[refactor] Remove legacy thread management for TaskQueue

- Add proper async worker management to TaskQueue class
- Remove redundant task_worker_thread and task_worker_lock global variables
- Replace manual threading with async task management
- Update is_processing() logic to use TaskQueue state instead of thread status
- Implement automatic worker cleanup when queue processing completes
- Simplify queue start endpoint to use TaskQueue.start_worker()

Author: christian-byrne

comfyui_manager/glob/manager_server.py

@@ -210,7 +210,31 @@ def __init__(self):
         self.batch_id = None
         self.batch_start_time = None
         self.batch_state_before = None
+        self._worker_task = None
 
+    def is_processing(self) -> bool:
+        """Check if the queue is currently processing tasks"""
+        return (
+            self._worker_task is not None 
+            and not self._worker_task.done() 
+            and (len(self.running_tasks) > 0 or len(self.pending_tasks) > 0)
+        )
+    
+    async def start_worker(self) -> bool:
+        """Start the task worker if not already running. Returns True if started, False if already running."""
+        if self._worker_task is not None and not self._worker_task.done():
+            return False  # Already running
+        
+        self._worker_task = asyncio.create_task(self._worker())
+        return True
+    
+    async def _worker(self):
+        """Internal worker that processes the task queue"""
+        try:
+            await task_worker()
+        finally:
+            # Clean up worker reference when done
+            self._worker_task = None
 
     def get_current_state(self) -> TaskStateMessage:
         return TaskStateMessage(
@@ -332,7 +356,7 @@ async def task_done(
                 ui_id=item.ui_id,
                 result=result_msg,
                 kind=item.kind,
-                status=pydantic_status,
+                status=status,
                 timestamp=datetime.fromisoformat(timestamp),
                 state=self.get_current_state(),
             ),
@@ -536,9 +560,6 @@ def _extract_batch_operations(self) -> list[BatchOperation]:
 
 task_queue = TaskQueue()
 
-# Legacy variables for compatibility
-task_worker_thread = None
-task_worker_lock = threading.Lock()
 
 
 # Note: Model path utilities moved to model_utils.py to avoid duplication
@@ -1385,8 +1406,7 @@ async def queue_count(request):
                 "done_count": len(history_client_tasks),
                 "in_progress_count": len(running_client_tasks),
                 "pending_count": len(pending_client_tasks),
-                "is_processing": task_worker_thread is not None
-                and task_worker_thread.is_alive(),
+                "is_processing": len(running_client_tasks) > 0,
             }
         )
     else:
@@ -1397,32 +1417,22 @@ async def queue_count(request):
                 "done_count": task_queue.done_count(),
                 "in_progress_count": len(task_queue.running_tasks),
                 "pending_count": len(task_queue.pending_tasks),
-                "is_processing": task_worker_thread is not None
-                and task_worker_thread.is_alive(),
+                "is_processing": task_queue.is_processing(),
             }
         )
 
 
-task_worker_thread: threading.Thread = None
 
 
 @routes.get("/v2/manager/queue/start")
 async def queue_start(request):
-    with task_worker_lock:
-        # finalize_temp_queue_batch()
-        return _queue_start()
-
-
-def _queue_start():
-    global task_worker_thread
-
-    if task_worker_thread is not None and task_worker_thread.is_alive():
-        return web.Response(status=201)  # already in-progress
-
-    task_worker_thread = threading.Thread(target=lambda: asyncio.run(task_worker()))
-    task_worker_thread.start()
-
-    return web.Response(status=200)
+    # finalize_temp_queue_batch()
+    started = await task_queue.start_worker()
+    
+    if started:
+        return web.Response(status=200)  # Started successfully
+    else:
+        return web.Response(status=201)  # Already in-progress
 
 
 @routes.get("/v2/manager/queue/update_comfyui")