fix(initialize): move config to domain

cmd/app-1/main.go

@@ -2,12 +2,11 @@ package main
 
 import (
 	"log"
-	"os"
+	"ui.ac.id/dtd/go-webserver-boilerplate/internal/domain"
 
 	"github.com/gofiber/fiber/v3"
 	"github.com/gofiber/fiber/v3/middleware/healthcheck"
 	"github.com/gofiber/fiber/v3/middleware/logger"
-	"github.com/joho/godotenv"
 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
 	"ui.ac.id/dtd/go-webserver-boilerplate/internal/handler"
@@ -15,49 +14,12 @@ import (
 	"ui.ac.id/dtd/go-webserver-boilerplate/internal/service"
 )
 
-type Config struct {
-	DatabaseUrl    string
-	AppEnvironment string
-	Port           string
-}
-
-func initConfig() Config {
-	environment := os.Getenv("APP_ENVIRONMENT")
-
-	if environment == "" {
-		environment = "production"
-	}
-
-	if environment == "development" {
-		err := godotenv.Load()
-
-		if err != nil {
-			panic(err)
-		}
-	}
-
-	port := os.Getenv("PORT")
-
-	if port == "" {
-		port = "8000"
-	}
-
-	log.Printf("Environment: %s", environment)
-
-	return Config{
-		DatabaseUrl:    os.Getenv("DATABASE_URL"),
-		AppEnvironment: environment,
-		Port:           port,
-	}
-}
-
 func main() {
-	config := initConfig()
+	config := domain.InitConfig()
 	db, err := gorm.Open(postgres.Open(config.DatabaseUrl), &gorm.Config{})
 
 	if err != nil {
 		log.Fatal(err)
-		os.Exit(1)
 	}
 
 	userRepository := postgresql.NewPostgresUserRepository(db)
@@ -82,5 +44,9 @@ func main() {
 	user.Get("/:id", userHandler.GetUserDetail)
 	user.Get("/", userHandler.GetUserList)
 
-	app.Listen(":" + config.Port)
+	err = app.Listen(":" + config.Port)
+
+	if err != nil {
+		return
+	}
 }

internal/domain/config.go

+package domain
+
+import (
+	"github.com/joho/godotenv"
+	"log"
+	"os"
+)
+
+type Config struct {
+	DatabaseUrl    string
+	AppEnvironment string
+	Port           string
+}
+
+func InitConfig() Config {
+	environment := os.Getenv("APP_ENVIRONMENT")
+
+	if environment == "" {
+		environment = "production"
+	}
+
+	if environment == "development" {
+		err := godotenv.Load()
+
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	port := os.Getenv("PORT")
+
+	if port == "" {
+		port = "8000"
+	}
+
+	log.Printf("Environment: %s", environment)
+
+	return Config{
+		DatabaseUrl:    os.Getenv("DATABASE_URL"),
+		AppEnvironment: environment,
+		Port:           port,
+	}
+}

internal/handler/error.go

 package handler
 
 import (
+	"errors"
 	"github.com/gofiber/fiber/v3"
 	"ui.ac.id/dtd/go-webserver-boilerplate/internal/domain" // Adjust import path to your project
 )
@@ -34,7 +35,8 @@ func ErrorHandler(ctx fiber.Ctx, err error) error {
 }
 
 func formatError(err error) ErrorResponse {
-	if customErr, ok := err.(*domain.Error); ok {
+	var customErr *domain.Error
+	if errors.As(err, &customErr) {
 		errResp := ErrorResponse{
 			Message: customErr.Message,
 		}