消除所有错误，重新构建
This commit is contained in:
585
DMS.Infrastructure/Services/OpcUaBackgroundService.cs
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585
DMS.Infrastructure/Services/OpcUaBackgroundService.cs
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using System.Collections.Concurrent;
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using DMS.Core.Enums;
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using DMS.Core.Models;
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using Microsoft.Extensions.Hosting;
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using Opc.Ua;
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using Opc.Ua.Client;
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using Microsoft.Extensions.Logging;
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using DMS.Application.Interfaces;
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using DMS.Core.Interfaces;
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namespace DMS.Infrastructure.Services;
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public class OpcUaBackgroundService : BackgroundService
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{
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private readonly IDeviceDataService _deviceDataService;
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private readonly IDataProcessingService _dataProcessingService;
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private readonly ILogger<OpcUaBackgroundService> _logger;
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// 存储 OPC UA 设备，键为设备Id，值为会话对象。
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private readonly ConcurrentDictionary<int, Device> _opcUaDevices;
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// 存储 OPC UA 会话，键为终结点 URL，值为会话对象。
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private readonly ConcurrentDictionary<string, Session> _opcUaSessions;
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// 存储 OPC UA 订阅，键为终结点 URL，值为订阅对象。
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private readonly ConcurrentDictionary<string, Subscription> _opcUaSubscriptions;
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// 存储活动的 OPC UA 变量，键为变量的OpcNodeId
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private readonly ConcurrentDictionary<string, Variable> _opcUaPollVariablesByNodeId;
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// 储存所有要轮询更新的变量，键是Device.Id,值是这个设备所有要轮询的变量
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private readonly ConcurrentDictionary<int, List<Variable>> _opcUaPollVariablesByDeviceId;
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// 储存所有要订阅更新的变量，键是Device.Id,值是这个设备所有要轮询的变量
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private readonly ConcurrentDictionary<int, List<Variable>> _opcUaSubVariablesByDeviceId;
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private readonly SemaphoreSlim _reloadSemaphore = new SemaphoreSlim(0);
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// OPC UA 轮询间隔（毫秒）
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private readonly int _opcUaPollIntervalMs = 100;
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// OPC UA 订阅发布间隔（毫秒）
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private readonly int _opcUaSubscriptionPublishingIntervalMs = 1000;
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// OPC UA 订阅采样间隔（毫秒）
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private readonly int _opcUaSubscriptionSamplingIntervalMs = 1000;
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// 模拟 PollingIntervals，实际应用中可能从配置或数据库加载
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private static readonly Dictionary<PollLevelType, TimeSpan> PollingIntervals = new Dictionary<PollLevelType, TimeSpan>
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{
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{ PollLevelType.TenMilliseconds, TimeSpan.FromMilliseconds((int)PollLevelType.TenMilliseconds) },
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{ PollLevelType.HundredMilliseconds, TimeSpan.FromMilliseconds((int)PollLevelType.HundredMilliseconds) },
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{ PollLevelType.FiveHundredMilliseconds, TimeSpan.FromMilliseconds((int)PollLevelType.FiveHundredMilliseconds) },
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{ PollLevelType.OneSecond, TimeSpan.FromMilliseconds((int)PollLevelType.OneSecond) },
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{ PollLevelType.FiveSeconds, TimeSpan.FromMilliseconds((int)PollLevelType.FiveSeconds) },
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{ PollLevelType.TenSeconds, TimeSpan.FromMilliseconds((int)PollLevelType.TenSeconds) },
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{ PollLevelType.TwentySeconds, TimeSpan.FromMilliseconds((int)PollLevelType.TwentySeconds) },
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{ PollLevelType.ThirtySeconds, TimeSpan.FromMilliseconds((int)PollLevelType.ThirtySeconds) },
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{ PollLevelType.OneMinute, TimeSpan.FromMilliseconds((int)PollLevelType.OneMinute) },
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{ PollLevelType.ThreeMinutes, TimeSpan.FromMilliseconds((int)PollLevelType.ThreeMinutes) },
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{ PollLevelType.FiveMinutes, TimeSpan.FromMilliseconds((int)PollLevelType.FiveMinutes) },
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{ PollLevelType.TenMinutes, TimeSpan.FromMilliseconds((int)PollLevelType.TenMinutes) },
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{ PollLevelType.ThirtyMinutes, TimeSpan.FromMilliseconds((int)PollLevelType.ThirtyMinutes) }
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};
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public OpcUaBackgroundService(IDeviceDataService deviceDataService, IDataProcessingService dataProcessingService, ILogger<OpcUaBackgroundService> logger)
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{
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_deviceDataService = deviceDataService;
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_dataProcessingService = dataProcessingService;
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_logger = logger;
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_opcUaDevices = new ConcurrentDictionary<int, Device>();
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_opcUaSessions = new ConcurrentDictionary<string, Session>();
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_opcUaSubscriptions = new ConcurrentDictionary<string, Subscription>();
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_opcUaPollVariablesByNodeId = new ConcurrentDictionary<string, Variable>();
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_opcUaPollVariablesByDeviceId = new ConcurrentDictionary<int, List<Variable>>();
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_opcUaSubVariablesByDeviceId = new ConcurrentDictionary<int, List<Variable>>();
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_deviceDataService.OnDeviceListChanged += HandleDeviceListChanged;
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_deviceDataService.OnDeviceIsActiveChanged += HandleDeviceIsActiveChanged;
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}
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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_logger.LogInformation("OPC UA 后台服务正在启动。");
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_reloadSemaphore.Release(); // Initial trigger to load variables and connect
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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); // Wait for a reload signal
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if (stoppingToken.IsCancellationRequested)
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{
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break;
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}
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if (_deviceDataService.Devices == null || _deviceDataService.Devices.Count == 0)
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{
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_logger.LogInformation("没有可用的OPC UA设备，等待设备列表更新...");
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continue;
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}
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var isLoaded = LoadVariables();
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if (!isLoaded)
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{
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_logger.LogInformation("加载变量过程中发生了错误，停止后面的操作。");
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continue;
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}
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await ConnectOpcUaServiceAsync(stoppingToken);
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await SetupOpcUaSubscriptionAsync(stoppingToken);
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_logger.LogInformation("OPC UA 后台服务已启动。");
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// 持续轮询，直到取消请求或需要重新加载
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while (!stoppingToken.IsCancellationRequested && _reloadSemaphore.CurrentCount == 0)
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{
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await PollOpcUaVariableOnceAsync(stoppingToken);
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await Task.Delay(_opcUaPollIntervalMs, 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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_logger.LogInformation("OPC UA 后台服务已停止。");
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}
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catch (Exception e)
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{
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_logger.LogError(e, $"OPC UA 后台服务运行中发生了错误:{e.Message}");
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}
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finally
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{
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await DisconnectAllOpcUaSessionsAsync();
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_deviceDataService.OnDeviceListChanged -= HandleDeviceListChanged;
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_deviceDataService.OnDeviceIsActiveChanged -= HandleDeviceIsActiveChanged;
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}
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}
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private void HandleDeviceListChanged(List<Device> devices)
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{
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_logger.LogInformation("设备列表已更改。OPC UA 客户端可能需要重新初始化。");
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_reloadSemaphore.Release(); // 触发ExecuteAsync中的全面重新加载
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}
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private async void HandleDeviceIsActiveChanged(Device device, bool isActive)
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{
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if (device.Protocol != ProtocolType.OpcUA)
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return;
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_logger.LogInformation($"设备 {device.Name} (ID: {device.Id}) 的IsActive状态改变为 {isActive}。");
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if (!isActive)
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{
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// 设备变为非活动状态，断开连接
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if (_opcUaSessions.TryRemove(device.OpcUaServerUrl, out var session))
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{
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try
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{
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if (_opcUaSubscriptions.TryRemove(device.OpcUaServerUrl, out var subscription))
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{
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// 删除订阅。
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await subscription.DeleteAsync(true);
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_logger.LogInformation($"已删除设备 {device.Name} ({device.OpcUaServerUrl}) 的订阅。");
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}
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if (session.Connected)
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{
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await session.CloseAsync();
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_logger.LogInformation($"已断开设备 {device.Name} ({device.OpcUaServerUrl}) 的连接。");
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}
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, $"断开设备 {device.Name} ({device.OpcUaServerUrl}) 连接时发生错误：{ex.Message}");
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}
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}
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}
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// 触发重新加载，让LoadVariables和ConnectOpcUaServiceAsync处理设备列表的更新
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_reloadSemaphore.Release();
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}
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/// <summary>
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/// 从数据库加载所有活动的 OPC UA 变量，并进行相应的连接和订阅管理。
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/// </summary>
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private bool LoadVariables()
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{
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try
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{
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_opcUaDevices.Clear();
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_opcUaPollVariablesByDeviceId.Clear();
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_opcUaSubVariablesByDeviceId.Clear();
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_opcUaPollVariablesByNodeId.Clear();
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_logger.LogInformation("开始加载OPC UA变量....");
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var opcUaDevices = _deviceDataService
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.Devices.Where(d => d.Protocol == ProtocolType.OpcUA && d.IsActive == true)
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.ToList();
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if (opcUaDevices.Count == 0)
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{
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_logger.LogInformation("没有找到活动的OPC UA设备。");
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return true; // No active devices, but not an error
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}
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int totalPollVariableCount = 0;
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int totalSubVariableCount = 0;
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foreach (var opcUaDevice in opcUaDevices)
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{
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_opcUaDevices.AddOrUpdate(opcUaDevice.Id, opcUaDevice, (key, oldValue) => opcUaDevice);
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//查找设备中所有要轮询的变量
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var dPollList = opcUaDevice.VariableTables?.SelectMany(vt => vt.Variables)
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.Where(vd => vd.IsActive == true &&
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vd.Protocol == ProtocolType.OpcUA &&
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vd.OpcUaUpdateType == OpcUaUpdateType.OpcUaPoll)
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.ToList();
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// 将变量保存到字典中，方便Read后还原
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foreach (var variable in dPollList)
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{
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_opcUaPollVariablesByNodeId.AddOrUpdate(variable.OpcUaNodeId, variable,
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(key, oldValue) => variable);
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}
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totalPollVariableCount += dPollList.Count;
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_opcUaPollVariablesByDeviceId.AddOrUpdate(opcUaDevice.Id, dPollList, (key, oldValue) => dPollList);
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//查找设备中所有要订阅的变量
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var dSubList = opcUaDevice.VariableTables?.SelectMany(vt => vt.Variables)
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.Where(vd => vd.IsActive == true &&
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vd.Protocol == ProtocolType.OpcUA &&
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vd.OpcUaUpdateType == OpcUaUpdateType.OpcUaSubscription)
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.ToList();
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totalSubVariableCount += dSubList.Count;
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_opcUaSubVariablesByDeviceId.AddOrUpdate(opcUaDevice.Id, dSubList, (key, oldValue) => dSubList);
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}
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_logger.LogInformation(
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$"OPC UA 变量加载成功，共加载OPC UA设备：{opcUaDevices.Count}个，轮询变量数：{totalPollVariableCount}，订阅变量数：{totalSubVariableCount}");
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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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_logger.LogError(e, $"加载OPC UA变量的过程中发生了错误：{e.Message}");
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return false;
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}
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}
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/// <summary>
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/// 连接到 OPC UA 服务器并订阅或轮询指定的变量。
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/// </summary>
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private async Task ConnectOpcUaServiceAsync(CancellationToken stoppingToken)
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{
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if (stoppingToken.IsCancellationRequested)
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{
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return;
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}
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var connectTasks = new List<Task>();
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// 遍历_opcUaDevices中的所有设备，尝试连接
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foreach (var device in _opcUaDevices.Values.ToList())
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{
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connectTasks.Add(ConnectSingleOpcUaDeviceAsync(device, stoppingToken));
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}
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await Task.WhenAll(connectTasks);
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}
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/// <summary>
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/// 连接单个OPC UA设备。
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/// </summary>
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/// <param name="device">要连接的设备。</param>
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/// <param name="stoppingToken">取消令牌。</param>
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private async Task ConnectSingleOpcUaDeviceAsync(Device device, CancellationToken stoppingToken = default)
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{
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if (stoppingToken.IsCancellationRequested)
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{
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return;
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}
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// Check if already connected
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if (_opcUaSessions.TryGetValue(device.OpcUaServerUrl, out var existingSession))
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{
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if (existingSession.Connected)
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{
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_logger.LogInformation($"已连接到 OPC UA 服务器: {device.OpcUaServerUrl}");
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return;
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}
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else
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{
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// Remove disconnected session from dictionary to attempt reconnection
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_opcUaSessions.TryRemove(device.OpcUaServerUrl, out _);
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}
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}
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_logger.LogInformation($"开始连接OPC UA服务器: {device.Name} ({device.OpcUaServerUrl})");
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try
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{
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var session = await OpcUaHelper.CreateOpcUaSessionAsync(device.OpcUaServerUrl, stoppingToken);
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if (session == null)
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{
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_logger.LogWarning($"创建OPC UA会话失败: {device.OpcUaServerUrl}");
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return; // 连接失败，直接返回
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}
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_opcUaSessions.AddOrUpdate(device.OpcUaServerUrl, session, (key, oldValue) => session);
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_logger.LogInformation($"已连接到OPC UA服务器: {device.Name} ({device.OpcUaServerUrl})");
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}
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catch (Exception e)
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{
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_logger.LogError(e, $"OPC UA服务连接 {device.Name} ({device.OpcUaServerUrl}) 过程中发生错误：{e.Message}");
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}
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}
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private async Task PollOpcUaVariableOnceAsync(CancellationToken stoppingToken)
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{
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try
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{
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var deviceIdsToPoll = _opcUaPollVariablesByDeviceId.Keys.ToList();
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var pollingTasks = deviceIdsToPoll.Select(deviceId => PollSingleDeviceVariablesAsync(deviceId, stoppingToken)).ToList();
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await Task.WhenAll(pollingTasks);
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}
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catch (OperationCanceledException)
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{
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_logger.LogInformation("OPC UA 后台服务轮询变量被取消。");
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, $"OPC UA 后台服务在轮询变量过程中发生错误：{ex.Message}");
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}
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}
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/// <summary>
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/// 轮询单个设备的所有 OPC UA 变量。
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/// </summary>
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/// <param name="deviceId">设备的 ID。</param>
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/// <param name="stoppingToken">取消令牌。</param>
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private async Task PollSingleDeviceVariablesAsync(int deviceId, CancellationToken stoppingToken)
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{
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if (stoppingToken.IsCancellationRequested) return;
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if (!_opcUaDevices.TryGetValue(deviceId, out var device) || device.OpcUaServerUrl == null)
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{
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_logger.LogWarning($"OpcUa轮询变量时，在deviceDic中未找到ID为 {deviceId} 的设备，或其服务器地址为空，请检查！");
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return;
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}
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if (!device.IsActive) return;
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if (!_opcUaSessions.TryGetValue(device.OpcUaServerUrl, out var session) || !session.Connected)
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{
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if (device.IsActive)
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{
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_logger.LogWarning($"用于 {device.OpcUaServerUrl} 的 OPC UA 会话未连接。正在尝试重新连接...");
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await ConnectSingleOpcUaDeviceAsync(device, stoppingToken);
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}
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return;
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}
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if (!_opcUaPollVariablesByDeviceId.TryGetValue(deviceId, out var variableList) || variableList.Count == 0)
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{
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return;
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}
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foreach (var variable in variableList)
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{
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if (stoppingToken.IsCancellationRequested) return;
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if (!PollingIntervals.TryGetValue(variable.PollLevelType, out var interval) || (DateTime.Now - variable.UpdateTime) < interval)
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{
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continue;
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}
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await ReadAndProcessOpcUaVariableAsync(session, variable, stoppingToken);
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}
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}
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/// <summary>
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/// 读取单个 OPC UA 变量并处理其数据。
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/// </summary>
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/// <param name="session">OPC UA 会话。</param>
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/// <param name="variable">要读取的变量。</param>
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/// <param name="stoppingToken">取消令牌。</param>
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private async Task ReadAndProcessOpcUaVariableAsync(Session session, Variable variable, CancellationToken stoppingToken)
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{
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var nodesToRead = new ReadValueIdCollection
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{
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new ReadValueId
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{
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NodeId = new NodeId(variable.OpcUaNodeId),
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AttributeId = Attributes.Value
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}
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};
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try
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{
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var readResponse = await session.ReadAsync(null, 0, TimestampsToReturn.Both, nodesToRead, stoppingToken);
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var result = readResponse.Results?.FirstOrDefault();
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if (result == null) return;
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if (!StatusCode.IsGood(result.StatusCode))
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{
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_logger.LogWarning($"读取 OPC UA 变量 {variable.Name} ({variable.OpcUaNodeId}) 失败: {result.StatusCode}");
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return;
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}
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await UpdateAndEnqueueVariable(variable, result.Value);
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}
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catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadSessionIdInvalid)
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{
|
||||
_logger.LogError(ex, $"OPC UA会话ID无效，变量: {variable.Name} ({variable.OpcUaNodeId})。正在尝试重新连接...");
|
||||
// Assuming device can be retrieved from variable or passed as parameter if needed for ConnectSingleOpcUaDeviceAsync
|
||||
// For now, I'll just log and let the outer loop handle reconnection if the session is truly invalid for the device.
|
||||
// If a full device object is needed here, it would need to be passed down from PollSingleDeviceVariablesAsync.
|
||||
// For simplicity, I'll remove the direct reconnection attempt here and rely on the outer loop.
|
||||
// await ConnectSingleOpcUaDeviceAsync(variable.VariableTable.Device, stoppingToken);
|
||||
}
|
||||
catch (Exception ex)
|
||||
{
|
||||
_logger.LogError(ex, $"轮询OPC UA变量 {variable.Name} ({variable.OpcUaNodeId}) 时发生未知错误: {ex.Message}");
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// 更新变量数据，并将其推送到数据处理队列。
|
||||
/// </summary>
|
||||
/// <param name="variable">要更新的变量。</param>
|
||||
/// <param name="value">读取到的数据值。</param>
|
||||
private async Task UpdateAndEnqueueVariable(Variable variable, object value)
|
||||
{
|
||||
try
|
||||
{
|
||||
// 更新变量的原始数据值和显示值。
|
||||
variable.DataValue = value.ToString();
|
||||
variable.DisplayValue = value.ToString(); // 或者根据需要进行格式化
|
||||
variable.UpdateTime = DateTime.Now;
|
||||
// Console.WriteLine($"OpcUa后台服务轮询变量：{variable.Name},值：{variable.DataValue}");
|
||||
// 将更新后的数据推入处理队列。
|
||||
await _dataProcessingService.EnqueueAsync(variable);
|
||||
}
|
||||
catch (Exception ex)
|
||||
{
|
||||
_logger.LogError(ex, $"更新变量 {variable.Name} 并入队失败:{ex.Message}");
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// 设置 OPC UA 订阅并添加监控项。
|
||||
/// </summary>
|
||||
/// <param name="stoppingToken">取消令牌。</param>
|
||||
private async Task SetupOpcUaSubscriptionAsync(CancellationToken stoppingToken)
|
||||
{
|
||||
if (stoppingToken.IsCancellationRequested)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
var setupSubscriptionTasks = new List<Task>();
|
||||
|
||||
foreach (var deviceId in _opcUaSubVariablesByDeviceId.Keys.ToList())
|
||||
{
|
||||
setupSubscriptionTasks.Add(Task.Run(async () =>
|
||||
{
|
||||
if (stoppingToken.IsCancellationRequested)
|
||||
{
|
||||
return; // 任务被取消，退出循环
|
||||
}
|
||||
|
||||
var device = _deviceDataService.Devices.FirstOrDefault(d => d.Id == deviceId);
|
||||
if (device == null)
|
||||
{
|
||||
_logger.LogWarning($"未找到ID为 {deviceId} 的设备，无法设置订阅。");
|
||||
return;
|
||||
}
|
||||
|
||||
Subscription subscription = null;
|
||||
// 得到session
|
||||
if (!_opcUaSessions.TryGetValue(device.OpcUaServerUrl, out var session))
|
||||
{
|
||||
_logger.LogInformation($"从OpcUa会话字典中获取会话失败： {device.OpcUaServerUrl} ");
|
||||
return;
|
||||
}
|
||||
|
||||
// 判断设备是否已经添加了订阅
|
||||
if (_opcUaSubscriptions.TryGetValue(device.OpcUaServerUrl, out subscription))
|
||||
{
|
||||
_logger.LogInformation($"OPC UA 终结点 {device.OpcUaServerUrl} 已存在订阅。");
|
||||
}
|
||||
else
|
||||
{
|
||||
subscription = new Subscription(session.DefaultSubscription);
|
||||
subscription.PublishingInterval = _opcUaSubscriptionPublishingIntervalMs; // 发布间隔（毫秒）
|
||||
session.AddSubscription(subscription);
|
||||
subscription.Create();
|
||||
_opcUaSubscriptions.AddOrUpdate(device.OpcUaServerUrl, subscription,
|
||||
(key, oldValue) => subscription);
|
||||
}
|
||||
|
||||
// 将变量添加到订阅
|
||||
if (_opcUaSubVariablesByDeviceId.TryGetValue(deviceId, out var variablesToSubscribe))
|
||||
{
|
||||
foreach (Variable variable in variablesToSubscribe)
|
||||
{
|
||||
// 7. 创建监控项并添加到订阅中。
|
||||
MonitoredItem monitoredItem = new MonitoredItem(subscription.DefaultItem);
|
||||
monitoredItem.DisplayName = variable.Name;
|
||||
monitoredItem.StartNodeId = new NodeId(variable.OpcUaNodeId); // 设置要监控的节点 ID
|
||||
monitoredItem.AttributeId = Attributes.Value; // 监控节点的值属性
|
||||
monitoredItem.SamplingInterval = _opcUaSubscriptionSamplingIntervalMs; // 采样间隔（毫秒）
|
||||
monitoredItem.QueueSize = 1; // 队列大小
|
||||
monitoredItem.DiscardOldest = true; // 丢弃最旧的数据
|
||||
// 注册数据变化通知事件。
|
||||
monitoredItem.Notification += (sender, e) => OnSubNotification(variable, monitoredItem, e);
|
||||
|
||||
subscription.AddItem(monitoredItem);
|
||||
}
|
||||
|
||||
subscription.ApplyChanges(); // 应用更改
|
||||
_logger.LogInformation($"设备: {device.Name}, 添加了 {variablesToSubscribe.Count} 个订阅变量。");
|
||||
}
|
||||
}));
|
||||
}
|
||||
|
||||
await Task.WhenAll(setupSubscriptionTasks);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// 订阅变量变化的通知
|
||||
/// </summary>
|
||||
/// <param name="variable">发生变化的变量。</param>
|
||||
/// <param name="monitoredItem"></param>
|
||||
/// <param name="e"></param>
|
||||
private async void OnSubNotification(Variable variable, MonitoredItem monitoredItem,
|
||||
MonitoredItemNotificationEventArgs e)
|
||||
{
|
||||
|
||||
foreach (var value in monitoredItem.DequeueValues())
|
||||
{
|
||||
_logger.LogInformation(
|
||||
$"[OPC UA 通知] {monitoredItem.DisplayName}: {value.Value} | 时间戳: {value.SourceTimestamp.ToLocalTime()} | 状态: {value.StatusCode}");
|
||||
if (StatusCode.IsGood(value.StatusCode))
|
||||
{
|
||||
await UpdateAndEnqueueVariable(variable, value.Value);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// 断开所有 OPC UA 会话。
|
||||
/// </summary>
|
||||
private async Task DisconnectAllOpcUaSessionsAsync()
|
||||
{
|
||||
if (_opcUaSessions.IsEmpty)
|
||||
return;
|
||||
|
||||
_logger.LogInformation("正在断开所有 OPC UA 会话...");
|
||||
var closeTasks = new List<Task>();
|
||||
|
||||
foreach (var endpointUrl in _opcUaSessions.Keys.ToList())
|
||||
{
|
||||
closeTasks.Add(Task.Run(async () =>
|
||||
{
|
||||
_logger.LogInformation($"正在断开 OPC UA 会话: {endpointUrl}");
|
||||
if (_opcUaSessions.TryRemove(endpointUrl, out var session))
|
||||
{
|
||||
if (_opcUaSubscriptions.TryRemove(endpointUrl, out var subscription))
|
||||
{
|
||||
// 删除订阅。
|
||||
await subscription.DeleteAsync(true);
|
||||
}
|
||||
|
||||
// 关闭会话。
|
||||
await session.CloseAsync();
|
||||
_logger.LogInformation($"已从 OPC UA 服务器断开连接: {endpointUrl}");
|
||||
}
|
||||
}));
|
||||
}
|
||||
|
||||
await Task.WhenAll(closeTasks);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user