How to use multiple extensions or extension tuple?

[Umenokin]

Hi folks,

I am trying:

// Routing
.layer(Extension(Arc::new(worker)))
.layer(Extension(Arc::new(state)));

// Handler
async fn handler<B>(
    req: Request<B>,
    Extension(worker): Extension<Arc<Worker>>,
    Extension(state): Extension<Arc<State>>,
) -> Html<Vec<u8>>
where
    B: HttpBody + Send + 'static
{
    worker.handler(state, RequestParts::new(req)).await.unwrap()
}

And getting:

Missing request extension: Extension of type `alloc::sync::Arc<worker::Worker>` was not found. Perhaps you forgot to add it? See `axum::Extension`.

or

// Routing
.layer(Extension((Arc::new(worker), Arc::new(state))));

// Handler
async fn handler<B>(
    req: Request<B>,
    Extension((worker, state)): Extension<(Arc<Worker>, Arc<State>)>
) -> Html<Vec<u8>>
where
    B: HttpBody + Send + 'static
{
    worker.handler(state, RequestParts::new(req)).await.unwrap()
}

And getting:

Missing request extension: Extension of type `(alloc::sync::Arc<worker::Worker>, alloc::sync::Arc<state::State>)` was not found. Perhaps you forgot to add it? See `axum::Extension`.

What would be the recommended way to work with multiple sharable states?

Thanks!

[Umenokin]

I have another issue that I need to sort out to be confident, but it seems it is a requirement for Extension's be used before extractors, correct? The one below is working:

async fn handler<B>(
    Extension(worker): Extension<Arc<Worker>>,
    Extension(state): Extension<Arc<State>>,
    req: Request<B>
) -> Html<Vec<u8>>

[jplatte]

https://docs.rs/axum/latest/axum/extract/index.html#be-careful-when-extracting-request

[Umenokin]

Thanks, @jplatte for the details!