服务器端：rpc_server.py

import pika,time

connection = 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,uuid

import time

class 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)