将Spring Cloud Sleuth与Spring Boot Amqp集成

Question

Looking for an example that shows integrating spring cloud sleuth with spring boot amqp (rabbit) publisher and subscriber.

I do see the following messages in the log

2016-10-21 08:35:15.708 INFO [producer,9148f56490e5742f,943ed050691842ab,false] 30928 --- [nio-8080-exec-1] abccontrollers.MessagingController : Received Request to pulish with Activity OrderShipped 2016-10-21 08:35:15.730 INFO [producer,9148f56490e5742f,943ed050691842ab,false] 30928 --- [nio-8080-exec-1] abcservice.ProducerService : Message published

When I look at messages on Queue, I don't see traceId or any other details added to the header. Should I use MessagePostProcessor to add these to the header?

Also what should be done on the receiving service?

Answer 1

Using Spring AMQP you can set MessagePostProcessor on the RabbitTemplate using the setBeforePublishPostProcessors method.

We implemented the org.springframework.amqp.core.MessagePostProcessor and Overrided the postProcessMessage method this way:

@Override
public org.springframework.amqp.core.Message postProcessMessage(org.springframework.amqp.core.Message message)
        throws AmqpException {
    MessagingMessageConverter converter = new MessagingMessageConverter();
    MessageBuilder<?> mb = MessageBuilder.fromMessage((Message<?>) converter.fromMessage(message));
    inject(tracer.getCurrentSpan(), mb);
    return converter.toMessage(mb.build(), message.getMessageProperties());
}

The inject method can now set all the required headers on the message, and it will be passed to the rabbitMq with the changes.
You have a great example of how to implement such inject method in org.springframework.cloud.sleuth.instrument.messaging.MessagingSpanInjector

We are using v1.1.1 of spring-cloud-sleuth-stream so my example is based on this version, in next release(1.2) it will be easier.

Answer 2

We don't instrument Spring AMQP out of the box. You can however use Spring Integration or Spring Cloud Stream that we do support and then everything will work out of the box. If you need to use Spring AMQP for some reason you'll have to instrument the code yourself (and sends us a PR ;) ).