func newApp()

in main.go [74:112]
32 lines of code
4 McCabe index (conditional complexity)

func newApp(ctx context.Context, port, projectID string) (*App, error) {
	app := &App{
		Server: &http.Server{
			Addr: ":" + port,
			// Add some defaults, should be changed to suit your use case.
			ReadTimeout:    10 * time.Second,
			WriteTimeout:   10 * time.Second,
			MaxHeaderBytes: 1 << 20,
		},
	}

	if projectID == "" {
		projID, err := metadata.ProjectID()
		if err != nil {
			return nil, fmt.Errorf("unable to detect Project ID from GOOGLE_CLOUD_PROJECT or metadata server: %w", err)
		}
		projectID = projID
	}
	app.projectID = projectID

	client, err := logging.NewClient(ctx, fmt.Sprintf("projects/%s", app.projectID),
		// We don't need to make any requests when logging to stderr.
		option.WithoutAuthentication(),
		option.WithGRPCDialOption(
			grpc.WithTransportCredentials(insecure.NewCredentials()),
		))
	if err != nil {
		return nil, fmt.Errorf("unable to initialize logging client: %v", err)
	}
	app.log = client.Logger("test-log", logging.RedirectAsJSON(os.Stderr))

	// Setup request router.
	r := mux.NewRouter()
	r.HandleFunc("/", app.Handler).
		Methods("GET")
	app.Server.Handler = r

	return app, nil
}