lot_manager/MQTT.py

import json
import subprocess
import time

import paho.mqtt.client as mqtt

from src.tool import push_stream, close_stream, update, exec_sh, get_record, get_list_record, get_status


def on_connect(client, userdata, flags, rc):
    if rc == 0:
        client.subscribe('lot_mqtt')


def valid(msg, client):
    origin_data = json.loads(msg.payload.decode('utf-8'))
    if 'msg' not in origin_data:
        client.publish('error', payload='msg must be supplied', qos=0)
        return False
    if 'device_name' not in origin_data:
        client.publish('error', payload='device_name must be supplied', qos=0)
        return False
    if device_name != origin_data['device_name']:
        return False
    return True


# Message receiving callback
def on_message(client, userdata, msg):
    if not valid(msg, client):
        client.publish('error', payload='验证失败', qos=0)
        return
    client.publish('success', payload='验证通过', qos=0)
    try:
        origin_data = json.loads(msg.payload.decode('utf-8'))
        data = origin_data["msg"]
        if data == "push_stream":
            # 启动推流视频
            push_stream(client)
        elif data == "close_stream":
            # 关闭推流视频
            close_stream(client)
        elif data == "exec":
            #  执行命令
            exec_sh(msg, client)
        elif data == "update":
            #  git更新项目和配置文件
            update(client)
        elif data == "record_list":
            # 查看录像列表
            get_list_record()
        elif data == "record":
            # 获取录像
            get_record(msg, client)
        elif data == "status":
            # 查看运行状态
            get_status(client)
        else:
            # 错误类型
            client.publish('error', payload='No Such Type', qos=0)
    except Exception as e:
        pass


times = 120


def exec_shutdown():
    pass


if __name__ == '__main__':
    p = subprocess.Popen(['cat /home/pi/device_name'], shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()
    device_name = out.decode('utf-8').strip()
    while True:
        try:
            client = mqtt.Client(client_id=device_name)
            client.username_pw_set("demo", "123456")
            # Specify callback function
            client.on_connect = on_connect
            client.on_message = on_message
            # Establish a connection
            # ceshi-mqtt.lihaink.cn
            client.connect('ceshi-mqtt.lihaink.cn', 1883)
            # Publish a message
            client.loop_forever()
        except:
            print("等待30秒连接")
            time.sleep(30)
            if times == 0:
                # 重启机器
                exec_shutdown()
            times -= 1