Added UI alert and circuit-breaker handlers for components that depend on Basket.api

src/BuildingBlocks/Resilience/Resilience.Http/ResilientHttpClient.cs

@@ -81,6 +81,14 @@ namespace Microsoft.eShopOnContainers.BuildingBlocks.Resilience.Http
 
                 var response = await _client.SendAsync(requestMessage);
 
+                // raise exception if HttpResponseCode 500 
+                // needed for circuit breaker to track fails
+
+                if (response.StatusCode == HttpStatusCode.InternalServerError)
+                {
+                    throw new HttpRequestException();
+                }
+
                 return await response.Content.ReadAsStringAsync();
             });
         }

src/Services/Basket/Basket.API/Program.cs

@@ -15,8 +15,6 @@ namespace Microsoft.eShopOnContainers.Services.Basket.API
                 .UseFailing(options =>
                 {
                     options.ConfigPath = "/Failing";                   
-                    options.EndpointPaths = new List<string>()
-                    { "/api/v1/basket/checkout", "/hc" };
                 })
                 .UseHealthChecks("/hc")
                 .UseContentRoot(Directory.GetCurrentDirectory())

src/Web/WebMVC/Controllers/CartController.cs

@@ -7,6 +7,7 @@ using Microsoft.eShopOnContainers.WebMVC.Services;
 using Microsoft.eShopOnContainers.WebMVC.ViewModels;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Authentication;
+using Polly.CircuitBreaker;
 
 namespace Microsoft.eShopOnContainers.WebMVC.Controllers
 {
@@ -25,17 +26,28 @@ namespace Microsoft.eShopOnContainers.WebMVC.Controllers
         }
 
         public async Task<IActionResult> Index()
+        {
+            try
             {
                 var user = _appUserParser.Parse(HttpContext.User);
                 var vm = await _basketSvc.GetBasket(user);
 
-
                 return View(vm);
             }
+            catch (BrokenCircuitException)
+            {
+                // Catch error when Basket.api is in circuit-opened mode                 
+                HandleBrokenCircuitException();
+            }
+
+            return View();
+        }
 
         
         [HttpPost]
         public async Task<IActionResult> Index(Dictionary<string, int> quantities, string action)
+        {
+            try
             {
                 var user = _appUserParser.Parse(HttpContext.User);
                 var basket = await _basketSvc.SetQuantities(user, quantities);
@@ -46,11 +58,19 @@ namespace Microsoft.eShopOnContainers.WebMVC.Controllers
                     var order = _basketSvc.MapBasketToOrder(basket);
                     return RedirectToAction("Create", "Order");
                 }
+            }
+            catch (BrokenCircuitException)
+            {
+                // Catch error when Basket.api is in circuit-opened mode                 
+                HandleBrokenCircuitException();
+            }
 
-            return View(vm);
+            return View();
         }
 
         public async Task<IActionResult> AddToCart(CatalogItem productDetails)
+        {
+            try
             {
                 if (productDetails.Id != null)
                 {
@@ -68,5 +88,18 @@ namespace Microsoft.eShopOnContainers.WebMVC.Controllers
                 }
                 return RedirectToAction("Index", "Catalog");            
             }
+            catch (BrokenCircuitException)
+            {
+                // Catch error when Basket.api is in circuit-opened mode                 
+                HandleBrokenCircuitException();
+            }
+
+            return RedirectToAction("Index", "Catalog");
+        }
+
+        private void HandleBrokenCircuitException()
+        {
+            TempData["BasketInoperativeMsg"] = "Basket Service is inoperative, please try later on. (Business Msg Due to Circuit-Breaker)";
+        }
     }
 }

src/Web/WebMVC/Startup.cs

@@ -41,6 +41,7 @@ namespace Microsoft.eShopOnContainers.WebMVC
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddMvc();            
+            services.AddSession();
 
             if (Configuration.GetValue<string>("IsClusterEnv") == bool.TrueString)
             {
@@ -104,6 +105,7 @@ namespace Microsoft.eShopOnContainers.WebMVC
                 app.UseExceptionHandler("/Catalog/Error");
             }
 
+            app.UseSession();
             app.UseStaticFiles();
 
             app.UseCookieAuthentication(new CookieAuthenticationOptions

src/Web/WebMVC/ViewComponents/Cart.cs

@@ -29,7 +29,6 @@ namespace Microsoft.eShopOnContainers.WebMVC.ViewComponents
             {
                 // Catch error when Basket.api is in circuit-opened mode                 
                 ViewBag.IsBasketInoperative = true;
-                vm.ItemsCount = 0;
             }
 
             return View(vm);

src/Web/WebMVC/ViewComponents/CartList.cs

@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Polly.CircuitBreaker;
 
 namespace Microsoft.eShopOnContainers.WebMVC.ViewComponents
 {
@@ -16,8 +17,19 @@ namespace Microsoft.eShopOnContainers.WebMVC.ViewComponents
 
         public async Task<IViewComponentResult> InvokeAsync(ApplicationUser user)
         {
-            var item = await GetItemsAsync(user);
-            return View(item);
+            var vm = new Basket();
+            try
+            {
+                vm = await GetItemsAsync(user);
+                return View(vm);
+            }
+            catch (BrokenCircuitException)
+            {               
+                // Catch error when Basket.api is in circuit-opened mode                 
+                TempData["BasketInoperativeMsg"] = "Basket Service is inoperative, please try later on. (Business Msg Due to Circuit-Breaker)";
+            }
+
+            return View(vm);
         }
         
         private Task<Basket> GetItemsAsync(ApplicationUser user) => _cartSvc.GetBasket(user);

src/Web/WebMVC/Views/Catalog/Index.cshtml

@@ -23,6 +23,15 @@
 </section>
 
 <div class="container">
+    <div class="row">
+        <br />
+        @if(TempData.ContainsKey("BasketInoperativeMsg"))
+        {
+            <div class="alert alert-warning" role="alert">
+                &nbsp;@TempData["BasketInoperativeMsg"]
+            </div>
+        }
+    </div>
 
     @if (Model.CatalogItems.Count() > 0)
     {

src/Web/WebMVC/Views/Shared/Components/Cart/Default.cshtml

@@ -8,17 +8,20 @@
    asp-area="" 
    asp-controller="Cart" 
    asp-action="Index">    
-    <div class="esh-basketstatus-image">
-        <img src="~/images/cart.png" />
-    </div>
     @if (ViewBag.IsBasketInoperative == true)
     {
+        <div class="esh-basketstatus-image">
+            <img src="~/images/cart-inoperative.png" />            
+        </div>
         <div class="esh-basketstatus-badge-inoperative">
-            @Model.ItemsCount
+            X           
         </div>        
     }
     else
     {
+        <div class="esh-basketstatus-image">
+            <img src="~/images/cart.png" />
+        </div>
         <div class="esh-basketstatus-badge">
             @Model.ItemsCount
         </div>

src/Web/WebMVC/Views/Shared/Components/CartList/Default.cshtml

@@ -5,7 +5,24 @@
 }
 
 <div class="container">
+    @if (TempData.ContainsKey("BasketInoperativeMsg"))
+    {
+        <br />
+        <div class="alert alert-warning" role="alert">
+            &nbsp;@TempData["BasketInoperativeMsg"]
+        </div>
+    }
+    else
+    {
         <article class="esh-basket-titles row">
+            <br />
+            @if (TempData.ContainsKey("BasketInoperativeMsg"))
+            {
+                <div class="alert alert-warning" role="alert">
+                    &nbsp;@TempData["BasketInoperativeMsg"]
+                </div>
+            }
+
             <section class="esh-basket-title col-xs-3">Product</section>
             <section class="esh-basket-title col-xs-3 hidden-lg-down"></section>
             <section class="esh-basket-title col-xs-2">Price</section>
@@ -41,12 +58,10 @@
                     <div class="alert alert-warning esh-basket-margin12" role="alert">&nbsp;Note that the price of this article changed in our Catalog. The old price when you originally added it to the basket was $ @item.OldUnitPrice </div>
                 }
             </div>
-        <br/>
-        
+            <br />
         }
-</div>
 
-<div class="container">
+        <div class="container">
             <article class="esh-basket-titles esh-basket-titles--clean row">
                 <section class="esh-basket-title col-xs-10"></section>
                 <section class="esh-basket-title col-xs-2">Total</section>
@@ -68,4 +83,9 @@
                            value="[ Checkout ]" name="action" />
                 </section>
             </article>
+        </div>
+    }
+    
 </div>
+
+    

src/Web/WebMVC/WebMVC.csproj

@@ -41,6 +41,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.3" />
     <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.1.2" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.1.2" />
+    <PackageReference Include="Microsoft.AspNetCore.Session" Version="1.1.2" />
     <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="1.1.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.2" />