fix(mcp-memory,nvim-core): eliminate lock contention in get_nvim_connection and resolve CPU bound loop in graph.rs

nvim-core/src/lib.rs

@@ -391,6 +391,8 @@ fn handle_nvim_notification(params: &[rmpv::Value]) {
 }
 
 async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
+    let target_socket = read_active_socket_file().await.unwrap_or_default();
+
     // Fast path: If NVIM_CONN is already active and healthy, check if active_nvim.txt matches
     // without spawning any external nvim.exe child process!
     {
@@ -400,9 +402,8 @@ async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
         {
             let active_lock = ACTIVE_SOCKET.lock().await;
             if let Some(ref current_socket) = *active_lock
-                && let Ok(target) = read_active_socket_file().await
-                && !target.is_empty()
-                && &target == current_socket
+                && !target_socket.is_empty()
+                && &target_socket == current_socket
             {
                 return Ok(sender.clone());
             }

server/src/handlers/graph.rs

@@ -632,7 +632,8 @@ impl McpTool for ReadGraphHandler {
         let limit = req.limit;
         let offset = req.offset.unwrap_or(0);
 
-        let data = state.read_graph(|full| -> crate::error::Result<String> {
+        tokio::task::spawn_blocking(move || {
+            state.read_graph(|full| -> crate::error::Result<String> {
                 let filtered_entities: Vec<(&String, &crate::models::Entity)> = full
                     .entities
                     .iter()
@@ -743,8 +744,8 @@ impl McpTool for ReadGraphHandler {
                 }
 
                 Ok(result_json)
-        })?;
-        Ok(data)
+            })
+        }).await.map_err(|e| crate::error::AppError::Internal(format!("Graph read task panicked: {}", e)))?
     }
 }
 pub struct SearchNodesHandler;