module Datadog::Tracing::Contrib::ActionPack::ActionController::Instrumentation::Metal

def process_action(*args)
  # mutable payload with a tracing context that is used in two different
  # signals; it propagates the request span so that it can be finished
  # no matter what
  payload = {
    controller: self.class,
    action: action_name,
    env: request.env,
    headers: {
      # The exception this controller was given in the request,
      # which is typical if the controller is configured to handle exceptions.
      request_exception: request.headers['action_dispatch.exception']
    },
    tracing_context: {}
  }
  begin
    # process and catch request exceptions
    Instrumentation.start_processing(payload)
    result = super(*args)
    status = datadog_response_status
    payload[:status] = status unless status.nil?
    result
  # rubocop:disable Lint/RescueException
  rescue Exception => e
    payload[:exception] = [e.class.name, e.message]
    payload[:exception_object] = e
    raise e
  end
# rubocop:enable Lint/RescueException
ensure
  Instrumentation.finish_processing(payload)
end