fix: 修复ChatManager重复创建后台任务可能导致的内存泄漏

src/chat/message_receive/chat_stream.py

@@ -134,6 +134,12 @@ class ChatManager:
             self.streams: Dict[str, ChatStream] = {}  # stream_id -> ChatStream
             self.last_messages: OrderedDict[str, "MessageRecv"] = OrderedDict()  # stream_id -> last_message
             self.last_message_timestamps: Dict[str, float] = {}  # stream_id -> timestamp
+            
+            # 保存 task handler
+            self._cleanup_task: Optional[asyncio.Task] = None
+            self._auto_save_task: Optional[asyncio.Task] = None
+            self._initialize_task: Optional[asyncio.Task] = None
+            
             try:
                 db.connect(reuse_if_open=True)
                 # 确保 ChatStreams 表存在
@@ -142,51 +148,98 @@ class ChatManager:
                 logger.error(f"数据库连接或 ChatStreams 表创建失败: {e}")
 
             self._initialized = True
-            # 在事件循环中启动初始化
-            # asyncio.create_task(self._initialize())
-            # # 启动自动保存任务
-            # asyncio.create_task(self._auto_save_task())
-            # # 启动 TTL 清理任务
-            asyncio.create_task(self._cleanup_expired_messages())
 
+    def start(self):
+        """启动后台任务"""
+        if self._cleanup_task is not None or self._auto_save_task is not None:
+            logger.warning("后台任务已经在运行，跳过重复启动")
+            return
+        
+        # 创建并保存 task handler
+        self._cleanup_task = asyncio.create_task(self._cleanup_expired_messages())
+        # self._auto_save_task = asyncio.create_task(self._auto_save_task_loop())
+        # self._initialize_task = asyncio.create_task(self._initialize())
+        logger.info("ChatManager 后台任务已启动")
+    
+    async def shutdown(self):
+        """安全关闭所有后台任务"""
+        
+        # 取消所有任务
+        tasks_to_cancel = []
+        if self._cleanup_task:
+            tasks_to_cancel.append(self._cleanup_task)
+        if self._auto_save_task:
+            tasks_to_cancel.append(self._auto_save_task)
+        if self._initialize_task:
+            tasks_to_cancel.append(self._initialize_task)
+        
+        for task in tasks_to_cancel:
+            task.cancel()
+        if tasks_to_cancel:
+            await asyncio.gather(*tasks_to_cancel, return_exceptions=True)
+        
+        # 清空 task handler
+        self._cleanup_task = None
+        self._auto_save_task = None
+        self._initialize_task = None
+        
+        logger.info("ChatManager 后台任务已安全关闭")
+    
     async def _initialize(self):
         """异步初始化"""
         try:
             await self.load_all_streams()
             logger.info(f"聊天管理器已启动，已加载 {len(self.streams)} 个聊天流")
+        except asyncio.CancelledError:
+            logger.info("初始化任务已取消")
+            raise
         except Exception as e:
             logger.error(f"聊天管理器启动失败: {str(e)}")
 
-    async def _auto_save_task(self):
+    async def _auto_save_task_loop(self):
         """定期自动保存所有聊天流"""
-        while True:
-            await asyncio.sleep(300)  # 每5分钟保存一次
-            try:
-                await self._save_all_streams()
-                logger.info("聊天流自动保存完成")
-            except Exception as e:
-                logger.error(f"聊天流自动保存失败: {str(e)}")
+        try:
+            while True:
+                await asyncio.sleep(300)  # 每5分钟保存一次
+                try:
+                    await self._save_all_streams()
+                    logger.info("聊天流自动保存完成")
+                except Exception as e:
+                    logger.error(f"聊天流自动保存失败: {str(e)}")
+        except asyncio.CancelledError:
+            logger.info("自动保存任务已取消")
+            return
 
     async def _cleanup_expired_messages(self):
         """定期清理过期的 last_messages"""
-        while True:
-            await asyncio.sleep(300)  # 每5分钟清理一次
-            try:
-                current_time = time.time()
-                expired_keys = []
-                
-                for stream_id, timestamp in self.last_message_timestamps.items():
-                    if current_time - timestamp > LAST_MESSAGE_TTL:
-                        expired_keys.append(stream_id)
-                
-                for key in expired_keys:
-                    self.last_messages.pop(key, None)
-                    self.last_message_timestamps.pop(key, None)
-                
-                if expired_keys:
-                    logger.info(f"清理了 {len(expired_keys)} 条过期的 last_messages")
-            except Exception as e:
-                logger.error(f"清理过期消息失败: {str(e)}")
+        try:
+            while True:
+                await asyncio.sleep(300)  # 每5分钟清理一次
+                self._cleanup_once()
+        except asyncio.CancelledError:
+            logger.info("清理任务已取消")
+            return
+        except Exception as e:
+            logger.error(f"清理过期消息失败: {str(e)}")
+
+    def _cleanup_once(self):
+        """执行一次过期消息清理"""
+        try:
+            current_time = time.time()
+            expired_keys = []
+            
+            for stream_id, timestamp in self.last_message_timestamps.items():
+                if current_time - timestamp > LAST_MESSAGE_TTL:
+                    expired_keys.append(stream_id)
+            
+            for key in expired_keys:
+                self.last_messages.pop(key, None)
+                self.last_message_timestamps.pop(key, None)
+            
+            if expired_keys:
+                logger.info(f"清理了 {len(expired_keys)} 条过期的 last_messages")
+        except Exception as e:
+            logger.error(f"执行清理失败: {str(e)}")
 
     def register_message(self, message: "MessageRecv"):
         """注册消息到聊天流"""
@@ -441,8 +494,10 @@ class ChatManager:
 chat_manager = None
 
 
-def get_chat_manager():
+def get_chat_manager(auto_start: bool = True):
     global chat_manager
     if chat_manager is None:
         chat_manager = ChatManager()
+        if auto_start:
+            chat_manager.start()
     return chat_manager