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  • RabbitMQ--Publish/Subscribe(五)

    上篇文章中,我们实现了不同consumer接收不同级别的日志,这篇文章中,不以日志级别,使用不同日志来源。比如kernel.*、*.critical。

    这就要使用topic exchange完成了。将message发送给topic exchange不能包含任意的routing_key了,必须是以'.'分割的多个words。words可以是任何字符。

    用到正则如下:

    • * 代替一个word
    • # 代替0个或1个words

    sender_topic.py

    #!/usr/bin/env python
    import pika
    import sys
    
    connection = pika.BlockingConnection(pika.ConnectionParameters(
            host='localhost'))
    channel = connection.channel()
    
    channel.exchange_declare(exchange='topic_logs',
                             type='topic')
    
    routing_key = sys.argv[1] if len(sys.argv) > 2 else 'anonymous.info'
    message = ' '.join(sys.argv[2:]) or 'Hello World!'
    channel.basic_publish(exchange='topic_logs',
                          routing_key=routing_key,
                          body=message)
    print(" [x] Sent %r:%r" % (routing_key, message))
    connection.close()

    recv_topic.py

    #!/usr/bin/env python
    import pika
    import sys
    
    connection = pika.BlockingConnection(pika.ConnectionParameters(
            host='localhost'))
    channel = connection.channel()
    
    channel.exchange_declare(exchange='topic_logs',
                             type='topic')
    
    result = channel.queue_declare(exclusive=True)
    queue_name = result.method.queue
    
    binding_keys = sys.argv[1:]
    if not binding_keys:
        sys.stderr.write("Usage: %s [binding_key]...
    " % sys.argv[0])
        sys.exit(1)
    
    for binding_key in binding_keys:
        channel.queue_bind(exchange='topic_logs',
                           queue=queue_name,
                           routing_key=binding_key)
    
    print(' [*] Waiting for logs. To exit press CTRL+C')
    
    def callback(ch, method, properties, body):
        print(" [x] %r:%r" % (method.routing_key, body))
    
    channel.basic_consume(callback,
                          queue=queue_name,
                          no_ack=True)
    
    channel.start_consuming()
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  • 原文地址:https://www.cnblogs.com/xiaoming279/p/6281878.html
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