video/ws/ws.py

import asyncio
import datetime
import json
import os
from contextlib import asynccontextmanager
from typing import Dict, Optional
from service.device_service import update_online_status_by_ip, increment_alarm_count_by_ip
from service.device_action_service import add_device_action
from schema.device_action_schema import DeviceActionCreate
from core.all import detect, load_model

import cv2
import numpy as np
from fastapi import WebSocket, APIRouter, WebSocketDisconnect, FastAPI

# 配置常量
HEARTBEAT_INTERVAL = 30  # 心跳检查间隔（秒）
HEARTBEAT_TIMEOUT = 600  # 客户端超时阈值（秒）
WS_ENDPOINT = "/ws"  # WebSocket端点路径
FRAME_QUEUE_SIZE = 1  # 帧队列大小限制


# 工具函数: 获取格式化时间字符串
def get_current_time_str() -> str:
    return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")


def get_current_time_file_str() -> str:
    return datetime.datetime.now().strftime("%Y%m%d_%H%M%S_%f")


# 客户端连接封装
class ClientConnection:
    def __init__(self, websocket: WebSocket, client_ip: str):
        self.websocket = websocket
        self.client_ip = client_ip  # 已初始化客户端IP，用于传递给detect
        self.last_heartbeat = datetime.datetime.now()
        self.frame_queue = asyncio.Queue(maxsize=FRAME_QUEUE_SIZE)
        self.consumer_task: Optional[asyncio.Task] = None

    def update_heartbeat(self):
        """更新心跳时间"""
        self.last_heartbeat = datetime.datetime.now()

    def is_alive(self) -> bool:
        """判断客户端是否存活"""
        timeout_seconds = (datetime.datetime.now() - self.last_heartbeat).total_seconds()
        return timeout_seconds < HEARTBEAT_TIMEOUT

    def start_consumer(self):
        """启动帧消费任务"""
        self.consumer_task = asyncio.create_task(self.consume_frames())
        return self.consumer_task

    async def send_frame_permit(self):
        """发送帧发送许可信号"""
        try:
            frame_permit_msg = {
                "type": "frame",
                "timestamp": get_current_time_str(),
                "client_ip": self.client_ip
            }
            await self.websocket.send_json(frame_permit_msg)
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 已发送帧发送许可信号")
        except Exception as e:
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 帧许可信号发送失败 - {str(e)}")

    async def consume_frames(self) -> None:
        """消费队列中的帧并处理"""
        try:
            while True:
                # 取出帧并立即发送下一帧许可
                frame_data = await self.frame_queue.get()
                await self.send_frame_permit()

                try:
                    await self.process_frame(frame_data)
                finally:
                    self.frame_queue.task_done()

        except asyncio.CancelledError:
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 帧消费任务已取消")
        except Exception as e:
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 帧消费逻辑错误 - {str(e)}")

    async def process_frame(self, frame_data: bytes) -> None:
        """处理单帧图像数据（核心修改：detect函数传入 client_ip + img 双参数）"""
        # 二进制转OpenCV图像
        nparr = np.frombuffer(frame_data, np.uint8)
        img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
        if img is None:
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 无法解析图像数据")
            return

        try:
            # -------------------------- 核心修改：按要求传入参数（1.client_ip 2.img） --------------------------
            # detect函数参数顺序：第一个为client_ip，第二个为图像数据img
            # 保持返回值解包（是否违规, 结果数据, 检测器类型）不变
            has_violation, data, detector_type = await asyncio.to_thread(
                detect,                  # 调用检测函数
                self.client_ip,          # 第一个参数：客户端IP（新增，按需求顺序）
                img                      # 第二个参数：图像数据（原参数，调整顺序）
            )
            # -------------------------------------------------------------------------------------

            # 打印检测结果（包含客户端IP，与传入参数对应）
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 检测结果 - "
                  f"违规: {has_violation}, 类型: {detector_type}, 数据: {data}")

            # 处理违规逻辑（逻辑不变，基于detect返回结果执行）
            if has_violation:
                print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 检测到违规 - "
                      f"类型: {detector_type}, 详情: {data}")

                # 违规次数+1
                try:
                    await asyncio.to_thread(increment_alarm_count_by_ip, self.client_ip)
                    print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 违规次数已+1")
                except Exception as e:
                    print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 违规次数更新失败 - {str(e)}")

                # 发送危险通知
                danger_msg = {
                    "type": "danger",
                    "timestamp": get_current_time_str(),
                    "client_ip": self.client_ip,
                    "detail": data
                }
                await self.websocket.send_json(danger_msg)
            else:
                print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 未检测到违规")

        except Exception as e:
            print(f"[{get_current_time_str()}] 客户端{self.client_ip}: 图像处理错误 - {str(e)}")


# 全局状态管理
connected_clients: Dict[str, ClientConnection] = {}
heartbeat_task: Optional[asyncio.Task] = None


# 心跳检查任务
async def heartbeat_checker():
    while True:
        current_time = get_current_time_str()
        timeout_ips = [ip for ip, conn in connected_clients.items() if not conn.is_alive()]

        if timeout_ips:
            print(f"[{current_time}] 心跳检查: {len(timeout_ips)}个客户端超时（IP: {timeout_ips}）")
            for ip in timeout_ips:
                try:
                    conn = connected_clients[ip]
                    if conn.consumer_task and not conn.consumer_task.done():
                        conn.consumer_task.cancel()
                    await conn.websocket.close(code=1008, reason="心跳超时")

                    # 标记离线
                    try:
                        await asyncio.to_thread(update_online_status_by_ip, ip, 0)
                        action_data = DeviceActionCreate(client_ip=ip, action=0)
                        await asyncio.to_thread(add_device_action, action_data)
                        print(f"[{current_time}] 客户端{ip}: 已标记为离线并记录操作")
                    except Exception as e:
                        print(f"[{current_time}] 客户端{ip}: 离线状态更新失败 - {str(e)}")
                finally:
                    connected_clients.pop(ip, None)
        else:
            print(f"[{current_time}] 心跳检查: {len(connected_clients)}个客户端在线")

        await asyncio.sleep(HEARTBEAT_INTERVAL)


# 应用生命周期管理
@asynccontextmanager
async def lifespan(app: FastAPI):
    global heartbeat_task
    heartbeat_task = asyncio.create_task(heartbeat_checker())
    print(f"[{get_current_time_str()}] 全局心跳检查任务启动（任务ID: {id(heartbeat_task)}）")
    yield
    if heartbeat_task and not heartbeat_task.done():
        heartbeat_task.cancel()
        try:
            await heartbeat_task
            print(f"[{get_current_time_str()}] 全局心跳检查任务已取消")
        except asyncio.CancelledError:
            pass


# 消息处理工具函数
async def send_heartbeat_ack(conn: ClientConnection):
    try:
        heartbeat_ack_msg = {
            "type": "heart",
            "timestamp": get_current_time_str(),
            "client_ip": conn.client_ip
        }
        await conn.websocket.send_json(heartbeat_ack_msg)
        print(f"[{get_current_time_str()}] 客户端{conn.client_ip}: 已发送心跳确认")
        return True
    except Exception as e:
        connected_clients.pop(conn.client_ip, None)
        print(f"[{get_current_time_str()}] 客户端{conn.client_ip}: 心跳确认发送失败 - {str(e)}")
        return False


async def handle_text_msg(conn: ClientConnection, text: str):
    try:
        msg = json.loads(text)
        if msg.get("type") == "heart":
            conn.update_heartbeat()
            await send_heartbeat_ack(conn)
        else:
            print(f"[{get_current_time_str()}] 客户端{conn.client_ip}: 未知文本消息类型（{msg.get('type')}）")
    except json.JSONDecodeError:
        print(f"[{get_current_time_str()}] 客户端{conn.client_ip}: 无效JSON文本消息")


async def handle_binary_msg(conn: ClientConnection, data: bytes):
    try:
        conn.frame_queue.put_nowait(data)
        print(f"[{get_current_time_str()}] 客户端{conn.client_ip}: 图像数据（{len(data)}字节）已加入队列")
    except asyncio.QueueFull:
        print(f"[{get_current_time_str()}] 客户端{conn.client_ip}: 帧队列已满、丢弃当前图像数据")


# WebSocket路由配置
ws_router = APIRouter()


@ws_router.websocket(WS_ENDPOINT)
async def websocket_endpoint(websocket: WebSocket):
    load_model()  # 加载检测模型（仅在连接建立时加载一次，避免重复加载）
    await websocket.accept()
    client_ip = websocket.client.host if websocket.client else "unknown_ip"
    current_time = get_current_time_str()
    print(f"[{current_time}] 客户端{client_ip}: WebSocket连接已建立")

    is_online_updated = False

    try:
        # 处理重复连接（同一IP断开旧连接）
        if client_ip in connected_clients:
            old_conn = connected_clients[client_ip]
            if old_conn.consumer_task and not old_conn.consumer_task.done():
                old_conn.consumer_task.cancel()
            await old_conn.websocket.close(code=1008, reason="同一IP新连接建立")
            connected_clients.pop(client_ip)
            print(f"[{current_time}] 客户端{client_ip}: 已关闭旧连接")

        # 注册新连接（绑定client_ip和WebSocket）
        new_conn = ClientConnection(websocket, client_ip)
        connected_clients[client_ip] = new_conn
        new_conn.start_consumer()  # 启动帧消费任务
        await new_conn.send_frame_permit()  # 发送首次帧许可

        # 标记客户端上线
        try:
            await asyncio.to_thread(update_online_status_by_ip, client_ip, 1)
            action_data = DeviceActionCreate(client_ip=client_ip, action=1)
            await asyncio.to_thread(add_device_action, action_data)
            print(f"[{current_time}] 客户端{client_ip}: 已标记为在线并记录操作")
            is_online_updated = True
        except Exception as e:
            print(f"[{current_time}] 客户端{client_ip}: 上线状态更新失败 - {str(e)}")

        print(f"[{current_time}] 客户端{client_ip}: 新连接注册成功、在线数: {len(connected_clients)}")

        # 消息循环（持续接收客户端消息）
        while True:
            data = await websocket.receive()
            if "text" in data:
                await handle_text_msg(new_conn, data["text"])
            elif "bytes" in data:
                await handle_binary_msg(new_conn, data["bytes"])

    except WebSocketDisconnect as e:
        print(f"[{get_current_time_str()}] 客户端{client_ip}: 主动断开连接（代码: {e.code}）")
    except Exception as e:
        print(f"[{get_current_time_str()}] 客户端{client_ip}: 连接异常 - {str(e)[:50]}")
    finally:
        # 清理资源（断开后标记离线+删除连接）
        if client_ip in connected_clients:
            conn = connected_clients[client_ip]
            if conn.consumer_task and not conn.consumer_task.done():
                conn.consumer_task.cancel()

            # 仅当上线状态更新成功时，才执行离线更新
            if is_online_updated:
                try:
                    await asyncio.to_thread(update_online_status_by_ip, client_ip, 0)
                    action_data = DeviceActionCreate(client_ip=client_ip, action=0)
                    await asyncio.to_thread(add_device_action, action_data)
                    print(f"[{get_current_time_str()}] 客户端{client_ip}: 断开后已标记为离线")
                except Exception as e:
                    print(f"[{get_current_time_str()}] 客户端{client_ip}: 断开后离线更新失败 - {str(e)}")

            connected_clients.pop(client_ip, None)
        print(f"[{get_current_time_str()}] 客户端{client_ip}: 资源已清理、在线数: {len(connected_clients)}")