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Add middleware.NextOrFailure (#462)

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This checks if the next middleware to be called is nil, and if so returns
ServerFailure and an error. This makes the next calling more robust and
saves some lines of code.

Also prefix the error with the name of the middleware to aid in
debugging.
This commit is contained in:
Miek Gieben
2016-12-20 18:58:05 +00:00
committed by GitHub
parent 451a0bd529
commit c4ab98c6e3
23 changed files with 51 additions and 67 deletions
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12
middleware/log/log.go
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@@ -32,14 +32,14 @@ func (l Logger) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
continue
}
responseRecorder := dnsrecorder.New(w)
rc, err := l.Next.ServeDNS(ctx, responseRecorder, r)
rrw := dnsrecorder.New(w)
rc, err := middleware.NextOrFailure(l.Name(), l.Next, ctx, rrw, r)
if rc > 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, rc)
l.ErrorFunc(rrw, r, rc)
} else {
answer := new(dns.Msg)
answer.SetRcode(r, rc)
@@ -52,16 +52,16 @@ func (l Logger) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
rc = 0
}
class, _ := response.Classify(responseRecorder.Msg)
class, _ := response.Classify(rrw.Msg)
if rule.Class == response.All || rule.Class == class {
rep := replacer.New(r, responseRecorder, CommonLogEmptyValue)
rep := replacer.New(r, rrw, CommonLogEmptyValue)
rule.Log.Println(rep.Replace(rule.Format))
}
return rc, err
}
return l.Next.ServeDNS(ctx, w, r)
return middleware.NextOrFailure(l.Name(), l.Next, ctx, w, r)
}
// Name implements the Handler interface.