owin dynamic routing idea

DynamicRouting.cs

// WARNING this gist is an example with potentially non-compilable code!

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace Owin.Routing
{
	using AppFunc = Func<IDictionary<string, object>, Task>;

	static class DynamicRouter
	{
		/// <summary>
		/// Selects OWIN pipeline at runtime.
		/// </summary>
		/// <param name="app">holds initial owin pipeline state</param>
		/// <param name="selector">function to build new owin pipeline</param>
		/// <param name="routesChanged">signal to rebuild pipeline</param>
		/// <returns></returns>
		public static IAppBuilder UseDynamicRouting(this IAppBuilder app,
			Func<IAppBuilder, IAppBuilder> selector,
			IObservable<bool> routesChanged)
		{
			var api = selector(app);
			var handler = (AppFunc) api.Build(typeof(AppFunc));

			routesChanged.Subscribe(_ =>
			{
				api = selector(app);
				handler = (AppFunc) api.Build(typeof(AppFunc));
			});

			return app.Use((ctx, next) => handler(ctx.Environment));
		}
	}
}

Is the AppFunc the provider of the new routing?

BTW this solution should be easily implemented/ported to Web API, ASP.NET vNext. So no need to use Owin.Routing package at all.

AppFunc is alias of function which as part of OWIN standard, this function abstracts entire app from server implementation. See also MapMiddlware where IAppBuilder.Build is used.

P.S. it seems I did not understand the question, but try to give you some information.

Sorry ... I am having a hard time understanding how to implement this ...