How do I debug a callback that isn't getting triggered?

[timClicks]

For some reason, I can't seem to get a script's to be triggered in game. I'm also finding it impossible to identify how to fix it.

The code below produces hello from lua, but not it works!. Do you have any ideas on how to diagnose and/or fix it?

#[derive(Debug, Default, Resource)]
pub struct Scripts {
    pub inner: HashMap<i32, Handle<ScriptAsset>>,
}

pub struct ScriptingPlugin;

impl Plugin for ProgPlugin {
    fn build(&self, app: &mut App) {
        app.add_plugins((
            LuaScriptingPlugin::default(),
            ScriptFunctionsPlugin
        ));
        
        app.init_resource::<Scripts>();
        app.add_event::<ScriptCallbackEvent>();
        app.add_systems(Startup, load_scripts);
        app.add_systems(FixedUpdate, (
            trigger_scripts,
            (event_handler::<Run, LuaScriptingPlugin>).after(trigger_scripts),
        ));
        app.add_systems(bevy::app::FixedPostUpdate, debug_scripts);

        register_functions_available_to_lua(app);
    }
}

callback_labels!(
    Run => "run",
);

pub fn trigger_scripts(mut events: EventWriter<ScriptCallbackEvent>) {
    bevy::log::debug!("triggering scripts");
    events.send(ScriptCallbackEvent::new_for_all(Run, vec![]));
}

pub fn load_scripts(asset_server: Res<AssetServer>, mut scripts: ResMut<resources::MobileScripts>) {
    let script = r#"
    print("hello from lua");

    function run()
        print("it works!")
    end
    "#;
    let script = script.as_bytes().to_owned().into_boxed_slice();
    let path = "memory:://entity-name/entity-1234/1.lua";

    let asset = ScriptAsset {
        content: script.clone(),
        asset_path: AssetPath::parse(path),
    };

    let script_id = 12345;
    let handle: bevy::asset::Handle<ScriptAsset> = asset_server.add(asset);
    scripts.inner.insert(script_id, handle.clone());

    CreateOrUpdateScript::<LuaScriptingPlugin>::new(path.into(), script, None);
}

pub fn debug_scripts(events: EventReader<ScriptCallbackEvent>, mut scripts: ResMut<resources::MobileScripts>) {
    bevy::log::debug!("events missed: {}", events.len()); // Always > 0
    bevy::log::debug!("scripts loaded: {scripts:#?}");
}

[makspll]

Hi,

Quick thing first, I dont see you actually attaching the script to an entity or marking it as static, this would prevent the event handler from sending events to it.

See https://makspll.github.io/bevy_mod_scripting/Summary/running-scripts.html#attaching-scripts.

As for debugging, try running with bevy_mod_scripting_core=trace logging, this should tell you what's happening under the hood

[timClicks]

That's exactly what is wrong. Thank you!