golang webapp package structure [duplicate]

Question

I've a simple golang web application, everything in main package, where http handlers are methods of an App struct embedding a DB pointer

type App struct {
    DB *sqlx.DB
}

func (app *App) Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    // i can use app.DB here       
}

router.GET("/api/v1/index", app.Index)

Now i need to add other methods, and i was thinking to use packages to keep the code clean.

in main package

type App struct {
    DB *sqlx.DB
    V2 NewPackage.App
}

in Newpackage package

type App struct{}

func (app *App) Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {

   // how can i use DB here?

}

router.GET("/api/v2/index", app.V2.Index)

Question: how i can use App.DB in Newpackage?