notify bugsnag when delayed job errors occur

delayedjob-bugsnag.rb

# some references which helped
# http://blog.salsify.com/engineering/delayed-jobs-callbacks-and-hooks-in-rails
# http://stackoverflow.com/a/16639849/109175
# example plugin: https://github.com/collectiveidea/delayed_job/blob/master/lib/delayed/plugins/clear_locks.rb
module Delayed
  module Plugins
    class Bugsnag < Plugin
      callbacks do |lifecycle|
        lifecycle.around(:invoke_job) do |job, &block|
          begin
            block.call(job)
          rescue Exception => error
            ::Bugsnag.auto_notify(error)
            raise
          end
        end
      end
    end
  end
end
Delayed::Worker.plugins << Delayed::Plugins::Bugsnag