Is it possible to tap queue on default exchange? about rabtap HOT 8 CLOSED

@andrewmweaver89 we encountered the same problem, here's what you can do without changing your queue bindings...

1. Turn on the firehose tracer

rabbitmqctl trace_on

2. Tap the trace exchange

raptap amq.rabbitmq.trace:#

from rabtap.

Hi, when tapping messages, rabtap is creating a temporary exchange-to-exchange binding on the exchange being tapped. It seems that RabbitMQ does not generally allow to bind to the default exchange, as this code excerpt from RabbitMQ suggests (if I intepret it correcty):

https://github.com/rabbitmq/rabbitmq-server/blob/79da341df49a8fc54229b930bd0e8d52f4209f64/src/rabbit_channel.erl#L1950-L1960

To solve your problem, you could bind your queue e.g. to the amq.direct exchange and then tap this exchange with the queues name as the binding key.

from rabtap.

Ok. First thanks for the response 👍

Ccurrently all my queues are just using the default exchange(""). If I understand you correctly, I would need to bind my queue to amq.direct and then have all my messages directed to that exchange via my application?

from rabtap.

Yes, there are many options depending on your requirements. RabbitMQ supports different exchange types (e.g. direct, fanout, topic, header), which define how messages are routed. When using the pre-defined amq.direct exchange (type direct), you bind your queue to this exchange using a provided binding key, e.g. MYKEY. Published messages to exchange amq.direct are routed to all queues where the provided routing key equals the binding key (e.g. MYKEY).

Have a look at the basic concepts documentation of RabbitMQ and the official tutorials for further information.

from rabtap.

Awesome. Thanks for the prompt, detailed reply!

from rabtap.

Thanks for the info, I'll put it in the FAQ.

from rabtap.

Thanks @AnthonyMastrean I think you saved me a lot of time. Putting it in the FAQ will help a lot of people. I can push a PR. But where is the FAQ? Maybe the 1st https://github.com/jandelgado/rabtap#examples ?

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Hi, I documented the example in #44 , will merge after a review. BR jan

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