Fix/consul poller option (#899)

* cache key now can generate from query string for request with Get Methods and request content for requests with post methods

* MD5Helper Added. OutputCacheMiddleware now can generate cache key using method, url and content

* ConsulFileConfigurationPollerOption created. consul poller option bug fixed

* ConsulFileConfigurationPollerOptionTest created

src/Ocelot.Provider.Consul/OcelotBuilderExtensions.cs

@@ -3,6 +3,7 @@
     using Configuration.Repository;
     using DependencyInjection;
     using Microsoft.Extensions.DependencyInjection;
+    using Microsoft.Extensions.DependencyInjection.Extensions;
     using Middleware;
     using ServiceDiscovery;
 
@@ -12,6 +13,8 @@
         {
             builder.Services.AddSingleton<ServiceDiscoveryFinderDelegate>(ConsulProviderFactory.Get);
             builder.Services.AddSingleton<IConsulClientFactory, ConsulClientFactory>();
+            builder.Services.RemoveAll(typeof(IFileConfigurationPollerOptions));
+            builder.Services.AddSingleton<IFileConfigurationPollerOptions, ConsulFileConfigurationPollerOption>();
             return builder;
         }
 

src/Ocelot/Cache/Middleware/OutputCacheMiddleware.cs

@@ -77,6 +77,18 @@
             context.DownstreamResponse = response;
         }
 
+        private string GenerateRequestCacheKey(DownstreamContext context) {
+            string hashedContent = null;
+            StringBuilder downStreamUrlKeyBuilder = new StringBuilder($"{context.DownstreamRequest.Method}-{context.DownstreamRequest.OriginalString}");
+            if(context.DownstreamRequest.Content != null) {
+                string requestContentString = Task.Run(async () => await context.DownstreamRequest.Content?.ReadAsStringAsync()).Result;
+                downStreamUrlKeyBuilder.Append(requestContentString);
+            }
+
+            hashedContent = MD5Helper.GenerateMd5(downStreamUrlKeyBuilder.ToString());
+            return hashedContent;
+        }
+
         internal DownstreamResponse CreateHttpResponseMessage(CachedResponse cached)
         {
             if (cached == null)

src/Ocelot/Configuration/Repository/ConsulFileConfigurationPollerOption.cs

@@ -0,0 +1,38 @@
+using System.Threading.Tasks;
+using Ocelot.Responses;
+
+namespace Ocelot.Configuration.Repository {
+    public class ConsulFileConfigurationPollerOption : IFileConfigurationPollerOptions {
+        private readonly IInternalConfigurationRepository _internalConfigRepo;
+        private readonly IFileConfigurationRepository _fileConfigurationRepository;
+
+        public ConsulFileConfigurationPollerOption(IInternalConfigurationRepository internalConfigurationRepository,
+                                                   IFileConfigurationRepository fileConfigurationRepository) {
+            _internalConfigRepo = internalConfigurationRepository;
+            _fileConfigurationRepository = fileConfigurationRepository;
+        }
+
+        public int Delay => GetDelay();
+
+        private int GetDelay() {
+            int delay = 1000;
+
+            Response<File.FileConfiguration> fileConfig = Task.Run(async () => await _fileConfigurationRepository.Get()).Result;
+            if (fileConfig?.Data?.GlobalConfiguration?.ServiceDiscoveryProvider != null &&
+                    !fileConfig.IsError &&
+                    fileConfig.Data.GlobalConfiguration.ServiceDiscoveryProvider.PollingInterval > 0) {
+                delay = fileConfig.Data.GlobalConfiguration.ServiceDiscoveryProvider.PollingInterval;
+            }
+            else {
+                Response<IInternalConfiguration> internalConfig = _internalConfigRepo.Get();
+                if (internalConfig?.Data?.ServiceProviderConfiguration != null &&
+                !internalConfig.IsError &&
+                internalConfig.Data.ServiceProviderConfiguration.PollingInterval > 0) {
+                    delay = internalConfig.Data.ServiceProviderConfiguration.PollingInterval;
+                }
+            }
+
+            return delay;
+        }
+    }
+}

test/Ocelot.UnitTests/Configuration/FileConfigurationPollerTests.cs

@@ -126,6 +126,8 @@ namespace Ocelot.UnitTests.Configuration
                 .BDDfy();
         }
 
+        
+
         private void WhenProviderErrors()
         {
             _repo