Check configuration from appsettings.json

Author: cnblogs-dudu

Enyim.Caching/Configuration/MemcachedClientConfiguration.cs

@@ -41,13 +41,22 @@ public MemcachedClientConfiguration(
             var options = optionsAccessor.Value;
             if ((options == null || options.Servers.Count == 0) && configuration != null)
             {
-                configuration.GetSection("enyimMemcached").Bind(options);
+                var section = configuration.GetSection("enyimMemcached");                
+                if (section.Exists())
+                {
+                    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));
+                Servers.Add(new DnsEndPoint(server.Address, server.Port));
             }
 
             SocketPool = new SocketPoolConfiguration();

Enyim.Caching/Configuration/MemcachedClientOptions.cs

@@ -30,6 +30,8 @@ public void AddServer(string address, int port)
             Servers.Add(new Server { Address = address, Port = port });
         }
 
+        public void AddDefaultServer() => AddServer("memcached", 11211);    
+
         public void AddPlainTextAuthenticator(string zone, string userName, string password)
         {
             Authentication = new Authentication

Enyim.Caching/EnyimMemcachedServiceCollectionExtensions.cs

@@ -49,6 +49,11 @@ public static IServiceCollection AddEnyimMemcached(this IServiceCollection servi
                 throw new ArgumentNullException(nameof(configurationSection));
             }
 
+            if(!configurationSection.Exists())
+            {
+                throw new ArgumentNullException($"{configurationSection.Key} in appsettings.json");
+            }
+
             return AddEnyimMemcachedInternal(services, s => s.Configure<MemcachedClientOptions>(configurationSection));
         }
 
@@ -64,7 +69,13 @@ public static IServiceCollection AddEnyimMemcached(this IServiceCollection servi
                 throw new ArgumentNullException(nameof(configuration));
             }
 
-            return AddEnyimMemcachedInternal(services, s => s.Configure<MemcachedClientOptions>(configuration.GetSection(sectionKey)));
+            var section = configuration.GetSection(sectionKey);
+            if (!section.Exists())
+            {
+                throw new ArgumentNullException($"{sectionKey} in appsettings.json");
+            }
+
+            return AddEnyimMemcachedInternal(services, s => s.Configure<MemcachedClientOptions>(section));
         }
 
         private static IServiceCollection AddEnyimMemcachedInternal(IServiceCollection services, Action<IServiceCollection> configure)
@@ -81,6 +92,6 @@ private static IServiceCollection AddEnyimMemcachedInternal(IServiceCollection s
             services.AddSingleton<IDistributedCache>(factory => factory.GetService<MemcachedClient>());
 
             return services;
-        }
+        }        
     }
 }