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package cache
import (
"fmt"
"net"
"testing"
"time"
"github.com/miekg/dns"
)
func TestSetGet(t *testing.T) {
c, err := NewCache(100, "")
if err != nil {
t.Fatal(err)
}
defer c.Stop()
msg := new(dns.Msg)
msg.Answer = append(msg.Answer, &dns.A{
Hdr: dns.RR_Header{Name: "example.com.", Rrtype: dns.TypeA, Ttl:300},
A: net.IPv4(1,2,3,4),
})
key := Key{Name: "example.com.", Qtype: dns.TypeA, Class: dns.ClassINET}
c.Set(key, msg, 300*time.Second)
got, ok := c.Get(key)
if !ok {
t.Fatal("expected cache hit")
}
if len(got.Answer) != 1 {
t.Fatalf("expected 1 answer, got %d", len(got.Answer))
}
a, _ := got.Answer[0].(*dns.A)
if !a.A.Equal(net.IPv4(1,2,3,4)) {
t.Errorf("IP = %s, want 1.2.3.4", a.A)
}
}
func TestExpiry(t *testing.T) {
c, _ := NewCache(10, "")
defer c.Stop()
msg := new(dns.Msg)
key := Key{Name: "x.com.", Qtype: dns.TypeA, Class: dns.ClassINET}
c.Set(key, msg, 30*time.Millisecond)
time.Sleep(60 * time.Millisecond)
_, ok := c.Get(key)
if ok {
t.Fatal("expected miss after expiry")
}
}
func TestEviction(t *testing.T) {
c, _ := NewCache(2, "")
defer c.Stop()
for i := 0; i < 5; i++ {
name := fmt.Sprintf("d%d.com.", i)
msg := new(dns.Msg)
c.Set(Key{Name: name, Qtype: dns.TypeA, Class: dns.ClassINET}, msg, 60*time.Second)
}
if c.Len() > 2 {
t.Errorf("expected ≤2 entries, got %d", c.Len())
}
}
func TestComputeTTL(t *testing.T) {
msg := new(dns.Msg)
msg.Answer = append(msg.Answer, &dns.A{
Hdr: dns.RR_Header{Name: "x.", Rrtype: dns.TypeA, Ttl: 120},
})
if d := computeTTL(msg); d != 120*time.Second {
t.Errorf("TTL = %v, want 120s", d)
}
}
func TestNegativeTTL(t *testing.T) {
msg := new(dns.Msg)
msg.Rcode = dns.RcodeNameError
msg.Ns = append(msg.Ns, &dns.SOA{
Hdr: dns.RR_Header{Name: "com.", Rrtype: dns.TypeSOA, Ttl: 900},
Minttl: 300,
})
if d := computeTTL(msg); d != 300*time.Second {
t.Errorf("negative TTL = %v, want 300s", d)
}
}
func TestRace(t *testing.T) {
c, _ := NewCache(1000, "")
defer c.Stop()
done := make(chan struct{})
go func() {
for i := 0; i < 100; i++ {
msg := new(dns.Msg)
c.Set(Key{Name: fmt.Sprintf("d%d.com.", i), Qtype: dns.TypeA, Class: dns.ClassINET}, msg, time.Second)
}
close(done)
}()
for i := 0; i < 100; i++ {
c.Get(Key{Name: fmt.Sprintf("d%d.com.", i), Qtype: dns.TypeA, Class: dns.ClassINET})
}
<-done
c.Stats()
c.Len()
}
func TestSQLitePersistence(t *testing.T) {
dir := t.TempDir()
dbPath := dir + "/cache.db"
c, err := NewCache(100, dbPath)
if err != nil {
t.Fatal(err)
}
msg := new(dns.Msg)
msg.Answer = append(msg.Answer, &dns.A{
Hdr: dns.RR_Header{Name: "x.com.", Rrtype: dns.TypeA, Ttl: 300},
A: net.IPv4(1, 2, 3, 4),
})
key := Key{Name: "x.com.", Qtype: dns.TypeA, Class: dns.ClassINET}
c.Set(key, msg, 300*time.Second)
c.Stop()
c2, err := NewCache(100, dbPath)
if err != nil {
t.Fatal(err)
}
defer c2.Stop()
got, ok := c2.Get(key)
if !ok {
t.Fatal("expected cache hit from SQLite load")
}
a, _ := got.Answer[0].(*dns.A)
if !a.A.Equal(net.IPv4(1, 2, 3, 4)) {
t.Errorf("IP = %s, want 1.2.3.4", a.A)
}
}
|
