236 lines
9.2 KiB
C#
236 lines
9.2 KiB
C#
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using Microsoft.Extensions.Options;
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using System.Collections.Concurrent;
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namespace RIZO.Admin.WebApi.PLC
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{
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public class PlcHostedService : IHostedService, IDisposable
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{
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private readonly ILogger<PlcHostedService> _logger;
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private readonly PlcService _plcService;
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private readonly List<PlcConfig> _plcConfigs;
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private Timer _timer;
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private bool _isRunning;
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private readonly SemaphoreSlim _semaphore;
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private readonly object _timerLock = new();
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// 连接状态缓存：减少短时间内重复连接测试
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private readonly ConcurrentDictionary<string, PlcConnectionState> _connectionStateCache;
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// 可配置参数（建议放到配置文件中）
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private readonly int _parallelDegree = 10; // 并行度（20+PLC建议8-12）
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private readonly int _pollingIntervalSeconds = 5; // 轮询间隔
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private readonly int _connectTimeoutSeconds = 3; // 单个PLC连接超时时间
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private readonly int _stateCacheExpireSeconds = 10; // 连接状态缓存有效期
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/// <summary>
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/// PLC 连接状态缓存对象
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/// </summary>
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private class PlcConnectionState
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{
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public bool IsConnected { get; set; }
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public DateTime LastCheckTime { get; set; }
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}
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public PlcHostedService(
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ILogger<PlcHostedService> logger,
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PlcService plcService,
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IOptions<List<PlcConfig>> plcConfigs)
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{
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_logger = logger;
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_plcService = plcService;
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_plcConfigs = plcConfigs.Value ?? new List<PlcConfig>();
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// 初始化并行控制信号量
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_semaphore = new SemaphoreSlim(_parallelDegree, _parallelDegree);
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// 初始化连接状态缓存
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_connectionStateCache = new ConcurrentDictionary<string, PlcConnectionState>();
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foreach (var config in _plcConfigs)
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{
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_connectionStateCache.TryAdd(config.Ip, new PlcConnectionState
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{
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IsConnected = false,
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LastCheckTime = DateTime.MinValue
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});
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}
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}
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public async Task StartAsync(CancellationToken cancellationToken)
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{
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_logger.LogInformation("PLC后台监听服务启动中...");
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if (!_plcConfigs.Any())
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{
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_logger.LogWarning("未配置PLC参数，跳过PLC自动连接");
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return;
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}
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_isRunning = true;
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// 1. 启动时并行测试所有PLC连接
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await BatchConnectPlcAsync(cancellationToken);
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// 2. 启动安全定时器（防重叠执行）
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_timer = new Timer(
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TimerCallback,
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null,
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TimeSpan.Zero,
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TimeSpan.FromSeconds(_pollingIntervalSeconds));
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_logger.LogInformation($"PLC服务启动完成 | 并行度：{_parallelDegree} | 轮询间隔：{_pollingIntervalSeconds}s | 设备总数：{_plcConfigs.Count}");
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}
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/// <summary>
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/// 定时器安全回调（防重叠执行）
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/// </summary>
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private async void TimerCallback(object state)
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{
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if (!_isRunning || !Monitor.TryEnter(_timerLock))
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{
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_logger.LogDebug("前一轮PLC轮询未完成，跳过本次执行");
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return;
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}
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try
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{
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await PollPlcDataAsync();
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "PLC轮询回调异常");
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}
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finally
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{
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Monitor.Exit(_timerLock);
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}
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}
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/// <summary>
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/// 启动时批量并行连接PLC
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/// </summary>
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private async Task BatchConnectPlcAsync(CancellationToken cancellationToken)
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{
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_logger.LogInformation("开始批量连接所有PLC...");
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var tasks = _plcConfigs.Select(async config =>
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{
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await _semaphore.WaitAsync(cancellationToken);
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try
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{
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// 带超时的连接测试
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using var timeoutToken = new CancellationTokenSource(TimeSpan.FromSeconds(_connectTimeoutSeconds));
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var result = await _plcService.TestSinglePlcAsync(config, timeoutToken.Token);
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// 更新缓存状态
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var state = _connectionStateCache[config.Ip];
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state.IsConnected = result.ConnectSuccess;
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state.LastCheckTime = DateTime.Now;
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if (result.ConnectSuccess)
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_logger.LogInformation($"[{config.PlcName}] 连接成功 | IP：{config.Ip}");
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else
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_logger.LogWarning($"[{config.PlcName}] 连接失败 | IP：{config.Ip} | 原因：{result.ConnectMessage}");
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}
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catch (OperationCanceledException)
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{
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_logger.LogWarning($"[{config.PlcName}] 连接超时 | IP：{config.Ip} | 超时时间：{_connectTimeoutSeconds}s");
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, $"[{config.PlcName}] 连接异常 | IP：{config.Ip}");
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}
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finally
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{
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_semaphore.Release();
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}
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});
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await Task.WhenAll(tasks);
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}
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/// <summary>
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/// 并行轮询PLC数据（读取前先验证连接状态）
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/// </summary>
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private async Task PollPlcDataAsync()
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{
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_logger.LogInformation("开始轮询PLC数据...");
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var tasks = _plcConfigs.Select(async config =>
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{
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await _semaphore.WaitAsync();
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try
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{
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// 1. 先从缓存获取连接状态，未过期则直接使用
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var state = _connectionStateCache[config.Ip];
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var needRecheck = (DateTime.Now - state.LastCheckTime).TotalSeconds > _stateCacheExpireSeconds;
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bool isConnected = state.IsConnected;
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if (needRecheck)
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{
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// 缓存过期，重新测试连接（带超时）
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using var timeoutToken = new CancellationTokenSource(TimeSpan.FromSeconds(_connectTimeoutSeconds));
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var connectResult = await _plcService.TestSinglePlcAsync(config, timeoutToken.Token);
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isConnected = connectResult.ConnectSuccess;
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// 更新缓存
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state.IsConnected = isConnected;
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state.LastCheckTime = DateTime.Now;
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}
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// 2. 连接失败直接跳过
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if (!isConnected)
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{
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_logger.LogDebug($"[{config.PlcName}] 连接断开，跳过数据读取 | IP：{config.Ip}");
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return;
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}
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// 3. 连接正常，读取数据
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var (success, value, message) = await _plcService.ReadPlcDataAsync(
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config.Ip, config.Rack, config.Slot, config.TestReadAddress);
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if (success)
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{
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_logger.LogInformation($"[{config.PlcName}] 数据读取成功 | 地址：{config.TestReadAddress} | 值：{value}");
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// 数据处理逻辑：入库/推前端/存Redis
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// await ProcessPlcDataAsync(config, value);
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}
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else
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{
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_logger.LogWarning($"[{config.PlcName}] 数据读取失败 | 原因：{message}");
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// 读取失败，标记连接状态为断开
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state.IsConnected = false;
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}
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}
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catch (OperationCanceledException)
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{
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_logger.LogWarning($"[{config.PlcName}] 操作超时 | IP：{config.Ip}");
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_connectionStateCache[config.Ip].IsConnected = false;
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, $"[{config.PlcName}] 轮询异常 | IP：{config.Ip}");
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_connectionStateCache[config.Ip].IsConnected = false;
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}
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finally
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{
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_semaphore.Release();
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}
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});
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await Task.WhenAll(tasks);
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_logger.LogInformation($"PLC数据轮询完成 | 本次轮询设备数：{_plcConfigs.Count}");
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}
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public Task StopAsync(CancellationToken cancellationToken)
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{
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_logger.LogInformation("PLC后台监听服务停止中...");
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_isRunning = false;
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_timer?.Change(Timeout.Infinite, 0);
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return Task.CompletedTask;
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}
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public void Dispose()
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{
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_timer?.Dispose();
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_semaphore?.Dispose();
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_logger.LogInformation("PLC后台监听服务已释放资源");
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}
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}
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}
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