Feat(Initial): Initial Go codebase

backend/internal/common/database.go

@@ -0,0 +1,81 @@
+package common
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+type Database struct {
+	*gorm.DB
+}
+
+var DB *gorm.DB
+
+// Opening a database and save the reference to `Database` struct.
+func InitDB() *gorm.DB {
+	host := os.Getenv("DB_HOST")
+	user := os.Getenv("DB_USER")
+	pass := os.Getenv("DB_PASS")
+	dbName := os.Getenv("DB_NAME")
+	port := os.Getenv("DB_PORT")
+
+	var sslMode string
+	if os.Getenv("DB_SSL") == "TRUE" {
+		sslMode = "enable"
+	} else {
+		sslMode = "disable"
+	}
+
+	// DB Logger config
+	newLogger := logger.New(
+		log.New(os.Stdout, "\r\n", log.LstdFlags), // io writer
+		logger.Config{
+			SlowThreshold:             time.Second,   // Slow SQL threshold
+			LogLevel:                  logger.Silent, // Log level
+			IgnoreRecordNotFoundError: true,          // Ignore ErrRecordNotFound error for logger
+			Colorful:                  true,          // Disable color
+		},
+	)
+
+	dsn := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%s sslmode=%s TimeZone=Asia/Singapore", host, user, pass, dbName, port, sslMode)
+	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
+		Logger: newLogger,
+	})
+	if err != nil {
+		fmt.Println("db err: (Init) ", err)
+	}
+	DB = db
+	return DB
+}
+
+// This function will create a temporarily database for running testing cases
+func TestDBInit() *gorm.DB {
+	testSQLDB, mock, err := sqlmock.New()
+	if err != nil {
+		panic(err)
+	}
+
+	testDB, err := gorm.Open(postgres.New(postgres.Config{
+		Conn: testSQLDB,
+	}), &gorm.Config{})
+
+	if err != nil {
+		fmt.Println("db err: (TestDBInit) ", err)
+	}
+
+	DB = testDB
+	_ = mock
+	return DB
+}
+
+// Using this function to get a connection, you can create your connection pool here.
+func GetDB() *gorm.DB {
+	return DB
+}