服务器端：rpc_server.py

 

import pika,timeconnection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))channel = connection.channel()channel.queue_declare(queue='rpc_queue')def fib(n):    if n == 0:        return 0    elif n == 1:        return 1    else:        return fib(n-1) + fib(n -2)def on_request(ch, method, props, body):    n = int(body)    print("[.] fib(%s)" % n)    response = fib(n)#斐波那契的执行结果赋值给reponse    #再把得到的消息发回给客户端    ch.basic_publish(exchange='',                     routing_key=props.reply_to,                     properties = pika.BasicProperties(                         correlation_id= \                            props.correlation_id                     ),                     body =str(response))    ch.basic_ack(delivery_tag=method.delivery_tag)#确保消息被消费，代表任务完成#channel.basic_qos(prefetch_count=1)channel.basic_consume(on_request,                      queue='rpc_queue')print(" [x] Awaiting RPC request")channel.start_consuming()

 

客户端：rpc_client.py

import pika,sys,uuidimport timeclass FibonacciRpcClient(object):    def __init__(self):        self.connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))        self.channel = self.connection.channel()        result = self.channel.queue_declare(exclusive=True)        self.callback_queue = result.method.queue#获取queue名字        self.channel.basic_consume(self.on_response,#只要收到就调用on_response()                                   no_ack=True,                                   queue=self.callback_queue                                   )    def on_response(self, ch, method, props, body):        if self.corr_id == props.correlation_id:#判断服务器端corr_id和本地corr_id相等，才往下走            self.response = body#response收到body的消息表示response不为空    def call(self, n):        self.response = None        self.corr_id = str(uuid.uuid4())        self.channel.basic_publish(exchange='',                                   routing_key='rpc_queue',                                   properties=pika.BasicProperties(                                       reply_to=self.callback_queue,#指定返回到那个queue                                       correlation_id=self.corr_id,                                   ),                                   body=str(n))#传字符串，把30传进来        while self.response is None:            #收到消息，就会触发on_response()，没消息就继续往下走循环            self.connection.process_data_events()#非阻塞版的start_consuming            print("no msg...")#只要走到这，就相当于没消息            time.sleep(0.5)        return int(self.response)fibonacci_rpc = FibonacciRpcClient()print(" [x] Requesting fib(30)")response = fibonacci_rpc.call(8)print(" [.] Got %r" % response)