Custom Handlers

[m1212e]

Hi,
following https://viz.rs/docs/0.4.x/concepts/handler I want to implement a custom handler.
The idea is to allow runtime registration of handlers. Therefore I got a map with handlers which I need to access.

#[derive(Clone)]
struct Handler {
  /**
   * Request handlers for incoming requests to this server
   */
  handlers: Arc<tokio::sync::RwLock<HashMap<String, HandlerFunction>>>,
}

impl viz::Handler<Request> for Handler {
  type Output = viz::Result<Response>;

  async fn call(&self, req: Request) -> Self::Output {
      let path = req.path().clone();
      let method = req.method().clone();
      let count = self.count.fetch_add(1, Ordering::SeqCst);
      Ok(format!("method = {method}, path = {path}, count = {count}").into_response())
  }
}

But I get this error:

functions in traits cannot be declared `async`
`async` trait functions are not currently supported
consider using the `async-trait` crate: https://crates.io/crates/async-trait
see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information

So how would I do something like this?

[fundon]

Currently, AFIT is not stable, check here. So we cant do that.

Use async-trait crate to helping us.

#[derive(Clone)]
struct Handler {
  /**
   * Request handlers for incoming requests to this server
   */
  handlers: Arc<tokio::sync::RwLock<HashMap<String, HandlerFunction>>>,
}

#[async_trait::async_trait]
impl viz::Handler<Request> for Handler {
  type Output = viz::Result<Response>;

  async fn call(&self, req: Request) -> Self::Output {
      let path = req.path().clone();
      let method = req.method().clone();
      let count = self.count.fetch_add(1, Ordering::SeqCst);
      Ok(format!("method = {method}, path = {path}, count = {count}").into_response())
  }
}

Sorry, I forgot to add it in the documentation, I'll fix it. Thanks.

[fundon]

Fixed. The docs have updated.