wasmtime / issue #9331 Error "<unknown>! wasm function 23... · git-wasmtime

I am experimenting with a wasmtime powered plugin system.

So far everything works like a charm. Thanks a bunch for your awesome work!

I am using the component model, wasmtime-wasi in an async fashion!

Now inside a plugin/component I do this:

impl OnRequestGuest for Component {
    fn onwsrequest(msg: String) {
        print(NAME, &format!("A received a message from host: {msg}"));
        //publish("thanks_for_watching");
    }

    fn onrequest(req: Request) -> Response {
        let Request {
            head: Parts { uri, method, .. },
            ..
        } = req;

        let h1 = format!("Thanks for your call to {uri} via {method}!");
        let html = leptos::ssr::render_to_string(move || {
            view! {
                <h1>{h1}</h1>
                <p>"This site was built with leptos and love!"</p>
            }
        });
        let root = build_response(
            uri.clone(),
            method.clone(),
            vec![],
            html.as_bytes().to_vec(),
        );

        let html = leptos::ssr::render_to_string(move || {
            view! {
                <h1>Welcome to Ladida!</h1>
                <p>Here, the future is forged!</p>
            }
        });
        let ladida = build_response(uri.clone(), method, vec![], html.as_bytes().to_vec());

        let mut router = matchit::Router::new();
        //router.insert("/", root).unwrap();
        router.insert("/ladida", ladida).unwrap();
        //
        //router.at(&uri).unwrap().value.clone();
        root
    }
}

As soon as I enable the line:

router.at(&uri).unwrap().value.clone();

it fails with

2024-09-29T22:32:43.061351Z ERROR simple_host::pluginsystem::routes: An error occurred during the onrequest call for plugin@".../compiled_plugins_folder/my_plugin.wasm": error while executing at wasm backtrace:
    0: 0x1450c - <unknown>!<wasm function 231>
    1: 0x13a02 - <unknown>!<wasm function 208>
    2: 0x14b6f - <unknown>!<wasm function 238>
    3: 0x14ae0 - <unknown>!<wasm function 237>
    4: 0xda0e - <unknown>!<wasm function 123>
    5: 0xcc83 - <unknown>!<wasm function 100>
    6: 0x4b7c - <unknown>!<wasm function 68>
    7: 0x96c0 - <unknown>!<wasm function 86>
 ```

**when the host and my usage of wasmtime was still `sync` I got another error, saying something like `Cannot instantiate new runtime while in runtime` (usage like `block_on` not allowed) or something along these lines.**

Can you explain the error and what I can do to circumvent it?

Thank you very much!
~~~

Stream: git-wasmtime

Topic: wasmtime / issue #9331 Error "<unknown>! wasm function 23...

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