refactor: 优化SSE推送性能

- 使用List<T>和lock替换ConcurrentQueue<T>来存储消息，以支持高效的范围读取。
- 移除了有性能隐患的IEnumerable消息属性，替换为专用的GetNew...Messages方法。
- 控制器调用新方法，避免了在循环中通过LINQ Skip遍历集合，显著提升了服务器性能。

LTEMvcApp/Controllers/WebSocketController.cs

@@ -3,6 +3,7 @@ using LTEMvcApp.Models;
 using LTEMvcApp.Services;
 using Newtonsoft.Json.Linq;
 using Microsoft.Extensions.Logging;
+using System.Threading.Tasks;
 
 namespace LTEMvcApp.Controllers
 {
@@ -244,41 +245,73 @@ namespace LTEMvcApp.Controllers
         }
 
         /// <summary>
-        /// 获取客户端消息队列
+        /// 使用 Server-Sent Events (SSE) 实时推送客户端消息
         /// </summary>
         /// <param name="clientName">客户端名称</param>
-        /// <param name="sentStartIndex">发送消息起始索引</param>
-        /// <param name="receivedStartIndex">接收消息起始索引</param>
-        /// <returns>发送和接收的消息队列</returns>
-        [HttpGet("clients/{clientName}/messages")]
-        public ActionResult<object> GetClientMessages(string clientName, [FromQuery] int sentStartIndex = 0, [FromQuery] int receivedStartIndex = 0)
+        [HttpGet("clients/{clientName}/messages/stream")]
+        public async Task StreamClientMessages(string clientName)
         {
+            Response.ContentType = "text/event-stream";
+            Response.Headers.Add("Cache-Control", "no-cache");
+            Response.Headers.Add("Connection", "keep-alive");
+
             var client = _webSocketManager.GetClientInstance(clientName);
             if (client == null)
             {
-                // 即使客户端未连接，也可能是在配置页面中查看，所以返回空而不是404
-                return Ok(new
-                {
-                    SentMessages = new List<string>(),
-                    ReceivedMessages = new List<string>(),
-                    SentCount = 0,
-                    ReceivedCount = 0
-                });
+                // 发送一个错误事件然后关闭
+                await SendSseEvent("error", new { message = "客户端未连接或不存在" });
+                return;
             }
 
-            var sentMessages = client.SentMessages.ToList();
-            var receivedMessages = client.ReceivedMessages.ToList();
+            // 发送一个连接成功事件
+            await SendSseEvent("open", new { message = "成功连接到服务器事件流" });
 
-            var newSent = sentMessages.Skip(sentStartIndex).ToList();
-            var newReceived = receivedMessages.Skip(receivedStartIndex).ToList();
+            int sentIndex = 0;
+            int receivedIndex = 0;
+            var cancellationToken = HttpContext.RequestAborted;
 
-            return Ok(new
+            while (!cancellationToken.IsCancellationRequested)
             {
-                NewSentMessages = newSent,
-                NewReceivedMessages = newReceived,
-                TotalSentCount = sentMessages.Count,
-                TotalReceivedCount = receivedMessages.Count
-            });
+                bool hasNewMessages = false;
+
+                // 检查并高效地发送新的"已发送"消息
+                if (client.SentMessagesCount > sentIndex)
+                {
+                    var newMessages = client.GetNewSentMessages(sentIndex);
+                    if (newMessages.Any())
+                    {
+                        await SendSseEvent("update", new { type = "sent", messages = newMessages, totalCount = client.SentMessagesCount });
+                        sentIndex = client.SentMessagesCount;
+                        hasNewMessages = true;
+                    }
+                }
+
+                // 检查并高效地发送新的"已接收"消息
+                if (client.ReceivedMessagesCount > receivedIndex)
+                {
+                    var newMessages = client.GetNewReceivedMessages(receivedIndex);
+                    if (newMessages.Any())
+                    {
+                        await SendSseEvent("update", new { type = "received", messages = newMessages, totalCount = client.ReceivedMessagesCount });
+                        receivedIndex = client.ReceivedMessagesCount;
+                        hasNewMessages = true;
+                    }
+                }
+
+                if (hasNewMessages)
+                {
+                    await Response.Body.FlushAsync(cancellationToken);
+                }
+
+                await Task.Delay(250, cancellationToken); // 每250毫秒检查一次新消息
+            }
+        }
+
+        private async Task SendSseEvent(string eventName, object data)
+        {
+            var json = Newtonsoft.Json.JsonConvert.SerializeObject(data);
+            await Response.WriteAsync($"event: {eventName}\n");
+            await Response.WriteAsync($"data: {json}\n\n");
         }
 
         /// <summary>

LTEMvcApp/Services/LTEClientWebSocket.cs

@@ -36,8 +36,10 @@ namespace LTEMvcApp.Services
         private bool _disposed;
         private LogParserService logParser = new LogParserService();
         private readonly ILogger<LTEClientWebSocket> _logger;
-        private readonly ConcurrentQueue<string> _sentMessages = new ConcurrentQueue<string>();
-        private readonly ConcurrentQueue<string> _receivedMessages = new ConcurrentQueue<string>();
+        private readonly List<string> _sentMessages = new List<string>();
+        private readonly object _sentLock = new object();
+        private readonly List<string> _receivedMessages = new List<string>();
+        private readonly object _receivedLock = new object();
         #endregion
 
         #region 事件
@@ -116,8 +118,40 @@ namespace LTEMvcApp.Services
         /// </summary>
         public bool IsReadonly => _config.Readonly;
 
-        public IEnumerable<string> SentMessages => _sentMessages;
-        public IEnumerable<string> ReceivedMessages => _receivedMessages;
+        public int SentMessagesCount
+        {
+            get { lock (_sentLock) { return _sentMessages.Count; } }
+        }
+        public int ReceivedMessagesCount
+        {
+            get { lock (_receivedLock) { return _receivedMessages.Count; } }
+        }
+
+        public List<string> GetNewSentMessages(int startIndex)
+        {
+            lock (_sentLock)
+            {
+                var count = _sentMessages.Count - startIndex;
+                if (count > 0)
+                {
+                    return _sentMessages.GetRange(startIndex, count);
+                }
+                return new List<string>();
+            }
+        }
+
+        public List<string> GetNewReceivedMessages(int startIndex)
+        {
+            lock (_receivedLock)
+            {
+                var count = _receivedMessages.Count - startIndex;
+                if (count > 0)
+                {
+                    return _receivedMessages.GetRange(startIndex, count);
+                }
+                return new List<string>();
+            }
+        }
 
         #endregion
 
@@ -364,7 +398,10 @@ namespace LTEMvcApp.Services
             _messageFifo.Enqueue(message);
 
             // 记录发送的消息
-            _sentMessages.Enqueue(message.ToString(Formatting.Indented));
+            lock (_sentLock)
+            {
+                _sentMessages.Add(message.ToString(Formatting.Indented));
+            }
 
             if (_messageFifo.Count < 100) // 批处理大小
             {
@@ -499,7 +536,10 @@ namespace LTEMvcApp.Services
             StopTimers();
 
             // 记录接收的消息
-            _receivedMessages.Enqueue(JToken.Parse(e.Message).ToString(Formatting.Indented));
+            lock (_receivedLock)
+            {
+                _receivedMessages.Add(JToken.Parse(e.Message).ToString(Formatting.Indented));
+            }
 
             try
             {
@@ -659,7 +699,10 @@ namespace LTEMvcApp.Services
         {
             _logger.LogDebug($"[{_config.Name}] 收到消息: {e.Message}");
             // 记录接收的消息
-            _receivedMessages.Enqueue(JToken.Parse(e.Message).ToString(Formatting.Indented));
+            lock (_receivedLock)
+            {
+                _receivedMessages.Add(JToken.Parse(e.Message).ToString(Formatting.Indented));
+            }
             try
             {
                 var data = e.Message;
@@ -853,14 +896,20 @@ namespace LTEMvcApp.Services
                 var json = JsonConvert.SerializeObject(messages[0]);
                 _webSocket.Send(json);
                 // 记录发送的消息
-                _sentMessages.Enqueue(JToken.Parse(json).ToString(Formatting.Indented));
+                lock (_sentLock)
+                {
+                    _sentMessages.Add(JToken.Parse(json).ToString(Formatting.Indented));
+                }
             }
             else if (messages.Count > 1)
             {
                 var json = JsonConvert.SerializeObject(messages);
                 _webSocket.Send(json);
                 // 记录发送的消息
-                _sentMessages.Enqueue(JToken.Parse(json).ToString(Formatting.Indented));
+                lock (_sentLock)
+                {
+                    _sentMessages.Add(JToken.Parse(json).ToString(Formatting.Indented));
+                }
             }
 
             _messageDeferTimer?.Dispose();

LTEMvcApp/Views/Home/ClientMessages.cshtml

@@ -10,10 +10,8 @@
                 <div class="card-header">
                     <h3 class="card-title">客户端消息队列 - @clientName</h3>
                     <div class="card-tools">
-                        <button type="button" class="btn btn-primary btn-sm" onclick="refreshMessages()">
-                            <i class="fas fa-sync-alt"></i> 刷新
-                        </button>
-                        <a href="@Url.Action("TestClientConfig", "Home")" class="btn btn-info btn-sm">
+                        <span id="connection-status" class="badge badge-secondary">正在连接...</span>
+                        <a href="@Url.Action("TestClientConfig", "Home")" class="btn btn-info btn-sm ml-2">
                             <i class="fas fa-cog"></i> 配置
                         </a>
                     </div>
@@ -31,7 +29,7 @@
                                 <div class="card-body" style="max-height: 600px; overflow-y: auto;">
                                     <div id="sentMessages">
                                         <div class="text-muted text-center">
-                                            <i class="fas fa-info-circle"></i> 暂无发送消息
+                                            <i class="fas fa-spinner fa-spin"></i> 正在建立与服务器的连接...
                                         </div>
                                     </div>
                                 </div>
@@ -48,7 +46,7 @@
                                 <div class="card-body" style="max-height: 600px; overflow-y: auto;">
                                     <div id="receivedMessages">
                                         <div class="text-muted text-center">
-                                            <i class="fas fa-info-circle"></i> 暂无接收消息
+                                            <i class="fas fa-spinner fa-spin"></i> 正在建立与服务器的连接...
                                         </div>
                                     </div>
                                 </div>
@@ -65,54 +63,43 @@
     <script>
         const clientName = '@clientName';
         const MAX_MESSAGES = 500; // 每个列表最多显示500条消息
-        let sentIndex = 0;
-        let receivedIndex = 0;
-        let updateInterval;
 
         $(document).ready(function() {
-            // 立即加载一次，然后每秒请求增量更新
-            loadInitialMessages();
-            updateInterval = setInterval(loadIncrementalMessages, 1000); // 1秒更新一次
+            initializeEventSource();
         });
-        
-        // 首次加载
-        function loadInitialMessages() {
-            // 清空现有内容
-            $('#sentMessages').empty();
-            $('#receivedMessages').empty();
-            sentIndex = 0;
-            receivedIndex = 0;
-            
-            // 加载所有消息
-            loadMessages(true);
-        }
 
-        // 增量加载
-        function loadIncrementalMessages() {
-            loadMessages(false);
-        }
+        function initializeEventSource() {
+            $('#sentMessages').html('<div class="text-muted text-center"><i class="fas fa-spinner fa-spin"></i> 正在建立与服务器的连接...</div>');
+            $('#receivedMessages').html('<div class="text-muted text-center"><i class="fas fa-spinner fa-spin"></i> 正在建立与服务器的连接...</div>');
+
+            const source = new EventSource(`/api/websocket/clients/${encodeURIComponent(clientName)}/messages/stream`);
+            const statusBadge = $('#connection-status');
+
+            source.addEventListener('open', function(e) {
+                console.log("SSE connection opened.");
+                statusBadge.removeClass('badge-secondary badge-danger').addClass('badge-success').text('已连接');
+                // 清空等待消息
+                $('#sentMessages').empty();
+                $('#receivedMessages').empty();
+            });
 
-        function loadMessages(isInitial) {
-            $.ajax({
-                url: `/api/websocket/clients/${encodeURIComponent(clientName)}/messages?sentStartIndex=${sentIndex}&receivedStartIndex=${receivedIndex}`,
-                type: 'GET',
-                success: function(data) {
-                    updateMessageList('sent', data.newSentMessages, data.totalSentCount, isInitial);
-                    updateMessageList('received', data.newReceivedMessages, data.totalReceivedCount, isInitial);
-
-                    // 更新下一次请求的起始索引
-                    sentIndex = data.totalSentCount;
-                    receivedIndex = data.totalReceivedCount;
-                },
-                error: handleAjaxError
+            source.addEventListener('update', function(e) {
+                const data = JSON.parse(e.data);
+                updateMessageList(data.type, data.messages, data.totalCount);
+            });
+            
+            source.addEventListener('error', function(e) {
+                statusBadge.removeClass('badge-success').addClass('badge-danger').text('连接断开');
+                if (e.target.readyState === EventSource.CLOSED) {
+                    console.error("SSE connection closed.");
+                } else {
+                    console.error("SSE error:", e);
+                }
+                 // EventSource 会自动尝试重连
             });
         }
-        
-        function updateMessageList(type, newMessages, totalCount, isInitial) {
-            if (isInitial && newMessages.length === 0) {
-                 $(`#${type}Messages`).html('<div class="text-muted text-center"><i class="fas fa-info-circle"></i> 暂无消息</div>');
-            }
-        
+
+        function updateMessageList(type, newMessages, totalCount) {
             if (!newMessages || newMessages.length === 0) {
                 $(`#${type}Count`).text(totalCount);
                 return;
@@ -120,13 +107,14 @@
 
             const container = $(`#${type}Messages`);
             const fragment = $(document.createDocumentFragment());
-            
-            // 如果是首次加载，先移除"暂无消息"的提示
-            if (isInitial) {
+
+            // 移除 "暂无消息" 或 "正在连接" 的提示
+            if (container.children().length === 1 && !container.children().first().hasClass('card')) {
                 container.empty();
             }
 
-            let currentIndex = (type === 'sent' ? sentIndex : receivedIndex);
+            let currentIndex = totalCount - newMessages.length;
+
             newMessages.forEach(function(message) {
                 const card = createMessageCard(message, currentIndex, type);
                 fragment.append(card);
@@ -134,13 +122,13 @@
             });
 
             container.append(fragment);
-            
-            // 数量限制
+
+            // 限制DOM节点数量
             const messageCards = container.children('.card');
             if (messageCards.length > MAX_MESSAGES) {
                 messageCards.slice(0, messageCards.length - MAX_MESSAGES).remove();
             }
-            
+
             $(`#${type}Count`).text(totalCount);
             
             // 高亮新添加的代码
@@ -150,12 +138,6 @@
                 }
             });
         }
-        
-        function handleAjaxError(xhr) {
-             if (xhr.status !== 404) { // 忽略404，因为它可能是客户端未连接的正常状态
-                console.error("加载消息失败:", xhr.responseText);
-             }
-        }
 
         function createMessageCard(message, index, type) {
             const timestamp = new Date().toLocaleTimeString();
@@ -178,7 +160,7 @@
                     </div>
                 </div>
             `;
-            return $(cardHtml); // 返回jQuery对象
+            return $(cardHtml);
         }
 
         function toggleMessage(button) {
@@ -194,7 +176,7 @@
                 return jsonString;
             }
         }
-        
+
         function escapeHtml(text) {
           return text
               .replace(/&/g, "&amp;")
@@ -203,20 +185,6 @@
               .replace(/"/g, "&quot;")
               .replace(/'/g, "&#039;");
         }
-
-        function refreshMessages() {
-            // 停止自动更新，手动刷新，然后重新开始
-            clearInterval(updateInterval);
-            loadInitialMessages();
-            updateInterval = setInterval(loadIncrementalMessages, 1000);
-        }
-
-        // 页面卸载时清除定时器
-        $(window).on('beforeunload', function() {
-            if (updateInterval) {
-                clearInterval(updateInterval);
-            }
-        });
     </script>
 
     <!-- 添加代码高亮支持 -->