diff --git a/common/types.go b/common/types.go
deleted file mode 100644
index 8949021..0000000
--- a/common/types.go
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-package common
-
-import (
-	"fmt"
-	"sync"
-
-	"github.com/dtm-labs/dtm/dtmcli/logger"
-	"github.com/go-redis/redis/v8"
-)
-
-var rdb *redis.Client
-var once sync.Once
-
-func RedisGet() *redis.Client {
-	once.Do(func() {
-		logger.Debugf("connecting to redis: %v", Config.Store)
-		rdb = redis.NewClient(&redis.Options{
-			Addr:     fmt.Sprintf("%s:%d", Config.Store.Host, Config.Store.Port),
-			Username: Config.Store.User,
-			Password: Config.Store.Password,
-		})
-	})
-	return rdb
-}
diff --git a/common/types_test.go b/common/types_test.go
index 7bb5500..72203d0 100644
--- a/common/types_test.go
+++ b/common/types_test.go
@@ -20,6 +20,7 @@ func TestGeneralDB(t *testing.T) {
 		testDbAlone(t)
 	}
 }
+
 func testSql(t *testing.T) {
 	db := DbGet(Config.Store.GetDBConf())
 	err := func() (rerr error) {
diff --git a/dtmsvr/storage/redis/redis.go b/dtmsvr/storage/redis/redis.go
index 60ec8fd..b32872b 100644
--- a/dtmsvr/storage/redis/redis.go
+++ b/dtmsvr/storage/redis/redis.go
@@ -3,6 +3,7 @@ package redis
 import (
 	"context"
 	"fmt"
+	"sync"
 	"time"
 
 	"github.com/go-redis/redis/v8"
@@ -14,10 +15,13 @@ import (
 	"github.com/dtm-labs/dtm/dtmsvr/storage"
 )
 
+// TODO: optimize this, it's very strange to use pointer to common.Config
 var config = &common.Config
 
-var ctx context.Context = context.Background()
+// TODO: optimize this, all function should have context as first parameter
+var ctx = context.Background()
 
+// RedisStore is the storage with redis, all transaction information will bachend with redis
 type RedisStore struct {
 }
 
@@ -266,6 +270,19 @@ redis.call('SET', KEYS[1], ARGV[3], 'EX', ARGV[2])
 	dtmimp.E2P(err)
 }
 
+var (
+	rdb  *redis.Client
+	once sync.Once
+)
+
 func redisGet() *redis.Client {
-	return common.RedisGet()
+	once.Do(func() {
+		logger.Debugf("connecting to redis: %v", config.Store)
+		rdb = redis.NewClient(&redis.Options{
+			Addr:     fmt.Sprintf("%s:%d", config.Store.Host, config.Store.Port),
+			Username: config.Store.User,
+			Password: config.Store.Password,
+		})
+	})
+	return rdb
 }