How to separate passing of App closure instance to HttpServer?

[amber-m-o-r-e]

I tried the following code to do app separation logic

fn routes() -> impl Fn() -> actix_web::app::App<actix_web::app_service::AppEntry, actix_http::actix_http::Body> {
    || {
        let app = App::new()
            .route("/", web::get().to(greet))
            .route("/{name}", web::get().to(greet));

        return app;
    }
}

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(routes())
    .bind("127.0.0.1:8088")?
    .run()
    .await
}

But with this compiler is giving me errors-

  Compiling main-example v1.0.0 (/home/bob/code/rust/hello_world)
error[E0433]: failed to resolve: use of undeclared type or module `actix_http`
  --> src/main.rs:17:83
   |
17 | fn routes() -> impl Fn() -> actix_web::app::App<actix_web::app_service::AppEntry, actix_http::actix_http::Body> {
   |                                                                                   ^^^^^^^^^^ use of undeclared type or module `actix_http`

error[E0603]: module `app` is private
  --> src/main.rs:17:40
   |
17 | fn routes() -> impl Fn() -> actix_web::app::App<actix_web::app_service::AppEntry, actix_http::actix_http::Body> {
   |                                        ^^^ this module is private
   |
note: the module `app` is defined here
  --> /home/bob/.cargo/registry/src/github.com-1ecc6299db9ec823/actix-web-2.0.0/src/lib.rs:81:1
   |
81 | mod app;
   | ^^^^^^^^

error[E0603]: module `app_service` is private
  --> src/main.rs:17:60
   |
17 | fn routes() -> impl Fn() -> actix_web::app::App<actix_web::app_service::AppEntry, actix_http::actix_http::Body> {
   |                                                            ^^^^^^^^^^^ this module is private
   |
note: the module `app_service` is defined here
  --> /home/bob/.cargo/registry/src/github.com-1ecc6299db9ec823/actix-web-2.0.0/src/lib.rs:82:1
   |
82 | mod app_service;
   | ^^^^^^^^^^^^^^^^

error[E0277]: the trait bound `impl std::ops::Fn<()>: std::clone::Clone` is not satisfied
  --> src/main.rs:29:21
   |
29 |     HttpServer::new(routes())
   |                     ^^^^^^^^ the trait `std::clone::Clone` is not implemented for `impl std::ops::Fn<()>`
   |
   = note: required by `actix_web::server::HttpServer::<F, I, S, B>::new`

error[E0277]: the trait bound `impl std::ops::Fn<()>: std::clone::Clone` is not satisfied
  --> src/main.rs:29:5
   |
29 |     HttpServer::new(routes())
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::clone::Clone` is not implemented for `impl std::ops::Fn<()>`
   |
   = note: required by `actix_web::server::HttpServer`

So how can I do separation of routes list from the server declaration?

[robjtede]

There is a .configure method on most routing table structs that can delegate to a function for setting up (sub)routes.

See docs at the bottom of this page https://actix.rs/docs/application/

[amber-m-o-r-e]

Thanks, it does the job.