python_opc_api/get_opc_data.py

import redis
import logging
from asyncua import Client
from datetime import datetime
from get_config import get_conf


# 连接redis服务
def get_redis_conn():
    # 获取配置
    config = get_conf()
    # 创建redis对象
    try:
        redis_conf = config['redis_conf']
        redis_ip = redis_conf['ip']
        pool = redis.ConnectionPool(host=redis_ip, password='')
        redis_conn = redis.Redis(connection_pool=pool)
    except BaseException as e:
        print(e)
        print("异常，redis连接错误！")
    return redis_conn


# 根据服务、和点位获取OPC数据
async def get_opc_data(sys_url, point_arr, ns=2):
    if sys_url is None or point_arr is None:
        return
    # 获取配置
    # config = get_conf()
    # 获取redis
    redis_conn = get_redis_conn()

    # 连接opc服务
    try:
        print("正在连接OPCUA服务...")
        async with Client(url=sys_url) as client:
            i = 0
            result_arr = {}
            print(datetime.now().strftime('Start_time:%Y-%m-%d %H:%M:%S.%f'))
            while i < len(point_arr):
                try:
                    node = f"ns={ns};s={point_arr[i]}"
                    tag = client.get_node(node)
                    value = await tag.read_value()
                    # redis值
                    redis_conn.set(str(point_arr[i]), str(value))
                    arr_key = node.split("=")
                    result_arr[arr_key[2]] = value
                finally:
                    i += 1
                    continue
            print(datetime.now().strftime('End_time:%Y-%m-%d %H:%M:%S.%f'))
            return result_arr
    except KeyError as e:
        # logging.warning(e.args)
        logging.warning("服务连接错误！")
        return "服务连接错误！"
    except BaseException as e:
        print(e)
        return "服务连接错误！"


# 将点位值赋予json（递归，适配多级json）
def point_data_to_arr(point_data, data_arr=[]):
    # 未获取到值返回空数组
    if len(data_arr) == 0:
        return point_data

    point_dict = {}
    if isinstance(point_data, dict):
        for key, val in point_data.items():
            data = point_data[key]
            if 'val' == key:
                point_key = point_dict['key']
                if point_key in data_arr:
                    point_dict['val'] = data_arr[point_key]
                else:
                    point_dict['val'] = ""
            elif isinstance(val, str):
                point_dict[key] = point_data[key]
            else:
                test = point_data_to_arr(data, data_arr)
                point_dict[key] = test
    elif isinstance(point_data, list):
        point_arr = []
        for i in range(len(point_data)):
            data = point_data[i]
            data_dic = point_data_to_arr(data, data_arr)
            point_arr.append(data_dic)
            # point_arr[i] =
        return point_arr

    return point_dict