sezaru
Why before_process is called twice if I cancel a running job?
I have a hook that implements before_process/1 and use it to log and pub_sub.
I noticed that, if I have a job currently in executing state, if I call Oban.cancel_job for it, before_process/1 will be called again before after_process(:cancel, …) is called.
Why is that?
This creates some issues to my case since I’m using this hook to send pub_sub messages, meaning that I end up sending a “wrong” executing message event (I send it if before_process/1 is called).
Btw, this seems to only happen using before_process/1, using telemetry [:oban, :job, :start] work fine.
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sorentwo
This is by design and intentional. The cancel event is handled by a different process from the job. When the hook fires in a new process, there isn’t any stored/prepared job data, so before_process/1 is called again to reconstruct the job state before calling after_process/3 hooks.
This is done to ensure hooks have consistent job state, including any potential pre-processing that was done in before_process/1. The :start telemetry isn’t fired before cancellation, which is why it works the way you expect.
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