初步实验使用KV数据库（pebble）存储缓存索引

internal/utils/kvstore/utils.go

@@ -0,0 +1,50 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package kvstore
+
+import (
+	"errors"
+	"os"
+	"regexp"
+	"strings"
+)
+
+var nameRegexp = regexp.MustCompile(`^[a-zA-Z0-9_.-]+$`)
+
+// IsValidName check if store name or database name or table name is valid
+func IsValidName(name string) bool {
+	return nameRegexp.MatchString(name)
+}
+
+// RemoveStore remove store directory
+func RemoveStore(path string) error {
+	var errNotStoreDirectory = errors.New("not store directory")
+
+	if strings.HasSuffix(path, StoreSuffix) {
+		_, err := os.Stat(path)
+		if err != nil {
+			if os.IsNotExist(err) {
+				return nil
+			}
+			return err
+		}
+
+		// validate store
+		{
+			_, err = os.Stat(path + "/CURRENT")
+			if err != nil {
+				return errNotStoreDirectory
+			}
+		}
+		{
+			_, err = os.Stat(path + "/LOCK")
+			if err != nil {
+				return errNotStoreDirectory
+			}
+		}
+
+		return os.RemoveAll(path)
+	}
+
+	return errNotStoreDirectory
+}