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package stringutil
import (
"fmt"
"math/rand"
"sync"
"time"
)
var uuidRand = rand.New(rand.NewSource(time.Now().UnixNano()))
var uuidMutex = &sync.Mutex{}
// UUID generates a random UUID according to RFC 4122.
func UUID() string {
uuid := make([]byte, 16)
uuidMutex.Lock()
_, _ = uuidRand.Read(uuid)
uuidMutex.Unlock()
// variant bits; see section 4.1.1
uuid[8] = uuid[8]&^0xc0 | 0x80
// version 4 (pseudo-random); see section 4.1.3
uuid[6] = uuid[6]&^0xf0 | 0x40
return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:])
}
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