How to add async/await inside the listen events

[sdicker8]

I would like to close my database when the app closes, but can't quit figure out how to do it - here's what i've got. This compiles but panics at runtime : 'Cannot start a runtime from within a runtime. This happens because a function (like block_on) attempted to block the current thread while the thread is being used to drive asynchronous tasks.'

    .on_window_event(|event| match event.event() {
        WindowEvent::CloseRequested { api: _, .. } => {
            if let Some(db) = event.window().try_state::<Arc<Pool<Sqlite>>>() {
                //tokio::runtime::Handle::current().block_on(async {
                //tauri::async_runtime::handle().block_on(async {
                tauri::async_runtime::block_on(async {
                    db.close().await;
                })
            }
        }
        _ => {}
    })

this question was essentially asked here (but there was no final resolution):
https://users.rust-lang.org/t/how-to-add-async-await-inside-the-listen-events-in-tauri-application/78608

Any advice would be greatly appreciated - thanks -

[FabianLars]

The last messages in that thread go somewhat in the right direction. 1) It's actually quite rare that you really need tokio::main _in a tauri app. 2) if you still want to do it (which is fine btw), you need to give Tauri a handle to the tokio runtime: https://docs.rs/tauri/latest/tauri/async_runtime/fn.set.html

Edit: It gets a little weird inside the on_X_event handlers, you need to wrap the async_runtime::block_on call in tauri::task::block_in_place :/

[sdicker8]

FabianLars figured out a solution here - wrap the block_on call in tokio::task::block_in_place
This only necessary if main is an async tokio::main