775d26c5e2
* Add metrics for cache hits/misses Add counters for cache middleware hits and misses. * Add test for cache middleware hit/miss counters. * Fix cache hit metric incrementing. * Add cache hit/miss metrics to dnssec middleware. * Update README metric documentation.
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package dnssec
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import (
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"github.com/miekg/coredns/middleware"
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"github.com/miekg/coredns/request"
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"github.com/miekg/dns"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/net/context"
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)
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// ServeDNS implements the middleware.Handler interface.
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func (d Dnssec) 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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do := state.Do()
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qname := state.Name()
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qtype := state.QType()
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zone := middleware.Zones(d.zones).Matches(qname)
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if zone == "" {
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return d.Next.ServeDNS(ctx, w, r)
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}
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// Intercept queries for DNSKEY, but only if one of the zones matches the qname, otherwise we let
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// the query through.
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if qtype == dns.TypeDNSKEY {
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for _, z := range d.zones {
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if qname == z {
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resp := d.getDNSKEY(state, z, do)
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resp.Authoritative = true
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state.SizeAndDo(resp)
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w.WriteMsg(resp)
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return dns.RcodeSuccess, nil
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}
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}
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}
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drr := &ResponseWriter{w, d}
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return d.Next.ServeDNS(ctx, drr, r)
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}
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var (
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cacheSize = prometheus.NewGaugeVec(prometheus.GaugeOpts{
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Namespace: middleware.Namespace,
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Subsystem: subsystem,
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Name: "cache_size",
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Help: "The number of elements in the dnssec cache.",
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}, []string{"type"})
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cacheCapacity = prometheus.NewGaugeVec(prometheus.GaugeOpts{
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Namespace: middleware.Namespace,
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Subsystem: subsystem,
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Name: "cache_capacity",
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Help: "The dnssec cache's capacity.",
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}, []string{"type"})
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cacheHits = prometheus.NewCounter(prometheus.CounterOpts{
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Namespace: middleware.Namespace,
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Subsystem: subsystem,
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Name: "cache_hits_total",
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Help: "The count of cache hits.",
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})
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cacheMisses = prometheus.NewCounter(prometheus.CounterOpts{
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Namespace: middleware.Namespace,
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Subsystem: subsystem,
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Name: "cache_misses_total",
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Help: "The count of cache misses.",
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})
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)
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// Name implements the Handler interface.
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func (d Dnssec) Name() string { return "dnssec" }
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const subsystem = "dnssec"
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func init() {
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prometheus.MustRegister(cacheSize)
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prometheus.MustRegister(cacheCapacity)
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prometheus.MustRegister(cacheHits)
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prometheus.MustRegister(cacheMisses)
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}
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