
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"""
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caller = stack()[1]
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frame = caller[0]
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method_name = caller[3]
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context = frame.f_locals.get('context', {})
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payload = {}
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for varname in frame.f_code.co_varnames:
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if varname in ("self", "context"):
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continue
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try:
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payload[varname] = frame.f_locals[varname]
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except KeyError:
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pass
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LOG.info(
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"Farwarding request to %s(%s)",
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method_name,
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payload,
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)
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return self._send_message(context, method_name, payload, cast)
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