Lifetime cannot outlive the anonymous lifetime #1

[wangjia184]

impl ChunkedStreamingShuttle {


    pub fn get_service(&self) -> Resource {
        web::resource("/")
            .route(web::get().to(move |req| { self.outbound(req) })) // <--- #1
    }

    fn outbound(&self, req: HttpRequest) -> impl Responder {
        // ...
    }

}

I understand self's lifetime is not available within anonymous function. But I need outbound to be fired later.

Please how can I solve this issue?

[OptimisticPeach]

Perhaps the following? impl items are usually elided to be 'static:

fn outbound<'a>(&'a self, req: HttpRequest) -> impl Responder + 'a {
    // ...
}

[wangjia184]

Thanks, but it does not work, same error.
As I understand, when outbound is being fired, self is not in that scope. Fixing the life time of return value might not work.

[OptimisticPeach]

Could you point me in the direction of the name of the library you're using?

[wangjia184]

actix-web actix = "0.8.3"

If I change self to 'static, it solves the compliation error. But get_service cannot be easily called.

pub fn get_service(&'static self) -> Resource {
        web::resource("/")
            .route(web::get().to(move |req| { self.outbound(req) })) // <--- #1
    }

[OptimisticPeach]

Ah, okay. Here's essentially what's happening:

web::resource returns a Resource, which we can then .route with a Route. We get the Route from web::get and then call .to on it. The problem occurs because of the signature of .to:

pub fn to<F, T, R>(self, handler: F) -> Route
where 
    F: Factory<T, R> + 'static,
    T: FromRequest + 'static,
    R: Responder + 'static,

Therefore the error occurs because we try to essentially do the following:

pub fn get_service<'a>(&'a self) -> Resource {
    web::resource("/")
        .route(
            web::get().to::<[closure @ source.rs] + 'a, _, _>( move ... ))
        )
}

Which doesn't work, because the closure we pass in (Which I called [closure @ source.rs] + 'a in the simplification above) is not 'static like it is specified.

Unfortunately that's about as far as I can take from the docs without reading into actix-web examples and other similar issues.