a big bug?

[forezp]

code:

import (
	"crypto/md5"
	"fmt"
	"github.com/coocood/freecache"
	"strconv"
)

var (
	defaultCache *freecache.Cache
)

func main() {
	Init()
	keyPrefix := "awdwoiejorejfewknr3kjio4jo43jodfnkfnfrkfrnrkfrjireire"
	var keyexist string
	for i := 0; i < 10000000; i++ {
		k := keyPrefix + strconv.Itoa(i)
		kMd5Str := Md5(k)

		SetString(kMd5Str, "1")
		if i == 99 {
			keyexist = kMd5Str
			fmt.Println("keyexist is  exist ? =", Exist(keyexist))
		}
	}
	fmt.Println("keyexist is  exist ? =", Exist(keyexist))
}

func Init() {
	cacheSize := 500 * 1024 * 1024
	c := freecache.NewCache(cacheSize)
	defaultCache = c
}

func SetString(key, value string) {
	defaultCache.Set([]byte(key), []byte(value), 300)
}

func Exist(key string) bool {
	b, err := defaultCache.Get([]byte(key))
	if err != nil {
		return false
	}
	if len(b) > 0 {
		return true
	}
	return false
}

func Get(key string) []byte {
	b, err := defaultCache.Get([]byte(key))
	if err == nil {
		if len(b) > 0 {
			return b
		}
	}
	return nil
}

func GetString(key string) string {
	b := Get(key)
	if len(b) > 0 {
		return string(b)
	}
	return ""
}

func Length() int {
	return int(defaultCache.EntryCount())
}

func Md5(str string) string {
	data := []byte(str)
	has := md5.Sum(data)
	md5str1 := fmt.Sprintf("%x", has) //将[]byte转成16进制
	return md5str1
}

output:

keyexist is  exist ? = true
keyexist is  exist ? = false

[coocood]

The cache is full and the key is evicted.

fmt.Println(defaultCache.EntryCount(), defaultCache.EvacuateCount())

[forezp]

The cache is full and the key is evicted.

fmt.Println(defaultCache.EntryCount(), defaultCache.EvacuateCount())

you are right ,thank you for yourhelp!

[OoXoSoO]

Hi @coocood

Can you explain me if it is possible that the get function return no error and nil value when the key is evicted?
If it is, How can I difreneciate an empty value from an evicted value? If set a len 0 slice, the get returns to me a nil value.

[coocood]

Hi @coocood

Can you explain me if it is possible that the get function return no error and nil value when the key is evicted? If it is, How can I difreneciate an empty value from an evicted value? If set a len 0 slice, the get returns to me a nil value.

If the key is not found, ErrorNotFound should be returned.