rabbitMQ topic实现广播

消息发送者：

'''
exchange 类型：
fanout：所有bind到此exchange 的queue 都可以接收到消息

direct： 通过routingkey和exchange 决定的那个唯一的queue 可以接收到消息

topic: 所有符合routingkey的routingkey所bind的queue 可以接收消息

表达式符合说明：
    #代表一个或多个字符
    *代表任何字符
　　想收所有可以用 #


header：通过headers来决定把消息发给哪些queue

'''


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

channel.exchange_declare(exchange='topic_logs',exchange_type='topic')

routingKey = 'test.info'
msg = 'send topic ~~'

channel.basic_publish(exchange='topic_logs',routing_key=routingKey,body=msg)

print("send :",msg)
print("routingKey :",routingKey)

channel.close()

消息接收者：

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

channel.exchange_declare(exchange='topic_logs',exchange_type='topic')


result = channel.queue_declare(exclusive=True)
queueName =  result.method.queue
bindKey = '*.info'
channel.queue_bind(exchange='topic_logs',queue=queueName,routing_key=bindKey)


def callback(ch , method , properties , body):
    print("接收：",body)

channel.basic_consume(callback,
                queue=queueName,
                no_ack=True)

channel.start_consuming()
channel.close()