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package test
import (
"io/ioutil"
"log"
"testing"
"time"
"github.com/coredns/coredns/middleware/proxy"
"github.com/coredns/coredns/middleware/test"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
func TestLookupCache(t *testing.T) {
t.Parallel()
// Start auth. CoreDNS holding the auth zone.
name, rm, err := test.TempFile(".", exampleOrg)
if err != nil {
t.Fatalf("failed to created zone: %s", err)
}
defer rm()
corefile := `example.org:0 {
file ` + name + `
}
`
i, err := CoreDNSServer(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
udp, _ := CoreDNSServerPorts(i, 0)
if udp == "" {
t.Fatalf("Could not get UDP listening port")
}
defer i.Stop()
// Start caching proxy CoreDNS that we want to test.
corefile = `example.org:0 {
proxy . ` + udp + `
cache
}
`
i, err = CoreDNSServer(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
udp, _ = CoreDNSServerPorts(i, 0)
if udp == "" {
t.Fatalf("Could not get UDP listening port")
}
defer i.Stop()
log.SetOutput(ioutil.Discard)
p := proxy.NewLookup([]string{udp})
state := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
resp, err := p.Lookup(state, "example.org.", dns.TypeA)
if err != nil {
t.Fatal("Expected to receive reply, but didn't")
}
// expect answer section with A record in it
if len(resp.Answer) == 0 {
t.Fatal("Expected to at least one RR in the answer section, got none")
}
ttl := resp.Answer[0].Header().Ttl
time.Sleep(2 * time.Second) // TODO(miek): meh.
resp, err = p.Lookup(state, "example.org.", dns.TypeA)
if err != nil {
t.Fatal("Expected to receive reply, but didn't")
}
// expect answer section with A record in it
if len(resp.Answer) == 0 {
t.Error("Expected to at least one RR in the answer section, got none")
}
newTTL := resp.Answer[0].Header().Ttl
if newTTL >= ttl {
t.Errorf("Expected TTL to be lower than: %d, got %d", ttl, newTTL)
}
}
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