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package cache
import (
"fmt"
"testing"
"time"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/cache"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
"golang.org/x/net/context"
)
var p = false
func TestPrefetch(t *testing.T) {
c := &Cache{Zones: []string{"."}, pcap: defaultCap, ncap: defaultCap, pttl: maxTTL, nttl: maxTTL}
c.pcache = cache.New(c.pcap)
c.ncache = cache.New(c.ncap)
c.prefetch = 1
c.duration = 1 * time.Second
c.Next = PrefetchHandler(t, dns.RcodeSuccess, nil)
ctx := context.TODO()
req := new(dns.Msg)
req.SetQuestion("lowttl.example.org.", dns.TypeA)
rec := dnstest.NewRecorder(&test.ResponseWriter{})
c.ServeDNS(ctx, rec, req)
p = true // prefetch should be true for the 2nd fetch
c.ServeDNS(ctx, rec, req)
}
func PrefetchHandler(t *testing.T, rcode int, err error) plugin.Handler {
return plugin.HandlerFunc(func(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
m := new(dns.Msg)
m.SetQuestion("lowttl.example.org.", dns.TypeA)
m.Response = true
m.RecursionAvailable = true
m.Answer = append(m.Answer, test.A("lowttl.example.org. 80 IN A 127.0.0.53"))
if p != w.(*ResponseWriter).prefetch {
err = fmt.Errorf("cache prefetch not equal to p: got %t, want %t", p, w.(*ResponseWriter).prefetch)
t.Fatal(err)
}
w.WriteMsg(m)
return rcode, err
})
}
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