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package cache
import (
"fmt"
"net"
"reflect"
"testing"
"time"
"github.com/miekg/dns"
)
func newA(name string, ttl uint32, ipAddr ...net.IP) *dns.Msg {
m := dns.Msg{}
m.Id = dns.Id()
m.SetQuestion(dns.Fqdn(name), dns.TypeA)
rr := make([]dns.RR, 0, len(ipAddr))
for _, ip := range ipAddr {
rr = append(rr, &dns.A{
A: ip,
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: ttl},
})
}
m.Answer = rr
return &m
}
func date(year int, month time.Month, day int) time.Time {
return time.Date(year, month, day, 0, 0, 0, 0, time.UTC)
}
func reverse(msgs []*dns.Msg) []*dns.Msg {
reversed := make([]*dns.Msg, 0, len(msgs))
for i := len(msgs) - 1; i >= 0; i-- {
reversed = append(reversed, msgs[i])
}
return reversed
}
func TestNewKey(t *testing.T) {
var tests = []struct {
name string
qtype, qclass uint16
out uint64
}{
{"foo.", dns.TypeA, dns.ClassINET, 12854986581909659251},
{"foo.", dns.TypeAAAA, dns.ClassINET, 12509032947198407788},
{"foo.", dns.TypeA, dns.ClassANY, 12855125120374813837},
{"bar.", dns.TypeA, dns.ClassINET, 4069151952488606484},
}
for i, tt := range tests {
got := NewKey(tt.name, tt.qtype, tt.qclass)
if got != tt.out {
t.Errorf("#%d: NewKey(%q, %d, %d) = %d, want %d", i, tt.name, tt.qtype, tt.qclass, got, tt.out)
}
}
}
func awaitExpiry(t *testing.T, c *Cache, k uint64) {
now := time.Now()
for {
c.mu.RLock()
_, ok := c.values[k]
c.mu.RUnlock()
if !ok {
break
}
time.Sleep(10 * time.Millisecond)
if time.Since(now) > 2*time.Second {
t.Fatalf("timed out waiting for expiry of key %d", k)
}
}
}
func TestCache(t *testing.T) {
msg := newA("r1.", 60, net.ParseIP("192.0.2.1"), net.ParseIP("192.0.2.2"))
msgWithZeroTTL := newA("r2.", 0, net.ParseIP("192.0.2.2"))
msgFailure := newA("r3.", 60, net.ParseIP("192.0.2.2"))
msgFailure.Rcode = dns.RcodeServerFailure
msgNameError := &dns.Msg{}
msgNameError.Id = dns.Id()
msgNameError.SetQuestion(dns.Fqdn("r4."), dns.TypeA)
msgNameError.Rcode = dns.RcodeNameError
msgLowerNsTTL := newA("r5.", 60, net.ParseIP("192.0.2.1"))
msgLowerNsTTL.Ns = []dns.RR{&dns.NS{Hdr: dns.RR_Header{Name: "ns1.r5.", Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 30}}}
msgLowerExtraTTL := newA("r6.", 3600, net.ParseIP("192.0.2.1"))
msgLowerExtraTTL.Ns = []dns.RR{&dns.NS{Hdr: dns.RR_Header{Name: "ns1.r6.", Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60}}}
msgLowerExtraTTL.Extra = []dns.RR{
&dns.OPT{Hdr: dns.RR_Header{Name: "EDNS", Rrtype: dns.TypeOPT, Class: dns.ClassINET, Ttl: 10}}, // Ignored
&dns.A{Hdr: dns.RR_Header{Name: "ns1.r6.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 30}},
}
now := date(2019, 1, 1)
nowFn := func() time.Time { return now }
c := newCache(100, 10*time.Millisecond, nowFn)
defer c.Close()
var tests = []struct {
msg *dns.Msg
queriedAt time.Time
ok bool
value *Value
}{
{msg, now, true, &Value{CreatedAt: now, msg: msg}}, // Not expired when query time == create time
{msg, now.Add(30 * time.Second), true, &Value{CreatedAt: now, msg: msg}}, // Not expired when below TTL
{msg, now.Add(60 * time.Second), true, &Value{CreatedAt: now, msg: msg}}, // Not expired until TTL exceeds
{msgNameError, now, true, &Value{CreatedAt: now, msg: msgNameError}}, // NXDOMAIN is cached
{msg, now.Add(61 * time.Second), false, nil}, // Expired due to answer TTL
{msgLowerNsTTL, now.Add(31 * time.Second), false, nil}, // Expired due to lower NS TTL
{msgLowerExtraTTL, now.Add(31 * time.Second), false, nil}, // Expired due to lower Extra TTL
{msgWithZeroTTL, now, false, nil}, // 0 TTL is not cached
{msgFailure, now, false, nil}, // Non-cacheable rcode
}
for i, tt := range tests {
c.now = nowFn
k := NewKey(tt.msg.Question[0].Name, tt.msg.Question[0].Qtype, tt.msg.Question[0].Qclass)
c.Set(k, tt.msg)
c.now = func() time.Time { return tt.queriedAt }
if msg, ok := c.Get(k); ok != tt.ok {
t.Errorf("#%d: Get(%d) = (%+v, %t), want (_, %t)", i, k, msg, ok, tt.ok)
}
if v, ok := c.getValue(k); ok != tt.ok || !reflect.DeepEqual(v, tt.value) {
t.Errorf("#%d: getValue(%d) = (%+v, %t), want (%+v, %t)", i, k, v, ok, tt.value, tt.ok)
}
if !tt.ok {
awaitExpiry(t, c, k)
}
if _, ok := c.values[k]; ok != tt.ok {
t.Errorf("#%d: values[%d] = %t, want %t", i, k, ok, tt.ok)
}
keyIdx := -1
for i, key := range c.keys {
if key == k {
keyIdx = i
break
}
}
if (keyIdx != -1) != tt.ok {
t.Errorf("#%d: keys[%d] = %d, got expired key", i, keyIdx, k)
}
}
}
func TestCacheCapacity(t *testing.T) {
var tests = []struct {
addCount, capacity, size int
}{
{1, 0, 0},
{1, 2, 1},
{2, 2, 2},
{3, 2, 2},
}
for i, tt := range tests {
c := New(tt.capacity)
defer c.Close()
var msgs []*dns.Msg
for i := 0; i < tt.addCount; i++ {
m := newA(fmt.Sprintf("r%d", i), 60, net.ParseIP(fmt.Sprintf("192.0.2.%d", i)))
k := NewKey(m.Question[0].Name, m.Question[0].Qtype, m.Question[0].Qclass)
msgs = append(msgs, m)
c.Set(k, m)
}
if got := len(c.values); got != tt.size {
t.Errorf("#%d: len(values) = %d, want %d", i, got, tt.size)
}
if tt.capacity > 0 && tt.addCount > tt.capacity && tt.capacity == tt.size {
lastAdded := msgs[tt.addCount-1].Question[0]
lastK := NewKey(lastAdded.Name, lastAdded.Qtype, lastAdded.Qclass)
if _, ok := c.Get(lastK); !ok {
t.Errorf("#%d: Get(NewKey(%q, _, _)) = (_, %t), want (_, %t)", i, lastAdded.Name, ok, !ok)
}
firstAdded := msgs[0].Question[0]
firstK := NewKey(firstAdded.Name, firstAdded.Qtype, firstAdded.Qclass)
if _, ok := c.Get(firstK); ok {
t.Errorf("#%d: Get(NewKey(%q, _, _)) = (_, %t), want (_, %t)", i, firstAdded.Name, ok, !ok)
}
}
}
}
func TestCacheList(t *testing.T) {
var tests = []struct {
addCount, listCount, wantCount int
expire bool
}{
{0, 0, 0, false},
{1, 0, 0, false},
{1, 1, 1, false},
{2, 1, 1, false},
{2, 3, 2, false},
{2, 0, 0, true},
}
for i, tt := range tests {
c := New(1024)
defer c.Close()
var msgs []*dns.Msg
for i := 0; i < tt.addCount; i++ {
m := newA(fmt.Sprintf("r%d", i), 60, net.ParseIP(fmt.Sprintf("192.0.2.%d", i)))
k := NewKey(m.Question[0].Name, m.Question[0].Qtype, m.Question[0].Qclass)
msgs = append(msgs, m)
c.Set(k, m)
}
if tt.expire {
c.now = func() time.Time { return time.Now().Add(time.Minute).Add(time.Second) }
}
values := c.List(tt.listCount)
if got := len(values); got != tt.wantCount {
t.Errorf("#%d: len(List(%d)) = %d, want %d", i, tt.listCount, got, tt.wantCount)
}
gotMsgs := make([]*dns.Msg, 0, len(values))
for _, v := range values {
gotMsgs = append(gotMsgs, v.msg)
}
msgs = reverse(msgs)
want := msgs[:tt.wantCount]
if !reflect.DeepEqual(want, gotMsgs) {
t.Errorf("#%d: got %+v, want %+v", i, gotMsgs, want)
}
}
}
func TestReset(t *testing.T) {
c := New(10)
c.Set(uint64(1), &dns.Msg{})
c.Reset()
if got, want := len(c.values), 0; got != want {
t.Errorf("len(values) = %d, want %d", got, want)
}
if got, want := len(c.keys), 0; got != want {
t.Errorf("len(keys) = %d, want %d", got, want)
}
}
func BenchmarkNewKey(b *testing.B) {
for n := 0; n < b.N; n++ {
NewKey("key", 1, 1)
}
}
func BenchmarkCache(b *testing.B) {
c := New(1000)
b.ResetTimer()
for n := 0; n < b.N; n++ {
c.Set(uint64(n), &dns.Msg{})
c.Get(uint64(n))
}
}
func BenchmarkCacheEviction(b *testing.B) {
c := New(1)
b.ResetTimer()
for n := 0; n < b.N; n++ {
c.Set(uint64(n), &dns.Msg{})
c.Get(uint64(n))
}
}
|
