Update leveldb

Signed-off-by: Yuan Si <do4suki@gmail.com>

db/db.go

@@ -0,0 +1,21 @@
+package db
+
+import "fmt"
+
+var (
+	DB *Instance
+)
+
+func init() {
+	DB = GetInstance()
+}
+
+func MatchTokenUid(token, uid string) bool {
+	res, err := DB.Get([]byte(uid))
+	if err != nil {
+		fmt.Println(err)
+		return false
+	}
+
+	return string(res) == token
+}