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package metrics
import (
"context"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/metrics/vars"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/pkg/rcode"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
// ServeDNS implements the Handler interface.
func (m *Metrics) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := request.Request{W: w, Req: r}
qname := state.QName()
zone := plugin.Zones(m.ZoneNames()).Matches(qname)
if zone == "" {
zone = "."
}
// Record response to get status code and size of the reply.
rw := dnstest.NewRecorder(w)
status, err := plugin.NextOrFailure(m.Name(), m.Next, ctx, rw, r)
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
}
// Name implements the Handler interface.
func (m *Metrics) Name() string { return "prometheus" }
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