Official Go implementation of the Ethereum protocol
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go-ethereum/common/lru/basiclru_test.go

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// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package lru
import (
crand "crypto/rand"
"fmt"
"io"
"math/rand"
"testing"
)
// Some of these test cases were adapted
// from https://github.com/hashicorp/golang-lru/blob/master/simplelru/lru_test.go
func TestBasicLRU(t *testing.T) {
cache := NewBasicLRU[int, int](128)
for i := 0; i < 256; i++ {
cache.Add(i, i)
}
if cache.Len() != 128 {
t.Fatalf("bad len: %v", cache.Len())
}
// Check that Keys returns least-recent key first.
keys := cache.Keys()
if len(keys) != 128 {
t.Fatal("wrong Keys() length", len(keys))
}
for i, k := range keys {
v, ok := cache.Peek(k)
if !ok {
t.Fatalf("expected key %d be present", i)
}
if v != k {
t.Fatalf("expected %d == %d", k, v)
}
if v != i+128 {
t.Fatalf("wrong value at key %d: %d, want %d", i, v, i+128)
}
}
for i := 0; i < 128; i++ {
_, ok := cache.Get(i)
if ok {
t.Fatalf("%d should be evicted", i)
}
}
for i := 128; i < 256; i++ {
_, ok := cache.Get(i)
if !ok {
t.Fatalf("%d should not be evicted", i)
}
}
for i := 128; i < 192; i++ {
ok := cache.Remove(i)
if !ok {
t.Fatalf("%d should be in cache", i)
}
ok = cache.Remove(i)
if ok {
t.Fatalf("%d should not be in cache", i)
}
_, ok = cache.Get(i)
if ok {
t.Fatalf("%d should be deleted", i)
}
}
// Request item 192.
cache.Get(192)
// It should be the last item returned by Keys().
for i, k := range cache.Keys() {
if (i < 63 && k != i+193) || (i == 63 && k != 192) {
t.Fatalf("out of order key: %v", k)
}
}
cache.Purge()
if cache.Len() != 0 {
t.Fatalf("bad len: %v", cache.Len())
}
if _, ok := cache.Get(200); ok {
t.Fatalf("should contain nothing")
}
}
func TestBasicLRUAddExistingKey(t *testing.T) {
cache := NewBasicLRU[int, int](1)
cache.Add(1, 1)
cache.Add(1, 2)
v, _ := cache.Get(1)
if v != 2 {
t.Fatal("wrong value:", v)
}
}
// This test checks GetOldest and RemoveOldest.
func TestBasicLRUGetOldest(t *testing.T) {
cache := NewBasicLRU[int, int](128)
for i := 0; i < 256; i++ {
cache.Add(i, i)
}
k, _, ok := cache.GetOldest()
if !ok {
t.Fatalf("missing")
}
if k != 128 {
t.Fatalf("bad: %v", k)
}
k, _, ok = cache.RemoveOldest()
if !ok {
t.Fatalf("missing")
}
if k != 128 {
t.Fatalf("bad: %v", k)
}
k, _, ok = cache.RemoveOldest()
if !ok {
t.Fatalf("missing oldest item")
}
if k != 129 {
t.Fatalf("wrong oldest item: %v", k)
}
}
// Test that Add returns true/false if an eviction occurred
func TestBasicLRUAddReturnValue(t *testing.T) {
cache := NewBasicLRU[int, int](1)
if cache.Add(1, 1) {
t.Errorf("first add shouldn't have evicted")
}
if !cache.Add(2, 2) {
t.Errorf("second add should have evicted")
}
}
// This test verifies that Contains doesn't change item recency.
func TestBasicLRUContains(t *testing.T) {
cache := NewBasicLRU[int, int](2)
cache.Add(1, 1)
cache.Add(2, 2)
if !cache.Contains(1) {
t.Errorf("1 should be in the cache")
}
cache.Add(3, 3)
if cache.Contains(1) {
t.Errorf("Contains should not have updated recency of 1")
}
}
// Test that Peek doesn't update recent-ness
func TestBasicLRUPeek(t *testing.T) {
cache := NewBasicLRU[int, int](2)
cache.Add(1, 1)
cache.Add(2, 2)
if v, ok := cache.Peek(1); !ok || v != 1 {
t.Errorf("1 should be set to 1")
}
cache.Add(3, 3)
if cache.Contains(1) {
t.Errorf("should not have updated recent-ness of 1")
}
}
func BenchmarkLRU(b *testing.B) {
var (
capacity = 1000
indexes = make([]int, capacity*20)
keys = make([]string, capacity)
values = make([][]byte, capacity)
)
for i := range indexes {
indexes[i] = rand.Intn(capacity)
}
for i := range keys {
b := make([]byte, 32)
crand.Read(b)
keys[i] = string(b)
crand.Read(b)
values[i] = b
}
var sink []byte
b.Run("Add/BasicLRU", func(b *testing.B) {
cache := NewBasicLRU[int, int](capacity)
for i := 0; i < b.N; i++ {
cache.Add(i, i)
}
})
b.Run("Get/BasicLRU", func(b *testing.B) {
cache := NewBasicLRU[string, []byte](capacity)
for i := 0; i < capacity; i++ {
index := indexes[i]
cache.Add(keys[index], values[index])
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
k := keys[indexes[i%len(indexes)]]
v, ok := cache.Get(k)
if ok {
sink = v
}
}
})
// // vs. github.com/hashicorp/golang-lru/simplelru
// b.Run("Add/simplelru.LRU", func(b *testing.B) {
// cache, _ := simplelru.NewLRU(capacity, nil)
// for i := 0; i < b.N; i++ {
// cache.Add(i, i)
// }
// })
// b.Run("Get/simplelru.LRU", func(b *testing.B) {
// cache, _ := simplelru.NewLRU(capacity, nil)
// for i := 0; i < capacity; i++ {
// index := indexes[i]
// cache.Add(keys[index], values[index])
// }
//
// b.ResetTimer()
// for i := 0; i < b.N; i++ {
// k := keys[indexes[i%len(indexes)]]
// v, ok := cache.Get(k)
// if ok {
// sink = v.([]byte)
// }
// }
// })
fmt.Fprintln(io.Discard, sink)
}