Using a closure in middleware::from_fn #2053

gubsey · 2023-06-20T21:22:23Z

gubsey
Jun 20, 2023

Is it possible to use a closure in middleware::from_fn?

Here is a very basic example of what I am trying to accomplish. I know I could just create a function but the idea is this is something that would be repeated many times, and I don't want to have to create 30+ functions

#[tokio::main]
async fn main() {
    let app = Router::new()
        .route("/", get(|| async { "tyler" }))
        .route_layer(middleware::from_fn(|r, n| async { layer(r, n, "tyler") }));

    axum::Server::bind(&"0.0.0.0:8080".parse().unwrap())
        .serve(app.into_make_service())
        .await
        .unwrap();
}

async fn layer(req: Request<Body>, next: Next<Body>, cnd: &str) -> Result<Response, StatusCode> {
    if cnd == "tyler" {
        Ok(next.run(req).await)
    } else {
        Err(StatusCode::IM_A_TEAPOT)
    }
}

gubsey · 2023-06-20T21:25:21Z

gubsey
Jun 20, 2023
Author

I figured it out immediately and don't know how to delete it. For future needs, I just needed to remove the async part of the closure:

middleware::from_fn(|r, n| layer(r, n, "tyler"))

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Using a closure in middleware::from_fn #2053

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gubsey Jun 20, 2023

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gubsey Jun 20, 2023 Author

gubsey
Jun 20, 2023

gubsey
Jun 20, 2023
Author