Changed ExceptionlessAspNetCorePlugin to allow for retrieving HttpContext via IHttpContextAccessor. (#205)

Made ExceptionlessAspNetCorePlugin, ExceptionlessDiagnosticListener, and RequestInfoCollector public classes.

Author: moogle001

src/Platforms/Exceptionless.AspNetCore/ExceptionlessAspNetCorePlugin.cs

@@ -8,9 +8,23 @@
 
 namespace Exceptionless.AspNetCore {
     [Priority(90)]
-    internal class ExceptionlessAspNetCorePlugin : IEventPlugin {
+    public class ExceptionlessAspNetCorePlugin : IEventPlugin {
+        IHttpContextAccessor _httpContextAccessor;
+
+        public ExceptionlessAspNetCorePlugin()
+            : this(null) {
+
+        }
+
+        public ExceptionlessAspNetCorePlugin(IHttpContextAccessor httpContextAccessor) {
+            _httpContextAccessor = httpContextAccessor;
+        }
+
         public void Run(EventPluginContext context) {
             var httpContext = context.ContextData.GetHttpContext();
+            if (httpContext == null && _httpContextAccessor != null)
+                httpContext = _httpContextAccessor.HttpContext;
+
             var serializer = context.Client.Configuration.Resolver.GetJsonSerializer();
             if (context.Client.Configuration.IncludeUserName)
                 AddUser(context, httpContext, serializer);
@@ -24,7 +38,8 @@ public void Run(EventPluginContext context) {
 
             try {
                 ri = httpContext.GetRequestInfo(context.Client.Configuration);
-            } catch (Exception ex) {
+            }
+            catch (Exception ex) {
                 context.Log.Error(typeof(ExceptionlessAspNetCorePlugin), ex, "Error adding request info.");
             }
 

src/Platforms/Exceptionless.AspNetCore/ExceptionlessDiagnosticListener.cs

@@ -4,7 +4,7 @@
 using Microsoft.Extensions.DiagnosticAdapter;
 
 namespace Exceptionless.AspNetCore {
-    internal sealed class ExceptionlessDiagnosticListener {
+    public sealed class ExceptionlessDiagnosticListener {
         private readonly ExceptionlessClient _client;
 
         public ExceptionlessDiagnosticListener(ExceptionlessClient client) {

src/Platforms/Exceptionless.AspNetCore/ExceptionlessExtensions.cs

@@ -18,8 +18,12 @@ public static IApplicationBuilder UseExceptionless(this IApplicationBuilder app,
             if (client == null)
                 client = ExceptionlessClient.Default;
 
+            // Can be registered in Startup.ConfigureServices via services.AddHttpContextAccessor();
+            // this is necessary to obtain Session and Request information outside of ExceptionlessMiddleware
+            var contextAccessor = app.ApplicationServices.GetService<IHttpContextAccessor>();
+
             client.Startup();
-            client.Configuration.AddPlugin<ExceptionlessAspNetCorePlugin>();
+            client.Configuration.AddPlugin(new ExceptionlessAspNetCorePlugin(contextAccessor));
             client.Configuration.AddPlugin<IgnoreUserAgentPlugin>();
             //client.Configuration.Resolver.Register<ILastReferenceIdManager, WebLastReferenceIdManager>();
 

src/Platforms/Exceptionless.AspNetCore/RequestInfoCollector.cs

@@ -12,7 +12,7 @@
 using System.Text;
 
 namespace Exceptionless.AspNetCore {
-    internal static class RequestInfoCollector {
+    public static class RequestInfoCollector {
         private const int MAX_BODY_SIZE = 50 * 1024;
         public static RequestInfo Collect(HttpContext context, ExceptionlessConfiguration config) {
             if (context == null)