{"record":{"id":"bfd2eaff02f1f9e0","repo":"jd-opensource/joyagent-jdgenie","slug":"self-server-url-ping-str-e","errorCode":null,"errorMessage":"{self.server_url} 服务器ping失败: {str(e)}","messagePattern":"(.+?) 服务器ping失败: (.+?)","errorType":"exception","errorClass":"Exception","httpStatus":null,"severity":"error","filePath":"genie-client/app/client.py","lineNumber":264,"sourceCode":"        向服务器发送ping请求以验证连接\n\n        Returns:\n            str: 成功消息\n\n        Raises:\n            Exception: 当ping失败时抛出异常\n        \"\"\"\n        try:\n            async with self._sse_connection() as session:\n                logger.info(f\"{self.server_url} 正在ping服务器...\")\n                await session.send_ping()\n                success_msg = \"服务器ping成功！\"\n                logger.info(success_msg)\n                return success_msg\n        except Exception as e:\n            error_msg = f\"{self.server_url} 服务器ping失败: {str(e)}\"\n            logger.error(error_msg)\n            raise Exception(error_msg) from e\n\n    async def list_tools(self) -> List[Any]:\n        \"\"\"\n        获取服务器上可用的工具列表\n\n        Returns:\n            List[Any]: 可用工具列表\n\n        Raises:\n            Exception: 当获取工具列表失败时抛出异常\n        \"\"\"\n        try:\n            async with self._sse_connection() as session:\n                logger.info(f\"{self.server_url} 正在获取工具列表...\")\n                response = await session.list_tools()\n                tools = response.tools if hasattr(response, 'tools') else []\n\n                tool_count = len(tools)","sourceCodeStart":246,"sourceCodeEnd":282,"githubUrl":"https://github.com/jd-opensource/joyagent-jdgenie/blob/2417e0b8b636d941ad5fb14c59b20dddfef5375d/genie-client/app/client.py#L246-L282","documentation":"`ping_server` wraps any exception thrown while establishing or completing the SSE ping into a single Exception prefixed with the server URL. It is a catch-all: the inner cause (auth, network, protocol) is attached via `from e`, so this is a labeling wrapper, not a distinct failure mode.","triggerScenarios":"Calling `await client.ping_server()` and the SSE session fails for any reason (auth 401, network error, server not speaking MCP, timeout) — the inner message is appended to the raised text.","commonSituations":"Health-check at startup against a not-yet-ready server; misconfigured server_url; credential issues surfacing as ping failures.","solutions":["Read the chained cause (`__cause__`) or the appended inner message to find the real failure (auth vs network)","Re-run after confirming the server is up: this is usually a transient startup ordering issue","Validate server_url and credentials as with the underlying auth/network errors","Add retry-with-backoff around ping_server for readiness checks"],"exampleFix":"// before\nawait client.ping_server()  # server not started yet\n// after\nawait asyncio.sleep(5)  # wait for server readiness\nawait client.ping_server()","handlingStrategy":"retry","validationCode":"await client.ping_server()  # cheap readiness check before other calls\ntypeGuard = None","typeGuard":null,"tryCatchPattern":"try:\n    msg = await client.ping_server()\nexcept Exception as e:\n    logger.warning(f\"ping failed: {e.__cause__}\")\n    # decide: retry (transient) vs abort (auth/config)","preventionTips":["Gate all MCP calls behind a successful ping at startup","Use readiness probes so the client only starts when the server is up","Log `e.__cause__` to distinguish auth vs network causes"],"tags":["healthcheck","mcp","sse"],"backgroundTag":"http-request-failed","analyzedSha":"2417e0b8b636d941ad5fb14c59b20dddfef5375d","analyzedAt":"2026-09-08T11:28:19.414Z","contentChangedAt":"2026-09-08T11:28:19.414Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}