使用oslo相关模块构造rpc server及client代码样例

前提条件：rabbitmq服务启动、oslo相关模块已安装、 /etc/test/test.conf文件存在且配置了rabbitmq相关的配置项

主要配置项如下：

rabbit_host=127.0.0.1

rabbit_userid=test

rabbit_password=123456

rpc server端代码如下：

import oslo_messaging as messaging

from oslo_config import cfg

from oslo_service import service

CONF = cfg.CONF

TRANSPORT = None

CONF(None, project='test')

TRANSPORT = messaging.get_transport(CONF)
class WorkerManager(object):    target = messaging.Target(version='1.0')    def __init__(self, host=None):        self.host = host
    def test_get(self, context, get_id):
        print "test_get method is called"
class Service(service.Service):
 def __init__(self, host, binary, topic, manager=None, *args, **kwargs):
        super(Service, self).__init__()
        self.host = host
        self.binary = binary
        self.topic = topic
        self.manager = WorkerManager(host=self.host)
        self.rpcserver = None
    def start(self):
        target = messaging.Target(topic=self.topic, server=self.host)
        endpoints = [self.manager]
        self.rpcserver = messaging.get_rpc_server(TRANSPORT, target, endpoints)        self.rpcserver.start()    def __getattr__(self, key):        manager = self.__dict__.get('manager', None)        return getattr(manager, key)    def kill(self):        self.stop()    def stop(self, graceful=False):        try:            self.rpcserver.stop()            self.rpcserver.wait()        except Exception:            pass        super(Service, self).stop()    def reset(self):        """Reset a service in case it received a SIGHUP."""        pass
server=Service(host='testHostname', binary='test-bin', topic='test')
_launcher = service.launch(CONF, server, workers=1)
_launcher.wait()
rpc client端代码如下：
import oslo_messaging as messaging
from oslo_config import cfg


CONF = cfg.CONF
CONF(None, project='test')
TRANSPORT = None
TRANSPORT = messaging.get_transport(CONF)


class RpcApi(object):
    def __init__(self):
        target = messaging.Target(topic='test', version='1.0')
        self.client = messaging.RPCClient(TRANSPORT, target)


    def test_get(self, ctxt, get_id):
        version = '1.0'
        cctxt = self.client.prepare(version=version)
        return cctxt.cast(ctxt, 'test_get', get_id=get_id)


rpc_api=RpcApi()
rpc_api.test_get({},'aaaa')