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package cancel
import (
"context"
"testing"
"time"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
)
type sleepPlugin struct{}
func (s sleepPlugin) Name() string { return "sleep" }
func (s sleepPlugin) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
i := 0
m := new(dns.Msg)
m.SetReply(r)
for {
if plugin.Done(ctx) {
m.Rcode = dns.RcodeBadTime // use BadTime to return something time related
w.WriteMsg(m)
return 0, nil
}
time.Sleep(20 * time.Millisecond)
i++
if i > 2 {
m.Rcode = dns.RcodeServerFailure
w.WriteMsg(m)
return 0, nil
}
}
}
func TestCancel(t *testing.T) {
ca := Cancel{Next: sleepPlugin{}, timeout: 20 * time.Millisecond}
ctx := context.Background()
w := dnstest.NewRecorder(&test.ResponseWriter{})
m := new(dns.Msg)
m.SetQuestion("aaa.example.com.", dns.TypeTXT)
ca.ServeDNS(ctx, w, m)
if w.Rcode != dns.RcodeBadTime {
t.Error("Expected ServeDNS to be canceled by context")
}
}
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