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when no response is written, fallback to status of next plugin in prometheus plugin (#4727)

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* when no response is written, fallback to status of next plugin in prometheus plugin

Signed-off-by: Ondrej Benkovsky <ondrej.benkovsky@wandera.com>

* fixup! when no response is written, fallback to status of next plugin in prometheus plugin

Signed-off-by: Ondrej Benkovsky <ondrej.benkovsky@wandera.com>
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Ondřej Benkovský 2021-07-09 16:35:38 +02:00 • committed by GitHub
parent 70b51a73d3
commit 2a61309cad
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1 changed files with 8 additions and 1 deletions
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9
plugin/metrics/handler.go
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@ -26,7 +26,14 @@ func (m *Metrics) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg
rw := dnstest.NewRecorder(w)
status, err := plugin.NextOrFailure(m.Name(), m.Next, ctx, rw, r)
vars.Report(WithServer(ctx), state, zone, rcode.ToString(rw.Rcode), rw.Len, rw.Start)
rc := rw.Rcode
if !plugin.ClientWrite(status) {
// when no response was written, fallback to status returned from next plugin as this status
// is actually used as rcode of DNS response
// see https://github.com/coredns/coredns/blob/master/core/dnsserver/server.go#L318
rc = status
}
vars.Report(WithServer(ctx), state, zone, rcode.ToString(rc), rw.Len, rw.Start)
return status, err
}