lot_manager/video_task.py

import websockets
import asyncio
import json

import paho.mqtt.client as mqtt
from pydantic import BaseModel


class BaseResponse(BaseModel):
    code: int = 200
    msg: str = "success"


class MQTTClient:
    def __init__(self, broker, port, topic, username, password):
        self.broker = broker
        self.port = port
        self.topic = topic
        self.username = username
        self.password = password
        # 千万不要指定client_id 不然死翘翘
        self.client = mqtt.Client()
        self.client.username_pw_set(self.username, self.password)

    def push(self):
        self.client.publish(self.topic, payload=json.dumps({"msg": "open_led"}, ensure_ascii=False),
                            qos=0)
        self.client.publish(self.topic, payload=json.dumps({"msg": "push_stream"}, ensure_ascii=False),
                            qos=0)

    def close(self):
        self.client.publish(self.topic, payload=json.dumps({"msg": "close_stream"}, ensure_ascii=False),
                            qos=0)
        self.client.publish(self.topic, payload=json.dumps({"msg": "close_led"}, ensure_ascii=False),
                            qos=0)

    def start(self):
        self.client.connect(self.broker, self.port)


async def close(username, device):
    # 倒计时600秒
    await asyncio.sleep(30)
    print(username + "结束推流")
    user_sched.pop(username)
    close_stream(username, device)


async def task_start(username, device):
    print(username + "创建结束推流定时任务")
    task = asyncio.create_task(close(username, device))
    user_sched[username] = task


async def start(username, device):
    try:
        # 如果定时任务不存在，那么直接进行推流。当用户退出界面时，创建任务
        if username not in user_sched:
            print(username + "开始推流")
            push_stream(username, device)
        # 如果定时任务存在，那么取消上次的任务。当用户退出界面时，创建任务
        else:
            t = user_sched[username]
            # 取消任务
            if t is not None:
                print(username + "取消定时任务")
                t.cancel()
        return BaseResponse(code=200, msg="success").json()
    except Exception as e:
        return BaseResponse(code=500, msg=str(e)).json()


async def stop(username, device):
    try:
        await task_start(username, device)
        return BaseResponse(code=200, msg="success").json()
    except Exception as e:
        return BaseResponse(code=500, msg=str(e)).json()


def push_stream(username, device):
    MQTT = MQTTClient(broker, port, device, username, username)
    MQTT.start()
    MQTT.push()


def close_stream(username, device):
    MQTT = MQTTClient(broker, port, device, username, username)
    MQTT.start()
    MQTT.close()


# 定义函数A
async def function_A(client, data):
    data = json.loads(data)
    username = data['username']
    device = data['device']
    # print("A", username, device)
    return await start(username, device)


# 定义函数B
async def function_B(client, data):
    data = json.loads(data)
    username = data['username']
    device = data['device']
    # print("B", username, device)
    print(f"{client}的连接已断开")
    await stop(username, device)


class Scene:
    def __init__(self, user):
        self.user = user
        self.active = False

    def turn_on(self):
        self.active = True

    def turn_off(self):
        self.active = False


class AppScene(Scene):
    def __init__(self, user):
        super().__init__(user)
        self.name = "app"


class WebScene(Scene):
    def __init__(self, user):
        super().__init__(user)
        self.name = "web"


class ScreenScene(Scene):
    def __init__(self, user):
        super().__init__(user)
        self.name = "screen"


class SceneManager:
    def __init__(self):
        self.users = {}

    def add_user(self, user):
        # 上锁
        if user not in self.users:
            print("创建user" + user)
            self.users[user] = {"app": AppScene(user), "web": WebScene(user), "screen": ScreenScene(user)}

    def get_scene(self, user, scene_type):
        return self.users[user].get(scene_type)


async def handler(websocket, path):
    the_user_scene = None
    user_app_scene = None
    user_web_scene = None
    user_screen_scene = None
    try:
        # 在循环中等待客户端的消息
        async for message in websocket:
            user_msg[websocket] = message
            data = json.loads(message)
            username = data['username']
            scene_name = data[SCENE_NAME]
            scene_manager.add_user(username)
            the_user_scene = scene_manager.get_scene(username, scene_name)
            if the_user_scene.active is True:
                await websocket.send(
                    json.dumps({"code": 200,
                                "msg": the_user_scene.user + "的" + the_user_scene.name + "该场景已经开启了，不要再请求我了！"},
                               ensure_ascii=False))
                continue
            user_app_scene = scene_manager.get_scene(username, "app")
            user_web_scene = scene_manager.get_scene(username, "web")
            user_screen_scene = scene_manager.get_scene(username, "screen")
            if user_app_scene.active is True or user_web_scene.active is True or user_screen_scene.active is True:
                the_user_scene.turn_on()
                await websocket.send(
                    json.dumps({"code": 200, "msg": "该用户已经有其他场景开启了，不需要再推流了！"}, ensure_ascii=False))
                continue
            # 如果该用户的场景没有开启，那么进行开启
            the_user_scene.turn_on()
            await websocket.send(
                json.dumps({"code": 200, "msg": the_user_scene.user + "开启场景" + the_user_scene.name},
                           ensure_ascii=False))
            # 当接收到消息时调用函数A
            response = await function_A(websocket, message)
            await websocket.send(response)
        # 没有消息了，则首先关闭该用户的场景
        if the_user_scene is not None:
            the_user_scene.turn_off()
        # 查看该用户的所有场景是否在线,只有都不在线就关闭推流
        if user_app_scene is not None and user_app_scene is not None and user_app_scene is not None:
            if user_app_scene.active is False and user_web_scene.active is False and user_screen_scene.active is False:
                print("关闭场景" + the_user_scene.name)
                await function_B(websocket, user_msg[websocket])
    except Exception as e:
        print(e)
        pass
        # # 没有消息了，则首先关闭该用户的场景
        if the_user_scene is not None:
            the_user_scene.turn_off()
        # 查看该用户的所有场景是否在线,只有都不在线就关闭推流
        if user_app_scene is not None and user_app_scene is not None and user_app_scene is not None:
            if user_app_scene.active is False and user_web_scene.active is False and user_screen_scene.active is False:
                print("关闭场景" + the_user_scene.name)
                await function_B(websocket, user_msg[websocket])


if __name__ == '__main__':
    broker = 'mqtt.lihaink.cn'
    port = 1883
    SCENE_NAME = "scene"
    user_sched = {}
    user_msg = {}
    user_scene = []
    scene_manager = SceneManager()
    # 启动WebSocket服务器
    start_server = websockets.serve(handler, "0.0.0.0", 8765)

    asyncio.get_event_loop().run_until_complete(start_server)
    asyncio.get_event_loop().run_forever()