Optimize graph relation filtering and fix concurrent connection storms

nvim-core/src/lib.rs

@@ -126,12 +126,10 @@ pub struct NvimRequest {
 static NVIM_CONN: LazyLock<Arc<Mutex<Option<mpsc::Sender<NvimRequest>>>>> = LazyLock::new(|| Arc::new(Mutex::new(None)));
 
 async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
-    {
-        let conn_lock = NVIM_CONN.lock().await;
-        if let Some(sender) = conn_lock.as_ref() {
-            if !sender.is_closed() {
-                return Ok(sender.clone());
-            }
+    let mut conn_lock = NVIM_CONN.lock().await;
+    if let Some(sender) = conn_lock.as_ref() {
+        if !sender.is_closed() {
+            return Ok(sender.clone());
         }
     }
 
@@ -243,7 +241,6 @@ async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
         }
     });
 
-    let mut conn_lock = NVIM_CONN.lock().await;
     *conn_lock = Some(tx.clone());
     Ok(tx)
 }
@@ -1004,7 +1001,6 @@ fn init_logging(app_name: &str) -> tracing_appender::non_blocking::WorkerGuard {
 mod tests {
     use super::*;
     use tokio::io::BufReader;
-    use tokio::io::AsyncReadExt;
 
     #[test]
     fn test_rmpv_to_json_primitives() {