import json
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import uuid
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from fastapi import WebSocket, WebSocketDisconnect, APIRouter, Depends
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import asyncio
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import websockets
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from sqlalchemy.orm import Session
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from app.api import get_current_user_websocket
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from app.config.config import settings
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from app.models.agent_model import AgentModel, AgentType
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from app.models.base_model import get_db
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from app.models.user_model import UserModel
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from app.service.dialog import update_session_history
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from app.service.basic import BasicService
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from app.service.ragflow import RagflowService
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from app.service.service_token import get_bisheng_token, get_ragflow_token
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router = APIRouter()
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# 中间层WebSocket 服务器，接收客户端的连接
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@router.websocket("/ws/{agent_id}/{chat_id}")
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async def handle_client(websocket: WebSocket,
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agent_id: str,
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chat_id: str,
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current_user: UserModel = Depends(get_current_user_websocket),
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db: Session = Depends(get_db)):
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tasks = []
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await websocket.accept()
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print(f"Client {agent_id} connected")
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agent = db.query(AgentModel).filter(AgentModel.id == agent_id).first()
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if not agent:
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ret = {"message": "Agent not found", "type": "close"}
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await websocket.send_json(ret)
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return
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agent_type = agent.agent_type
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if chat_id == "" or chat_id == "0":
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ret = {"message": "Chat ID not found", "type": "close"}
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await websocket.send_json(ret)
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return
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if agent_type == AgentType.RAGFLOW:
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ragflow_service = RagflowService(settings.fwr_base_url)
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token = get_ragflow_token(db, current_user.id)
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try:
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async def forward_to_ragflow():
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while True:
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is_new = False
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message = await websocket.receive_json()
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print(f"Received from client {chat_id}: {message}")
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chat_history = message.get('chatHistory', [])
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message["role"] = "user"
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if len(chat_history) == 0:
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chat_history = await ragflow_service.get_session_history(token, chat_id)
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if len(chat_history) == 0:
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is_new = True
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chat_history = await ragflow_service.set_session(token, agent_id,
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message, chat_id, True)
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# print("chat_history------------------------", chat_history)
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if len(chat_history) == 0:
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result = {"message": "内部错误：创建会话失败", "type": "close"}
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await websocket.send_json(result)
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await websocket.close()
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return
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else:
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chat_history.append({
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"content": message["message"],
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"doc_ids": message.get("doc_ids", []),
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"role": "user"
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})
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complete_response = ""
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async for rag_response in ragflow_service.chat(token, chat_id, chat_history):
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try:
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if rag_response[:5] == "data:":
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# 如果是，则截取掉前5个字符，并去除首尾空白符
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text = rag_response[5:].strip()
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else:
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# 否则，保持原样
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text = rag_response
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complete_response += text
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try:
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json_data = json.loads(complete_response)
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data = json_data.get("data")
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if data is True: # 完成输出
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result = {"message": "", "type": "close"}
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elif data is None: # 发生错误
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answer = json_data.get("retmsg", json_data.get("retcode"))
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result = {"message": "内部错误：" + answer, "type": "message"}
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else: # 正常输出
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answer = data.get("answer", "")
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reference = data.get("reference", {})
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result = {"message": answer, "type": "message", "reference": reference}
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await websocket.send_json(result)
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complete_response = ""
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except json.JSONDecodeError as e:
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print(f"Error decoding JSON: {e}")
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# print(f"Response text: {text}")
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except Exception as e2:
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result = {"message": f"内部错误： {e2}", "type": "close"}
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await websocket.send_json(result)
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print(f"Error process message of ragflow: {e2}")
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dialog_chat_history = await ragflow_service.get_session_history(token, chat_id, 1)
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await update_session_history(db, dialog_chat_history, current_user.id, is_new)
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# 启动任务处理客户端消息
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tasks = [
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asyncio.create_task(forward_to_ragflow())
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]
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await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
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except WebSocketDisconnect as e1:
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print(f"Client {chat_id} disconnected: {e1}")
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await websocket.close()
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except Exception as e:
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print(f"Exception occurred: {e}")
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finally:
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print("Cleaning up resources of ragflow")
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# 取消所有任务
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for task in tasks:
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if not task.done():
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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elif agent_type == AgentType.BISHENG:
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token = get_bisheng_token(db, current_user.id)
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service_uri = f"{settings.sgb_websocket_url}/api/v1/assistant/chat/{agent_id}?t=&chat_id={chat_id}"
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headers = {'cookie': f"access_token_cookie={token};"}
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async with websockets.connect(service_uri, extra_headers=headers) as service_websocket:
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try:
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# 处理客户端发来的消息
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async def forward_to_service():
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while True:
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message = await websocket.receive_json()
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print(f"Received from client, {chat_id}: {message}")
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# 添加 'agent_id' 和 'chat_id' 字段
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message['flow_id'] = agent_id
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message['chat_id'] = chat_id
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msg = message["message"]
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del message["message"]
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message['inputs'] = {
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"data": {"chatId": chat_id, "id": agent_id, "type": "assistant"},
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"input": msg
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}
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await service_websocket.send(json.dumps(message))
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print(f"Forwarded to bisheng: {message}")
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# 监听毕昇发来的消息并转发给客户端
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async def forward_to_client():
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while True:
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message = await service_websocket.recv()
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print(f"Received from bisheng: {message}")
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data = json.loads(message)
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if data["type"] == "close" or data["type"] == "stream" or data["type"] == "end_cover":
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if data["type"] == "close":
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t = "close"
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else:
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t = "stream"
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result = {"message": data["message"], "type": t}
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await websocket.send_json(result)
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print(f"Forwarded to client, {chat_id}: {result}")
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# 启动两个任务，分别处理客户端和服务端的消息
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tasks = [
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asyncio.create_task(forward_to_service()),
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asyncio.create_task(forward_to_client())
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]
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done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
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# 取消未完成的任务
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for task in pending:
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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except WebSocketDisconnect as e:
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print(f"WebSocket connection closed with code {e.code}: {e.reason}")
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await websocket.close()
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await service_websocket.close()
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except Exception as e:
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print(f"Exception occurred: {e}")
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finally:
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print("Cleaning up resources of bisheng")
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# 取消所有任务
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for task in tasks:
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if not task.done():
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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elif agent_type == AgentType.BASIC:
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try:
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while True:
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# 接收前端消息
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message = await websocket.receive_json()
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question = message.get("message")
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if not question:
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await websocket.send_json({"message": "Invalid request", "type": "error"})
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continue
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service = BasicService(base_url=settings.basic_base_url)
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async for result in service.excel_talk(question, chat_id):
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try:
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if result[:5] == "data:":
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# 如果是，则截取掉前5个字符，并去除首尾空白符
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text = result[5:].strip()
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else:
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# 否则，保持原样
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text = result
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try:
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data = json.loads(text)
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output = data.get("output", "")
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excel_name = data.get("excel_name", "")
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image_name = data.get("excel_name", "")
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excel_url = None
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image_url = None
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if excel_name:
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excel_url = f"/api/files/download/?agent_id=basic_excel_talk&file_id={excel_name}&file_type=excel"
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if image_name:
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image_url = f"/api/files/download/?agent_id=basic_excel_talk&file_id={image_name}&file_type=image"
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result = {"message": output, "type": "message", "excel_url": excel_url, "image_url": image_url}
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await websocket.send_json(result | data)
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except json.JSONDecodeError as e:
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print(f"Error decoding JSON: {e}")
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print(f"Response text: {text}")
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except Exception as e2:
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result = {"message": f"内部错误： {e2}", "type": "close"}
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await websocket.send_json(result)
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print(f"Error process message of basic agent: {e2}")
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except Exception as e:
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await websocket.send_json({"message": str(e), "type": "error"})
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finally:
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await websocket.close()
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print(f"Client {agent_id} disconnected")
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else:
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ret = {"message": "Agent not found", "type": "close"}
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await websocket.send_json(ret)
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