Using the Handler trait as part of another trait | How to colocate config next to handler fn

[enricoschaaf]

Summary

Hi 👋🏽

I am new to Axum and Rust and I am wondering how you would handle the following.

I would like to colocate some information for a certain handler with the handler fn itself. Like the path, rate limiting settings, etc. For this I imagined I could do it like this

pub trait HandlerWithContext {
    fn rate_limit() -> SomeRateLimit;

    fn path() -> String;

    fn handler();
}

but since Handler is a trait not a fn I am not sure how to add it to my trait. I tried to use a function that returns the trait but I also did not get this to work bc of this error the trait "axum::handler::Handler" cannot be made into an object

use axum::handler::Handler;

pub trait HandlerWithContext {
    fn rate_limit() -> SomeRateLimit;

    fn path() -> String;

    fn handler<T, S>() -> Handler<T, S>;
}

Looking forward to hear how I could fix my approach or if there are any better approaches on how to handle this. Btw for registering the route I would have made a light wrapper around router that has a method that accepts my trait and correctly handles all the info that the trait provided.

Thanks 🙏🏽

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