type Processor interface {
	Process(buf []byte) (message string, err error)
}

type ErrorHandler interface {
	Handle(err error)
}

func RegularError(buf []byte, processor Processor,
	handler ErrorHandler) (message string, err error) {
	message, err = processor.Process(buf)
	if err != nil {
		handler.Handle(err)
		return "", err
	}
	return
}