python 实现OPCUA server

需要用到的库
pip install opcua

直接上代码

# encoding=utf-8

from opcua import ua, Server
from loguru import logger
from json_config import JsonConf
from datetime import datetime

class myObject():
    def __init__(self,server,name,groups,quantity):
        self.server = server
        self.name = name
        self.groups = groups
        self.quantity = int(quantity)
        self.Nodes = {}
        self.create_Node()

    def create_Node(self):

        objects = server.get_objects_node()
        # populating our address space
        myobj = objects.add_object(idx, self.name)
        for ID in self.groups:
            self.Nodes[str(ID)] = []
            subobj = myobj.add_object(idx, str(ID))
            for addr in range(0,self.quantity):
                myvar = subobj.add_variable(idx, str(addr), 0)
                myvar.set_writable()
                self.Nodes[str(ID)].append(myvar)

        # myvar = myobj.add_variable(idx, "MyVariable", 6.7)
        # myvar.set_writable()  # Set MyVariable to be writable by clients
        #t1 = threading.Thread(target=self.set_val)  # 创建线程
        #t1.setDaemon(True)  # 设置为后台线程，这里默认是False，设置为True之后则主线程不用等待子线程
        #t1.start()  # 开启线程

        # for ID in self.groups:
        #     try:
        #         for addr in range(0, self.quantity):
        #
        #             datavalue = ua.DataValue(0)
        #             date_time = datetime.strptime('2021-01-01 00:00:00', '%Y-%m-%d %H:%M:%S')
        #             datavalue.SourceTimestamp = date_time
        #         # tag.set_value(datavalue)
        #             self.Nodes[str(ID)][addr].set_value(datavalue)
        #             self.Nodes[str(ID)][addr].set_value(0)
        #     except Exception as e:
        #         logger.info('{},{},{}'.format(self.name, ID, e))

if __name__ == "__main__":

    # setup our server
    server = Server()
    server.set_endpoint("opc.tcp://0.0.0.0:48408/freeopcua/server/")
    # setup our own namespace, not really necessary but should as spec
    # uri = "http://examples.freeopcua.github.io"
    uri = "WBOPC_UA"
    idx = server.register_namespace(uri)

    config_json = JsonConf.load()
    # print(config_json)
    for user in config_json['OPC_UA_Server']:
        my_obj = myObject(server, user["name"],  user["groups"],user["quantity"])

    server.start()

这里为了方便可配置测点结构和数量补充下json_config.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'''
json配置文件类，调用方法
data_dict = {"a":"1", "b":"2"}
JsonConf.set(data_dict)
即可在当前目录下生成json文件：config.json
'''
import json
import os

class JsonConf:
    '''json配置文件类'''

    @staticmethod
    def store(data):
        with open("config.json", 'w') as json_file:
            json_file.write(json.dumps(data, indent=4))

    @staticmethod
    def load():
        if not os.path.exists('config.json'):
            with open("config.json", 'w') as json_file:
                pass
        with open('config.json',encoding='utf-8') as json_file:
            try:
                data = json.load(json_file)
            except Exception as e:
                print(e)
                data = {}
            return data

    @staticmethod
    def set(data_dict):
        json_obj = JsonConf.load()
        for key in data_dict:
            json_obj[key] = data_dict[key]
        JsonConf.store(json_obj)
        json.dumps(json_obj, indent=4)


# if __name__ == "__main__":
#     # data = {"a": "1", "f": "100", "b": "3000"}
#     # JsonConf.set(data)
#     print(JsonConf.load())

附上测试配置文件 config.json：

{
    "OPC_UA_Server": [
        {"name": "test","groups": [1,2,3,4,5,6,7,8,9,10],"quantity": 100},
        {"name": "user1","groups": [1,2,3,4,5,6,7,8,9,10],"quantity": 100},
        {"name": "user2","groups": [1,2,3,4,5,6,7,8,9,10],"quantity": 100},
    {"name": "user3","groups": [1,2,3,4,5,6,7,8,9,10],"quantity": 100}
    ]
}