closing tui no longer crashes + onShutdown event

src/server/plugins/backend_lua.rs

@@ -137,6 +137,7 @@ impl Backend for BackendLua {
     fn call_event_handler(&mut self, event: ScriptEvent, resp: Option<oneshot::Sender<Argument>>) {
         let (event_name, args) = match event {
             ScriptEvent::OnPluginLoaded => ("onInit", vec![]),
+            ScriptEvent::OnShutdown => ("onShutdown", vec![]),
             ScriptEvent::OnPlayerAuthenticated { name, role, is_guest, identifiers } => ("onPlayerAuth", vec![Argument::String(name), Argument::String(role), Argument::Boolean(is_guest), Argument::Table(identifiers.to_map())]),
             ScriptEvent::OnPlayerDisconnect { pid, name } => ("onPlayerDisconnect", vec![Argument::Number(pid as f32), Argument::String(name)]),
         };

src/server/plugins/mod.rs

@@ -45,6 +45,7 @@ impl PlayerIdentifiers {
 #[derive(Debug)]
 pub enum ScriptEvent {
     OnPluginLoaded,
+    OnShutdown,
 
     OnPlayerAuthenticated { name: String, role: String, is_guest: bool, identifiers: PlayerIdentifiers },
 
@@ -114,6 +115,13 @@ impl Plugin {
         })
     }
 
+    pub async fn close(mut self) {
+        let (tx, mut rx) = oneshot::channel();
+        self.send_event(PluginBoundPluginEvent::CallEventHandler((ScriptEvent::OnShutdown, Some(tx)))).await;
+        let _ = rx.await; // We just wait for it to finish shutting down
+        self.runtime.shutdown_background();
+    }
+
     // TODO: For performance I think we can turn this into an iterator instead of first allocating
     //       a full vector?
     pub fn get_events(&mut self) -> Vec<ServerBoundPluginEvent> {