geofflane
Broadway catches exceptions and handles other errors by logging the error and “failing” the message. Is there a way to get a callback called to do something with that error as well? I would need the original message and the error (message, exception, etc).
My use case:
We’re collecting a bunch of data from a bunch of people over time. As the data gets collected it gets put on a queue and consumed by another app to coalesce that data into a bunch of “facts” (for lack of a better term) that we can query and report on. Any errors get sent back to the collection application by publishing a message to another queue with the original payload and the error reason. The sending application listens for these messages and collects them into a report for “quality control” to rectify.
Rabbit dead-letters don’t work because a nack doesn’t allow you change the message as far as I know. So we need to actually push another message. We built all of this ourselves before Broadway, but not quite as sophisticated as Broadway (e.g. termination process). I was looking to convert to Broadway and couldn’t see a way to do that. Any pointers?
Thanks.
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dnsbty
In case anyone else stumbles across this in the future, since Broadway 0.5.0, the
handle_failed/2callback has been added to handle this: Broadway — Broadway v1.3.0geofflane
I’d love to see that kind of callback added. As you mention catching and rethrowing seems possible, just not an ideal solution. Thanks for the response!
msaraiva
Hi @geofflane!
We’ve been discussing the possibility of adding a callback (or something similar) for that purpose. For now, one thing you could try would be wrapping the code that might fail inside
handle_message/3orhandle_batch/4in atry/catchblock, do your stuff and then re-raise the exception (or set the message as failed usingMessage.failed/2).Not optimal, I confess. But it might do the trick until we have a built-in solution.
Cheers.
-marlus