RabbitMQ - 3 fanout模式

Putting it all together

send.py

#!/usr/bin/env python
import pika
import sys

connection = pika.BlockingConnection(
    pika.ConnectionParameters(host='localhost'))
channel = connection.channel()

channel.exchange_declare(exchange='logs', exchange_type='fanout')  # 幂等

message = ' '.join(sys.argv[1:]) or "info: Hello World!"
channel.basic_publish(exchange='logs', routing_key='', body=message)
print(" [x] Sent %r" % message)
connection.close()

receive.py

#!/usr/bin/env python
import pika

connection = pika.BlockingConnection(
    pika.ConnectionParameters(host='localhost'))
channel = connection.channel()

channel.exchange_declare(exchange='logs', exchange_type='fanout')

result = channel.queue_declare(queue='', exclusive=True)  # 临时队列
queue_name = result.method.queue

channel.queue_bind(exchange='logs', queue=queue_name)

print(' [*] Waiting for logs. To exit press CTRL+C')

def callback(ch, method, properties, body):
    print(" [x] %r" % body)

channel.basic_consume(
    queue=queue_name, on_message_callback=callback, auto_ack=True)

channel.start_consuming()

　　

 队列绑定图：

可能有的同学会问：为什么没有指定routing_key呢？ -- 由于fanout这种模式的特点，它类似于广播的模式，即使写了也会被忽略掉。

临时队列

使用场景：1. 在连接到RabbitMQ时需要一个全新的空的队列  2. 在consumer连接关闭时队列也被删除时

1. result = channel.queue_declare(queue='')

2. result = channel.queue_declare(queue='', exclusive=True)