100 lines
4.2 KiB
Python
100 lines
4.2 KiB
Python
"""WebSocket 路由：流式对话 + 重新生成。协议：
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客户端 → {"type":"chat","content":"...","agent_id":null,"model":"","file_ids":[]}
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{"type":"regenerate"}
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服务端 → {"type":"delta","message_id":1,"kind":"reasoning"|"content","content":"增量文本"}
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{"type":"done","message_id":1}
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{"type":"suggestions","message_id":1,"items":["..",".."]}
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{"type":"title","title":"..."}
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{"type":"error","message":"..."}
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"""
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import asyncio
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from fastapi import APIRouter, WebSocket, WebSocketDisconnect
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from sqlalchemy.orm import Session
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from ..core.security import decode_token
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from ..database import SessionLocal
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from ..models import ChatSession, User
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from ..services import chat_service
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router = APIRouter()
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# session_id -> set[WebSocket]（用于推送建议/标题）
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_conns: dict[int, set[WebSocket]] = {}
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def push_to_session(session_id: int, payload: dict):
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"""向该会话的所有在线连接推送消息。"""
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for ws in list(_conns.get(session_id, set())):
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try:
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asyncio.get_event_loop().create_task(ws.send_json(payload))
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except Exception:
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pass
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@router.websocket("/chat/ws")
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async def chat_ws(websocket: WebSocket):
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await websocket.accept()
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token = websocket.query_params.get("token", "")
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session_id = websocket.query_params.get("session_id", "")
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payload = decode_token(token)
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if not payload:
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await websocket.send_json({"type": "error", "message": "认证失败"})
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await websocket.close()
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return
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db: Session = SessionLocal()
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try:
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user = db.get(User, int(payload["sub"]))
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if not user or not user.is_active:
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await websocket.send_json({"type": "error", "message": "用户无效"})
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await websocket.close()
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return
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session = db.get(ChatSession, int(session_id)) if session_id.isdigit() else None
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if not session or session.user_id != user.id:
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await websocket.send_json({"type": "error", "message": "会话不存在"})
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await websocket.close()
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return
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_conns.setdefault(session.id, set()).add(websocket)
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try:
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while True:
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data = await websocket.receive_json()
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msg_type = data.get("type")
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if msg_type == "chat":
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content = (data.get("content") or "").strip()
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file_ids = data.get("file_ids") or []
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if not content and not file_ids:
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await websocket.send_json({"type": "error", "message": "消息不能为空"})
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continue
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try:
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async for (kind, delta), message_id in chat_service.chat_stream(
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db, user, session, content,
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agent_id=data.get("agent_id"), model=data.get("model", ""),
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file_ids=file_ids,
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):
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await websocket.send_json({"type": "delta", "message_id": message_id, "kind": kind, "content": delta})
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await websocket.send_json({"type": "done", "message_id": message_id})
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except Exception as e:
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await websocket.send_json({"type": "error", "message": f"模型调用失败：{e}"})
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elif msg_type == "regenerate":
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try:
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async for (kind, delta), message_id in chat_service.regenerate_stream(db, session):
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await websocket.send_json({"type": "delta", "message_id": message_id, "kind": kind, "content": delta})
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await websocket.send_json({"type": "done", "message_id": message_id})
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except LookupError as e:
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await websocket.send_json({"type": "error", "message": str(e)})
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except Exception as e:
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await websocket.send_json({"type": "error", "message": f"模型调用失败：{e}"})
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finally:
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_conns.get(session.id, set()).discard(websocket)
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if not _conns.get(session.id):
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_conns.pop(session.id, None)
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except WebSocketDisconnect:
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pass
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finally:
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db.close()
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