assist/src/web/websocket_server.py

# -*- coding: utf-8 -*-
"""
WebSocket实时通信服务器
提供实时对话功能
"""

import asyncio
import json
import logging
from datetime import datetime
from typing import Dict, Set
import websockets
from websockets.server import WebSocketServerProtocol

from ..dialogue.realtime_chat import RealtimeChatManager

logger = logging.getLogger(__name__)

class WebSocketServer:
    """WebSocket服务器"""

    def __init__(self, host: str = "localhost", port: int = 8765):
        self.host = host
        self.port = port
        self.chat_manager = RealtimeChatManager()
        self.connected_clients: Set[WebSocketServerProtocol] = set()

    async def register_client(self, websocket: WebSocketServerProtocol):
        """注册客户端"""
        self.connected_clients.add(websocket)
        logger.info(f"客户端连接: {websocket.remote_address}")

    async def unregister_client(self, websocket: WebSocketServerProtocol):
        """注销客户端"""
        self.connected_clients.discard(websocket)
        logger.info(f"客户端断开: {websocket.remote_address}")

    async def handle_message(self, websocket: WebSocketServerProtocol, message: str):
        """处理客户端消息"""
        try:
            data = json.loads(message)
            message_type = data.get("type")
            message_id = data.get("messageId")  # 获取消息ID

            if message_type == "create_session":
                await self._handle_create_session(websocket, data, message_id)
            elif message_type == "send_message":
                await self._handle_send_message(websocket, data, message_id)
            elif message_type == "get_history":
                await self._handle_get_history(websocket, data, message_id)
            elif message_type == "create_work_order":
                await self._handle_create_work_order(websocket, data, message_id)
            elif message_type == "get_work_order_status":
                await self._handle_get_work_order_status(websocket, data, message_id)
            elif message_type == "end_session":
                await self._handle_end_session(websocket, data, message_id)
            else:
                await self._send_error(websocket, "未知消息类型", message_id)

        except json.JSONDecodeError:
            await self._send_error(websocket, "JSON格式错误")
        except Exception as e:
            logger.error(f"处理消息失败: {e}")
            await self._send_error(websocket, f"处理消息失败: {str(e)}")

    async def _handle_create_session(self, websocket: WebSocketServerProtocol, data: Dict, message_id: str = None):
        """处理创建会话请求"""
        user_id = data.get("user_id", "anonymous")
        work_order_id = data.get("work_order_id")

        session_id = self.chat_manager.create_session(user_id, work_order_id)

        response = {
            "type": "session_created",
            "session_id": session_id,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def _handle_send_message(self, websocket: WebSocketServerProtocol, data: Dict, message_id: str = None):
        """处理发送消息请求"""
        session_id = data.get("session_id")
        message = data.get("message")

        if not session_id or not message:
            await self._send_error(websocket, "缺少必要参数", message_id)
            return

        # 获取客户端IP
        ip_address = None
        try:
            # websockets 15.x 获取 remote_address 的方式
            ip_address = websocket.remote_address[0] if websocket.remote_address else None
        except Exception:
            pass

        # 处理消息
        result = self.chat_manager.process_message(
            session_id,
            message,
            ip_address=ip_address,
            invocation_method="websocket"
        )

        response = {
            "type": "message_response",
            "session_id": session_id,
            "result": result,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def _handle_get_history(self, websocket: WebSocketServerProtocol, data: Dict, message_id: str = None):
        """处理获取历史记录请求"""
        session_id = data.get("session_id")

        if not session_id:
            await self._send_error(websocket, "缺少会话ID", message_id)
            return

        history = self.chat_manager.get_session_history(session_id)

        response = {
            "type": "history_response",
            "session_id": session_id,
            "history": history,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def _handle_create_work_order(self, websocket: WebSocketServerProtocol, data: Dict, message_id: str = None):
        """处理创建工单请求"""
        session_id = data.get("session_id")
        title = data.get("title")
        description = data.get("description")
        category = data.get("category", "技术问题")
        priority = data.get("priority", "medium")

        if not session_id or not title or not description:
            await self._send_error(websocket, "缺少必要参数", message_id)
            return

        result = self.chat_manager.create_work_order(session_id, title, description, category, priority)

        response = {
            "type": "work_order_created",
            "session_id": session_id,
            "result": result,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def _handle_get_work_order_status(self, websocket: WebSocketServerProtocol, data: Dict, message_id: str = None):
        """处理获取工单状态请求"""
        work_order_id = data.get("work_order_id")

        if not work_order_id:
            await self._send_error(websocket, "缺少工单ID", message_id)
            return

        result = self.chat_manager.get_work_order_status(work_order_id)

        response = {
            "type": "work_order_status",
            "work_order_id": work_order_id,
            "result": result,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def _handle_end_session(self, websocket: WebSocketServerProtocol, data: Dict, message_id: str = None):
        """处理结束会话请求"""
        session_id = data.get("session_id")

        if not session_id:
            await self._send_error(websocket, "缺少会话ID", message_id)
            return

        success = self.chat_manager.end_session(session_id)

        response = {
            "type": "session_ended",
            "session_id": session_id,
            "success": success,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def _send_error(self, websocket: WebSocketServerProtocol, error_message: str, message_id: str = None):
        """发送错误消息"""
        response = {
            "type": "error",
            "message": error_message,
            "timestamp": datetime.now().isoformat()
        }

        if message_id:
            response["messageId"] = message_id

        await websocket.send(json.dumps(response, ensure_ascii=False))

    async def handle_client(self, websocket):
        """处理客户端连接（兼容 websockets 15.x）"""
        # websockets 15.x 版本中，handler 只接收 websocket 参数，不再有 path 参数
        await self.register_client(websocket)

        try:
            async for message in websocket:
                await self.handle_message(websocket, message)
        except websockets.exceptions.ConnectionClosed:
            pass
        except Exception as e:
            logger.error(f"WebSocket连接错误: {e}")
        finally:
            await self.unregister_client(websocket)

    async def start_server(self):
        """启动WebSocket服务器（兼容 websockets 15.x）"""
        logger.info(f"启动WebSocket服务器: ws://{self.host}:{self.port}")

        # websockets 15.x 简化版本：直接传递处理函数
        async with websockets.serve(
            self.handle_client,
            self.host,
            self.port
        ):
            await asyncio.Future()  # 保持服务器运行

    def run(self):
        """运行服务器"""
        asyncio.run(self.start_server())

if __name__ == "__main__":
    # 设置日志
    logging.basicConfig(level=logging.INFO)

    # 启动服务器
    server = WebSocketServer()
    server.run()