Add options validation and better messages when mis-configured.

Author: Coleman, Christopher

src/ColeSoft.Extensions.Logging.Splunk/ColeSoft.Extensions.Logging.Splunk.csproj

@@ -23,7 +23,8 @@
     </PackageReference>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="2.2.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="2.2.0" />    
+    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="2.2.0" />
+    <PackageReference Include="Microsoft.Extensions.Options.DataAnnotations" Version="2.2.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.1" />    
     <PackageReference Include="SonarAnalyzer.CSharp" Version="7.11.0.8083">
       <PrivateAssets>all</PrivateAssets>

src/ColeSoft.Extensions.Logging.Splunk/SplunkLoggerFactoryExtensions.cs

@@ -150,7 +150,8 @@ private static ILoggingBuilder AddSplunkJson(this ILoggingBuilder builder, Func<
                         : new SplunkJsonPayloadTransformer(payloadCreator));
 
             builder.Services.AddSingleton<ILoggerProvider, SplunkJsonLoggerProvider>();
-            builder.Services.AddSingleton<IConfigureOptions<SplunkLoggerOptions>, LoggerProviderConfigureOptions<SplunkLoggerOptions, SplunkJsonLoggerProvider>>();
+            builder.Services.AddOptions<SplunkLoggerOptions>().ValidateDataAnnotations();
+            builder.Services.AddSingleton<IConfigureOptions<SplunkLoggerOptions>, LoggerProviderConfigureOptions<SplunkLoggerOptions, SplunkJsonLoggerProvider>>();            
             builder.Services.AddSingleton<IOptionsChangeTokenSource<SplunkLoggerOptions>, LoggerProviderOptionsChangeTokenSource<SplunkLoggerOptions, SplunkJsonLoggerProvider>>();
 
             return builder;
@@ -180,6 +181,7 @@ private static ILoggingBuilder AddSplunkRaw(this ILoggingBuilder builder, Func<L
                         : new SplunkRawPayloadTransformer(payloadCreator));
 
             builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<ILoggerProvider, SplunkRawLoggerProvider>());
+            builder.Services.AddOptions<SplunkLoggerOptions>().ValidateDataAnnotations();
             builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<SplunkLoggerOptions>, LoggerProviderConfigureOptions<SplunkLoggerOptions, SplunkRawLoggerProvider>>());
             builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IOptionsChangeTokenSource<SplunkLoggerOptions>, LoggerProviderOptionsChangeTokenSource<SplunkLoggerOptions, SplunkRawLoggerProvider>>());
 

src/ColeSoft.Extensions.Logging.Splunk/SplunkLoggerOptions.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
 
 namespace ColeSoft.Extensions.Logging.Splunk
 {
@@ -53,12 +54,14 @@ public enum ChannelIdOption
         /// <remarks>This must be specified.</remarks>
         /// <example>https://http-inputs-&lt;customer&gt;.splunkcloud.com/services/collector.</example>
         /// <example>https://my-server:8088/services/collector.</example>
+        [Required]
         public string SplunkCollectorUrl { get; set; }
 
         /// <summary>
         /// Gets or sets the HEC authentication token.
         /// </summary>
         /// <remarks>This must be specified.  See <see href="http://dev.splunk.com/view/event-collector/SP-CAAAE6P#auth"/> for more information.</remarks>
+        [Required]
         public string AuthenticationToken { get; set; }
 
         /// <summary>