修复了已知的bug

Serein.Proto.HttpApi/RequestLimiter.cs

@@ -0,0 +1,59 @@
+using System.Collections.Concurrent;
+using System.Net;
+
+namespace Serein.Proto.HttpApi
+{
+    /// <summary>
+    /// 判断访问接口的频次是否正常
+    /// </summary>
+    public class RequestLimiter
+    {
+        private readonly ConcurrentDictionary<string, Queue<DateTime>> requestHistory = new ConcurrentDictionary<string, Queue<DateTime>>();
+        private readonly TimeSpan interval;
+        private readonly int maxRequests;
+
+        public RequestLimiter(int seconds, int maxRequests)
+        {
+            interval = TimeSpan.FromSeconds(seconds);
+            this.maxRequests = maxRequests;
+        }
+
+        /// <summary>
+        /// 判断访问接口的频次是否正常
+        /// </summary>
+        /// <returns></returns>
+        public bool AllowRequest(HttpListenerRequest request)
+        {
+            var clientIp = request.RemoteEndPoint.Address.ToString();
+            var clientPort = request.RemoteEndPoint.Port;
+            var clientKey = clientIp + ":" + clientPort;
+
+            var now = DateTime.Now;
+
+            // 尝试从字典中获取请求队列，不存在则创建新的队列
+            var requests = requestHistory.GetOrAdd(clientKey, new Queue<DateTime>());
+
+            lock (requests)
+            {
+                // 移除超出时间间隔的请求记录
+                while (requests.Count > 0 && now - requests.Peek() > interval)
+                {
+                    requests.Dequeue();
+                }
+
+                // 如果请求数超过限制，拒绝请求
+                if (requests.Count >= maxRequests)
+                {
+                    return false;
+                }
+
+                // 添加当前请求时间，并允许请求
+                requests.Enqueue(now);
+            }
+
+            return true;
+
+        }
+
+    }
+}