Refactoing HttpClientApi

src/Web/WebMVC/Services/BasketService.cs

@@ -14,15 +14,16 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
     public class BasketService : IBasketService
     {
         private readonly IOptionsSnapshot<AppSettings> _settings;
-        private HttpClientWrapper _apiClient;
+        private IHttpClient _apiClient;
         private readonly string _remoteServiceBaseUrl;
         private IHttpContextAccessor _httpContextAccesor;
 
-        public BasketService(IOptionsSnapshot<AppSettings> settings, IHttpContextAccessor httpContextAccesor)
+        public BasketService(IOptionsSnapshot<AppSettings> settings, IHttpContextAccessor httpContextAccesor, IHttpClient httpClient)
         {
             _settings = settings;
             _remoteServiceBaseUrl = _settings.Value.BasketUrl;
             _httpContextAccesor = httpContextAccesor;
+            _apiClient = httpClient;
         }
 
         public async Task<Basket> GetBasket(ApplicationUser user)
@@ -30,7 +31,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
             var context = _httpContextAccesor.HttpContext;
             var token = await context.Authentication.GetTokenAsync("access_token");
 
-            var _apiClient = new HttpClientWrapper();
             _apiClient.Inst.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
 
             var basketUrl = $"{_remoteServiceBaseUrl}/{user.Id.ToString()}";
@@ -51,8 +51,7 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
         {
             var context = _httpContextAccesor.HttpContext;
             var token = await context.Authentication.GetTokenAsync("access_token");
-
+           
-            _apiClient = new HttpClientWrapper();
             _apiClient.Inst.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
 
             var basketUrl = _remoteServiceBaseUrl;
@@ -119,7 +118,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
             var context = _httpContextAccesor.HttpContext;
             var token = await context.Authentication.GetTokenAsync("access_token");
 
-            _apiClient = new HttpClientWrapper();
             _apiClient.Inst.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
             var basketUrl = $"{_remoteServiceBaseUrl}/{user.Id.ToString()}";
             var response = await _apiClient.DeleteAsync(basketUrl);

src/Web/WebMVC/Services/CatalogService.cs

@@ -13,20 +13,19 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
     public class CatalogService : ICatalogService
     {
         private readonly IOptionsSnapshot<AppSettings> _settings;
-        private HttpClientWrapper _apiClient;
+        private IHttpClient _apiClient;
         private readonly string _remoteServiceBaseUrl;
   
-        public CatalogService(IOptionsSnapshot<AppSettings> settings, ILoggerFactory loggerFactory) {
+        public CatalogService(IOptionsSnapshot<AppSettings> settings, ILoggerFactory loggerFactory, IHttpClient httpClient) {
             _settings = settings;
             _remoteServiceBaseUrl = $"{_settings.Value.CatalogUrl}/api/v1/catalog/";
-
+            _apiClient = httpClient;
             var log = loggerFactory.CreateLogger("catalog service");
             log.LogDebug(settings.Value.CatalogUrl);
         }
          
         public async Task<Catalog> GetCatalogItems(int page,int take, int? brand, int? type)
         {
-            _apiClient = new HttpClientWrapper();
             var itemsQs = $"items?pageIndex={page}&pageSize={take}";
             var filterQs = "";
 
@@ -53,7 +52,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
 
         public async Task<IEnumerable<SelectListItem>> GetBrands()
         {
-            _apiClient = new HttpClientWrapper();
             var url = $"{_remoteServiceBaseUrl}catalogBrands";
             var dataString = await _apiClient.GetStringAsync(url);
 
@@ -72,7 +70,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
 
         public async Task<IEnumerable<SelectListItem>> GetTypes()
         {
-            _apiClient = new HttpClientWrapper();
             var url = $"{_remoteServiceBaseUrl}catalogTypes";
             var dataString = await _apiClient.GetStringAsync(url);
 

src/Web/WebMVC/Services/OrderingService.cs

@@ -14,24 +14,23 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
 {
     public class OrderingService : IOrderingService
     {
-        private HttpClientWrapper _apiClient;
+        private IHttpClient _apiClient;
         private readonly string _remoteServiceBaseUrl;
         private readonly IOptionsSnapshot<AppSettings> _settings;
         private readonly IHttpContextAccessor _httpContextAccesor;
 
-        public OrderingService(IOptionsSnapshot<AppSettings> settings, IHttpContextAccessor httpContextAccesor)
+        public OrderingService(IOptionsSnapshot<AppSettings> settings, IHttpContextAccessor httpContextAccesor, IHttpClient httpClient)
         {
             _remoteServiceBaseUrl = $"{settings.Value.OrderingUrl}/api/v1/orders";
             _settings = settings;
             _httpContextAccesor = httpContextAccesor;
+            _apiClient = httpClient;
         }
 
         async public Task<Order> GetOrder(ApplicationUser user, string Id)
         {
             var context = _httpContextAccesor.HttpContext;
             var token = await context.Authentication.GetTokenAsync("access_token");
-
-            _apiClient = new HttpClientWrapper();
             _apiClient.Inst.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
 
             var ordersUrl = $"{_remoteServiceBaseUrl}/{Id}";
@@ -47,7 +46,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
             var context = _httpContextAccesor.HttpContext;
             var token = await context.Authentication.GetTokenAsync("access_token");
 
-            _apiClient = new HttpClientWrapper();
             _apiClient.Inst.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
 
             var ordersUrl = _remoteServiceBaseUrl;
@@ -78,7 +76,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
             var context = _httpContextAccesor.HttpContext;
             var token = await context.Authentication.GetTokenAsync("access_token");
 
-            _apiClient = new HttpClientWrapper();            
             _apiClient.Inst.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
             _apiClient.Inst.DefaultRequestHeaders.Add("x-requestid", order.RequestId.ToString());
 

src/Web/WebMVC/Services/Utilities/HttpApiClient.cs

@@ -0,0 +1,45 @@
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace WebMVC.Services.Utilities
+{
+    public class HttpApiClient : IHttpClient
+    {
+        private HttpClient _client;
+        private ILogger _logger;
+        public HttpClient Inst => _client;
+        public HttpApiClient()
+        {
+            _client = new HttpClient();
+            _logger = new LoggerFactory().CreateLogger(nameof(HttpApiClientWrapper));
+        }
+
+        public async Task<string> GetStringAsync(string uri)
+        {
+            return await HttpInvoker(async () =>
+                await _client.GetStringAsync(uri));
+        }
+
+        public async Task<HttpResponseMessage> PostAsync<T>(string uri, T item)
+        {
+            var contentString = new StringContent(JsonConvert.SerializeObject(item), System.Text.Encoding.UTF8, "application/json");
+            return await HttpInvoker(async () =>
+                    await _client.PostAsync(uri, contentString));
+        }
+
+        public async Task<HttpResponseMessage> DeleteAsync(string uri)
+        {
+            return await HttpInvoker(async () =>
+                await _client.DeleteAsync(uri));
+        }
+
+        private async Task<T> HttpInvoker<T>(Func<Task<T>> action)
+        {
+            return await action();
+        }
+    }
+}
+

src/Web/WebMVC/Services/Utilities/HttpApiClientWrapper.cs

@@ -8,16 +8,16 @@ using System.Threading.Tasks;
 
 namespace WebMVC.Services.Utilities
 {
-    public class HttpClientWrapper
+    public class HttpApiClientWrapper : IHttpClient
     {
         private HttpClient _client;
         private PolicyWrap _policyWrapper;
         private ILogger _logger;
         public HttpClient Inst => _client;
-        public HttpClientWrapper()
+        public HttpApiClientWrapper()
         {
             _client = new HttpClient();
-            _logger = new LoggerFactory().CreateLogger(nameof(HttpClientWrapper));
+            _logger = new LoggerFactory().CreateLogger(nameof(HttpApiClientWrapper));
 
             // Add Policies to be applied
             _policyWrapper = Policy.WrapAsync(

src/Web/WebMVC/Services/Utilities/IHttpClient.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace WebMVC.Services.Utilities
+{
+    public interface IHttpClient
+    {
+        HttpClient Inst { get; }
+        Task<string> GetStringAsync(string uri);
+        Task<HttpResponseMessage> PostAsync<T>(string uri, T item);
+        Task<HttpResponseMessage> DeleteAsync(string uri);
+    }
+}

src/Web/WebMVC/Startup.cs

@@ -14,6 +14,7 @@ using Microsoft.IdentityModel.Tokens;
 using Microsoft.AspNetCore.Http;
 using System.Threading;
 using Microsoft.Extensions.Options;
+using WebMVC.Services.Utilities;
 
 namespace Microsoft.eShopOnContainers.WebMVC
 {
@@ -43,14 +44,22 @@ namespace Microsoft.eShopOnContainers.WebMVC
         {
             services.AddMvc();
             services.Configure<AppSettings>(Configuration);
-
+            
             // Add application services.
-            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
+            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();            
-
             services.AddTransient<ICatalogService, CatalogService>(); 
             services.AddTransient<IOrderingService, OrderingService>(); 
             services.AddTransient<IBasketService, BasketService>();
             services.AddTransient<IIdentityParser<ApplicationUser>, IdentityParser>();
+
+            if(Configuration.GetValue<string>("ActivateCircuitBreaker") == bool.TrueString)
+            {
+                services.AddSingleton<IHttpClient, HttpApiClientWrapper>();
+            }
+            else
+            {
+                services.AddSingleton<IHttpClient, HttpApiClient>();
+            }
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

src/Web/WebMVC/appsettings.json

@@ -4,6 +4,7 @@
   "BasketUrl": "http://localhost:5103",
   "IdentityUrl": "http://localhost:5105",
   "CallBackUrl": "http://localhost:5100/",
+  "ActivateCircuitBreaker": "True",
   "Logging": {
     "IncludeScopes": false,
     "LogLevel": {