hacked together load balancing reroutes in fileconfig (#211)

* hacked together load balancing reroutes in fileconfig

* some renaming and refactoring

* more renames

* hacked away the old config json

* test for issue 213

* renamed key

* dont share ports

* oops

* updated docs

* mvoed docs around

* port being used

test/Ocelot.AcceptanceTests/LoadBalancerTests.cs

@@ -0,0 +1,178 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using Consul;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Ocelot.Configuration.File;
+using Shouldly;
+using TestStack.BDDfy;
+using Xunit;
+
+namespace Ocelot.AcceptanceTests
+{
+    public class LoadBalancerTests : IDisposable
+    {
+        private IWebHost _builderOne;
+        private IWebHost _builderTwo;
+        private readonly Steps _steps;
+        private int _counterOne;
+        private int _counterTwo;
+        private static readonly object _syncLock = new object();
+
+        public LoadBalancerTests()
+        {
+            _steps = new Steps();
+        }
+
+        [Fact]
+        public void should_use_service_discovery_and_load_balance_request()
+        {
+            var downstreamServiceOneUrl = "http://localhost:50881";
+            var downstreamServiceTwoUrl = "http://localhost:50882";
+
+            var configuration = new FileConfiguration
+            {
+                ReRoutes = new List<FileReRoute>
+                    {
+                        new FileReRoute
+                        {
+                            DownstreamPathTemplate = "/",
+                            DownstreamScheme = "http",
+                            UpstreamPathTemplate = "/",
+                            UpstreamHttpMethod = new List<string> { "Get" },
+                            LoadBalancer = "LeastConnection",
+                            DownstreamHostAndPorts = new List<FileHostAndPort>
+                            {
+                                new FileHostAndPort
+                                {
+                                    Host = "localhost",
+                                    Port = 50881
+                                },
+                                new FileHostAndPort
+                                {
+                                    Host = "localhost",
+                                    Port = 50882
+                                }
+                            }
+                        }
+                    },
+                    GlobalConfiguration = new FileGlobalConfiguration()
+                    {
+                    }
+            };
+
+            this.Given(x => x.GivenProductServiceOneIsRunning(downstreamServiceOneUrl, 200))
+                .And(x => x.GivenProductServiceTwoIsRunning(downstreamServiceTwoUrl, 200))
+                .And(x => _steps.GivenThereIsAConfiguration(configuration))
+                .And(x => _steps.GivenOcelotIsRunning())
+                .When(x => _steps.WhenIGetUrlOnTheApiGatewayMultipleTimes("/", 50))
+                .Then(x => x.ThenTheTwoServicesShouldHaveBeenCalledTimes(50))
+                .And(x => x.ThenBothServicesCalledRealisticAmountOfTimes(24, 26))
+                .BDDfy();
+        }
+
+        private void ThenOnlyOneServiceHasBeenCalled()
+        {
+            _counterOne.ShouldBe(10);
+            _counterTwo.ShouldBe(0);
+        }
+
+         private void GivenIResetCounters()
+        {
+            _counterOne = 0;
+            _counterTwo = 0;
+        }
+
+        private void ThenBothServicesCalledRealisticAmountOfTimes(int bottom, int top)
+        {
+            _counterOne.ShouldBeInRange(bottom, top);
+            _counterOne.ShouldBeInRange(bottom, top);
+        }
+
+        private void ThenTheTwoServicesShouldHaveBeenCalledTimes(int expected)
+        {
+            var total = _counterOne + _counterTwo;
+            total.ShouldBe(expected);
+        }
+
+        private void GivenProductServiceOneIsRunning(string url, int statusCode)
+        {
+            _builderOne = new WebHostBuilder()
+                .UseUrls(url)
+                .UseKestrel()
+                .UseContentRoot(Directory.GetCurrentDirectory())
+                .UseIISIntegration()
+                .UseUrls(url)
+                .Configure(app =>
+                {
+                    app.Run(async context =>
+                    {
+                        try
+                        {
+                            var response = string.Empty;
+                            lock (_syncLock)
+                            {
+                                _counterOne++;
+                                response = _counterOne.ToString();
+                            }
+                            context.Response.StatusCode = statusCode;
+                            await context.Response.WriteAsync(response);
+                        }
+                        catch (System.Exception exception)
+                        {
+                            await context.Response.WriteAsync(exception.StackTrace);
+                        }
+                    });
+                })
+                .Build();
+
+            _builderOne.Start();
+        }
+
+        private void GivenProductServiceTwoIsRunning(string url, int statusCode)
+        {
+            _builderTwo = new WebHostBuilder()
+                .UseUrls(url)
+                .UseKestrel()
+                .UseContentRoot(Directory.GetCurrentDirectory())
+                .UseIISIntegration()
+                .UseUrls(url)
+                .Configure(app =>
+                {
+                    app.Run(async context =>
+                    {
+                        try
+                        {
+                            var response = string.Empty;
+                            lock (_syncLock)
+                            {
+                                _counterTwo++;
+                                response = _counterTwo.ToString();
+                            }
+                            
+                            context.Response.StatusCode = statusCode;
+                            await context.Response.WriteAsync(response);
+                        }
+                        catch (System.Exception exception)
+                        {
+                            await context.Response.WriteAsync(exception.StackTrace);
+                        }
+                   
+                    });
+                })
+                .Build();
+
+            _builderTwo.Start();
+        }
+
+        public void Dispose()
+        {
+            _builderOne?.Dispose();
+            _builderTwo?.Dispose();
+            _steps.Dispose();
+        }
+    }
+}