修复 WebSocketMiddleware 缓冲区问题：1) 统一缓冲区大小为 MaxMessageSize 2) 移除共享消息缓冲区，改为每个消息创建独立缓冲区 3) 使用 using 语句确保资源正确释放

src/X1.WebSocket/Middleware/WebSocketMiddleware.cs

@@ -73,7 +73,8 @@ public class WebSocketMiddleware
     private readonly IWebSocketMessageQueueManager _messageQueueManager;
     private readonly ILogger<WebSocketMiddleware> _logger;
     private readonly WebSocketOptions _options;
-    private readonly WebSocketMessageBuffer _messageBuffer;
+    // 移除共享的消息缓冲区，改为每个连接创建独立的缓冲区
+    // private readonly WebSocketMessageBuffer _messageBuffer;
     private readonly WebSocketErrorHandler _errorHandler;
     private readonly WebSocketPerformanceMonitor _performanceMonitor;
     // 使用 WebSocket Channel 管理器来管理 Channel 的生命周期
@@ -100,7 +101,6 @@ public class WebSocketMiddleware
         _messageQueueManager = messageQueueManager;
         _logger = logger;
         _options = options.Value;
-        _messageBuffer = new WebSocketMessageBuffer(_options.MaxMessageSize);
         _errorHandler = new WebSocketErrorHandler(logger, _options.MessageRetryCount, _options.MessageRetryInterval);
         _performanceMonitor = new WebSocketPerformanceMonitor(logger);
         
@@ -170,7 +170,7 @@ public class WebSocketMiddleware
         // 使用原子操作的状态标志，确保线程安全
         var processingState = new AtomicBoolean(false);
         // 从内存池租借缓冲区，用于接收消息
-        var buffer = ArrayPool<byte>.Shared.Rent(1024 * 4);
+        var buffer = ArrayPool<byte>.Shared.Rent(_options.MaxMessageSize);
         // 使用 Channel 管理器创建新的消息通道
         var messageChannel = await _channelManager.CreateNewMessageChannel(connectionId);
         
@@ -390,7 +390,10 @@ public class WebSocketMiddleware
 
         var success = await _errorHandler.HandleWithRetryAsync(async () =>
         {
-            if (!_messageBuffer.TryWrite(buffer, 0, receiveResult.Count))
+            // 为每个消息创建独立的消息缓冲区，避免并发问题
+            using var messageBuffer = new WebSocketMessageBuffer(_options.MaxMessageSize);
+            
+            if (!messageBuffer.TryWrite(buffer, 0, receiveResult.Count))
             {
                 throw new WebSocketException("消息缓冲区溢出");
             }
@@ -400,7 +403,7 @@ public class WebSocketMiddleware
                 var message = new WebSocketMessage
                 {
                     ConnectionId = connectionId,
-                    Data = _messageBuffer.GetMessage(),
+                    Data = messageBuffer.GetMessage(),
                     MessageType = receiveResult.MessageType,
                     IsComplete = true
                 };
@@ -416,8 +419,7 @@ public class WebSocketMiddleware
                 // 记录 Channel 消息处理统计
                 _channelManager.RecordMessageProcessed(messageChannel, message.Data.Length);
 
-                _messageBuffer.Reset();
-                //messageStartTime = DateTime.UtcNow;
+                // messageBuffer 会在 using 语句中自动释放
             }
         });