Support error handlers

[confact]

To be able to send exceptions and errors to Sentry, rollbar, bugsnag, errordeck, and so on.

It would help to figure out easier what is going on in the jobs.

[robacarp]

@confact thanks, this has been in my mind, but I didn't have an issue for it yet.

[robacarp]

@confact I think this is already possible with the current RC, which includes before/after hooks. Here's a minimal example:

class ErrorHandlerJob < Mosquito::QueuedJob
  def perform
    raise "Error!"
  end

  after do
    return unless failed?
    Log.error(exception: exception) { "Job failed after hook" }
    # Honeybadger.dispatch exception
  end
end

This pattern could be monkey-patched into Mosquito::Job to be applied application wide, or packed up as a module to be selectively included in jobs which need it.

Notably this would miss exceptions which are thrown in an after-hook. That would actually crash the runner itself, and it would require an additional catch written around the runner initiation. Let me know if that doesn't cast a wide enough net. I'm going to mark this as done, and go write a page for the website about it.

[robacarp]

https://mosquito-cr.github.io/manual/error_reporting.html via https://github.com/mosquito-cr/mosquito-cr.github.io/commit/f6dc433efb9c950cfb966b143a27edba12e61328