Python-RabbitMQ-RPC（非阻塞版）

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)