fix: cap mysql connection pool

internal/store/mysql.go

@@ -58,7 +58,7 @@ func SetUIDKey(encoded string) error {
 }
 
 func Open(cfg config.MySQLConfig) (*Store, error) {
-	st, err := openDSN(cfg.DSN)
+	st, err := openDSN(cfg)
 	if err != nil {
 		return nil, err
 	}
@@ -66,13 +66,13 @@ func Open(cfg config.MySQLConfig) (*Store, error) {
 	return st, nil
 }
 
-func openDSN(dsn string) (*Store, error) {
-	db, err := sqlx.Open("mysql", dsn)
+func openDSN(cfg config.MySQLConfig) (*Store, error) {
+	db, err := sqlx.Open("mysql", cfg.DSN)
 	if err != nil {
 		return nil, err
 	}
-	db.SetMaxOpenConns(30)
-	db.SetMaxIdleConns(10)
+	db.SetMaxOpenConns(cfg.MaxOpenConns)
+	db.SetMaxIdleConns(cfg.MaxIdleConns)
 	db.SetConnMaxLifetime(30 * time.Minute)
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
@@ -80,7 +80,7 @@ func openDSN(dsn string) (*Store, error) {
 		_ = db.Close()
 		return nil, err
 	}
-	return &Store{db: db, dsn: dsn}, nil
+	return &Store{db: db, dsn: cfg.DSN}, nil
 }
 
 func (s *Store) tenant() int64 {