lot_manager/video_task.py

import uvicorn
from fastapi import FastAPI, WebSocket

import requests
import asyncio
import json

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

app = FastAPI()


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:
            res = requests.get(rtsp_MediaInfo + device)
            if res.status_code != 200:
                return BaseResponse(code=500, msg="ZLMediakit Server Error!").json()
            # 转换为json
            res = res.json()
            if 'code' in res and res['code'] == 0:
                return BaseResponse(code=200, msg=username + ",Do not repeat push stream").json()
            # 开始推流
            get_times = 50
            # 启动推流程序
            print(username + "开始推流")
            push_stream(username, device)
            # 查看请求 ，ZLMediakit是否已经生成了mp4文件,生成了就给前端返回
            while True:
                res = requests.get(rtsp_MediaInfo + device)
                if res.status_code != 200:
                    return BaseResponse(code=200, msg="ZLMediakit Server Error!").json()
                # 转换为json
                res = res.json()
                if 'code' in res and res['code'] == 0:
                    # code == 0 说明已经启动成功
                    break
                # 如果都没有code，那就出错了
                if 'code' not in res:
                    return BaseResponse(code=500, msg="ZLMediakit Server Error!").json()
                get_times -= 1
                if get_times == 0:
                    # 请求次数达到50次就退了吧
                    return BaseResponse(code=500, msg="ZLMediakit Server Error!").json()
                await asyncio.sleep(1)
            return BaseResponse(code=200, msg="success").json()
        # 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()
            else:
                BaseResponse(code=500, msg="Internal Error").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(data):
    data = json.loads(data)
    username = data['username']
    device = data['device']
    return await start(username, device)


# 定义函数B
async def function_B(data):
    data = json.loads(data)
    username = data['username']
    device = data['device']
    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:
            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 on_connect(ws: WebSocket):
    await ws.send_text(json.dumps({"code": 201, "msg": "socket已连接，等待接收消息"}, ensure_ascii=False))


async def on_disconnect(the_user_scene, user_app_scene, user_web_scene, user_screen_scene, message):
    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(message)


@app.websocket("/")
async def wsk(ws: WebSocket):
    the_user_scene = None
    user_app_scene = None
    user_web_scene = None
    user_screen_scene = None
    username = ""
    await ws.accept()
    await on_connect(ws)
    try:
        while True:
            message = await ws.receive_text()
            await ws.send_text(json.dumps({"code": 202, "msg": "socket已收到消息，等待处理"}, ensure_ascii=False))
            user_msg[ws] = 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 ws.send_text(
                    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,请等待一会！"},
                               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 ws.send_text(
                    json.dumps({"code": 200, "msg": "该用户已经有其他场景开启了，请等待一会！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
            print(username + "开启场景" + the_user_scene.name)
            the_user_scene.turn_on()
            response = await function_A(message)
            # 当接收到消息时调用函数A
            await ws.send_text(response)
    except Exception as e:
        print(f"{username}的{the_user_scene.name}场景的连接已断开,异常消息或代码：{e}")
        await on_disconnect(the_user_scene, user_app_scene, user_web_scene, user_screen_scene, user_msg[ws])

if __name__ == '__main__':
    broker = 'mqtt.lihaink.cn'
    port = 1883
    rtsp_MediaInfo = "http://rtsp.lihaink.cn/index/api/getMediaInfo?secret=YwDtp2llj80HA19JhMXL4Po99nsMAyNT&schema=rtsp&vhost=__defaultVhost__&app=live&stream="
    SCENE_NAME = "scene"
    user_sched = {}
    user_msg = {}
    user_scene = []
    scene_manager = SceneManager()
    uvicorn.run(app, host="0.0.0.0", port=8765)