How can I create a dynamic App?

[cam510]

Hi, I want to create a dynamic App but have a complime error below:

type mismatch resolving <impl ServiceFactory<ServiceRequest, Response = ServiceResponse<EitherBody<EitherBody<Encoder<BoxBody>>>>, Error = actix_web::Error, Config = (), InitError = ()> as ServiceFactory<ServiceRequest>>::Response == ServiceResponse<B>
expected struct ServiceResponse<EitherBody<EitherBody<Encoder<BoxBody>>>>
found struct ServiceResponse<B>rustcE0271
main.rs(181, 13): this type parameter

I enter the warp function, it's also return the

App<
    impl ServiceFactory<
        ServiceRequest,
        Response = ServiceResponse<B>,
        Error = actix_web::Error,
        Config = (),
        InitError = (),
    >,
>

My code below:

fn init_app<B>() -> App<
    impl ServiceFactory<
        ServiceRequest,
        Response = ServiceResponse<B>,
        Error = actix_web::Error,
        Config = (),
        InitError = (),
    >,
> where B: MessageBody
{
    let init_db_url = PROJECT_CONFIGS.db_url.as_ref();
    let pg_conn = move || PgConnection::connect2(init_db_url);
    let debug_app = App::new()
        .data_factory(pg_conn)
        .wrap(middleware::Compress::default())
        .wrap(Cors::default().allow_any_origin());
    let release_app = App::new()
        .data_factory(pg_conn)
        .wrap(middleware::Compress::default());
    #[cfg(debug_assertions)]
    if cfg!(debug_assertions) {
        debug_app
    } else {
        release_app
    }
}

Thanks :)

[robjtede]

Dynamic apps are difficult for the same reason as dynamic anything is difficult in Rust.

The workaround for dynamic middleware is the Condition middleware wrapper.

[cam510]

Thanks ^_^