func (l Logger) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) { state := middleware.State{W: w, Req: r} for _, rule := range l.Rules { if middleware.Name(rule.NameScope).Matches(state.Name()) { responseRecorder := middleware.NewResponseRecorder(w) rcode, err := l.Next.ServeDNS(ctx, responseRecorder, r) if rcode > 0 { // There was an error up the chain, but no response has been written yet. // The error must be handled here so the log entry will record the response size. if l.ErrorFunc != nil { l.ErrorFunc(responseRecorder, r, rcode) } else { rc := middleware.RcodeToString(rcode) answer := new(dns.Msg) answer.SetRcode(r, rcode) state.SizeAndDo(answer) metrics.Report(state, metrics.Dropped, rc, answer.Len(), time.Now()) w.WriteMsg(answer) } rcode = 0 } rep := middleware.NewReplacer(r, responseRecorder, CommonLogEmptyValue) rule.Log.Println(rep.Replace(rule.Format)) return rcode, err } } return l.Next.ServeDNS(ctx, w, r) }
func newReplacer(r *dns.Msg) middleware.Replacer { return middleware.NewReplacer(r, nil, "") }