From dabdbca566030c438ddc414c78a0af5c42eebabe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=9B=BD=E4=BC=9F?= <366193849@qq.com>
Date: Thu, 18 Nov 2021 12:51:33 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AB=AF=E5=8F=A3=E7=BC=93=E5=AD=98?=
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---
 FastGithub.Configuration/ReverseProxyPort.cs | 56 ++++++++++++++------
 1 file changed, 39 insertions(+), 17 deletions(-)

diff --git a/FastGithub.Configuration/ReverseProxyPort.cs b/FastGithub.Configuration/ReverseProxyPort.cs
index aa6e7fc..644ebca 100644
--- a/FastGithub.Configuration/ReverseProxyPort.cs
+++ b/FastGithub.Configuration/ReverseProxyPort.cs
@@ -13,42 +13,64 @@ namespace FastGithub.Configuration
         /// <summary>
         /// ssh端口
         /// </summary>
-        public static int Ssh { get; } = OperatingSystem.IsWindows() ? GetAvailableTcpPort(22) : GetAvailableTcpPort(3822);
+        public static int Ssh { get; }
 
         /// <summary>
         /// http端口
         /// </summary>
-        public static int Http { get; } = OperatingSystem.IsWindows() ? GetAvailableTcpPort(80) : GetAvailableTcpPort(3880);
+        public static int Http { get; }
 
         /// <summary>
         /// https端口
         /// </summary>
-        public static int Https { get; } = OperatingSystem.IsWindows() ? GetAvailableTcpPort(443) : GetAvailableTcpPort(38443);
+        public static int Https { get; }
 
         /// <summary>
-        /// 获取可用的随机Tcp端口
+        /// 反向代理端口
         /// </summary>
-        /// <param name="minValue"></param> 
-        /// <returns></returns>
-        private static int GetAvailableTcpPort(int minValue)
+        static ReverseProxyPort()
         {
-            var hashSet = new HashSet<int>();
-            var tcpListeners = IPGlobalProperties.GetIPGlobalProperties().GetActiveTcpListeners();
+            var ports = new TcpListenerPortCollection();
+            Ssh = OperatingSystem.IsWindows() ? ports.GetAvailablePort(22) : ports.GetAvailablePort(3822);
+            Http = OperatingSystem.IsWindows() ? ports.GetAvailablePort(80) : ports.GetAvailablePort(3880);
+            Https = OperatingSystem.IsWindows() ? ports.GetAvailablePort(443) : ports.GetAvailablePort(38443);
+        }
 
-            foreach (var endpoint in tcpListeners)
-            {
-                hashSet.Add(endpoint.Port);
-            }
+        /// <summary>
+        /// 已监听的tcp端口集合
+        /// </summary>
+        private class TcpListenerPortCollection
+        {
+            private readonly HashSet<int> tcpPorts = new();
 
-            for (var port = minValue; port < IPEndPoint.MaxPort; port++)
+            /// <summary>
+            /// 已监听的tcp端口集合
+            /// </summary>
+            public TcpListenerPortCollection()
             {
-                if (hashSet.Contains(port) == false)
+                var tcpListeners = IPGlobalProperties.GetIPGlobalProperties().GetActiveTcpListeners();
+                foreach (var endpoint in tcpListeners)
                 {
-                    return port;
+                    this.tcpPorts.Add(endpoint.Port);
                 }
             }
 
-            throw new FastGithubException("当前无可用的端口");
+            /// <summary>
+            /// 获取可用的随机Tcp端口
+            /// </summary>
+            /// <param name="minValue"></param> 
+            /// <returns></returns>
+            public int GetAvailablePort(int minValue)
+            {
+                for (var port = minValue; port < IPEndPoint.MaxPort; port++)
+                {
+                    if (this.tcpPorts.Contains(port) == false)
+                    {
+                        return port;
+                    }
+                }
+                throw new FastGithubException("当前无可用的端口");
+            }
         }
     }
 }