{"record":{"id":"9c7457e1c9558735","repo":"datawhalechina/hello-agents","slug":"e-9c7457","errorCode":null,"errorMessage":"无法保存会话记录：{e}","messagePattern":"无法保存会话记录：(.+?)","errorType":"exception","errorClass":"FileWriteError","httpStatus":null,"severity":"error","filePath":"Co-creation-projects/Yixiang-Wu-LearningAgent/core/file_manager.py","lineNumber":95,"sourceCode":"    def save_session(self, domain: str, session_content: str) -> Path:\n        \"\"\"\n        保存单次学习会话记录\n\n        Args:\n            domain: 领域名称\n            session_content: 会话内容\n\n        Returns:\n            保存的文件路径\n        \"\"\"\n        date = datetime.now().strftime(\"%Y-%m-%d\")\n        time = datetime.now().strftime(\"%H-%M\")\n        session_path = self.BASE_DIR / domain / \"sessions\" / f\"session_{date}_{time}.md\"\n\n        try:\n            session_path.write_text(session_content, encoding=\"utf-8\")\n        except Exception as e:\n            raise FileWriteError(f\"无法保存会话记录：{e}\")\n\n        return session_path\n\n    def read_plan(self, domain: str) -> str:\n        \"\"\"\n        读取学习计划\n\n        Args:\n            domain: 领域名称\n\n        Returns:\n            计划内容\n\n        Raises:\n            FileNotFoundError: 如果计划不存在\n        \"\"\"\n        plan_path = self.BASE_DIR / domain / \"plan.md\"\n        if not plan_path.exists():","sourceCodeStart":77,"sourceCodeEnd":113,"githubUrl":"https://github.com/datawhalechina/hello-agents/blob/606a07d341a47be773fab7f4b71177f53f96b2c3/Co-creation-projects/Yixiang-Wu-LearningAgent/core/file_manager.py#L77-L113","documentation":"FileWriteError raised by FileManager.save_session when writing a session transcript to BASE_DIR/<domain>/sessions/session_<date>_<time>.md fails. Besides missing parent directories, the timestamped filename uses minute resolution, so two sessions saved within the same minute silently overwrite each other rather than erroring — the write itself only fails on missing dirs or OS-level errors.","triggerScenarios":"Calling save_session when BASE_DIR/<domain>/sessions/ does not exist; permission failure on the sessions directory; disk full; BASE_DIR on a filesystem mounted read-only (e.g. squashed container layer).","commonSituations":"First session saved for a fresh domain; containerized deployment writing to an unmounted path; two rapid sessions in one minute overwriting each other (data loss, not exception).","solutions":["mkdir parents before writing: session_path.parent.mkdir(parents=True, exist_ok=True)","Add seconds + a random suffix to the filename (e.g. %H-%M-%S plus uuid4 hex) to avoid same-minute collisions","Verify write permissions on the sessions directory in deployment","Use `raise ... from e` to keep the cause"],"exampleFix":"# before\nsession_path = self.BASE_DIR / domain / \"sessions\" / f\"session_{date}_{time}.md\"\ntry:\n    session_path.write_text(session_content, encoding=\"utf-8\")\nexcept Exception as e:\n    raise FileWriteError(f\"无法保存会话记录：{e}\")\n\n# after\nstamp = datetime.now().strftime(\"%Y-%m-%d_%H-%M-%S\")\nsession_path = self.BASE_DIR / domain / \"sessions\" / f\"session_{stamp}_{uuid4().hex[:6]}.md\"\ntry:\n    session_path.parent.mkdir(parents=True, exist_ok=True)\n    session_path.write_text(session_content, encoding=\"utf-8\")\nexcept OSError as e:\n    raise FileWriteError(f\"无法保存会话记录 {session_path}: {e}\") from e","handlingStrategy":"validation","validationCode":"def session_dir_ready(base_dir: Path, domain: str) -> bool:\n    d = base_dir / domain / \"sessions\"\n    return d.is_dir() and os.access(d, os.W_OK)","typeGuard":null,"tryCatchPattern":"try:\n    path = fm.save_session(domain, content)\nexcept FileWriteError as e:\n    # sessions are append-only history: log and continue rather than crash the chat\n    logger.exception(\"session persist failed for %s\", domain)","preventionTips":["mkdir the sessions directory at domain creation","Use second-resolution + unique suffix in filenames to prevent same-minute overwrites","Treat session persistence as non-fatal: a failed transcript write should not abort the user's learning session"],"tags":["filesystem","io","python","timestamp-collision","learning-agent"],"backgroundTag":null,"analyzedSha":"606a07d341a47be773fab7f4b71177f53f96b2c3","analyzedAt":"2026-08-14T22:57:27.446Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}