RabbitMq 消息队列 在Python端的应用

https://www.cnblogs.com/Xuuuuuu/p/10895552.html

rabbit_server持久化，消费者端手动确认保证消息不会丢失。具体代码如下：

1对1生产者端代码：

import pika

username = ''
password = ''
credentials = pika.PlainCredentials(username=username,password=password)
connection = pika.BlockingConnection(pika.ConnectionParameters(host='',virtual_host='',credentials=credentials))
# connection = pika.BlockingConnection(pika.ConnectionParameters('127.0.0.1'))
channel = connection.channel()
#声明队列，并设置durable为True，持久化防止rabbit-server挂掉数据丢失
channel.queue_declare(queue='lg_case_state',durable=True)
#exchange表示交换器，可以精确的制定消息应发到哪个队列，route_key设置队列的名称，body表示发送的内容
channel.basic_publish(exchange='', routing_key='lg_case_state', body=str(body),
                      properties=pika.BasicProperties(
                     delivery_mode=2, # 消息持久化
                  ))
#关闭连接
connection.close()

　　

1对1消费者端消费json代码：

import pika
import json
username = ''
password = ''
credentials = pika.PlainCredentials(username=username,password=password)
connection = pika.BlockingConnection(pika.ConnectionParameters(host='',virtual_host='',credentials=credentials))
# connection = pika.BlockingConnection(pika.ConnectionParameters('127.0.0.1'))
channel = connection.channel()
# 声明队列，如果消息发送到不存在的队列，rabbitmq会自动清除这些消息
channel.queue_declare(queue='lg_case_state',durable=True)
# 发送邮件执行函数
def callback(ch, method, properties, body):
    json_body = json.loads(body.decode().replace('\'', '"'))       # bytes=> string=>json
    print(" [x] Received %r" % (json_body,))
    ch.basic_ack(delivery_tag=method.delivery_tag)     # 消费者手动应答
# 取消公平分发模式，而是分发给下一个空闲的消费者
# channel.basic_qos(prefetch_count=1)
# 取消自动应答，采用手动应答防止邮件发送过程中出错数据丢失
channel.basic_consume(on_message_callback=callback, queue='lg_case_state', auto_ack=False)
print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()