Feature/expose http handlers (#224)

* temp commit

* trying to work out how to expose the http handlers in a decent way..

* pissing about at lunch

* changed to func so you can instanciate object or new it up each time

* docs for dele handlers

* upgraded to sdk 2.1.4

* some validation for consul services

test/Ocelot.UnitTests/Requester/DelegatingHandlerHandlerProviderFactoryTests.cs

@@ -0,0 +1,124 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using Moq;
+using Ocelot.Logging;
+using Ocelot.Requester;
+using Shouldly;
+using TestStack.BDDfy;
+using Xunit;
+
+namespace Ocelot.UnitTests.Requester
+{
+    public class DelegatingHandlerHandlerProviderFactoryTests
+    {
+        private readonly DelegatingHandlerHandlerProviderFactory _factory;
+        private Mock<IOcelotLoggerFactory> _loggerFactory;
+        private Ocelot.Request.Request _request;
+        private IDelegatingHandlerHandlerProvider _provider;
+        private readonly Mock<IDelegatingHandlerHandlerProvider> _allRoutesProvider;
+
+        public DelegatingHandlerHandlerProviderFactoryTests()
+        {
+            _allRoutesProvider = new Mock<IDelegatingHandlerHandlerProvider>();
+            _loggerFactory = new Mock<IOcelotLoggerFactory>();
+            _factory = new DelegatingHandlerHandlerProviderFactory(_loggerFactory.Object, _allRoutesProvider.Object, null);
+        }
+
+        [Fact]
+        public void should_all_from_all_routes_provider_and_qos()
+        {
+            var handlers = new List<Func<DelegatingHandler>>
+            {
+                () => new FakeDelegatingHandler(0),
+                () => new FakeDelegatingHandler(1)
+            };
+
+            var request = new Ocelot.Request.Request(new HttpRequestMessage(), true, null, true, true, "", false);
+
+            this.Given(x => GivenTheFollowingRequest(request))
+                .And(x => GivenTheAllRoutesProviderReturns(handlers))
+                .When(x => WhenIGet())
+                .Then(x => ThenThereIsDelegatesInProvider(3))
+                .And(x => ThenTheDelegatesAreAddedCorrectly())
+                .And(x => ThenItIsPolly(2))
+                .BDDfy();
+        }
+
+        [Fact]
+        public void should_return_provider_with_no_delegates()
+        {
+            var request = new Ocelot.Request.Request(new HttpRequestMessage(), false, null, true, true, "", false);
+
+            this.Given(x => GivenTheFollowingRequest(request))
+                .And(x => GivenTheAllRoutesProviderReturns())
+                .When(x => WhenIGet())
+                .Then(x => ThenNoDelegatesAreInTheProvider())
+                .BDDfy();
+        }
+
+        [Fact]
+        public void should_return_provider_with_qos_delegate()
+        {
+            var request = new Ocelot.Request.Request(new HttpRequestMessage(), true, null, true, true, "", false);
+
+            this.Given(x => GivenTheFollowingRequest(request))
+                .And(x => GivenTheAllRoutesProviderReturns())
+                .When(x => WhenIGet())
+                .Then(x => ThenThereIsDelegatesInProvider(1))
+                .And(x => ThenItIsPolly(0))
+                .BDDfy();
+        }
+
+        private void ThenTheDelegatesAreAddedCorrectly()
+        {
+            var delegates = _provider.Get();
+            var del = delegates[0].Invoke();
+            var handler = (FakeDelegatingHandler) del;
+            handler.Order.ShouldBe(0);
+
+            del = delegates[1].Invoke();
+            handler = (FakeDelegatingHandler)del;
+            handler.Order.ShouldBe(1);
+        }
+
+        private void GivenTheAllRoutesProviderReturns()
+        {
+            _allRoutesProvider.Setup(x => x.Get()).Returns(new List<Func<DelegatingHandler>>());
+        }
+
+        private void GivenTheAllRoutesProviderReturns(List<Func<DelegatingHandler>> handlers)
+        {
+            _allRoutesProvider.Setup(x => x.Get()).Returns(handlers);
+        }
+
+        private void ThenItIsPolly(int i)
+        {
+            var delegates = _provider.Get();
+            var del = delegates[i].Invoke();
+            del.ShouldBeOfType<PollyCircuitBreakingDelegatingHandler>();
+        }
+
+        private void ThenThereIsDelegatesInProvider(int count)
+        {
+            _provider.ShouldNotBeNull();
+            _provider.Get().Count.ShouldBe(count);
+        }
+
+        private void GivenTheFollowingRequest(Ocelot.Request.Request request)
+        {
+            _request = request;
+        }
+
+        private void WhenIGet()
+        {
+            _provider = _factory.Get(_request);
+        }
+
+        private void ThenNoDelegatesAreInTheProvider()
+        {
+            _provider.ShouldNotBeNull();
+            _provider.Get().Count.ShouldBe(0);
+        }
+    }
+}