Really long type of ServiceBuilder

[dulguun0225]

I wanted to put creation of layers into one function and pass it to Router::layer. But I can't figure out what the return type should be.

VSCode tells me that type of let builder: is ServiceBuilder<Stack<TimeoutLayer, Stack<HandleErrorLayer<fn handle_timeout_error(Box<dyn Error + Send + Sync>) -> impl Future<Output = (StatusCode, String)>, {unknown}>, Stack<CompressionLayer, Stack<TraceLayer<SharedClassifier<ServerErrorsAsFailures>>, Identity>>>>>

But I'm guessing it should be something simpler on the return type.

pub fn new() -> ??????????????? {
    let builder = ServiceBuilder::new()
        .layer(TraceLayer::new_for_http())
        .layer(CompressionLayer::new())
        .layer(HandleErrorLayer::new(handle_timeout_error))
        .timeout(Duration::from_secs(30));

    builder
}

[davidpdrsn]

That's just how tower works. Nothing axum do about that.

I general I recommend writing

fn apply_middleware(router: Router) -> Router {
    ...
}

instead.