fix: correctly synchronize MCP client initialization

Author: zouyonghe

astrbot/core/provider/func_tool_manager.py

@@ -214,39 +214,68 @@ async def init_mcp_clients(self) -> None:
         )["mcpServers"]
 
         tasks: dict[str, asyncio.Task] = {}
+        ready_futures: dict[str, asyncio.Future] = {}
 
         for name, cfg in mcp_server_json_obj.items():
             if cfg.get("active", True):
                 event = asyncio.Event()
+                ready_future = asyncio.get_running_loop().create_future()
                 task = asyncio.create_task(
-                    self._init_mcp_client_task_wrapper(name, cfg, event),
+                    self._init_mcp_client_task_wrapper(
+                        name,
+                        cfg,
+                        event,
+                        ready_future,
+                    ),
                 )
                 tasks[name] = task
+                ready_futures[name] = ready_future
                 self.mcp_client_event[name] = event
 
-        if tasks:
-            logger.info(f"等待 {len(tasks)} 个 MCP 服务初始化...")
+        if ready_futures:
+            logger.info(f"等待 {len(ready_futures)} 个 MCP 服务初始化...")
 
-            done, pending = await asyncio.wait(tasks.values(), timeout=20.0)
+            _, pending_futures = await asyncio.wait(
+                ready_futures.values(),
+                timeout=20.0,
+            )
+
+            pending_services = {
+                name
+                for name, ready_future in ready_futures.items()
+                if ready_future in pending_futures
+            }
 
-            if pending:
+            if pending_services:
                 logger.warning(
                     "MCP 服务初始化超时（20秒），部分服务可能未完全加载。"
                     "建议检查 MCP 服务器配置和网络连接。"
                 )
-                for task in pending:
+                for name in pending_services:
+                    task = tasks[name]
                     task.cancel()
+                await asyncio.gather(
+                    *(tasks[name] for name in pending_services),
+                    return_exceptions=True,
+                )
 
             success_count = 0
             failed_services: list[str] = []
 
-            for name, task in tasks.items():
-                if task in pending:
+            for name, ready_future in ready_futures.items():
+                if name in pending_services:
                     logger.error(f"MCP 服务 {name} 初始化超时")
                     failed_services.append(name)
+                    self.mcp_client_event.pop(name, None)
+                    continue
+
+                if ready_future.cancelled():
+                    logger.error(f"MCP 服务 {name} 初始化已取消")
+                    failed_services.append(name)
+                    self.mcp_client_event.pop(name, None)
                     continue
 
-                exc = task.exception()
+                exc = ready_future.exception()
                 if exc is not None:
                     logger.error(f"MCP 服务 {name} 初始化失败: {exc}")
                     # 仅在 debug 级别输出完整配置，避免在生产日志中泄露敏感信息
@@ -259,6 +288,7 @@ async def init_mcp_clients(self) -> None:
                         parsed = urllib.parse.urlparse(cfg["url"])
                         logger.debug(f"  主机: {parsed.scheme}://{parsed.netloc}")
                     failed_services.append(name)
+                    self.mcp_client_event.pop(name, None)
                 else:
                     success_count += 1
 
@@ -275,15 +305,26 @@ async def _init_mcp_client_task_wrapper(
         name: str,
         cfg: dict,
         event: asyncio.Event,
+        ready_future: asyncio.Future | None = None,
     ) -> None:
         """初始化 MCP 客户端的包装函数，用于捕获异常"""
         initialized = False
         try:
             await self._init_mcp_client(name, cfg)
             initialized = True
+            if ready_future and not ready_future.done():
+                ready_future.set_result(True)
             await event.wait()
             logger.info(f"收到 MCP 客户端 {name} 终止信号")
-        except Exception:
+        except asyncio.CancelledError:
+            if ready_future and not ready_future.done():
+                ready_future.set_exception(
+                    asyncio.TimeoutError("MCP 客户端初始化超时"),
+                )
+            raise
+        except Exception as e:
+            if ready_future and not ready_future.done():
+                ready_future.set_exception(e)
             if not initialized:
                 # 初始化阶段失败，记录错误并向上抛出让 task.exception() 捕获
                 logger.error(f"初始化 MCP 客户端 {name} 失败", exc_info=True)
@@ -387,22 +428,22 @@ async def enable_mcp_server(
         if not event:
             event = asyncio.Event()
         if not ready_future:
-            ready_future = asyncio.Future()
+            ready_future = asyncio.get_running_loop().create_future()
         if name in self.mcp_client_dict:
             return
-        asyncio.create_task(
+        init_task = asyncio.create_task(
             self._init_mcp_client_task_wrapper(name, config, event, ready_future),
         )
         try:
             await asyncio.wait_for(ready_future, timeout=timeout)
-        finally:
+        except asyncio.TimeoutError:
+            init_task.cancel()
+            await asyncio.gather(init_task, return_exceptions=True)
+            self.mcp_client_event.pop(name, None)
+            raise
+        else:
             self.mcp_client_event[name] = event
 
-        if ready_future.done() and ready_future.exception():
-            exc = ready_future.exception()
-            if exc is not None:
-                raise exc
-
     async def disable_mcp_server(
         self,
         name: str | None = None,