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close #34

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Summary of Changes

Hello @Mikens404, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request establishes the foundational HTTP server setup for the application, transitioning the project from a placeholder 'Hello world' to a functional server. It integrates core application components by initializing train and reservation services along with their respective repositories. The changes define the main entry point for the application, preparing it to handle incoming requests by properly wiring up all necessary dependencies.

Highlights

  • Server Initialization: The main.go file has been completely refactored to initialize and start an HTTP server, moving from a simple 'Hello world!' output to a functional server listening on port 8080.
  • Dependency Wiring: Core application components, including TrainRepository, ReservationRepository, TrainService, and ReservationService, are now instantiated and wired together in main.go to build the application's operational structure.
  • Handler Updates: The presentation.Handler now includes TrainService as a dependency, ensuring it has access to train-related business logic when handling requests.
  • Code Refinements: Minor adjustments were made, such as removing a trailing comma in NewTrainService and changing the FindTrainInfo method receiver in train_repository.go from a pointer to a value type.

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Code Review

このプルリクエストは、HTTPサーバーをセットアップするための変更ですね。全体的に、依存関係の注入(DI)が適切に行われており、サーバーの起動ロジックが実装されていることを確認しました。

いくつか改善のための提案があります。

  • main.goにおいて、init()関数とグローバル変数の使用を避け、main関数内でサーバーのセットアップを完結させることで、よりテストしやすく、見通しの良いコードにするためのリファクタリングを提案します。
  • internal/infrastructure/train_repository.goのレシーバーの型について、一貫性を保つための提案をしています。
  • main.go内の不要なコメントについても指摘しています。

詳細は各コメントをご確認ください。

Comment on lines +27 to 40
func init() {
s, err := BuildServer()
if err != nil {
log.Fatal(err)
}
server = s
}

func main() {
fmt.Print("Hello world!")
slog.Info("hello.")
if err := http.ListenAndServe(":8080", server); err != nil {
log.Fatal(err)
}
}
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high

init()関数とグローバル変数 server を使ってサーバーを初期化する実装になっていますが、この方法はテストのしにくさや、グローバルな状態がコードの可読性を下げる原因となる可能性があります。

main関数内でサーバーのビルドから起動までを完結させることをお勧めします。

  1. 13行目のグローバル変数 var server http.Handler を削除します。
  2. 以下の提案のように init() 関数を削除し、main() 関数を修正します。

これにより、main関数がプログラムのエントリーポイントとして全ての初期化ロジックを管理するようになり、コードの流れが追いやすくなります。

func main() {
	slog.Info("Starting server...")
	server, err := BuildServer()
	if err != nil {
		log.Fatalf("failed to build server: %v", err)
	}

	slog.Info("Server is listening on :8080")
	if err := http.ListenAndServe(":8080", server); err != nil {
		log.Fatalf("failed to listen and serve: %v", err)
	}
}

}

func (t *trainRepositoryImpl) FindTrainInfo(ctx context.Context, trainNumber int) (domain.Train, error) {
func (t trainRepositoryImpl) FindTrainInfo(ctx context.Context, trainNumber int) (domain.Train, error) {
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medium

FindTrainInfoメソッドのレシーバーが値レシーバー (trainRepositoryImpl) に変更されていますね。trainRepositoryImplは空の構造体なので、値レシーバーでも動作します。
しかし、NewTrainRepository関数がポインタ (*trainRepositoryImpl) を返しているため、一貫性の観点からポインタレシーバー (*trainRepositoryImpl) を使用することが推奨されます。将来的にこの構造体にフィールドが追加された場合にも、意図しないコピーを防ぐことができます。

Suggested change
func (t trainRepositoryImpl) FindTrainInfo(ctx context.Context, trainNumber int) (domain.Train, error) {
func (t *trainRepositoryImpl) FindTrainInfo(ctx context.Context, trainNumber int) (domain.Train, error) {

var server http.Handler

func BuildServer() (*presentation.Server, error) {
//reservation_epository
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medium

このコメントにはタイポ (reservation_epository) があります。また、直後のコードでリポジトリを生成しているため、このコメントは不要かと思われます。削除をご検討ください。

@Mikens404
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間違えてブランチ立てちゃったよ

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サーバーを起動できるようにする

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