Intercepting SignalR Hubs with Autofac

CallLogger.cs

using System;
using System.Diagnostics;
using System.Linq;
using Castle.DynamicProxy;

namespace SignalInterceptor
{
	public class CallLogger : IInterceptor
	{
		public void Intercept(IInvocation invocation)
		{
			Trace.WriteLine(
				String.Format("Calling method {0} with parameters {1}... ",
				invocation.Method.Name,
				String.Join(", ", invocation.Arguments.Select(a => (a ?? "").ToString()).ToArray())));

			invocation.Proceed();

			Trace.WriteLine(String.Format("Done: result was {0}.", invocation.ReturnValue));
		}
	}
}

ChatHub.cs

using Microsoft.AspNet.SignalR;

namespace SignalInterceptor.Hubs
{
	public class ChatHub : Hub
	{
		// IMPORTANT: The method must be virtual or it won't get intercepted!
		public virtual void Send(string name, string message)
		{
			Clients.All.addNewMessageToPage(name, message);
		}
	}
}

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Antlr" version="3.5.0.2" targetFramework="net45" />


  <!-- Don't forget the SignalR AND the DynamicProxy2 integration packages for Autofac -->
  <package id="Autofac" version="3.5.2" targetFramework="net45" />
  <package id="Autofac.Extras.DynamicProxy2" version="3.0.5" targetFramework="net45" />
  <package id="Autofac.Mvc5" version="3.3.4" targetFramework="net45" />
  <package id="Autofac.Mvc5.Owin" version="3.1.0" targetFramework="net45" />
  <package id="Autofac.Owin" version="3.1.0" targetFramework="net45" />
  <package id="Autofac.SignalR2" version="3.1.0" targetFramework="net45" />


  <package id="bootstrap" version="3.3.4" targetFramework="net45" />
  <package id="Castle.Core" version="3.3.3" targetFramework="net45" />
  <package id="jQuery" version="2.1.4" targetFramework="net45" />
  <package id="jQuery.Validation" version="1.13.1" targetFramework="net45" />
  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.Core" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.JS" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.SystemWeb" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" />
  <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.3" targetFramework="net45" />
  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
  <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net45" />
  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
  <package id="Modernizr" version="2.8.3" targetFramework="net45" />
  <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net45" />
  <package id="Owin" version="1.0" targetFramework="net45" />
  <package id="Respond" version="1.4.2" targetFramework="net45" />
  <package id="WebGrease" version="1.6.0" targetFramework="net45" />
</packages>

Startup.cs

using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
using Autofac;
using Autofac.Extras.DynamicProxy2;
using Autofac.Integration.Mvc;
using Autofac.Integration.SignalR;
using Microsoft.AspNet.SignalR;
using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(SignalInterceptor.Startup))]

namespace SignalInterceptor
{
	public class Startup
	{
		public void Configuration(IAppBuilder app)
		{
			// Autofac registrations
			var builder = new ContainerBuilder();
			builder.RegisterType<CallLogger>();
			builder.RegisterHubs(typeof(Startup).Assembly).EnableClassInterceptors().InterceptedBy(typeof(CallLogger));
			builder.RegisterControllers(typeof(Startup).Assembly);
			var container = builder.Build();

			// MVC setup
			AreaRegistration.RegisterAllAreas();
			FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
			RouteConfig.RegisterRoutes(RouteTable.Routes);
			BundleConfig.RegisterBundles(BundleTable.Bundles);
			DependencyResolver.SetResolver(new Autofac.Integration.Mvc.AutofacDependencyResolver(container));

			// SignalR setup
			var config = new HubConfiguration();
			config.Resolver = new Autofac.Integration.SignalR.AutofacDependencyResolver(container);

			// OWIN middleware
			app.UseAutofacMiddleware(container);
			app.UseAutofacMvc();
			app.MapSignalR("/signalr", config);
		}
	}
}