remake in Golang

api/db/main.go

@@ -0,0 +1,46 @@
+package db
+
+import (
+	"database/sql"
+	"sync"
+
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/spf13/viper"
+)
+
+var ActiveDB *sql.DB
+var lock = new(sync.Mutex)
+
+func GetDB() (*sql.DB, error) {
+
+	if ActiveDB != nil {
+		return ActiveDB, nil
+	}
+
+	db, err := ConnectDB()
+	if err != nil {
+		return nil, err
+	}
+
+	ActiveDB = db
+	return db, nil
+}
+
+func ConnectDB() (*sql.DB, error) {
+	lock.Lock()
+	defer lock.Unlock()
+
+	if ActiveDB != nil {
+		ActiveDB.Close()
+		ActiveDB = nil
+	}
+
+	cfg := viper.GetViper()
+	db, err := sql.Open("mysql", cfg.GetString("MARIADB_CONNSTRING"))
+	if err != nil {
+		return nil, err
+	}
+
+	ActiveDB = db
+	return db, nil
+}