fix: reverted the bourbier done to DI, reflection is bad

api/dependecyInjection.go

@@ -5,52 +5,13 @@ import (
 	"GoCMS/adapters/secondary/gateways/models"
 	domainGateways "GoCMS/domain/gateways"
 	"GoCMS/useCases"
-	"fmt"
 	"os"
 	"path/filepath"
-	"reflect"
-	"runtime"
 
 	"github.com/glebarez/sqlite"
-	"go.uber.org/dig"
 	"gorm.io/gorm"
 )
 
-type UseCaseDefinition struct {
-	Constructor interface{}
-	FieldName   string
-}
-
-type RepositoryDefinition struct {
-	Constructor interface{}
-	Interface   interface{}
-}
-
-var useCaseDefinitions = []UseCaseDefinition{
-	{useCases.NewCreatePostUseCase, "CreatePostUseCase"},
-	{useCases.NewGetPostUseCase, "GetPostUseCase"},
-	{useCases.NewListPostsUseCase, "ListPostsUseCase"},
-	{useCases.NewUpdatePostUseCase, "UpdatePostUseCase"},
-	{useCases.NewDeletePostUseCase, "DeletePostUseCase"},
-	{useCases.NewGetUserUseCase, "GetUserUseCase"},
-	{useCases.NewCreateUserUseCase, "CreateUserUseCase"},
-	{useCases.NewUpdateUserUseCase, "UpdateUserUseCase"},
-	{useCases.NewDeleteUserUseCase, "DeleteUserUseCase"},
-	{useCases.NewListUsersUseCase, "ListUsersUseCase"},
-	{useCases.NewGetPageUseCase, "GetPageUseCase"},
-	{useCases.NewSendMailUseCase, "SendMailUseCase"},
-	{useCases.NewCreateImageUseCase, "CreateImageUseCase"},
-	{useCases.NewDeleteImageUseCase, "DeleteImageUseCase"},
-}
-
-var repositoryDefinitions = []RepositoryDefinition{
-	{gateways.NewPostRepository, new(domainGateways.IPostRepository)},
-	{gateways.NewUserRepository, new(domainGateways.IUserRepository)},
-	{gateways.NewImageRepository, new(domainGateways.IImageRepository)},
-	{gateways.NewMailRepository, new(domainGateways.IMailRepository)},
-	{gateways.NewPageRepository, new(domainGateways.IPageRepository)},
-}
-
 type UseCases struct {
 	CreatePostUseCase  *useCases.CreatePostUseCase
 	GetPostUseCase     *useCases.GetPostUseCase
@@ -68,6 +29,14 @@ type UseCases struct {
 	DeleteImageUseCase *useCases.DeleteImageUseCase
 }
 
+type Repositories struct {
+	PostRepo  domainGateways.IPostRepository
+	UserRepo  domainGateways.IUserRepository
+	ImageRepo domainGateways.IImageRepository
+	MailRepo  domainGateways.IMailRepository
+	PageRepo  domainGateways.IPageRepository
+}
+
 var Container *UseCases
 
 func getDb() *gorm.DB {
@@ -79,75 +48,45 @@ func getDb() *gorm.DB {
 	if err != nil {
 		panic("Unable to open the database: " + err.Error())
 	}
-	return db
-}
 
-func InitContainer() {
+	if err := db.AutoMigrate(&models.Post{}, &models.User{}); err != nil {
-	digContainer := dig.New()
-
-	database := getDb()
-	if err := database.AutoMigrate(&models.Post{}, &models.User{}); err != nil {
 		panic("Failed to migrate database: " + err.Error())
 	}
 
-	if err := digContainer.Provide(func() *gorm.DB { return database }); err != nil {
+	return db
-		panic("Failed to provide database: " + err.Error())
 }
 
-	provideRepositories(digContainer)
+func initRepositories(db *gorm.DB) *Repositories {
-
+	return &Repositories{
-	for _, def := range useCaseDefinitions {
+		PostRepo:  gateways.NewPostRepository(db),
-		if err := digContainer.Provide(def.Constructor); err != nil {
+		UserRepo:  gateways.NewUserRepository(db),
-			funcName := runtime.FuncForPC(reflect.ValueOf(def.Constructor).Pointer()).Name()
+		ImageRepo: gateways.NewImageRepository(db),
-			panic(fmt.Sprintf("Failed to provide %s: %v", funcName, err))
+		MailRepo:  gateways.NewMailRepository(),
+		PageRepo:  gateways.NewPageRepository(),
 	}
 }
 
-	constructorType := buildConstructorType()
+func initUseCases(repos *Repositories) *UseCases {
-	constructor := reflect.MakeFunc(constructorType, buildUseCasesInstance)
+	return &UseCases{
-
+		CreatePostUseCase:  useCases.NewCreatePostUseCase(repos.PostRepo),
-	if err := digContainer.Provide(constructor.Interface()); err != nil {
+		GetPostUseCase:     useCases.NewGetPostUseCase(repos.PostRepo),
-		panic("Failed to provide container constructor: " + err.Error())
+		ListPostsUseCase:   useCases.NewListPostsUseCase(repos.PostRepo),
-	}
+		UpdatePostUseCase:  useCases.NewUpdatePostUseCase(repos.PostRepo),
-
+		DeletePostUseCase:  useCases.NewDeletePostUseCase(repos.PostRepo),
-	if err := digContainer.Invoke(func(useCases *UseCases) { Container = useCases }); err != nil {
+		GetUserUseCase:     useCases.NewGetUserUseCase(repos.UserRepo),
-		panic("Unable to invoke container: " + err.Error())
+		CreateUserUseCase:  useCases.NewCreateUserUseCase(repos.UserRepo),
+		UpdateUserUseCase:  useCases.NewUpdateUserUseCase(repos.UserRepo),
+		DeleteUserUseCase:  useCases.NewDeleteUserUseCase(repos.UserRepo),
+		ListUsersUseCase:   useCases.NewListUsersUseCase(repos.UserRepo),
+		GetPageUseCase:     useCases.NewGetPageUseCase(repos.PageRepo),
+		SendMailUseCase:    useCases.NewSendMailUseCase(repos.MailRepo),
+		CreateImageUseCase: useCases.NewCreateImageUseCase(repos.ImageRepo),
+		DeleteImageUseCase: useCases.NewDeleteImageUseCase(repos.ImageRepo),
 	}
 }
 
-func buildConstructorType() reflect.Type {
+func InitContainer() {
-	var paramTypes []reflect.Type
+	db := getDb()
-	for _, def := range useCaseDefinitions {
+	repos := initRepositories(db)
-		constructorType := reflect.TypeOf(def.Constructor)
+	Container = initUseCases(repos)
-		returnType := constructorType.Out(0)
-		paramTypes = append(paramTypes, returnType)
-	}
-
-	return reflect.FuncOf(paramTypes, []reflect.Type{reflect.TypeOf(&UseCases{})}, false)
-}
-
-func buildUseCasesInstance(args []reflect.Value) []reflect.Value {
-	container := &UseCases{}
-	containerValue := reflect.ValueOf(container).Elem()
-
-	for i, arg := range args {
-		fieldName := useCaseDefinitions[i].FieldName
-		field := containerValue.FieldByName(fieldName)
-		if field.IsValid() && field.CanSet() {
-			field.Set(arg)
-		} else {
-			panic(fmt.Sprintf("Failed to set field %s", fieldName))
-		}
-	}
-
-	return []reflect.Value{reflect.ValueOf(container)}
-}
-
-func provideRepositories(container *dig.Container) {
-	for _, def := range repositoryDefinitions {
-		if err := container.Provide(def.Constructor, dig.As(def.Interface)); err != nil {
-			funcName := runtime.FuncForPC(reflect.ValueOf(def.Constructor).Pointer()).Name()
-			panic(fmt.Sprintf("Failed to provide repository %s: %v", funcName, err))
-		}
-	}
 }