From a6954f18efdca5b0687145cf4884a489278fc103 Mon Sep 17 00:00:00 2001
From: ras0q <ras0q@users.noreply.github.com>
Date: Wed, 13 Sep 2023 21:03:32 +0900
Subject: [PATCH 1/2] :recycle: use custom dialector

---
 infra/db/db.go | 57 +++++++++++++++++++++++++++++++++++---------------
 1 file changed, 40 insertions(+), 17 deletions(-)

diff --git a/infra/db/db.go b/infra/db/db.go
index b5c6a868..97b1ee75 100644
--- a/infra/db/db.go
+++ b/infra/db/db.go
@@ -37,24 +37,28 @@ func (repo *GormRepository) Setup(host, user, password, database, port, key, log
 	}
 	tokenKey = []byte(key)
 
+	d := dialector{
+		Dialector: mysql.New(mysql.Config{
+			DSNConfig: &gomysql.Config{
+				User:                 user,
+				Passwd:               password,
+				Net:                  "tcp",
+				Addr:                 host + ":" + port,
+				DBName:               database,
+				Loc:                  loc,
+				AllowNativePasswords: true,
+				ParseTime:            true,
+			},
+			DefaultStringSize:         256,   // default size for string fields
+			DisableDatetimePrecision:  true,  // disable datetime precision, which not supported before MySQL 5.6
+			DontSupportRenameIndex:    true,  // drop & create when rename index, rename index not supported before MySQL 5.7, MariaDB
+			DontSupportRenameColumn:   false, // `change` when rename column, rename column not supported before MySQL 8, MariaDB
+			SkipInitializeWithVersion: false, // auto configure based on currently MySQL version
+		}),
+	}
+
 	var err error
-	repo.db, err = gorm.Open(mysql.New(mysql.Config{
-		DSNConfig: &gomysql.Config{
-			User:                 user,
-			Passwd:               password,
-			Net:                  "tcp",
-			Addr:                 host + ":" + port,
-			DBName:               database,
-			Loc:                  loc,
-			AllowNativePasswords: true,
-			ParseTime:            true,
-		},
-		DefaultStringSize:         256,   // default size for string fields
-		DisableDatetimePrecision:  true,  // disable datetime precision, which not supported before MySQL 5.6
-		DontSupportRenameIndex:    true,  // drop & create when rename index, rename index not supported before MySQL 5.7, MariaDB
-		DontSupportRenameColumn:   false, // `change` when rename column, rename column not supported before MySQL 8, MariaDB
-		SkipInitializeWithVersion: false, // auto configure based on currently MySQL version
-	}), &gorm.Config{
+	repo.db, err = gorm.Open(d, &gorm.Config{
 		Logger: logger.Default.LogMode(loglevel),
 	})
 	if err != nil {
@@ -63,3 +67,22 @@ func (repo *GormRepository) Setup(host, user, password, database, port, key, log
 
 	return migration.Migrate(repo.db, tables)
 }
+
+// dialector with custom error handling
+type dialector struct {
+	gorm.Dialector
+}
+
+var (
+	_ gorm.Dialector       = (*dialector)(nil)
+	_ gorm.ErrorTranslator = (*dialector)(nil)
+)
+
+// override Translate(err error) error
+func (d dialector) Translate(err error) error {
+	if translater, ok := d.Dialector.(gorm.ErrorTranslator); ok {
+		err = translater.Translate(err)
+	}
+
+	return defaultErrorHandling(err)
+}

From aeb97f7b35970069271efc1e5b33cfdbed4404cc Mon Sep 17 00:00:00 2001
From: ras0q <ras0q@users.noreply.github.com>
Date: Wed, 13 Sep 2023 21:04:35 +0900
Subject: [PATCH 2/2] :recycle: wrap child error

---
 infra/db/errors.go | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/infra/db/errors.go b/infra/db/errors.go
index c1b9e58e..aee4a7f7 100644
--- a/infra/db/errors.go
+++ b/infra/db/errors.go
@@ -39,17 +39,16 @@ var (
 
 // defaultErrorHandling mysql等のエラーをハンドリングする
 // テストと連携して、いい感じに変換する
-// TODO wrapして上層に伝えたい
 func defaultErrorHandling(err error) error {
 	var me *mysql.MySQLError
 	if errors.As(err, &me) {
 		switch me.Number {
 		case 1032:
-			return ErrInvalidArgs
+			return fmt.Errorf("%w: %w", ErrInvalidArgs, err)
 		case 1062:
-			return ErrDuplicateEntry
+			return fmt.Errorf("%w: %w", ErrDuplicateEntry, err)
 		case 1452:
-			return ErrRecordNotFound
+			return fmt.Errorf("%w: %w", ErrRecordNotFound, err)
 		}
 	}
 	return err