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package metrics
import (
"time"
"golang.org/x/net/context"
"github.com/miekg/coredns/middleware"
"github.com/miekg/dns"
)
func (m Metrics) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := middleware.State{W: w, Req: r}
qname := state.Name()
qtype := state.Type()
zone := middleware.Zones(m.ZoneNames).Matches(qname)
if zone == "" {
zone = "."
}
// Record response to get status code and size of the reply.
rw := middleware.NewResponseRecorder(w)
status, err := m.Next.ServeDNS(ctx, rw, r)
Report(zone, qtype, rw.Rcode(), rw.Size(), rw.Start())
return status, err
}
// Report is a plain reporting function that the server can use for REFUSED and other
// queries that are turned down because they don't match any middleware.
func Report(zone, qtype, rcode string, size int, start time.Time) {
if requestCount == nil {
// no metrics are enabled
return
}
requestCount.WithLabelValues(zone, qtype).Inc()
requestDuration.WithLabelValues(zone, qtype).Observe(float64(time.Since(start) / time.Second))
responseSize.WithLabelValues(zone, qtype).Observe(float64(size))
responseRcode.WithLabelValues(zone, rcode, qtype).Inc()
}
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