52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
package tunneldns
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import (
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"context"
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"sync"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/metrics/vars"
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"github.com/coredns/coredns/plugin/pkg/dnstest"
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"github.com/coredns/coredns/plugin/pkg/rcode"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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"github.com/prometheus/client_golang/prometheus"
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)
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var once sync.Once
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// MetricsPlugin is an adapter for CoreDNS and built-in metrics
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type MetricsPlugin struct {
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Next plugin.Handler
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}
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// NewMetricsPlugin creates a plugin with configured metrics
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func NewMetricsPlugin(next plugin.Handler) *MetricsPlugin {
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once.Do(func() {
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prometheus.MustRegister(vars.RequestCount)
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prometheus.MustRegister(vars.RequestDuration)
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prometheus.MustRegister(vars.RequestSize)
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prometheus.MustRegister(vars.RequestDo)
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prometheus.MustRegister(vars.RequestType)
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prometheus.MustRegister(vars.ResponseSize)
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prometheus.MustRegister(vars.ResponseRcode)
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})
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return &MetricsPlugin{Next: next}
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}
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// ServeDNS implements the CoreDNS plugin interface
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func (p MetricsPlugin) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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state := request.Request{W: w, Req: r}
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rw := dnstest.NewRecorder(w)
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status, err := plugin.NextOrFailure(p.Name(), p.Next, ctx, rw, r)
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// Update built-in metrics
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vars.Report(ctx, state, ".", rcode.ToString(rw.Rcode), rw.Len, rw.Start)
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return status, err
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}
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// Name implements the CoreDNS plugin interface
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func (p MetricsPlugin) Name() string { return "metrics" }
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