rag-gateway/app/api/chat.py

import json
import uuid

from fastapi import WebSocket, WebSocketDisconnect, APIRouter, Depends
import asyncio
import websockets
from sqlalchemy.orm import Session

from Log import logger
from app.api import get_current_user_websocket
from app.config.config import settings
from app.models.agent_model import AgentModel, AgentType
from app.models.base_model import get_db
from app.models.user_model import UserModel
from app.service.dialog import update_session_history
from app.service.basic import BasicService
from app.service.difyService import DifyService
from app.service.ragflow import RagflowService
from app.service.service_token import get_bisheng_token, get_ragflow_token
from app.service.session import SessionService

router = APIRouter()


# 中间层WebSocket 服务器，接收客户端的连接
@router.websocket("/ws/{agent_id}/{chat_id}")
async def handle_client(websocket: WebSocket,
                        agent_id: str,
                        chat_id: str,
                        current_user: UserModel = Depends(get_current_user_websocket),
                        db: Session = Depends(get_db)):
    tasks = []
    await websocket.accept()
    print(f"Client {agent_id} connected")

    agent = db.query(AgentModel).filter(AgentModel.id == agent_id).first()
    if not agent:
        ret = {"message": "Agent not found", "type": "close"}
        await websocket.send_json(ret)
        return
    agent_type = agent.agent_type
    if chat_id == "" or chat_id == "0":
        ret = {"message": "Chat ID not found", "type": "close"}
        await websocket.send_json(ret)
        return

    if agent_type == AgentType.RAGFLOW:
        ragflow_service = RagflowService(settings.fwr_base_url)
        token = get_ragflow_token(db, current_user.id)
        try:
            async def forward_to_ragflow():
                while True:
                    message = await websocket.receive_json()
                    print(f"Received from client {chat_id}: {message}")
                    chat_history = message.get('chatHistory', [])
                    message["role"] = "user"
                    if len(chat_history) == 0:
                        chat_history = await ragflow_service.get_session_history(token, chat_id)
                        if len(chat_history) == 0:
                            chat_history = await ragflow_service.set_session(token, agent_id,
                                                                             message, chat_id, True)
                            # print("chat_history------------------------", chat_history)
                            if len(chat_history) == 0:
                                result = {"message": "内部错误：创建会话失败", "type": "close"}
                                await websocket.send_json(result)
                                await websocket.close()
                                return
                        else:
                            chat_history.append({
                                "content": message["message"],
                                "doc_ids": message.get("doc_ids", []),
                                "role": "user"
                            })
                    complete_response = ""
                    async for rag_response in ragflow_service.chat(token, chat_id, chat_history):
                        try:
                            if rag_response[:5] == "data:":
                                # 如果是，则截取掉前5个字符，并去除首尾空白符
                                text = rag_response[5:].strip()
                            else:
                                # 否则，保持原样
                                text = rag_response
                            complete_response += text
                            try:
                                json_data = json.loads(complete_response)
                                data = json_data.get("data")
                                if data is True:  # 完成输出
                                    result = {"message": "", "type": "close"}
                                elif data is None:  # 发生错误
                                    answer = json_data.get("retmsg", json_data.get("retcode"))
                                    result = {"message": "内部错误：" + answer, "type": "message"}
                                else:  # 正常输出
                                    answer = data.get("answer", "")
                                    reference = data.get("reference", {})
                                    result = {"message": answer, "type": "message", "reference": reference}
                                await websocket.send_json(result)
                                complete_response = ""
                            except json.JSONDecodeError as e:
                                print(f"Error decoding JSON: {e}")
                                # print(f"Response text: {text}")
                        except Exception as e2:
                            result = {"message": f"内部错误： {e2}", "type": "close"}
                            await websocket.send_json(result)
                            print(f"Error process message of ragflow: {e2}")
                    try:
                        dialog_chat_history = await ragflow_service.get_session_history(token, chat_id, 1)
                        await update_session_history(db, dialog_chat_history, current_user.id)
                    except Exception as e:
                        logger.error(e)
                        logger.error("-----------------保存ragflow的历史会话异常-----------------")

            # 启动任务处理客户端消息
            tasks = [
                asyncio.create_task(forward_to_ragflow())
            ]
            await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
        except WebSocketDisconnect as e1:
            print(f"Client {chat_id} disconnected: {e1}")
            await websocket.close()
        except Exception as e:
            print(f"Exception occurred: {e}")

        finally:
            print("Cleaning up resources of ragflow")
            # 取消所有任务
            for task in tasks:
                if not task.done():
                    task.cancel()
                    try:
                        await task
                    except asyncio.CancelledError:
                        pass

    elif agent_type == AgentType.BISHENG:
        token = get_bisheng_token(db, current_user.id)
        service_uri = f"{settings.sgb_websocket_url}/api/v1/assistant/chat/{agent_id}?t=&chat_id={chat_id}"
        headers = {'cookie': f"access_token_cookie={token};"}

        async with websockets.connect(service_uri, extra_headers=headers) as service_websocket:

            try:
                # 处理客户端发来的消息
                async def forward_to_service():
                    while True:
                        message = await websocket.receive_json()
                        print(f"Received from client, {chat_id}: {message}")
                        # 添加 'agent_id' 和 'chat_id' 字段
                        message['flow_id'] = agent_id
                        message['chat_id'] = chat_id
                        msg = message["message"]
                        del message["message"]
                        message['inputs'] = {
                            "data": {"chatId": chat_id, "id": agent_id, "type": "assistant"},
                            "input": msg
                        }
                        await service_websocket.send(json.dumps(message))
                        print(f"Forwarded to bisheng: {message}")

                # 监听毕昇发来的消息并转发给客户端
                async def forward_to_client():
                    while True:
                        message = await service_websocket.recv()
                        print(f"Received from bisheng: {message}")
                        data = json.loads(message)
                        if data["type"] == "close" or data["type"] == "stream" or data["type"] == "end_cover":
                            if data["type"] == "close":
                                t = "close"
                            else:
                                t = "stream"
                            result = {"message": data["message"], "type": t}
                            await websocket.send_json(result)
                            print(f"Forwarded to client, {chat_id}: {result}")

                # 启动两个任务，分别处理客户端和服务端的消息
                tasks = [
                    asyncio.create_task(forward_to_service()),
                    asyncio.create_task(forward_to_client())
                ]
                done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)

                # 取消未完成的任务
                for task in pending:
                    task.cancel()
                    try:
                        await task
                    except asyncio.CancelledError:
                        pass

            except WebSocketDisconnect as e:
                print(f"WebSocket connection closed with code {e.code}: {e.reason}")
                await websocket.close()
                await service_websocket.close()
            except Exception as e:
                print(f"Exception occurred: {e}")

            finally:
                print("Cleaning up resources of bisheng")
                # 取消所有任务
                for task in tasks:
                    if not task.done():
                        task.cancel()
                        try:
                            await task
                        except asyncio.CancelledError:
                            pass
    elif agent_type == AgentType.BASIC:
        try:
            service = BasicService(base_url=settings.basic_base_url)
            while True:
                # 接收前端消息
                message = await websocket.receive_json()
                question = message.get("message")
                try:
                    SessionService(db).create_session(
                        chat_id,
                        question,
                        agent_id,
                        AgentType.BASIC,
                        current_user.id
                    )
                except Exception as e:
                    logger.error(e)
                if not question:
                    await websocket.send_json({"message": "Invalid request", "type": "error"})
                    continue
                logger.error(agent.type)
                if agent.type == "questionTalk":

                    try:
                        data = await service.questions_talk(question, chat_id)
                        output = data.get("output", "")
                        file_name = data.get("filename", "")

                        excel_url = None
                        if file_name:
                            excel_url = f"/api/files/download/?agent_id=basic_question_talk&file_id={file_name}&file_type=word"
                        result = {"message": output, "type": "message", "file_url": excel_url, "file_name":file_name}
                        try:
                            SessionService(db).update_session(chat_id,
                                                              message={"role": "assistant", "content": result})
                        except Exception as e:
                            logger.error(e)
                        logger.error("-----------------返回数据--------------------")
                        await websocket.send_json(result)
                    except Exception as e2:

                        result = {"message": f"内部错误： {e2}", "type": "close"}
                        logger.error(str(e2))
                        logger.error(f"Error process message of basic chuti agent: {e2}")
                        await websocket.send_json(result)

                else:
                    async for data in service.excel_talk(question, chat_id):
                        output = data.get("output", "")
                        excel_name = data.get("excel_name", "")
                        image_name = data.get("image_name", "")

                        def build_file_url(name, file_type):
                            if not name:
                                return None
                            return (f"/api/files/download/?agent_id={agent_id}&file_id={name}"
                                    f"&file_type={file_type}")
                        excel_url = build_file_url(excel_name, 'excel')
                        image_url = build_file_url(image_name, 'image')
                        if excel_url or data.get("e", ""):
                            try:
                                SessionService(db).update_session(chat_id,
                                                                  message={
                                                                      "content": output,
                                                                      "excel_url": excel_url,
                                                                      "image_url": image_url,
                                                                      "sql": data.get("sql", ""),
                                                                      "code": data.get("code", ""),
                                                                      "e": data.get("e", ""),
                                                                      "role": "assistant"})
                            except Exception as e:
                                logger.error(f"Unexpected error when update_session: {e}")
                        # 发送结果给客户端
                        data["type"] = "message"
                        data["message"] = output
                        data["excel_url"] = excel_url
                        data["image_url"] = image_url
                        await websocket.send_json(data)
        except Exception as e:
            logger.error(e)
            await websocket.send_json({"message": "出现错误！", "type": "error"})
        finally:
            await websocket.close()
            print(f"Client {agent_id} disconnected")
    if agent_type == AgentType.DIFY:
        dify_service = DifyService(settings.dify_base_url)
        # token = get_dify_token(db, current_user.id)
        token = settings.dify_api_token
        try:
            async def forward_to_dify():
                while True:
                    conversation_id = ""
                    receive_message = await websocket.receive_json()
                    print(f"Received from client {chat_id}: {receive_message}")
                    upload_file_id = receive_message.get('upload_file_id', "")
                    question = receive_message.get('message', "")
                    if not question and not image_url:
                        await websocket.send_json({"message": "Invalid request", "type": "error"})
                        continue
                    try:
                        session = SessionService(db).create_session(
                            chat_id,
                            question,
                            agent_id,
                            AgentType.DIFY,
                            current_user.id
                        )
                        conversation_id = session.conversation_id
                    except Exception as e:
                        logger.error(e)
                    # complete_response = ""
                    answer_str = ""
                    async for rag_response in dify_service.chat(token, current_user.id, question, upload_file_id, conversation_id):
                        # print("=============================================")
                        # print(rag_response)
                        try:
                            if rag_response[:5] == "data:":
                                # 如果是，则截取掉前5个字符，并去除首尾空白符
                                complete_response = rag_response[5:].strip()
                            else:
                                # 否则，保持原样
                                complete_response = rag_response
                            # complete_response += text
                            try:
                                data = json.loads(complete_response)
                                complete_response = ""
                                # data = json_data.get("data")
                                if data.get("event") == "agent_message":# "event": "message_end"
                                    if "answer" not in  data or not data["answer"]:  # 信息过滤
                                        logger.error("非法数据--------------------")
                                        # logger.error(data)

                                        continue
                                    else:  # 正常输出
                                        answer = data.get("answer", "")
                                        if isinstance(answer, str):
                                            answer_str += answer

                                        elif isinstance(answer, dict):
                                            logger.error("未知数据体：0---------------------------------")
                                            logger.error(answer)
                                            answer_str += answer.get("action_input", "")

                                        result = {"message": answer_str, "type": "message"}
                                elif data.get("event") == "message_end":
                                    result = {"message": answer_str, "type": "close"}
                                    try:
                                        SessionService(db).update_session(chat_id,
                                                                          message={"role": "assistant", "content": data, "conversation_id": data.get("conversation_id")})
                                    except Exception as e:
                                        logger.error("保存dify的会话异常！")
                                        logger.error(e)
                                elif data.get("event") == "message_file":
                                    url = data.get("url", "")
                                    result = {"message": url, "type": "image"}
                                else:
                                    continue
                                await websocket.send_json(result)
                                complete_response = ""
                            except json.JSONDecodeError as e:
                                print(f"Error decoding JSON: {e}")
                                # print(f"Response text: {text}")
                        except Exception as e2:
                            result = {"message": f"内部错误： {e2}", "type": "close"}
                            await websocket.send_json(result)
                            print(f"Error process message of ragflow: {e2}")


            # 启动任务处理客户端消息
            tasks = [
                asyncio.create_task(forward_to_dify())
            ]
            await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
        except WebSocketDisconnect as e1:
            print(f"Client {chat_id} disconnected: {e1}")
            await websocket.close()
        except Exception as e:
            print(f"Exception occurred: {e}")

        finally:
            print("Cleaning up resources of ragflow")
            # 取消所有任务
            for task in tasks:
                if not task.done():
                    task.cancel()
                    try:
                        await task
                    except asyncio.CancelledError:
                        pass
    else:
        ret = {"message": "Agent not found", "type": "close"}
        await websocket.send_json(ret)