Running async code from a ServiceConfig function

[Cakeday]

Is there a way to call asynchronous code from a service config function?

It almost seems like a 1-to-1 use case compared to invoking the app, except the main function is async.

Run external configuration as part of the scope building process.

This function is useful for moving parts of configuration to a different module or library. For example, some of the resource's configuration could be moved to different module.

use actix_web::{web, middleware, App, HttpResponse};

// this function could be located in different module
fn config(cfg: &mut web::ServiceConfig) {
    cfg.service(web::resource("/test")
        .route(web::get().to(|| HttpResponse::Ok()))
        .route(web::head().to(|| HttpResponse::MethodNotAllowed()))
    );
}

let app = App::new()
    .wrap(middleware::Logger::default())
    .service(
        web::scope("/api")
            .configure(config)
    )
    .route("/index.html", web::get().to(|| HttpResponse::Ok()));

I would love to do something like this:

use actix_web::{web, middleware, App, HttpResponse};

// this function could be located in different module
async fn config(cfg: &mut web::ServiceConfig) {

    let some_async_value = some_async_function().await;

    cfg.service(web::resource("/test")
        .route(web::get().to(|| HttpResponse::Ok()))
        .route(web::head().to(|| HttpResponse::MethodNotAllowed()))
    );
}

let app = App::new()
    .wrap(middleware::Logger::default())
    .service(
        web::scope("/api")
            .configure(config)
    )
    .route("/index.html", web::get().to(|| HttpResponse::Ok()));