/
expirable_lru_test.go
519 lines (439 loc) · 10.3 KB
/
expirable_lru_test.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package expirable
import (
"crypto/rand"
"fmt"
"math"
"math/big"
"reflect"
"sync"
"testing"
"time"
"github.com/hashicorp/golang-lru/v2/simplelru"
)
func BenchmarkLRU_Rand_NoExpire(b *testing.B) {
l := NewLRU[int64, int64](8192, nil, 0)
trace := make([]int64, b.N*2)
for i := 0; i < b.N*2; i++ {
trace[i] = getRand(b) % 32768
}
b.ResetTimer()
var hit, miss int
for i := 0; i < 2*b.N; i++ {
if i%2 == 0 {
l.Add(trace[i], trace[i])
} else {
if _, ok := l.Get(trace[i]); ok {
hit++
} else {
miss++
}
}
}
b.Logf("hit: %d miss: %d ratio: %f", hit, miss, float64(hit)/float64(hit+miss))
}
func BenchmarkLRU_Freq_NoExpire(b *testing.B) {
l := NewLRU[int64, int64](8192, nil, 0)
trace := make([]int64, b.N*2)
for i := 0; i < b.N*2; i++ {
if i%2 == 0 {
trace[i] = getRand(b) % 16384
} else {
trace[i] = getRand(b) % 32768
}
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
l.Add(trace[i], trace[i])
}
var hit, miss int
for i := 0; i < b.N; i++ {
if _, ok := l.Get(trace[i]); ok {
hit++
} else {
miss++
}
}
b.Logf("hit: %d miss: %d ratio: %f", hit, miss, float64(hit)/float64(hit+miss))
}
func BenchmarkLRU_Rand_WithExpire(b *testing.B) {
l := NewLRU[int64, int64](8192, nil, time.Millisecond*10)
trace := make([]int64, b.N*2)
for i := 0; i < b.N*2; i++ {
trace[i] = getRand(b) % 32768
}
b.ResetTimer()
var hit, miss int
for i := 0; i < 2*b.N; i++ {
if i%2 == 0 {
l.Add(trace[i], trace[i])
} else {
if _, ok := l.Get(trace[i]); ok {
hit++
} else {
miss++
}
}
}
b.Logf("hit: %d miss: %d ratio: %f", hit, miss, float64(hit)/float64(hit+miss))
}
func BenchmarkLRU_Freq_WithExpire(b *testing.B) {
l := NewLRU[int64, int64](8192, nil, time.Millisecond*10)
trace := make([]int64, b.N*2)
for i := 0; i < b.N*2; i++ {
if i%2 == 0 {
trace[i] = getRand(b) % 16384
} else {
trace[i] = getRand(b) % 32768
}
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
l.Add(trace[i], trace[i])
}
var hit, miss int
for i := 0; i < b.N; i++ {
if _, ok := l.Get(trace[i]); ok {
hit++
} else {
miss++
}
}
b.Logf("hit: %d miss: %d ratio: %f", hit, miss, float64(hit)/float64(hit+miss))
}
func TestLRUInterface(_ *testing.T) {
var _ simplelru.LRUCache[int, int] = &LRU[int, int]{}
}
func TestLRUNoPurge(t *testing.T) {
lc := NewLRU[string, string](10, nil, 0)
lc.Add("key1", "val1")
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
v, ok := lc.Peek("key1")
if v != "val1" {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
if !lc.Contains("key1") {
t.Fatalf("should contain key1")
}
if lc.Contains("key2") {
t.Fatalf("should not contain key2")
}
v, ok = lc.Peek("key2")
if v != "" {
t.Fatalf("should be empty")
}
if ok {
t.Fatalf("should be false")
}
if !reflect.DeepEqual(lc.Keys(), []string{"key1"}) {
t.Fatalf("value differs from expected")
}
if lc.Resize(0) != 0 {
t.Fatalf("evicted count differs from expected")
}
if lc.Resize(2) != 0 {
t.Fatalf("evicted count differs from expected")
}
lc.Add("key2", "val2")
if lc.Resize(1) != 1 {
t.Fatalf("evicted count differs from expected")
}
}
func TestLRUEdgeCases(t *testing.T) {
lc := NewLRU[string, *string](2, nil, 0)
// Adding a nil value
lc.Add("key1", nil)
value, exists := lc.Get("key1")
if value != nil || !exists {
t.Fatalf("unexpected value or existence flag for key1: value=%v, exists=%v", value, exists)
}
// Adding an entry with the same key but different value
newVal := "val1"
lc.Add("key1", &newVal)
value, exists = lc.Get("key1")
if value != &newVal || !exists {
t.Fatalf("unexpected value or existence flag for key1: value=%v, exists=%v", value, exists)
}
}
func TestLRU_Values(t *testing.T) {
lc := NewLRU[string, string](3, nil, 0)
lc.Add("key1", "val1")
lc.Add("key2", "val2")
lc.Add("key3", "val3")
values := lc.Values()
if !reflect.DeepEqual(values, []string{"val1", "val2", "val3"}) {
t.Fatalf("values differs from expected")
}
}
// func TestExpirableMultipleClose(_ *testing.T) {
// lc := NewLRU[string, string](10, nil, 0)
// lc.Close()
// // should not panic
// lc.Close()
// }
func TestLRUWithPurge(t *testing.T) {
var evicted []string
lc := NewLRU(10, func(key string, value string) { evicted = append(evicted, key, value) }, 150*time.Millisecond)
k, v, ok := lc.GetOldest()
if k != "" {
t.Fatalf("should be empty")
}
if v != "" {
t.Fatalf("should be empty")
}
if ok {
t.Fatalf("should be false")
}
lc.Add("key1", "val1")
time.Sleep(100 * time.Millisecond) // not enough to expire
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
v, ok = lc.Get("key1")
if v != "val1" {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
time.Sleep(200 * time.Millisecond) // expire
v, ok = lc.Get("key1")
if ok {
t.Fatalf("should be false")
}
if v != "" {
t.Fatalf("should be nil")
}
if lc.Len() != 0 {
t.Fatalf("length differs from expected")
}
if !reflect.DeepEqual(evicted, []string{"key1", "val1"}) {
t.Fatalf("value differs from expected")
}
// add new entry
lc.Add("key2", "val2")
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
k, v, ok = lc.GetOldest()
if k != "key2" {
t.Fatalf("value differs from expected")
}
if v != "val2" {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
// DeleteExpired, nothing deleted
lc.deleteExpired()
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
if !reflect.DeepEqual(evicted, []string{"key1", "val1"}) {
t.Fatalf("value differs from expected")
}
// Purge, cache should be clean
lc.Purge()
if lc.Len() != 0 {
t.Fatalf("length differs from expected")
}
if !reflect.DeepEqual(evicted, []string{"key1", "val1", "key2", "val2"}) {
t.Fatalf("value differs from expected")
}
}
func TestLRUWithPurgeEnforcedBySize(t *testing.T) {
lc := NewLRU[string, string](10, nil, time.Hour)
for i := 0; i < 100; i++ {
i := i
lc.Add(fmt.Sprintf("key%d", i), fmt.Sprintf("val%d", i))
v, ok := lc.Get(fmt.Sprintf("key%d", i))
if v != fmt.Sprintf("val%d", i) {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
if lc.Len() > 20 {
t.Fatalf("length should be less than 20")
}
}
if lc.Len() != 10 {
t.Fatalf("length differs from expected")
}
}
func TestLRUConcurrency(t *testing.T) {
lc := NewLRU[string, string](0, nil, 0)
wg := sync.WaitGroup{}
wg.Add(1000)
for i := 0; i < 1000; i++ {
go func(i int) {
lc.Add(fmt.Sprintf("key-%d", i/10), fmt.Sprintf("val-%d", i/10))
wg.Done()
}(i)
}
wg.Wait()
if lc.Len() != 100 {
t.Fatalf("length differs from expected")
}
}
func TestLRUInvalidateAndEvict(t *testing.T) {
var evicted int
lc := NewLRU(-1, func(_, _ string) { evicted++ }, 0)
lc.Add("key1", "val1")
lc.Add("key2", "val2")
val, ok := lc.Get("key1")
if !ok {
t.Fatalf("should be true")
}
if val != "val1" {
t.Fatalf("value differs from expected")
}
if evicted != 0 {
t.Fatalf("value differs from expected")
}
lc.Remove("key1")
if evicted != 1 {
t.Fatalf("value differs from expected")
}
val, ok = lc.Get("key1")
if val != "" {
t.Fatalf("should be empty")
}
if ok {
t.Fatalf("should be false")
}
}
func TestLoadingExpired(t *testing.T) {
lc := NewLRU[string, string](0, nil, time.Millisecond*5)
lc.Add("key1", "val1")
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
v, ok := lc.Peek("key1")
if v != "val1" {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
v, ok = lc.Get("key1")
if v != "val1" {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
time.Sleep(time.Millisecond * 100) // wait for entry to expire
if lc.Len() != 0 {
t.Fatalf("length differs from expected")
}
v, ok = lc.Peek("key1")
if v != "" {
t.Fatalf("should be empty")
}
if ok {
t.Fatalf("should be false")
}
v, ok = lc.Get("key1")
if v != "" {
t.Fatalf("should be empty")
}
if ok {
t.Fatalf("should be false")
}
}
func TestLRURemoveOldest(t *testing.T) {
lc := NewLRU[string, string](2, nil, 0)
k, v, ok := lc.RemoveOldest()
if k != "" {
t.Fatalf("should be empty")
}
if v != "" {
t.Fatalf("should be empty")
}
if ok {
t.Fatalf("should be false")
}
ok = lc.Remove("non_existent")
if ok {
t.Fatalf("should be false")
}
lc.Add("key1", "val1")
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
v, ok = lc.Get("key1")
if !ok {
t.Fatalf("should be true")
}
if v != "val1" {
t.Fatalf("value differs from expected")
}
if !reflect.DeepEqual(lc.Keys(), []string{"key1"}) {
t.Fatalf("value differs from expected")
}
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
lc.Add("key2", "val2")
if !reflect.DeepEqual(lc.Keys(), []string{"key1", "key2"}) {
t.Fatalf("value differs from expected")
}
if lc.Len() != 2 {
t.Fatalf("length differs from expected")
}
k, v, ok = lc.RemoveOldest()
if k != "key1" {
t.Fatalf("value differs from expected")
}
if v != "val1" {
t.Fatalf("value differs from expected")
}
if !ok {
t.Fatalf("should be true")
}
if !reflect.DeepEqual(lc.Keys(), []string{"key2"}) {
t.Fatalf("value differs from expected")
}
if lc.Len() != 1 {
t.Fatalf("length differs from expected")
}
}
func ExampleLRU() {
// make cache with 10ms TTL and 5 max keys
cache := NewLRU[string, string](5, nil, time.Millisecond*10)
// set value under key1.
cache.Add("key1", "val1")
// get value under key1
r, ok := cache.Get("key1")
// check for OK value
if ok {
fmt.Printf("value before expiration is found: %v, value: %q\n", ok, r)
}
// wait for cache to expire
time.Sleep(time.Millisecond * 100)
// get value under key1 after key expiration
r, ok = cache.Get("key1")
fmt.Printf("value after expiration is found: %v, value: %q\n", ok, r)
// set value under key2, would evict old entry because it is already expired.
cache.Add("key2", "val2")
fmt.Printf("Cache len: %d\n", cache.Len())
// Output:
// value before expiration is found: true, value: "val1"
// value after expiration is found: false, value: ""
// Cache len: 1
}
func getRand(tb testing.TB) int64 {
out, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64))
if err != nil {
tb.Fatal(err)
}
return out.Int64()
}