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| 1 | +using System; |
| 2 | +using System.Collections.Concurrent; |
| 3 | +using System.Text; |
| 4 | +using System.Text.Json; |
| 5 | +using System.Threading; |
| 6 | +using System.Threading.Tasks; |
| 7 | +using Cyaim.WebSocketServer.Infrastructure.Cluster; |
| 8 | +using Cyaim.WebSocketServer.Infrastructure.Configures; |
| 9 | +using Microsoft.Extensions.Logging; |
| 10 | +using FreeRedis; |
| 11 | +using ClusterNode = Cyaim.WebSocketServer.Infrastructure.Cluster.ClusterNode; |
| 12 | + |
| 13 | +namespace Cyaim.WebSocketServer.Cluster.FreeRedis |
| 14 | +{ |
| 15 | + /// <summary> |
| 16 | + /// FreeRedis-based cluster transport (using Redis Pub/Sub) |
| 17 | + /// 基于 FreeRedis 的集群传输（使用 Redis 发布/订阅） |
| 18 | + /// </summary> |
| 19 | + public class FreeRedisClusterTransport : IClusterTransport |
| 20 | + { |
| 21 | + private readonly ILogger<FreeRedisClusterTransport> _logger; |
| 22 | + private readonly string _nodeId; |
| 23 | + private readonly string _connectionString; |
| 24 | + private readonly ConcurrentDictionary<string, ClusterNode> _nodes; |
| 25 | + private readonly CancellationTokenSource _cancellationTokenSource; |
| 26 | + private bool _disposed = false; |
| 27 | + |
| 28 | + /// <summary> |
| 29 | + /// Redis client / Redis 客户端 |
| 30 | + /// </summary> |
| 31 | + private RedisClient _redis; |
| 32 | + |
| 33 | + /// <summary> |
| 34 | + /// Event triggered when message received / 消息接收时触发的事件 |
| 35 | + /// </summary> |
| 36 | + public event EventHandler<ClusterMessageEventArgs> MessageReceived; |
| 37 | + /// <summary> |
| 38 | + /// Event triggered when node connected / 节点连接时触发的事件 |
| 39 | + /// </summary> |
| 40 | + public event EventHandler<ClusterNodeEventArgs> NodeConnected; |
| 41 | + /// <summary> |
| 42 | + /// Event triggered when node disconnected / 节点断开连接时触发的事件 |
| 43 | + /// </summary> |
| 44 | + public event EventHandler<ClusterNodeEventArgs> NodeDisconnected; |
| 45 | + |
| 46 | + /// <summary> |
| 47 | + /// Constructor / 构造函数 |
| 48 | + /// </summary> |
| 49 | + /// <param name="logger">Logger instance / 日志实例</param> |
| 50 | + /// <param name="nodeId">Node ID / 节点 ID</param> |
| 51 | + /// <param name="connectionString">Redis connection string / Redis 连接字符串</param> |
| 52 | + public FreeRedisClusterTransport(ILogger<FreeRedisClusterTransport> logger, string nodeId, string connectionString) |
| 53 | + { |
| 54 | + _logger = logger ?? throw new ArgumentNullException(nameof(logger)); |
| 55 | + _nodeId = nodeId ?? throw new ArgumentNullException(nameof(nodeId)); |
| 56 | + _connectionString = connectionString ?? throw new ArgumentNullException(nameof(connectionString)); |
| 57 | + _nodes = new ConcurrentDictionary<string, ClusterNode>(); |
| 58 | + _cancellationTokenSource = new CancellationTokenSource(); |
| 59 | + } |
| 60 | + |
| 61 | + /// <summary> |
| 62 | + /// Start the transport service / 启动传输服务 |
| 63 | + /// </summary> |
| 64 | + public async Task StartAsync() |
| 65 | + { |
| 66 | + _logger.LogInformation($"Starting FreeRedis cluster transport for node {_nodeId}"); |
| 67 | + |
| 68 | + try |
| 69 | + { |
| 70 | + _redis = new RedisClient(_connectionString); |
| 71 | + |
| 72 | + // Subscribe to node-specific channel / 订阅节点特定通道 |
| 73 | + _redis.Subscribe($"cluster:node:{_nodeId}", (channel, message) => |
| 74 | + { |
| 75 | + try |
| 76 | + { |
| 77 | + var clusterMessage = JsonSerializer.Deserialize<ClusterMessage>(message); |
| 78 | + MessageReceived?.Invoke(this, new ClusterMessageEventArgs |
| 79 | + { |
| 80 | + FromNodeId = clusterMessage.FromNodeId, |
| 81 | + Message = clusterMessage |
| 82 | + }); |
| 83 | + } |
| 84 | + catch (Exception ex) |
| 85 | + { |
| 86 | + _logger.LogError(ex, "Failed to process FreeRedis message"); |
| 87 | + } |
| 88 | + }); |
| 89 | + |
| 90 | + // Subscribe to broadcast channel / 订阅广播通道 |
| 91 | + _redis.Subscribe("cluster:broadcast", (channel, message) => |
| 92 | + { |
| 93 | + try |
| 94 | + { |
| 95 | + var clusterMessage = JsonSerializer.Deserialize<ClusterMessage>(message); |
| 96 | + if (clusterMessage.FromNodeId != _nodeId) |
| 97 | + { |
| 98 | + MessageReceived?.Invoke(this, new ClusterMessageEventArgs |
| 99 | + { |
| 100 | + FromNodeId = clusterMessage.FromNodeId, |
| 101 | + Message = clusterMessage |
| 102 | + }); |
| 103 | + } |
| 104 | + } |
| 105 | + catch (Exception ex) |
| 106 | + { |
| 107 | + _logger.LogError(ex, "Failed to process FreeRedis broadcast message"); |
| 108 | + } |
| 109 | + }); |
| 110 | + |
| 111 | + _logger.LogInformation($"FreeRedis cluster transport started successfully for node {_nodeId}"); |
| 112 | + } |
| 113 | + catch (Exception ex) |
| 114 | + { |
| 115 | + _logger.LogError(ex, "Failed to start FreeRedis cluster transport"); |
| 116 | + throw; |
| 117 | + } |
| 118 | + |
| 119 | + await Task.CompletedTask; |
| 120 | + } |
| 121 | + |
| 122 | + /// <summary> |
| 123 | + /// Stop the transport service / 停止传输服务 |
| 124 | + /// </summary> |
| 125 | + public async Task StopAsync() |
| 126 | + { |
| 127 | + _logger.LogInformation($"Stopping FreeRedis cluster transport for node {_nodeId}"); |
| 128 | + _cancellationTokenSource.Cancel(); |
| 129 | + |
| 130 | + try |
| 131 | + { |
| 132 | + if (_redis != null) |
| 133 | + { |
| 134 | + _redis.UnSubscribe($"cluster:node:{_nodeId}"); |
| 135 | + _redis.UnSubscribe("cluster:broadcast"); |
| 136 | + _redis.Dispose(); |
| 137 | + _redis = null; |
| 138 | + } |
| 139 | + |
| 140 | + _nodes.Clear(); |
| 141 | + } |
| 142 | + catch (Exception ex) |
| 143 | + { |
| 144 | + _logger.LogError(ex, "Error stopping FreeRedis cluster transport"); |
| 145 | + } |
| 146 | + |
| 147 | + await Task.CompletedTask; |
| 148 | + } |
| 149 | + |
| 150 | + /// <summary> |
| 151 | + /// Send message to specific node / 向指定节点发送消息 |
| 152 | + /// </summary> |
| 153 | + /// <param name="nodeId">Target node ID / 目标节点 ID</param> |
| 154 | + /// <param name="message">Message to send / 要发送的消息</param> |
| 155 | + public async Task SendAsync(string nodeId, ClusterMessage message) |
| 156 | + { |
| 157 | + if (string.IsNullOrEmpty(nodeId)) |
| 158 | + throw new ArgumentNullException(nameof(nodeId)); |
| 159 | + |
| 160 | + message.FromNodeId = _nodeId; |
| 161 | + message.ToNodeId = nodeId; |
| 162 | + var messageJson = JsonSerializer.Serialize(message); |
| 163 | + |
| 164 | + try |
| 165 | + { |
| 166 | + if (_redis == null || !_redis.IsConnected) |
| 167 | + { |
| 168 | + _logger.LogWarning("FreeRedis client is not initialized or connected"); |
| 169 | + return; |
| 170 | + } |
| 171 | + |
| 172 | + _redis.Publish($"cluster:node:{nodeId}", messageJson); |
| 173 | + |
| 174 | + _logger.LogDebug($"Sent message to node {nodeId} via FreeRedis"); |
| 175 | + } |
| 176 | + catch (Exception ex) |
| 177 | + { |
| 178 | + _logger.LogError(ex, $"Failed to send message to node {nodeId} via FreeRedis"); |
| 179 | + throw; |
| 180 | + } |
| 181 | + |
| 182 | + await Task.CompletedTask; |
| 183 | + } |
| 184 | + |
| 185 | + /// <summary> |
| 186 | + /// Broadcast message to all nodes / 向所有节点广播消息 |
| 187 | + /// </summary> |
| 188 | + /// <param name="message">Message to broadcast / 要广播的消息</param> |
| 189 | + public async Task BroadcastAsync(ClusterMessage message) |
| 190 | + { |
| 191 | + message.FromNodeId = _nodeId; |
| 192 | + var messageJson = JsonSerializer.Serialize(message); |
| 193 | + |
| 194 | + try |
| 195 | + { |
| 196 | + if (_redis == null || !_redis.IsConnected) |
| 197 | + { |
| 198 | + _logger.LogWarning("FreeRedis client is not initialized or connected"); |
| 199 | + return; |
| 200 | + } |
| 201 | + |
| 202 | + _redis.Publish("cluster:broadcast", messageJson); |
| 203 | + |
| 204 | + _logger.LogDebug("Broadcasted message via FreeRedis"); |
| 205 | + } |
| 206 | + catch (Exception ex) |
| 207 | + { |
| 208 | + _logger.LogError(ex, "Failed to broadcast message via FreeRedis"); |
| 209 | + throw; |
| 210 | + } |
| 211 | + |
| 212 | + await Task.CompletedTask; |
| 213 | + } |
| 214 | + |
| 215 | + /// <summary> |
| 216 | + /// Check if node is connected / 检查节点是否已连接 |
| 217 | + /// </summary> |
| 218 | + /// <param name="nodeId">Node ID to check / 要检查的节点 ID</param> |
| 219 | + /// <returns>True if connected, false otherwise / 已连接返回 true，否则返回 false</returns> |
| 220 | + public bool IsNodeConnected(string nodeId) |
| 221 | + { |
| 222 | + // With FreeRedis, we consider a node connected if it's registered |
| 223 | + // 对于 FreeRedis，如果节点已注册，我们认为它已连接 |
| 224 | + // In practice, you might want to track node health separately |
| 225 | + // 在实践中，您可能需要单独跟踪节点健康状况 |
| 226 | + return _nodes.ContainsKey(nodeId); |
| 227 | + } |
| 228 | + |
| 229 | + /// <summary> |
| 230 | + /// Register a node / 注册节点 |
| 231 | + /// </summary> |
| 232 | + /// <param name="node">Node information / 节点信息</param> |
| 233 | + public void RegisterNode(ClusterNode node) |
| 234 | + { |
| 235 | + if (node == null) |
| 236 | + throw new ArgumentNullException(nameof(node)); |
| 237 | + |
| 238 | + _nodes.AddOrUpdate(node.NodeId, node, (key, oldValue) => node); |
| 239 | + NodeConnected?.Invoke(this, new ClusterNodeEventArgs { NodeId = node.NodeId }); |
| 240 | + _logger.LogDebug($"Registered node {node.NodeId} in FreeRedis transport"); |
| 241 | + } |
| 242 | + |
| 243 | + /// <summary> |
| 244 | + /// Dispose resources / 释放资源 |
| 245 | + /// </summary> |
| 246 | + public void Dispose() |
| 247 | + { |
| 248 | + if (!_disposed) |
| 249 | + { |
| 250 | + StopAsync().GetAwaiter().GetResult(); |
| 251 | + _cancellationTokenSource.Dispose(); |
| 252 | + _disposed = true; |
| 253 | + } |
| 254 | + } |
| 255 | + } |
| 256 | +} |
| 257 | + |
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