Bump in handler

[7086cmd]

Summary

I need to use a Bump, an arena allocator, to execute a map-based logic to boost the execution speed in the API service. However, the Bump doesn't implement the Sync trait. It reports an error every time, EVEN IF I TRIED TO RUN THEM IN ONE THREAD (via tokio::task::LocalSet) — the formation of the allocator and the drop are all in the run_until. What's going on?

    let result = local.run_until(async {
        match route_merchant(from.unwrap().as_str(), to.unwrap().as_str(), entity.as_str(), limits, &state.db).await {
            Ok(instructions) => {
                let instructions = instructions.clone();
                let json = json!({ "instructions": instructions });
                (StatusCode::OK, axum::Json(json))
            }
            Err(e) => (StatusCode::BAD_REQUEST, axum::Json(json!({"error": e}))),
        }
    }).await;
    
pub async fn route_merchant(departure_merchant: &str, arrival_merchant: &str, entity_id: &str, limits: ConnectivityLimits, db: &Database) -> Result<Vec<InstructionType>, NavigationError> {
    let alloc = Bump::default();
// Some logics
    entity.navigate(src, dest, limits, &alloc)
}

axum version

0.8.6

[mladedav]

It's hard to say anything with this little information. What's the error?

[7086cmd]

It seems that the Bump doesn't implement Send + Sync, so it can't serve as the handler in this scenario. Simply use block_on to execute logic that requires Bump instead.