Use Unlaunch feature flag

Author: tnguyenquy

src/Infrastructure/Infrastructure.csproj

@@ -12,6 +12,7 @@
 		<PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="5.0.0" />
 		<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.0" />
 		<PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.8.0" />
+		<PackageReference Include="unlaunch" Version="1.0.0" />
 	</ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\ApplicationCore\ApplicationCore.csproj" />

src/Web/Pages/Index.cshtml

@@ -1,4 +1,6 @@
 @page
+@using Microsoft.eShopWeb.Web.Services;
+@inject UnlaunchService UnlaunchService;
 @{
     ViewData["Title"] = "Catalog";
     @model IndexModel
@@ -27,11 +29,18 @@
         <partial name="_pagination" for="CatalogModel.PaginationInfo" />
 
         <div class="esh-catalog-items row">
-            @foreach (var catalogItem in Model.CatalogModel.CatalogItems)
-            {
-                <div class="esh-catalog-item col-md-4">
-                    <partial name="_product" for="@catalogItem" />
-                </div>
+            @{
+                if (UnlaunchService.IsEnabled(HttpContext.Connection.RemoteIpAddress.ToString()))
+                {
+                    Model.CatalogModel.CatalogItems.Reverse();
+                }
+
+                foreach (var catalogItem in Model.CatalogModel.CatalogItems)
+                {
+                    <div class="esh-catalog-item col-md-4">
+                        <partial name="_product" for="@catalogItem" />
+                    </div>
+                }
             }
         </div>
         <partial name="_pagination" for="CatalogModel.PaginationInfo" />

src/Web/Services/UnlaunchService.cs

@@ -0,0 +1,22 @@
+using io.unlaunch;
+
+namespace Microsoft.eShopWeb.Web.Services
+{
+    public class UnlaunchService
+    {
+        private const string FlagKey = "catalog_reverse";
+
+        private readonly IUnlaunchClient _client;
+
+        public UnlaunchService(IUnlaunchClient client)
+        {
+            _client = client;
+        }
+
+        public bool IsEnabled(string userIdentity)
+        {
+            var variation = _client.GetVariation(FlagKey, userIdentity);
+            return variation == "on";
+        }
+    }
+}

src/Web/Startup.cs

@@ -3,6 +3,7 @@
 using BlazorAdmin.Services;
 using Blazored.LocalStorage;
 using BlazorShared;
+using io.unlaunch;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.DataProtection;
@@ -16,6 +17,7 @@
 using Microsoft.eShopWeb.Infrastructure.Data;
 using Microsoft.eShopWeb.Infrastructure.Identity;
 using Microsoft.eShopWeb.Web.Configuration;
+using Microsoft.eShopWeb.Web.Services;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Diagnostics.HealthChecks;
@@ -161,6 +163,9 @@ public void ConfigureServices(IServiceCollection services)
             services.AddScoped<HttpService>();
             services.AddBlazorServices();
 
+            services.AddSingleton<IUnlaunchClient>(UnlaunchClient.Create("prod-server-0bdc1324-cbec-4740-83e9-86045d1cd93f"));
+            services.AddTransient<UnlaunchService>();
+
             services.AddDatabaseDeveloperPageExceptionFilter();
 
             _services = services; // used to debug registered services