• direct直连交换机实现订阅消息的子集


    参考链接 

    英文:  https://www.rabbitmq.com/tutorials/tutorial-four-python.html

    中文: https://rabbitmq.mr-ping.com/tutorials_with_python/[4]Routing.html

    提交日志 sendlog.py

    #!/usr/bin/env python
    # -*- coding: UTF-8 -*-
    import pika
    import sys
    
    connection = pika.BlockingConnection(
        pika.ConnectionParameters(host='localhost'))
    channel = connection.channel()
    
    channel.exchange_declare(exchange='direct_logs', exchange_type='direct')
    
    severity = sys.argv[1] if len(sys.argv) > 1 else 'info'
    message = ' '.join(sys.argv[2:]) or 'Hello World!'
    channel.basic_publish(
        exchange='direct_logs', routing_key=severity, body=message)
    print(" [x] Sent %r:%r" % (severity, message))
    connection.close()

    订阅日志

    #!/usr/bin/env python
    import pika
    import sys
    
    connection = pika.BlockingConnection(
        pika.ConnectionParameters(host='localhost'))
    channel = connection.channel()
    
    channel.exchange_declare(exchange='direct_logs', exchange_type='direct')
    
    result = channel.queue_declare(queue='', exclusive=True)
    queue_name = result.method.queue
    
    severities = sys.argv[1:]
    if not severities:
        sys.stderr.write("Usage: %s [info] [warning] [error]
    " % sys.argv[0])
        sys.exit(1)
    
    for severity in severities:
        channel.queue_bind(
            exchange='direct_logs', queue=queue_name, routing_key=severity)
    
    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(
        queue=queue_name, on_message_callback=callback, auto_ack=True)
    
    channel.start_consuming()

    发布日志

    python sendlog.py error  "helllo223"

    python sendlog.py info "hellloinfowarn"

    python sendlog.py  warn "hellloinfowarn"

    订阅日志

    worker1  python sub.py  info  warn

    worker2   python sub.py error warn

    备注: 两个worker 的队列都绑定了 warn 绑定键   多个队列使用相同的绑定键是合法的

    It is perfectly legal to bind multiple queues with the same binding key

    效果:  发布的 info 信息 只有 worker1 能收到  

                  发布的 error信息只有worker2 能收到

                发布的 warn信息 worker1 worker2 都能收到

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  • 原文地址:https://www.cnblogs.com/jkklearn/p/13787169.html
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