panda
74f3f03d2c
将单体 Streamlit 应用拆分为三层架构： - api_server.py: FastAPI SSE 流式后端 (端口 8000) - frontend/: Vue 3 + Vite + Pinia 聊天前端 (端口 5173) - agent/graph.py: 新增 node_start 回调支持 - 更新启动脚本为三服务模式 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
130 lines
3.8 KiB
Python
130 lines
3.8 KiB
Python
"""多会话持久化管理模块。
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每个会话对应一个独立的 JSON 文件存储在 ./sessions/ 目录下。
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"""
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import json
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import os
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import uuid
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Optional
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from dotenv import load_dotenv
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from backend.logger import get_logger
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load_dotenv()
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_session_log = get_logger("session")
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SESSIONS_DIR = Path(os.getenv("SESSIONS_DIR", "./sessions"))
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def _ensure_dir():
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SESSIONS_DIR.mkdir(parents=True, exist_ok=True)
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def _session_path(session_id: str) -> Path:
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return SESSIONS_DIR / f"{session_id}.json"
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def generate_session_id() -> str:
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return uuid.uuid4().hex[:12]
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def create_session(name: str = "", agent_state: Optional[dict] = None) -> dict:
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"""创建新会话，返回会话元数据。"""
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_ensure_dir()
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sid = generate_session_id()
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now = _now_iso()
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agent_state = agent_state or {}
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agent_state["session_id"] = sid
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data = {
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"session_id": sid,
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"session_name": name or f"新建报表 {now[:10]}",
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"created_at": now,
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"updated_at": now,
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"agent_state": agent_state,
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}
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with open(_session_path(sid), "w", encoding="utf-8") as f:
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json.dump(data, f, ensure_ascii=False, indent=2)
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_session_log.info("创建会话", extra={"session_id": sid, "session_name": data["session_name"]})
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return data
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def load_session(session_id: str) -> Optional[dict]:
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"""按 ID 加载会话数据。未找到则返回 None。"""
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_ensure_dir()
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fp = _session_path(session_id)
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if not fp.exists():
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return None
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with open(fp, "r", encoding="utf-8") as f:
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return json.load(f)
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def save_session(session_id: str, agent_state: dict, session_name: str = ""):
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"""将会话状态保存（更新）至磁盘。"""
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_ensure_dir()
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fp = _session_path(session_id)
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data = {}
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if fp.exists():
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with open(fp, "r", encoding="utf-8") as f:
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data = json.load(f)
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data["session_id"] = session_id
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if session_name:
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data["session_name"] = session_name
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if not data.get("session_name"):
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data["session_name"] = f"报表 {data.get('created_at', _now_iso())[:10]}"
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data["updated_at"] = _now_iso()
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if not data.get("created_at"):
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data["created_at"] = data["updated_at"]
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data["agent_state"] = agent_state
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with open(fp, "w", encoding="utf-8") as f:
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json.dump(data, f, ensure_ascii=False, indent=2)
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def get_session_state(session_id: str) -> Optional[dict]:
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"""获取会话的完整 agent_state，用于 REST API。
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返回 dict 包含 session_id, session_name, created_at, updated_at, agent_state。
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未找到则返回 None。
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"""
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return load_session(session_id)
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def list_all_sessions() -> list[dict]:
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"""列出所有历史会话（仅摘要，不含完整 agent_state）。"""
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_ensure_dir()
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sessions = []
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for fp in sorted(SESSIONS_DIR.glob("*.json"), key=os.path.getmtime, reverse=True):
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try:
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with open(fp, "r", encoding="utf-8") as f:
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data = json.load(f)
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sessions.append({
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"session_id": data.get("session_id", fp.stem),
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"session_name": data.get("session_name", fp.stem),
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"created_at": data.get("created_at", ""),
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"updated_at": data.get("updated_at", ""),
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})
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except (json.JSONDecodeError, KeyError):
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continue
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return sessions
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def delete_session(session_id: str) -> bool:
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"""按 ID 删除会话文件。"""
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_ensure_dir()
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fp = _session_path(session_id)
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if fp.exists():
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fp.unlink()
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_session_log.info("删除会话", extra={"session_id": session_id})
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return True
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return False
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def _now_iso() -> str:
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return datetime.now(timezone.utc).isoformat()
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