plying around with service providers

src/Ocelot/Configuration/Creator/FileOcelotConfigurationCreator.cs

@@ -7,6 +7,7 @@ using Ocelot.Configuration.File;
 using Ocelot.Configuration.Parser;
 using Ocelot.Configuration.Validator;
 using Ocelot.Responses;
+using Ocelot.ServiceDiscovery;
 using Ocelot.Utilities;
 using Ocelot.Values;
 
@@ -104,7 +105,22 @@ namespace Ocelot.Configuration.Creator
 
             //ideal world we would get the host and port, then make the request using it, then release the connection to the lb
 
-            Func<HostAndPort> downstreamHostAndPortFunc = () => new HostAndPort(reRoute.DownstreamHost.Trim('/'), reRoute.DownstreamPort);
+            Func<HostAndPort> downstreamHostAndPortFunc = () => {
+
+                //service provider factory takes the reRoute
+                    //can return no service provider (just use ocelot config)
+                    //can return consol service provider
+                //returns a service provider
+                //we call get on the service provider
+                    //could reutrn services from consol or just configuration.json
+                //this returns a list of services and we take the first one
+                var hostAndPort = new HostAndPort(reRoute.DownstreamHost.Trim('/'), reRoute.DownstreamPort);
+                var services = new List<Service>();
+                var serviceProvider = new NoServiceProvider(services);
+                var service = serviceProvider.Get();
+                var firstHostAndPort = service[0].HostAndPort;
+                return firstHostAndPort;
+            };
 
             if (isAuthenticated)
             {

src/Ocelot/ServiceDiscovery/IServiceProvider.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+using Ocelot.Values;
+
+namespace Ocelot.ServiceDiscovery
+{
+    public interface IServiceProvider
+    {
+         List<Service> Get();
+    }
+}

src/Ocelot/ServiceDiscovery/IServiceProviderFactory.cs

@@ -0,0 +1,9 @@
+using Ocelot.Configuration;
+
+namespace Ocelot.ServiceDiscovery
+{
+    public interface IServiceProviderFactory
+    {
+        Ocelot.ServiceDiscovery.IServiceProvider Get(ReRoute reRoute);
+    }
+}

src/Ocelot/ServiceDiscovery/NoServiceProvider.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+using Ocelot.Values;
+
+namespace Ocelot.ServiceDiscovery
+{
+    public class NoServiceProvider : IServiceProvider
+    {
+        private List<Service> _services;
+
+        public NoServiceProvider(List<Service> services)
+        {
+            _services = services;
+        }
+
+        public List<Service> Get()
+        {
+            return _services;
+        }
+    }
+}

src/Ocelot/ServiceDiscovery/ServiceProviderFactory.cs

@@ -0,0 +1,13 @@
+using System;
+using Ocelot.Configuration;
+
+namespace Ocelot.ServiceDiscovery
+{
+    public class ServiceProviderFactory : IServiceProviderFactory
+    {
+        public  Ocelot.ServiceDiscovery.IServiceProvider Get(ReRoute reRoute)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/Ocelot/Values/Service.cs

@@ -0,0 +1,13 @@
+namespace Ocelot.Values
+{
+    public class Service
+    {
+        public Service(string name, HostAndPort hostAndPort)
+        {
+            Name = name;
+            HostAndPort = hostAndPort;
+        }
+        public string Name {get; private set;}
+        public HostAndPort HostAndPort {get; private set;}
+    }
+}

test/Ocelot.UnitTests/LeastConnectionTests.cs

@@ -14,7 +14,7 @@ namespace Ocelot.UnitTests
     {
         private HostAndPort _hostAndPort;
         private Response<HostAndPort> _result;
-        private LeastConnection _leastConnection;
+        private LeastConnectionLoadBalancer _leastConnection;
         private List<Service> _services;
 
         public LeastConnectionTests()
@@ -53,7 +53,7 @@ namespace Ocelot.UnitTests
             };
 
             _services = availableServices;
-            _leastConnection = new LeastConnection(() => _services, serviceName);
+            _leastConnection = new LeastConnectionLoadBalancer(() => _services, serviceName);
 
             var response = _leastConnection.Lease();
 
@@ -80,7 +80,7 @@ namespace Ocelot.UnitTests
             };
 
             _services = availableServices;
-            _leastConnection = new LeastConnection(() => _services, serviceName);
+            _leastConnection = new LeastConnectionLoadBalancer(() => _services, serviceName);
 
             var response = _leastConnection.Lease();
 
@@ -111,7 +111,7 @@ namespace Ocelot.UnitTests
             };
 
             _services = availableServices;
-            _leastConnection = new LeastConnection(() => _services, serviceName);
+            _leastConnection = new LeastConnectionLoadBalancer(() => _services, serviceName);
 
             var response = _leastConnection.Lease();
 
@@ -178,7 +178,7 @@ namespace Ocelot.UnitTests
         private void GivenTheLoadBalancerStarts(List<Service> services, string serviceName)
         {
             _services = services;
-            _leastConnection = new LeastConnection(() => _services, serviceName);
+            _leastConnection = new LeastConnectionLoadBalancer(() => _services, serviceName);
         }
 
         private void WhenTheLoadBalancerStarts(List<Service> services, string serviceName)
@@ -203,13 +203,13 @@ namespace Ocelot.UnitTests
         }
     }
 
-    public class LeastConnection : ILoadBalancer
+    public class LeastConnectionLoadBalancer : ILoadBalancer
     {
         private Func<List<Service>> _services;
         private List<Lease> _leases;
         private string _serviceName;
 
-        public LeastConnection(Func<List<Service>> services, string serviceName)
+        public LeastConnectionLoadBalancer(Func<List<Service>> services, string serviceName)
         {
             _services = services;
             _serviceName = serviceName;

test/Ocelot.UnitTests/LoadBalancerFactoryTests.cs

@@ -1,4 +1,7 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
+using Moq;
 using Ocelot.Configuration;
 using Ocelot.Configuration.Builder;
 using Ocelot.Responses;
@@ -14,10 +17,12 @@ namespace Ocelot.UnitTests
         private ReRoute _reRoute;
         private LoadBalancerFactory _factory;
         private ILoadBalancer _result;
+        private Mock<Ocelot.ServiceDiscovery.IServiceProvider> _serviceProvider;
         
         public LoadBalancerFactoryTests()
         {
-            _factory = new LoadBalancerFactory();
+            _serviceProvider = new Mock<Ocelot.ServiceDiscovery.IServiceProvider>();
+            _factory = new LoadBalancerFactory(_serviceProvider.Object);
         }
 
         [Fact]
@@ -36,8 +41,8 @@ namespace Ocelot.UnitTests
         public void should_return_round_robin_load_balancer()
         {
              var reRoute = new ReRouteBuilder()
-             .WithLoadBalancer("RoundRobin")
-            .Build();
+                .WithLoadBalancer("RoundRobin")
+                .Build();
 
             this.Given(x => x.GivenAReRoute(reRoute))
                 .When(x => x.WhenIGetTheLoadBalancer())
@@ -45,6 +50,38 @@ namespace Ocelot.UnitTests
                 .BDDfy();
         }
 
+        [Fact]
+        public void should_return_round_least_connection_balancer()
+        {
+             var reRoute = new ReRouteBuilder()
+                .WithLoadBalancer("LeastConnection")
+                .Build();
+
+            this.Given(x => x.GivenAReRoute(reRoute))
+                .When(x => x.WhenIGetTheLoadBalancer())
+                .Then(x => x.ThenTheLoadBalancerIsReturned<LeastConnectionLoadBalancer>())
+                .BDDfy();
+        }
+
+        [Fact]
+        public void should_call_service_provider()
+        {
+            var reRoute = new ReRouteBuilder()
+                .WithLoadBalancer("RoundRobin")
+                .Build();
+
+            this.Given(x => x.GivenAReRoute(reRoute))
+                .When(x => x.WhenIGetTheLoadBalancer())
+                .Then(x => x.ThenTheServiceProviderIsCalledCorrectly(reRoute))
+                .BDDfy();
+        }
+
+        private void ThenTheServiceProviderIsCalledCorrectly(ReRoute reRoute)
+        {
+            _serviceProvider
+                .Verify(x => x.Get(), Times.Once);
+        }
+
         private void GivenAReRoute(ReRoute reRoute)
         {
             _reRoute = reRoute;
@@ -61,16 +98,62 @@ namespace Ocelot.UnitTests
         }
     }
 
-    public class NoLoadBalancer : ILoadBalancer
+    public class NoLoadBalancerTests
     {
-        Response<HostAndPort> ILoadBalancer.Lease()
+        private List<Service> _services;
+        private NoLoadBalancer _loadBalancer;
+        private Response<HostAndPort> _result;
+
+        [Fact]
+        public void should_return_host_and_port()
         {
-            throw new NotImplementedException();
+            var hostAndPort = new HostAndPort("127.0.0.1", 80);
+
+            var services = new List<Service>
+            {
+                new Service("product", hostAndPort)
+            };
+            this.Given(x => x.GivenServices(services))
+            .When(x => x.WhenIGetTheNextHostAndPort())
+            .Then(x => x.ThenTheHostAndPortIs(hostAndPort))
+            .BDDfy();
         }
 
-        Response ILoadBalancer.Release(HostAndPort hostAndPort)
+        private void GivenServices(List<Service> services)
         {
-            throw new NotImplementedException();
+            _services = services;
+        }
+
+        private void WhenIGetTheNextHostAndPort()
+        {
+            _loadBalancer = new NoLoadBalancer(_services);
+            _result = _loadBalancer.Lease();
+        }
+
+        private void ThenTheHostAndPortIs(HostAndPort expected)
+        {
+            _result.Data.ShouldBe(expected);
+        }
+    }
+
+    public class NoLoadBalancer : ILoadBalancer
+    {
+        private List<Service> _services;
+
+        public NoLoadBalancer(List<Service> services)
+        {
+            _services = services;
+        }
+        
+        public Response<HostAndPort> Lease()
+        {
+            var service =  _services.FirstOrDefault();
+            return new OkResponse<HostAndPort>(service.HostAndPort);
+        }
+
+        public Response Release(HostAndPort hostAndPort)
+        {   
+            return new OkResponse();
         }
     }
 
@@ -81,14 +164,23 @@ namespace Ocelot.UnitTests
 
     public class LoadBalancerFactory : ILoadBalancerFactory
     {
+        private Ocelot.ServiceDiscovery.IServiceProvider _serviceProvider;
+
+        public LoadBalancerFactory(Ocelot.ServiceDiscovery.IServiceProvider serviceProvider)
+        {
+            _serviceProvider = serviceProvider;
+        }
+
         public ILoadBalancer Get(ReRoute reRoute)
         {
             switch (reRoute.LoadBalancer)
             {
                 case "RoundRobin":
-                    return new RoundRobinLoadBalancer(null);
+                    return new RoundRobinLoadBalancer(_serviceProvider.Get());
+                case "LeastConnection":
+                    return new LeastConnectionLoadBalancer(() => _serviceProvider.Get(), reRoute.ServiceName);
                 default:
-                    return new NoLoadBalancer();
+                    return new NoLoadBalancer(_serviceProvider.Get());
             }
         }
     }

test/Ocelot.UnitTests/NoServiceProviderTests.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using Ocelot.Configuration;
+using Ocelot.ServiceDiscovery;
+using Ocelot.Values;
+using Shouldly;
+using TestStack.BDDfy;
+using Xunit;
+
+namespace Ocelot.UnitTests
+{
+    public class NoServiceProviderTests
+    {
+        private NoServiceProvider _serviceProvider;
+        private HostAndPort _hostAndPort;
+        private List<Service> _result;
+        private List<Service> _expected;
+
+        [Fact]
+        public void should_return_services()
+        {
+            var hostAndPort = new HostAndPort("127.0.0.1", 80);
+
+            var services = new List<Service>
+            {
+                new Service("product", hostAndPort)
+            };
+
+            this.Given(x => x.GivenAHostAndPort(services))
+                .When(x => x.WhenIGetTheService())
+                .Then(x => x.ThenTheFollowingIsReturned(services))
+                .BDDfy();
+        }
+
+        private void GivenAHostAndPort(List<Service> services)
+        {
+            _expected = services;
+        }
+
+        private void WhenIGetTheService()
+        {
+            _serviceProvider = new NoServiceProvider(_expected);
+            _result = _serviceProvider.Get();
+        }
+
+        private void ThenTheFollowingIsReturned(List<Service> services)
+        {
+            _result[0].HostAndPort.DownstreamHost.ShouldBe(services[0].HostAndPort.DownstreamHost);
+
+            _result[0].HostAndPort.DownstreamPort.ShouldBe(services[0].HostAndPort.DownstreamPort);
+
+            _result[0].Name.ShouldBe(services[0].Name);
+        }
+    }
+}

test/Ocelot.UnitTests/RoundRobinTests.cs

@@ -11,19 +11,19 @@ namespace Ocelot.UnitTests
     public class RoundRobinTests
     {
         private readonly RoundRobinLoadBalancer _roundRobin;
-        private readonly List<HostAndPort> _hostAndPorts;
+        private readonly List<Service> _services;
         private Response<HostAndPort> _hostAndPort;
 
         public RoundRobinTests()
         {
-            _hostAndPorts = new List<HostAndPort>
+            _services = new List<Service>
             {
-                new HostAndPort("127.0.0.1", 5000),
-                new HostAndPort("127.0.0.1", 5001),
-                new HostAndPort("127.0.0.1", 5001)
+                new Service("product", new HostAndPort("127.0.0.1", 5000)),
+                new Service("product", new HostAndPort("127.0.0.1", 5001)),
+                new Service("product", new HostAndPort("127.0.0.1", 5001))
             };
 
-            _roundRobin = new RoundRobinLoadBalancer(_hostAndPorts);
+            _roundRobin = new RoundRobinLoadBalancer(_services);
         }
 
         [Fact]
@@ -46,11 +46,11 @@ namespace Ocelot.UnitTests
             while (stopWatch.ElapsedMilliseconds < 1000)
             {
                 var address = _roundRobin.Lease();
-                address.Data.ShouldBe(_hostAndPorts[0]);
+                address.Data.ShouldBe(_services[0].HostAndPort);
                 address = _roundRobin.Lease();
-                address.Data.ShouldBe(_hostAndPorts[1]);
+                address.Data.ShouldBe(_services[1].HostAndPort);
                 address = _roundRobin.Lease();
-                address.Data.ShouldBe(_hostAndPorts[2]);
+                address.Data.ShouldBe(_services[2].HostAndPort);
             }
         }
 
@@ -61,7 +61,7 @@ namespace Ocelot.UnitTests
 
         private void ThenTheNextAddressIndexIs(int index)
         {
-            _hostAndPort.Data.ShouldBe(_hostAndPorts[index]);
+            _hostAndPort.Data.ShouldBe(_services[index].HostAndPort);
         }
     }
 
@@ -73,24 +73,24 @@ namespace Ocelot.UnitTests
 
     public class RoundRobinLoadBalancer : ILoadBalancer
     {
-        private readonly List<HostAndPort> _hostAndPorts;
+        private readonly List<Service> _services;
         private int _last;
 
-        public RoundRobinLoadBalancer(List<HostAndPort> hostAndPorts)
+        public RoundRobinLoadBalancer(List<Service> services)
         {
-            _hostAndPorts = hostAndPorts;
+            _services = services;
         }
 
         public Response<HostAndPort> Lease()
         {
-            if (_last >= _hostAndPorts.Count)
+            if (_last >= _services.Count)
             {
                 _last = 0;
             }
 
-            var next = _hostAndPorts[_last];
+            var next = _services[_last];
             _last++;
-            return new OkResponse<HostAndPort>(next);
+            return new OkResponse<HostAndPort>(next.HostAndPort);
         }
 
         public Response Release(HostAndPort hostAndPort)

test/Ocelot.UnitTests/ServiceProviderFactoryTests.cs

@@ -0,0 +1,50 @@
+using Ocelot.Configuration;
+using Ocelot.Configuration.Builder;
+using Ocelot.ServiceDiscovery;
+using Shouldly;
+using TestStack.BDDfy;
+using Xunit;
+
+namespace Ocelot.UnitTests
+{
+    public class ServiceProviderFactoryTests
+    {
+        private ReRoute _reRote;
+        private IServiceProvider _result;
+        private ServiceProviderFactory _factory;
+
+        public ServiceProviderFactoryTests()
+        {
+            _factory = new ServiceProviderFactory();
+        }
+        
+        [Fact]
+        public void should_return_no_service_provider()
+        {
+            var reRoute = new ReRouteBuilder()
+            .WithDownstreamHost("127.0.0.1")
+            .WithDownstreamPort(80)
+            .Build();
+
+            this.Given(x => x.GivenTheReRoute(reRoute))
+                .When(x => x.WhenIGetTheServiceProvider())
+                .Then(x => x.ThenTheServiceProviderIs<NoServiceProvider>())
+                .BDDfy();
+        }
+
+        private void GivenTheReRoute(ReRoute reRoute)
+        {
+            _reRote = reRoute;
+        }
+
+        private void WhenIGetTheServiceProvider()
+        {
+            _result = _factory.Get(_reRote);
+        }
+
+        private void ThenTheServiceProviderIs<T>()
+        {
+            _result.ShouldBeOfType<T>();
+        }
+    }
+}

test/Ocelot.UnitTests/ServiceRegistryTests.cs

@@ -86,6 +86,7 @@ namespace Ocelot.UnitTests
         {
             _repository = repository;
         }   
+
         public void Register(Service serviceNameAndAddress)
         {
             _repository.Set(serviceNameAndAddress);
@@ -97,17 +98,6 @@ namespace Ocelot.UnitTests
         }
     }
 
-    public class Service
-    {
-        public Service(string name, HostAndPort hostAndPort)
-        {
-            Name = name;
-            HostAndPort = hostAndPort;
-        }
-        public string Name {get; private set;}
-        public HostAndPort HostAndPort {get; private set;}
-    }
-
     public interface IServiceRepository
     {
         List<Service> Get(string serviceName);