重构项目，将项目拆分（临时提交）
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345
DMS.WPF/Services/MqttBackgroundService.cs
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345
DMS.WPF/Services/MqttBackgroundService.cs
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using System.Collections.Concurrent;
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using System.Text;
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using System.Threading.Channels;
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using DMS.Data.Repositories;
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using DMS.Helper;
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using DMS.Models;
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using Microsoft.Extensions.Hosting;
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using MQTTnet;
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using MQTTnet.Client;
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using MQTTnet.Client.Connecting;
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using MQTTnet.Client.Disconnecting;
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using MQTTnet.Client.Options;
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namespace DMS.Services
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{
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/// <summary>
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/// MQTT后台服务，继承自BackgroundService，用于在后台管理MQTT连接和数据发布。
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/// </summary>
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public class MqttBackgroundService : BackgroundService
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{
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private readonly DataServices _dataServices;
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private readonly MqttRepository _mqttRepository;
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private readonly ConcurrentDictionary<int, IMqttClient> _mqttClients;
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private readonly ConcurrentDictionary<int, Mqtt> _mqttConfigDic;
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private readonly ConcurrentDictionary<int, int> _reconnectAttempts;
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private readonly SemaphoreSlim _reloadSemaphore = new(0);
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private readonly Channel<VariableMqtt> _messageChannel;
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/// <summary>
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/// 构造函数，注入DataServices。
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/// </summary>
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public MqttBackgroundService(DataServices dataServices, MqttRepository mqttRepository)
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{
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_dataServices = dataServices;
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_mqttRepository = mqttRepository;
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_mqttClients = new ConcurrentDictionary<int, IMqttClient>();
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_mqttConfigDic = new ConcurrentDictionary<int, Mqtt>();
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_reconnectAttempts = new ConcurrentDictionary<int, int>();
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_messageChannel = Channel.CreateUnbounded<VariableMqtt>();
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_dataServices.OnMqttListChanged += HandleMqttListChanged;
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}
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/// <summary>
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/// 将待发送的变量数据异步推入队列。
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/// </summary>
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/// <param name="data">包含MQTT别名和变量数据的对象。</param>
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public async Task SendVariableAsync(VariableMqtt data)
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{
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await _messageChannel.Writer.WriteAsync(data);
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}
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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NlogHelper.Info("Mqtt后台服务正在启动。");
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_reloadSemaphore.Release();
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var processQueueTask = ProcessMessageQueueAsync(stoppingToken);
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try
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{
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while (!stoppingToken.IsCancellationRequested)
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{
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await _reloadSemaphore.WaitAsync(stoppingToken);
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if (stoppingToken.IsCancellationRequested) break;
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if (_dataServices.Mqtts == null || _dataServices.Mqtts.Count == 0)
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{
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NlogHelper.Info("没有可用的Mqtt配置，等待Mqtt列表更新...");
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continue;
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}
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if (!LoadMqttConfigurations())
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{
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NlogHelper.Info("加载Mqtt配置过程中发生了错误，停止后面的操作。");
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continue;
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}
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await ConnectMqttList(stoppingToken);
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NlogHelper.Info("Mqtt后台服务已启动。");
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while (!stoppingToken.IsCancellationRequested && _reloadSemaphore.CurrentCount == 0)
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{
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await Task.Delay(1000, stoppingToken);
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}
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}
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}
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catch (OperationCanceledException)
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{
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NlogHelper.Info("Mqtt后台服务正在停止。");
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}
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catch (Exception e)
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{
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NlogHelper.Error($"Mqtt后台服务运行中发生了错误:{e.Message}", e);
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}
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finally
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{
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_messageChannel.Writer.Complete();
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await processQueueTask; // 等待消息队列处理完成
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await DisconnectAll(stoppingToken);
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_dataServices.OnMqttListChanged -= HandleMqttListChanged;
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NlogHelper.Info("Mqtt后台服务已停止。");
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}
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}
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private async Task ProcessMessageQueueAsync(CancellationToken stoppingToken)
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{
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NlogHelper.Info("MQTT消息发送队列处理器已启动。");
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var batch = new List<VariableMqtt>();
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var timer = new PeriodicTimer(TimeSpan.FromSeconds(1));
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while (!stoppingToken.IsCancellationRequested)
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{
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try
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{
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// 等待信号：要么是新消息到达，要么是1秒定时器触发
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await Task.WhenAny(
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_messageChannel.Reader.WaitToReadAsync(stoppingToken).AsTask(),
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timer.WaitForNextTickAsync(stoppingToken).AsTask()
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);
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// 尽可能多地读取消息，直到达到批次上限
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while (batch.Count < 50 && _messageChannel.Reader.TryRead(out var message))
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{
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batch.Add(message);
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}
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if (batch.Any())
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{
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await SendBatchAsync(batch, stoppingToken);
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batch.Clear();
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}
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}
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catch (OperationCanceledException)
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{
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NlogHelper.Info("MQTT消息发送队列处理器已停止。");
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break;
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}
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catch (Exception ex)
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{
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NlogHelper.Error($"处理MQTT消息队列时发生错误: {ex.Message}", ex);
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await Task.Delay(5000, stoppingToken); // 发生未知错误时，延迟一段时间再重试
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}
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}
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}
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private async Task SendBatchAsync(List<VariableMqtt> batch, CancellationToken stoppingToken)
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{
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NlogHelper.Info($"准备发送一批 {batch.Count} 条MQTT消息。");
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// 按MQTT服务器ID进行分组
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var groupedByMqtt = batch.GroupBy(vm => vm.MqttId);
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foreach (var group in groupedByMqtt)
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{
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var mqttId = group.Key;
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if (!_mqttClients.TryGetValue(mqttId, out var client) || !client.IsConnected)
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{
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NlogHelper.Warn($"MQTT客户端 (ID: {mqttId}) 未连接或不存在，跳过 {group.Count()} 条消息。");
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continue;
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}
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var messages = group.Select(vm => new MqttApplicationMessageBuilder()
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.WithTopic(vm.Mqtt.PublishTopic)
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.WithPayload(vm.Variable?.DataValue ?? string.Empty)
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.WithQualityOfServiceLevel(MQTTnet.Protocol.MqttQualityOfServiceLevel.AtMostOnce)
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.Build())
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.ToList();
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try
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{
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foreach (var message in messages)
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{
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await client.PublishAsync(message, stoppingToken);
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}
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NlogHelper.Info($"成功向MQTT客户端 (ID: {mqttId}) 发送 {messages.Count} 条消息。");
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}
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catch (Exception ex)
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{
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NlogHelper.Error($"向MQTT客户端 (ID: {mqttId}) 批量发送消息时发生错误: {ex.Message}", ex);
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}
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}
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}
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private async Task DisconnectAll(CancellationToken stoppingToken)
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{
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var disconnectTasks = _mqttClients.Values.Select(client => client.DisconnectAsync(new MqttClientDisconnectOptions(), stoppingToken));
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await Task.WhenAll(disconnectTasks);
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_mqttClients.Clear();
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}
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private bool LoadMqttConfigurations()
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{
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try
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{
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NlogHelper.Info("开始加载Mqtt配置文件...");
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_mqttConfigDic.Clear();
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var mqttConfigList = _dataServices.Mqtts.Where(m => m.IsActive).ToList();
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foreach (var mqtt in mqttConfigList)
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{
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mqtt.OnMqttIsActiveChanged += OnMqttIsActiveChangedHandler;
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_mqttConfigDic.TryAdd(mqtt.Id, mqtt);
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mqtt.ConnectMessage = "配置加载成功.";
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}
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NlogHelper.Info($"Mqtt配置文件加载成功，开启的Mqtt客户端：{mqttConfigList.Count}个。");
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return true;
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}
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catch (Exception e)
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{
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NotificationHelper.ShowError($"Mqtt后台服务在加载配置的过程中发生了错误:{e.Message}", e);
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return false;
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}
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}
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private async void OnMqttIsActiveChangedHandler(Mqtt mqtt)
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{
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try
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{
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if (mqtt.IsActive)
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{
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await ConnectMqtt(mqtt, CancellationToken.None);
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}
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else
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{
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if (_mqttClients.TryRemove(mqtt.Id, out var client) && client.IsConnected)
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{
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await client.DisconnectAsync();
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NlogHelper.Info($"{mqtt.Name}的客户端，与服务器断开连接.");
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}
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mqtt.IsConnected = false;
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mqtt.ConnectMessage = "已断开连接.";
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}
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await _mqttRepository.UpdateAsync(mqtt);
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NotificationHelper.ShowSuccess($"Mqtt客户端：{mqtt.Name},激活状态修改成功。");
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}
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catch (Exception e)
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{
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NotificationHelper.ShowError($"{mqtt.Name}客户端，开启或关闭的过程中发生了错误:{e.Message}", e);
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}
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}
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private async Task ConnectMqttList(CancellationToken stoppingToken)
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{
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var connectTasks = _mqttConfigDic.Values.Select(mqtt => ConnectMqtt(mqtt, stoppingToken));
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await Task.WhenAll(connectTasks);
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}
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private async Task ConnectMqtt(Mqtt mqtt, CancellationToken stoppingToken)
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{
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if (_mqttClients.TryGetValue(mqtt.Id, out var existingClient) && existingClient.IsConnected)
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{
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NlogHelper.Info($"{mqtt.Name}的Mqtt服务器连接已存在。");
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return;
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}
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NlogHelper.Info($"开始连接：{mqtt.Name}的服务器...");
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mqtt.ConnectMessage = "开始连接服务器...";
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var factory = new MqttFactory();
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var client = factory.CreateMqttClient();
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var options = new MqttClientOptionsBuilder()
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.WithClientId(mqtt.ClientID)
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.WithTcpServer(mqtt.Host, mqtt.Port)
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.WithCredentials(mqtt.UserName, mqtt.PassWord)
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.WithCleanSession()
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.Build();
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client.UseConnectedHandler(async e => await HandleConnected(e, client, mqtt));
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client.UseApplicationMessageReceivedHandler(e => HandleMessageReceived(e, mqtt));
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client.UseDisconnectedHandler(async e => await HandleDisconnected(e, options, client, mqtt, stoppingToken));
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try
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{
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await client.ConnectAsync(options, stoppingToken);
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_mqttClients.AddOrUpdate(mqtt.Id, client, (id, oldClient) => client);
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}
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catch (Exception ex)
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{
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mqtt.ConnectMessage = $"连接MQTT服务器失败: {ex.Message}";
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NlogHelper.Error($"连接MQTT服务器失败: {mqtt.Name}", ex);
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}
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}
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private static void HandleMessageReceived(MqttApplicationMessageReceivedEventArgs e, Mqtt mqtt)
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{
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var topic = e.ApplicationMessage.Topic;
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var payload = Encoding.UTF8.GetString(e.ApplicationMessage.Payload);
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NlogHelper.Info($"MQTT客户端 {mqtt.Name} 收到消息: 主题={topic}, 消息={payload}");
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}
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private async Task HandleDisconnected(MqttClientDisconnectedEventArgs args, IMqttClientOptions options, IMqttClient client, Mqtt mqtt, CancellationToken stoppingToken)
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{
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NotificationHelper.ShowWarn($"与MQTT服务器断开连接: {mqtt.Name}");
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mqtt.ConnectMessage = "断开连接.";
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mqtt.IsConnected = false;
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if (stoppingToken.IsCancellationRequested || !mqtt.IsActive) return;
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_reconnectAttempts.AddOrUpdate(mqtt.Id, 1, (id, count) => count + 1);
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var attempt = _reconnectAttempts[mqtt.Id];
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var delay = TimeSpan.FromSeconds(Math.Min(60, Math.Pow(2, attempt)));
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NlogHelper.Info($"与MQTT服务器：{mqtt.Name} 的连接已断开。将在 {delay.TotalSeconds} 秒后尝试第 {attempt} 次重新连接...");
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mqtt.ConnectMessage = $"连接已断开，{delay.TotalSeconds}秒后尝试重连...";
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await Task.Delay(delay, stoppingToken);
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try
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{
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mqtt.ConnectMessage = "开始重新连接服务器...";
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await client.ConnectAsync(options, stoppingToken);
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}
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catch (Exception ex)
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{
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mqtt.ConnectMessage = "重新连接失败.";
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NlogHelper.Error($"重新与Mqtt服务器连接失败: {mqtt.Name}", ex);
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}
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}
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private async Task HandleConnected(MqttClientConnectedEventArgs args, IMqttClient client, Mqtt mqtt)
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{
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_reconnectAttempts.TryRemove(mqtt.Id, out _);
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NotificationHelper.ShowSuccess($"已连接到MQTT服务器: {mqtt.Name}");
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mqtt.IsConnected = true;
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mqtt.ConnectMessage = "连接成功.";
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if (!string.IsNullOrEmpty(mqtt.SubTopic))
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{
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await client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(mqtt.SubTopic).Build());
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NlogHelper.Info($"MQTT客户端 {mqtt.Name} 已订阅主题: {mqtt.SubTopic}");
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}
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}
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private void HandleMqttListChanged(List<Mqtt> mqtts)
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{
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NlogHelper.Info("Mqtt列表发生了变化，正在重新加载数据...");
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_reloadSemaphore.Release();
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}
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}
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}
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