chore: redislock use stringx.randn replace randomStr func (#1220)

core/stores/redis/redislock.go

@@ -1,6 +1,7 @@
 package redis
 
 import (
+	"github.com/tal-tech/go-zero/core/stringx"
 	"math/rand"
 	"strconv"
 	"sync/atomic"
@@ -45,7 +46,7 @@ func NewRedisLock(store *Redis, key string) *RedisLock {
 	return &RedisLock{
 		store: store,
 		key:   key,
-		id:    randomStr(randomLen),
+		id:    stringx.Randn(randomLen),
 	}
 }
 
@@ -92,11 +93,3 @@ func (rl *RedisLock) Release() (bool, error) {
 func (rl *RedisLock) SetExpire(seconds int) {
 	atomic.StoreUint32(&rl.seconds, uint32(seconds))
 }
-
-func randomStr(n int) string {
-	b := make([]byte, n)
-	for i := range b {
-		b[i] = letters[rand.Intn(len(letters))]
-	}
-	return string(b)
-}