Resolve hostname to IP address in MemcachedClientConfiguration

Author: cnblogs-dudu

Enyim.Caching/Configuration/MemcachedClientConfiguration.cs

@@ -7,6 +7,8 @@
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Microsoft.Extensions.Configuration;
+using System.Linq;
+using System.Net.Sockets;
 
 namespace Enyim.Caching.Configuration
 {
@@ -41,23 +43,19 @@ public MemcachedClientConfiguration(
             var options = optionsAccessor.Value;
             if ((options == null || options.Servers.Count == 0) && configuration != null)
             {
-                var section = configuration.GetSection("enyimMemcached");                
+                var section = configuration.GetSection("enyimMemcached");
                 if (section.Exists())
                 {
-                    section.Bind(options);                    
+                    section.Bind(options);
                 }
                 else
                 {
                     _logger.LogWarning($"No enyimMemcached setting in appsetting.json. Use default configuration");
                     options.AddDefaultServer();
-                }                
+                }
             }
 
-            Servers = new List<DnsEndPoint>();
-            foreach (var server in options.Servers)
-            {
-                Servers.Add(new DnsEndPoint(server.Address, server.Port));
-            }
+            ConfigureServers(options);
 
             SocketPool = new SocketPoolConfiguration();
             if (options.SocketPool != null)
@@ -172,6 +170,35 @@ public MemcachedClientConfiguration(
             }
         }
 
+        private void ConfigureServers(MemcachedClientOptions options)
+        {
+            Servers = new List<DnsEndPoint>();
+            foreach (var server in options.Servers)
+            {
+                if (!IPAddress.TryParse(server.Address, out var address))
+                {
+                    var ip = Dns.GetHostAddresses(server.Address)
+                        .FirstOrDefault(i => i.AddressFamily == AddressFamily.InterNetwork)?.ToString();
+
+                    if (ip == null)
+                    {
+                        _logger.LogError($"Could not resolve host '{server.Address}'.");
+                    }
+                    else
+                    {
+                        _logger.LogInformation($"Memcached server address - {server.Address }({ip}):{server.Port}");
+                        server.Address = ip;
+                    }
+                }
+                else
+                {
+                    _logger.LogInformation($"Memcached server address - {server.Address }:{server.Port}");
+                }
+
+                Servers.Add(new DnsEndPoint(server.Address, server.Port));
+            }
+        }
+
         /// <summary>
         /// Adds a new server to the pool.
         /// </summary>