Python Proton将二进制数据发送到Active MQ

Question

I am trying to write a simple string message to an ActiveMQ queue:

def write_to_amq(message, host_name, port, queue):
    conn = BlockingConnection(f'{host_name}:{port}')
    sender = conn.create_sender(queue)
    sender.send(Message(body='message'))
    conn.close()

The message gets to the queue just fine, but it appears to have some binary data in it when I view it on the ActiveMQ web UI. It reports the contents as SpESsESw�message. I was expecting the contents to just be message

[Additional data point]

I am also seeing this in a separate Go program I have written using the pack.ag/amqp package.

func (s *amqpSender) SendResult(data string) error {
    session, err := s.client.NewSession()
    if err != nil {
        return fmt.Errorf("failure creating AMQP session: %s", err)
    }

    ctx := context.Background()
    sender, err := session.NewSender(
        amqp.LinkTargetAddress(s.workQueueName),
    )
    if err != nil {
        return fmt.Errorf("failure creating sender link: %s", err)
    }

    ctx, cancel := context.WithTimeout(ctx, s.timeout)
    defer func() {
        cancel()
        sender.Close(ctx)
    }()

    err = sender.Send(ctx, amqp.NewMessage([]byte(data)))
    if err != nil {
        return fmt.Errorf("failure sending message: %s", err)
    }

    return nil
}

When I send a different message to ActiveMQ, I get similar behavior, seeing Su�vMy message in the ActiveMQ Message Details. Could this just be a web UI anomaly?

Answer 1

You need to tell the python binding that you want to encode the body as a String value by adding the unicode encoding prefix to you string so that the python binding knows what to do with the data you are encoding. The way you are currently handing off the body is resulting in a binary encoding instead and so the broker will show you the garbage data on the console as it views this as a BytesMessage instead of a TextMessage

It should work if you did something like the following:

sender.send(Message(body=u"message"))

More on python string encoding and decoding here.