RabbitMQ使用介绍6—RPC

RPC

RPC既做消费者也做生产者

reply_to=self.callback_queue, #接收的队列
correlation_id=self.corr_id,#发送和接收到的问题的消息

rpc_client.py

# -*- coding: utf-8 -*-
'''
@Time    : 2019/11/2 16:14
@Author  : jiangzhiqin 
'''
import pika
import uuid
class FibonacciRpcClient(object):

    def __init__(self):
        self.connection = pika.BlockingConnection(
            pika.ConnectionParameters(host='localhost'))
        self.channel = self.connection.channel()
        result = self.channel.queue_declare(queue='',exclusive=True)
        self.callback_queue = result.method.queue

        self.channel.basic_consume(
            queue=self.callback_queue,
            on_message_callback=self.on_response,
            auto_ack=True)

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

    def call(self,n):
        self.response = None
        self.corr_id = str(uuid.uuid4())
        self.channel.basic_publish(
            exchange='',
            routing_key='rpc_queque',
            properties=pika.BasicProperties(
                reply_to=self.callback_queue,
                correlation_id=self.corr_id,
            ),
            body=str(n))
        while self.response is None:
            self.connection.process_data_events() #以非阻塞的方式去检查有没有新消息，有的话就接收

        return int(self.response)

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

rpc_server.py

# -*- coding: utf-8 -*-
'''
@Time    : 2019/11/2 16:14
@Author  : jiangzhiqin 
'''
import pika
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)
    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(queue='rpc_queue',on_message_callback=on_request)
print("[x] Awaiting RPC requests")
channel.start_consuming()