broke out butterfly into seperate project (#521)

* broke out butterfly into seperate project

* nearly did it...

* updated docs as I have broken the butterfly code off into a seperate dll

docs/features/tracing.rst

@@ -1,19 +1,29 @@
 Tracing
 =======
 
-Ocelot providers tracing functionality from the excellent `Butterfly <https://github.com/liuhaoyang/butterfly>`_ project. 
+This page details how to perform distributed tracing with Ocelot. At the moment we only support Butterfly but other tracers might just work without
+anything Ocelot specific.
+
+Butterfly
+^^^^^^^^^
+
+Ocelot providers tracing functionality from the excellent `Butterfly <https://github.com/liuhaoyang/butterfly>`_ project. The code for the Ocelot integration
+can be found `here <https://github.com/ThreeMammals/Ocelot.Tracing.Butterfly>`_.
 
 In order to use the tracing please read the Butterfly documentation.
 
 In ocelot you need to do the following if you wish to trace a ReRoute.
 
+   ``Install-Package Ocelot.Tracing.Butterfly``
+
 In your ConfigureServices method
 
 .. code-block:: csharp
 
     services
         .AddOcelot()
-        .AddOpenTracing(option =>
+        // this comes from Ocelot.Tracing.Butterfly package
+        .AddButterfly(option =>
         {
             //this is the url that the butterfly collector server is running on...
             option.CollectorUrl = "http://localhost:9618";

src/Ocelot/Configuration/Creator/HttpHandlerOptionsCreator.cs

@@ -1,18 +1,17 @@
 namespace Ocelot.Configuration.Creator
 {
     using System;
-    using Butterfly.Client.Tracing;
+    using Logging;
     using Microsoft.Extensions.DependencyInjection;
     using Ocelot.Configuration.File;
-    using Ocelot.Requester;
 
     public class HttpHandlerOptionsCreator : IHttpHandlerOptionsCreator
     {
-        private readonly IServiceTracer _tracer;
+        private readonly ITracer _tracer;
 
         public HttpHandlerOptionsCreator(IServiceProvider services)
         {
-            _tracer = services.GetService<IServiceTracer>();
+            _tracer = services.GetService<ITracer>();
         }
 
         public HttpHandlerOptions Create(FileHttpHandlerOptions options)

src/Ocelot/DependencyInjection/IOcelotBuilder.cs

@@ -1,4 +1,3 @@
-using Butterfly.Client.AspNetCore;
 using CacheManager.Core;
 using System;
 using System.Net.Http;
@@ -17,8 +16,6 @@ namespace Ocelot.DependencyInjection
 
         IOcelotBuilder AddCacheManager(Action<ConfigurationBuilderCachePart> settings);
 
-        IOcelotBuilder AddOpenTracing(Action<ButterflyOptions> settings);
-
         IOcelotAdministrationBuilder AddAdministration(string path, string secret);
 
         IOcelotAdministrationBuilder AddAdministration(string path, Action<IdentityServerAuthenticationOptions> configOptions);

src/Ocelot/DependencyInjection/OcelotBuilder.cs

@@ -40,10 +40,8 @@ namespace Ocelot.DependencyInjection
     using Ocelot.Configuration;
     using Microsoft.Extensions.DependencyInjection.Extensions;
     using System.Net.Http;
-    using Butterfly.Client.AspNetCore;
     using Ocelot.Infrastructure;
     using Ocelot.Infrastructure.Consul;
-    using Butterfly.Client.Tracing;
     using Ocelot.Middleware.Multiplexer;
     using ServiceDiscovery.Providers;
     using Steeltoe.Common.Discovery;
@@ -228,12 +226,6 @@ namespace Ocelot.DependencyInjection
             return this;
         }
 
-        public IOcelotBuilder AddOpenTracing(Action<ButterflyOptions> settings)
-        {
-            _services.AddButterfly(settings);   
-            return this;
-        }
-
         public IOcelotBuilder AddStoreOcelotConfigurationInConsul()
         {
             _services.AddHostedService<FileConfigurationPoller>();

src/Ocelot/Logging/OcelotDiagnosticListener.cs

@@ -2,26 +2,20 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DiagnosticAdapter;
 using Microsoft.Extensions.DependencyInjection;
-using Butterfly.Client.AspNetCore;
-using Butterfly.OpenTracing;
 using Ocelot.Middleware;
-using Butterfly.Client.Tracing;
-using System.Linq;
-using System.Collections.Generic;
-using Ocelot.Infrastructure.Extensions;
-using Ocelot.Requester;
 
 namespace Ocelot.Logging
 {
     public class OcelotDiagnosticListener
     {
-        private readonly IServiceTracer _tracer;
         private readonly IOcelotLogger _logger;
+        private readonly ITracer _tracer;
 
-        public OcelotDiagnosticListener(IOcelotLoggerFactory factory, IServiceProvider services)
+        public OcelotDiagnosticListener(IOcelotLoggerFactory factory, IServiceProvider serviceProvider)
         {
-            _tracer = services.GetService<IServiceTracer>();
             _logger = factory.CreateLogger<OcelotDiagnosticListener>();
+            _tracer = serviceProvider.GetService<ITracer>();
+
         }
 
         [DiagnosticName("Ocelot.MiddlewareException")]
@@ -67,29 +61,7 @@ namespace Ocelot.Logging
 
         private void Event(HttpContext httpContext, string @event)
         {  
-            // todo - if the user isnt using tracing the code gets here and will blow up on 
+            _tracer?.Event(httpContext, @event);
-            // _tracer.Tracer.TryExtract..
-            if(_tracer == null)
-            {
-                return;
-            }
-
-            var span = httpContext.GetSpan();
-
-            if(span == null)
-            {
-                var spanBuilder = new SpanBuilder($"server {httpContext.Request.Method} {httpContext.Request.Path}");
-                if (_tracer.Tracer.TryExtract(out var spanContext, httpContext.Request.Headers, (c, k) => c[k].GetValue(),
-                    c => c.Select(x => new KeyValuePair<string, string>(x.Key, x.Value.GetValue())).GetEnumerator()))
-                {
-                    spanBuilder.AsChildOf(spanContext);
-                }
-
-                span = _tracer.Start(spanBuilder);        
-                httpContext.SetSpan(span);   
-            }
-
-            span?.Log(LogField.CreateNew().Event(@event));
         }
     }
 }

src/Ocelot/Ocelot.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <RuntimeFrameworkVersion>2.0.0</RuntimeFrameworkVersion>
@@ -25,10 +25,6 @@
     <DebugSymbols>True</DebugSymbols>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Butterfly.Client" Version="0.0.8" />
-    <PackageReference Include="Butterfly.Client.AspNetCore" Version="0.0.8">
-      <NoWarn>NU1701</NoWarn>
-    </PackageReference>
     <PackageReference Include="FluentValidation" Version="7.6.104" />
     <PackageReference Include="IdentityServer4.AccessTokenValidation" Version="2.6.0" />
     <PackageReference Include="Microsoft.AspNetCore" Version="2.1.1" />

src/Ocelot/Requester/DelegatingHandlerHandlerFactory.cs

@@ -2,7 +2,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Net.Http;
-using Butterfly.Client.Tracing;
 using Microsoft.Extensions.DependencyInjection;
 using Ocelot.Configuration;
 using Ocelot.Logging;

src/Ocelot/Requester/OcelotHttpTracingHandler.cs

@@ -1,21 +1,19 @@
-using System;
+namespace Ocelot.Requester
+{
+    using Logging;
+    using System;
     using System.Net.Http;
     using System.Threading;
     using System.Threading.Tasks;
-using Butterfly.Client.Tracing;
-using Butterfly.OpenTracing;
     using Ocelot.Infrastructure.RequestData;
 
-namespace Ocelot.Requester
-{
     public class OcelotHttpTracingHandler : DelegatingHandler, ITracingHandler
     {
-        private readonly IServiceTracer _tracer;
+        private readonly ITracer _tracer;
         private readonly IRequestScopedDataRepository _repo;
-        private const string PrefixSpanId = "ot-spanId";
 
         public OcelotHttpTracingHandler(
-            IServiceTracer tracer, 
+            ITracer tracer, 
             IRequestScopedDataRepository repo,
             HttpMessageHandler httpMessageHandler = null)
         {
@@ -28,46 +26,8 @@ namespace Ocelot.Requester
             HttpRequestMessage request, 
             CancellationToken cancellationToken)
         {
-            return _tracer.ChildTraceAsync($"httpclient {request.Method}", DateTimeOffset.UtcNow, span => TracingSendAsync(span, request, cancellationToken));
-        }
             
-        protected virtual async Task<HttpResponseMessage> TracingSendAsync(
+            return _tracer.SendAsync(request, cancellationToken, x => _repo.Add("TraceId", x), (r,c) => base.SendAsync(r, c));
-            ISpan span, 
-            HttpRequestMessage request, 
-            CancellationToken cancellationToken)
-        {
-            if (request.Headers.Contains(PrefixSpanId))
-            {
-                request.Headers.Remove(PrefixSpanId);
-                request.Headers.TryAddWithoutValidation(PrefixSpanId, span.SpanContext.SpanId);
-            }
-
-            _repo.Add("TraceId", span.SpanContext.TraceId);
-            
-            span.Tags.Client().Component("HttpClient")
-                .HttpMethod(request.Method.Method)
-                .HttpUrl(request.RequestUri.OriginalString)
-                .HttpHost(request.RequestUri.Host)
-                .HttpPath(request.RequestUri.PathAndQuery)
-                .PeerAddress(request.RequestUri.OriginalString)
-                .PeerHostName(request.RequestUri.Host)
-                .PeerPort(request.RequestUri.Port);
-
-            _tracer.Tracer.Inject(span.SpanContext, request.Headers, (c, k, v) =>
-            {
-                if (!c.Contains(k))
-                {
-                    c.Add(k, v);
-                }
-            });
-
-            span.Log(LogField.CreateNew().ClientSend());
-
-            var responseMessage = await base.SendAsync(request, cancellationToken);
-
-            span.Log(LogField.CreateNew().ClientReceive());
-
-            return responseMessage;
         }
     }
 }

src/Ocelot/Requester/TracingHandlerFactory.cs

@@ -1,13 +1,13 @@
 namespace Ocelot.Requester
 {
     using System;
-    using Butterfly.Client.Tracing;
+    using Logging;
     using Ocelot.Infrastructure.RequestData;
     using Microsoft.Extensions.DependencyInjection;
 
     public class TracingHandlerFactory : ITracingHandlerFactory
     {
-        private readonly IServiceTracer _tracer;
+        private readonly ITracer _tracer;
         private readonly IRequestScopedDataRepository _repo;
 
         public TracingHandlerFactory(
@@ -15,7 +15,7 @@ namespace Ocelot.Requester
             IRequestScopedDataRepository repo)
         {
             _repo = repo;
-            _tracer = services.GetService<IServiceTracer>();
+            _tracer = services.GetService<ITracer>();
         }
 
         public ITracingHandler Get()

test/Ocelot.AcceptanceTests/ButterflyTracingTests.cs

@@ -1,284 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Net;
-using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Hosting;
-using Microsoft.AspNetCore.Http;
-using Ocelot.Configuration.File;
-using Shouldly;
-using TestStack.BDDfy;
-using Xunit;
-using Butterfly.Client.AspNetCore;
-using static Rafty.Infrastructure.Wait;
-
-namespace Ocelot.AcceptanceTests
-{
-    using Xunit.Abstractions;
-
-    public class ButterflyTracingTests : IDisposable
-    {
-        private IWebHost _serviceOneBuilder;
-        private IWebHost _serviceTwoBuilder;
-        private IWebHost _fakeButterfly;
-        private readonly Steps _steps;
-        private string _downstreamPathOne;
-        private string _downstreamPathTwo;
-        private int _butterflyCalled;
-        private readonly ITestOutputHelper _output;
-
-        public ButterflyTracingTests(ITestOutputHelper output)
-        {
-            _output = output;
-            _steps = new Steps();
-        }
-
-        [Fact]
-        public void should_forward_tracing_information_from_ocelot_and_downstream_services()
-        {
-            var configuration = new FileConfiguration
-            {
-                ReRoutes = new List<FileReRoute>
-                    {
-                        new FileReRoute
-                        {
-                            DownstreamPathTemplate = "/api/values",
-                            DownstreamScheme = "http",
-                            DownstreamHostAndPorts = new List<FileHostAndPort>
-                            {
-                                new FileHostAndPort
-                                {
-                                    Host = "localhost",
-                                    Port = 51887,
-                                }
-                            },
-                            UpstreamPathTemplate = "/api001/values",
-                            UpstreamHttpMethod = new List<string> { "Get" },
-                            HttpHandlerOptions = new FileHttpHandlerOptions
-                            {
-                                UseTracing = true
-                            },
-                            QoSOptions = new FileQoSOptions
-                            {
-                                ExceptionsAllowedBeforeBreaking = 3,
-                                DurationOfBreak = 10,
-                                TimeoutValue = 5000
-                            }
-                        },
-                        new FileReRoute
-                        {
-                            DownstreamPathTemplate = "/api/values",
-                            DownstreamScheme = "http",
-                            DownstreamHostAndPorts = new List<FileHostAndPort>
-                            {
-                                new FileHostAndPort
-                                {
-                                    Host = "localhost",
-                                    Port = 51388,
-                                }
-                            },
-                            UpstreamPathTemplate = "/api002/values",
-                            UpstreamHttpMethod = new List<string> { "Get" },
-                            HttpHandlerOptions = new FileHttpHandlerOptions
-                            {
-                                UseTracing = true
-                            },
-                            QoSOptions = new FileQoSOptions
-                            {
-                                ExceptionsAllowedBeforeBreaking = 3,
-                                DurationOfBreak = 10,
-                                TimeoutValue = 5000
-                            }
-                        }
-                    }
-            };
-
-            var butterflyUrl = "http://localhost:9618";
-
-            this.Given(x => GivenFakeButterfly(butterflyUrl))
-                .And(x => GivenServiceOneIsRunning("http://localhost:51887", "/api/values", 200, "Hello from Laura", butterflyUrl))
-                .And(x => GivenServiceTwoIsRunning("http://localhost:51388", "/api/values", 200, "Hello from Tom", butterflyUrl))
-                .And(x => _steps.GivenThereIsAConfiguration(configuration))
-                .And(x => _steps.GivenOcelotIsRunningUsingButterfly(butterflyUrl))
-                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/api001/values"))
-                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
-                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
-                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/api002/values"))
-                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
-                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Tom"))
-                .BDDfy();
-
-            var commandOnAllStateMachines = WaitFor(10000).Until(() => _butterflyCalled >= 4);
-
-            _output.WriteLine($"_butterflyCalled is {_butterflyCalled}");
-
-            commandOnAllStateMachines.ShouldBeTrue();
-        }
-
-        [Fact]
-        public void should_return_tracing_header()
-        {
-            var configuration = new FileConfiguration
-            {
-                ReRoutes = new List<FileReRoute>
-                    {
-                        new FileReRoute
-                        {
-                            DownstreamPathTemplate = "/api/values",
-                            DownstreamScheme = "http",
-                            DownstreamHostAndPorts = new List<FileHostAndPort>
-                            {
-                                new FileHostAndPort
-                                {
-                                    Host = "localhost",
-                                    Port = 51387,
-                                }
-                            },
-                            UpstreamPathTemplate = "/api001/values",
-                            UpstreamHttpMethod = new List<string> { "Get" },
-                            HttpHandlerOptions = new FileHttpHandlerOptions
-                            {
-                                UseTracing = true
-                            },
-                            QoSOptions = new FileQoSOptions
-                            {
-                                ExceptionsAllowedBeforeBreaking = 3,
-                                DurationOfBreak = 10,
-                                TimeoutValue = 5000
-                            },
-                            DownstreamHeaderTransform = new Dictionary<string, string>()
-                            {
-                                {"Trace-Id", "{TraceId}"},
-                                {"Tom", "Laura"}
-                            }
-                        }
-                    }
-            };
-
-            var butterflyUrl = "http://localhost:9618";
-
-            this.Given(x => GivenFakeButterfly(butterflyUrl))
-                .And(x => GivenServiceOneIsRunning("http://localhost:51387", "/api/values", 200, "Hello from Laura", butterflyUrl))
-                .And(x => _steps.GivenThereIsAConfiguration(configuration))
-                .And(x => _steps.GivenOcelotIsRunningUsingButterfly(butterflyUrl))
-                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/api001/values"))
-                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
-                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
-                .And(x => _steps.ThenTheTraceHeaderIsSet("Trace-Id"))
-                .And(x => _steps.ThenTheResponseHeaderIs("Tom", "Laura"))
-                .BDDfy();
-        }
-
-        private void GivenServiceOneIsRunning(string baseUrl, string basePath, int statusCode, string responseBody, string butterflyUrl)
-        {
-            _serviceOneBuilder = new WebHostBuilder()
-                .UseUrls(baseUrl)
-                .UseKestrel()
-                .UseContentRoot(Directory.GetCurrentDirectory())
-                .UseIISIntegration()
-                .ConfigureServices(services => {
-                    services.AddButterfly(option =>
-                    {
-                        option.CollectorUrl = butterflyUrl;
-                        option.Service = "Service One";
-                        option.IgnoredRoutesRegexPatterns = new string[0];
-                    });
-                })
-                .Configure(app =>
-                {
-                    app.UsePathBase(basePath);
-                    app.Run(async context =>
-                    {   
-                        _downstreamPathOne = !string.IsNullOrEmpty(context.Request.PathBase.Value) ? context.Request.PathBase.Value : context.Request.Path.Value;
-
-                        if(_downstreamPathOne != basePath)
-                        {
-                            context.Response.StatusCode = statusCode;
-                            await context.Response.WriteAsync("downstream path didnt match base path");
-                        }
-                        else
-                        {
-                            context.Response.StatusCode = statusCode;
-                            await context.Response.WriteAsync(responseBody);
-                        }
-                    });
-                })
-                .Build();
-
-            _serviceOneBuilder.Start();
-        }
-
-        private void GivenFakeButterfly(string baseUrl)
-        {
-            _fakeButterfly = new WebHostBuilder()
-                .UseUrls(baseUrl)
-                .UseKestrel()
-                .UseContentRoot(Directory.GetCurrentDirectory())
-                .UseIISIntegration()
-                .Configure(app =>
-                {
-                    app.Run(async context =>
-                    {
-                        _butterflyCalled++;
-                        await context.Response.WriteAsync("OK...");
-                    });
-                })
-                .Build();
-
-            _fakeButterfly.Start();
-        }
-
-        private void GivenServiceTwoIsRunning(string baseUrl, string basePath, int statusCode, string responseBody, string butterflyUrl)
-        {
-            _serviceTwoBuilder = new WebHostBuilder()
-                .UseUrls(baseUrl)
-                .UseKestrel()
-                .UseContentRoot(Directory.GetCurrentDirectory())
-                .UseIISIntegration()
-                .ConfigureServices(services => {
-                    services.AddButterfly(option =>
-                    {
-                        option.CollectorUrl = butterflyUrl;
-                        option.Service = "Service Two";
-                        option.IgnoredRoutesRegexPatterns = new string[0];
-                    });
-                })
-                .Configure(app =>
-                {
-                    app.UsePathBase(basePath);
-                    app.Run(async context =>
-                    {   
-                        _downstreamPathTwo = !string.IsNullOrEmpty(context.Request.PathBase.Value) ? context.Request.PathBase.Value : context.Request.Path.Value;
-
-                        if(_downstreamPathTwo != basePath)
-                        {
-                            context.Response.StatusCode = statusCode;
-                            await context.Response.WriteAsync("downstream path didnt match base path");
-                        }
-                        else
-                        {
-                            context.Response.StatusCode = statusCode;
-                            await context.Response.WriteAsync(responseBody);
-                        }
-                    });
-                })
-                .Build();
-
-            _serviceTwoBuilder.Start();
-        }
-
-        internal void ThenTheDownstreamUrlPathShouldBe(string expectedDownstreamPathOne, string expectedDownstreamPath)
-        {
-            _downstreamPathOne.ShouldBe(expectedDownstreamPathOne);
-            _downstreamPathTwo.ShouldBe(expectedDownstreamPath);
-        }
-
-        public void Dispose()
-        {
-            _serviceOneBuilder?.Dispose();
-            _serviceTwoBuilder?.Dispose();
-            _fakeButterfly?.Dispose();
-            _steps.Dispose();
-        }
-    }
-}

test/Ocelot.AcceptanceTests/Steps.cs

@@ -31,6 +31,7 @@ using static Ocelot.Infrastructure.Wait;
 
 namespace Ocelot.AcceptanceTests
 {
+    using Butterfly;
     using Configuration.Repository;
     using Microsoft.Net.Http.Headers;
     using MediaTypeHeaderValue = System.Net.Http.Headers.MediaTypeHeaderValue;
@@ -146,44 +147,6 @@ namespace Ocelot.AcceptanceTests
             _ocelotClient = _ocelotServer.CreateClient();
         }
 
-        internal void GivenOcelotIsRunningUsingButterfly(string butterflyUrl)
-        {
-            _webHostBuilder = new WebHostBuilder();
-
-            _webHostBuilder
-                .ConfigureAppConfiguration((hostingContext, config) =>
-                {
-                    config.SetBasePath(hostingContext.HostingEnvironment.ContentRootPath);
-                    var env = hostingContext.HostingEnvironment;
-                    config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
-                        .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: false);
-                    config.AddJsonFile("ocelot.json", optional: true, reloadOnChange: false);
-                    config.AddEnvironmentVariables();
-                })
-                .ConfigureServices(s =>
-                {
-                    s.AddOcelot()
-                    .AddOpenTracing(option =>
-                    {
-                        //this is the url that the butterfly collector server is running on...
-                        option.CollectorUrl = butterflyUrl;
-                        option.Service = "Ocelot";
-                    });
-                })
-                .Configure(app =>
-                {
-                    app.Use(async (context, next) =>
-                    {
-                        await next.Invoke();
-                    });
-                    app.UseOcelot().Wait();
-                });
-
-            _ocelotServer = new TestServer(_webHostBuilder);
-
-            _ocelotClient = _ocelotServer.CreateClient();
-        }
-
         internal void GivenIWait(int wait)
         {
             Thread.Sleep(wait);

test/Ocelot.UnitTests/Configuration/HttpHandlerOptionsCreatorTests.cs

@@ -1,6 +1,4 @@
 using System;
-using Butterfly.Client.Tracing;
-using Butterfly.OpenTracing;
 using Microsoft.Extensions.DependencyInjection;
 using Ocelot.Configuration;
 using Ocelot.Configuration.Creator;
@@ -12,6 +10,12 @@ using Xunit;
 
 namespace Ocelot.UnitTests.Configuration
 {
+    using System.Net.Http;
+    using System.Threading;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Http;
+    using Ocelot.Logging;
+
     public class HttpHandlerOptionsCreatorTests
     {
         private IHttpHandlerOptionsCreator _httpHandlerOptionsCreator;
@@ -155,23 +159,21 @@ namespace Ocelot.UnitTests.Configuration
 
         private void GivenARealTracer()
         {
-            var tracer = new RealTracer();
+            var tracer = new FakeTracer();
-            _serviceCollection.AddSingleton<IServiceTracer, RealTracer>();
+            _serviceCollection.AddSingleton<ITracer, FakeTracer>();
             _serviceProvider = _serviceCollection.BuildServiceProvider();
             _httpHandlerOptionsCreator = new HttpHandlerOptionsCreator(_serviceProvider);
         }
 
-        class RealTracer : IServiceTracer
+        class FakeTracer : ITracer
         {
-            public ITracer Tracer => throw new NotImplementedException();
+            public void Event(HttpContext httpContext, string @event)
+            {
+                throw new NotImplementedException();
+            }
 
-            public string ServiceName => throw new NotImplementedException();
+            public Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken, Action<string> addTraceIdToRepo,
-
+                Func<HttpRequestMessage, CancellationToken, Task<HttpResponseMessage>> baseSendAsync)
-            public string Environment => throw new NotImplementedException();
-
-            public string Identity => throw new NotImplementedException();
-
-            public ISpan Start(ISpanBuilder spanBuilder)
             {
                 throw new NotImplementedException();
             }

test/Ocelot.UnitTests/DependencyInjection/OcelotBuilderTests.cs

@@ -23,6 +23,8 @@ using Ocelot.Middleware.Multiplexer;
 
 namespace Ocelot.UnitTests.DependencyInjection
 {
+    using Butterfly;
+
     public class OcelotBuilderTests
     {
         private readonly IServiceCollection _services;
@@ -140,15 +142,6 @@ namespace Ocelot.UnitTests.DependencyInjection
                 .BDDfy();
         }
 
-        [Fact]
-        public void should_set_up_tracing()
-        {
-            this.Given(x => WhenISetUpOcelotServices())
-                .When(x => WhenISetUpOpentracing())
-                .When(x => WhenIAccessOcelotHttpTracingHandler())
-                .BDDfy();
-        }
-
         [Fact]
         public void should_set_up_without_passing_in_config()
         {
@@ -387,24 +380,6 @@ namespace Ocelot.UnitTests.DependencyInjection
             }
         }
 
-        private void WhenISetUpOpentracing()
-        {
-            try
-            {
-                _ocelotBuilder.AddOpenTracing(
-                    option =>
-                    {
-                        option.CollectorUrl = "http://localhost:9618";
-                        option.Service = "Ocelot.ManualTest";
-                    }
-               );
-            }
-            catch (Exception e)
-            {
-                _ex = e;
-            }
-        }
-
         private void WhenIAccessLoggerFactory()
         {
             try

test/Ocelot.UnitTests/Requester/TracingHandlerFactoryTests.cs

@@ -1,27 +1,27 @@
+namespace Ocelot.UnitTests.Requester
+{
     using System;
-using Butterfly.Client.Tracing;
     using Microsoft.Extensions.DependencyInjection;
     using Moq;
     using Ocelot.Infrastructure.RequestData;
     using Ocelot.Requester;
     using Shouldly;
     using Xunit;
+    using Ocelot.Logging;
 
-namespace Ocelot.UnitTests.Requester
-{
     public class TracingHandlerFactoryTests
     {
-        private TracingHandlerFactory _factory;
+        private readonly TracingHandlerFactory _factory;
-        private Mock<IServiceTracer> _tracer;
+        private Mock<ITracer> _tracer;
         private IServiceCollection _serviceCollection;
         private IServiceProvider _serviceProvider;
         private Mock<IRequestScopedDataRepository> _repo;
 
         public TracingHandlerFactoryTests()
         {
-            _tracer = new Mock<IServiceTracer>();
+            _tracer = new Mock<ITracer>();
             _serviceCollection = new ServiceCollection();
-            _serviceCollection.AddSingleton<IServiceTracer>(_tracer.Object);
+            _serviceCollection.AddSingleton<ITracer>(_tracer.Object);
             _serviceProvider = _serviceCollection.BuildServiceProvider();
             _repo = new Mock<IRequestScopedDataRepository>();
             _factory = new TracingHandlerFactory(_serviceProvider, _repo.Object);