rabbitmq消息RPC

RPC：Remote Producre Call

　　　　远程　  过程　  调用

str(uuid.uuid4())　　唯一标志符

队列谁先声明谁先启动

命令+&　　异步　　fg 查看正在执行的任务

fg+序列号　　查看对应的任务 [ 序列号 ]

import pika
import uuid


class FibonacciRpcClient(object):
    def __init__(self):


        credentials = pika.PlainCredentials('alex', 'alex123')
        self.connection = pika.BlockingConnection(pika.ConnectionParameters(
            '192.168.14.52', credentials=credentials))
        channel = self.connection.channel()
        self.channel = self.connection.channel()

        result = self.channel.queue_declare(exclusive=True)
        self.callback_queue = result.method.queue

        self.channel.basic_consume(self.on_response, no_ack=True,#准备接受命令结果
                                   queue=self.callback_queue)


    def on_response(self, ch, method, props, body):
        """"callback方法"""
        if self.corr_id == props.correlation_id:
            self.response = body

    def call(self, n):
        self.response = None
        self.corr_id = str(uuid.uuid4()) #唯一标识符
        self.channel.basic_publish(exchange='',
                                   routing_key='rpc_queue',
                                   properties=pika.BasicProperties(
                                       reply_to=self.callback_queue,
                                       correlation_id=self.corr_id,
                                   ),
                                   body=str(n))

        count  = 0
        while self.response is None:
            self.connection.process_data_events() #检查队列里有没有新消息,但不会阻塞
            count +=1
            print("check...",count)

        return int(self.response)


fibonacci_rpc = FibonacciRpcClient()

print(" [x] Requesting fib(30)")
response = fibonacci_rpc.call(5)
print(" [.] Got %r" % response)

rpc_client.py

import pika
import time

credentials = pika.PlainCredentials('alex', 'alex123')
connection = pika.BlockingConnection(pika.ConnectionParameters(
    '192.168.14.52',credentials=credentials))



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)

    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)


channel.basic_qos(prefetch_count=1)
channel.basic_consume(on_request, queue='rpc_queue')

print(" [x] Awaiting RPC requests")
channel.start_consuming()

rpc_server.py