物联网平台组件2： 平台校验规则

加载不通的规则引擎配置文件，使用DynamicExpresso校验采集数据，得出是否告警

 

 

rules.json

{
  "Rules": [
    {
      "Description": "温度超过阈值警报",
      "Condition": "temperature > 30",
      "Action": "HT"
    },
    {
      "Description": "湿度低于阈值警报",
      "Condition": "humidity < 20",
      "Action": "LH"
    },
    {
      "Description": "温度和湿度都正常",
      "Condition": "temperature <= 30 AND humidity >= 20",
      "Action": "THN"
    }
  ]
} 

RuleMgr.cs

using DynamicExpresso;
using System.Text.Json;

namespace ConfigRules
{
    // 用于存储来自 JSON 文件的规则  
    public class Rule
    {
        public string Description { get; set; }
        public string Condition { get; set; }
        public string Action { get; set; }
    }

    public class RuleSet
    {
        public List<Rule> Rules { get; set; }
    }

    public class RuleMgr
    {
        static List<Rule> rules;

        public static void LoadConfig(string filePath)
        {
            try
            {
                var jsonString = File.ReadAllText(filePath);
                var ruleSet = JsonSerializer.Deserialize<RuleSet>(jsonString);
                rules = ruleSet?.Rules ?? new List<Rule>();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"[Error] RuleMgr,LoadConfig,errmsg:{ex.Message}");
            }
        }

        public static void CompileCondition(Dictionary<string, double> datas)
        {
            try
            {
                var lstParam = new List<Parameter>();

                foreach (var data in datas)
                {
                    lstParam.Add(new Parameter(data.Key, data.Value));// 将传感器数据填入表达式的参数 
                }

                // 评估规则  
                var interpreter = new Interpreter();

                foreach (var rule in rules)
                {
                    var condition = rule.Condition.Replace(" AND ", " && ").Replace(" OR ", " || ");

                    bool result = (bool)interpreter.Eval(condition, lstParam.ToArray());
                    if (result)
                    {
                        Console.WriteLine(rule.Description);

                        switch (rule.Action)
                        {
                            case "HT":
                                break;
                            case "LH":
                                break;
                            case "THN":
                                break;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"[Error] RuleMgr,CompileCondition,errmsg:{ex.Message}");
            }
        }
    }
}

Program.cs

namespace ConfigRules
{
    internal class Program
    { 
        static void Main(string[] args)
        {
            // 模拟传感器数据  
            var sensorData = new Dictionary<string, double>
            {
                { "temperature", 50 },
                { "humidity", 10 }
            };

            // 读取 JSON 文件中的规则  
            RuleMgr.LoadConfig("rules.json");

            RuleMgr.CompileCondition(sensorData);

            Console.ReadLine();
        }
    }
}