購物車商品的CRUD

訂閱商品價格更新事件，進行購物車商品同步處理

購物車結算事件發布

訂閱訂單成功創建事件，進行購物車的清空操作

ASP.NET Core Web API

Entity Framework Core

Redis

Swashbuckle（可選）

Autofac

Eventbus

Newtonsoft.Json

通過對?CustomerBasket對象進行json格式的序列化和反序列化來完成在redis中的持久化和讀取。

以單例模式注入redis連接?ConnectionMultiplexer，該對象最終通過構造函數注入到?RedisBasketRepository中。

services.AddSingleton<ConnectionMultiplexer>(sp =>

{

? ?var settings = sp.GetRequiredService<IOptions<BasketSettings>>().Value;

? ?var configuration = ConfigurationOptions.Parse(settings.ConnectionString, true);

? ?configuration.ResolveDns = true;

? ?return ConnectionMultiplexer.Connect(configuration);

});

事件發布：當用戶點擊購物車結算時，發布用戶結算事件。

事件消費：訂單創建成功后，進行購物車的清空

事件消費：商品價格更新后，進行購物車相關商品的價格同步

private void ConfigureEventBus(IApplicationBuilder app)

{

? ?var eventBus = app.ApplicationServices.GetRequiredService<IEventBus>();

? ?eventBus.Subscribe<ProductPriceChangedIntegrationEvent, ProductPriceChangedIntegrationEventHandler>();

? ?eventBus.Subscribe<OrderStartedIntegrationEvent, OrderStartedIntegrationEventHandler>();

}

private void ConfigureAuthService(IServiceCollection services)

{

? ?// prevent from mapping "sub" claim to nameidentifier.

? ?JwtSecurityTokenHandler.DefaultInboundClaimTypeMap.Clear();

? ?var identityUrl = Configuration.GetValue<string>("IdentityUrl");

? ?services.AddAuthentication(options =>

? ?{

? ? ? ?options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;

? ? ? ?options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;

? ?}).AddJwtBearer(options =>

? ?{

? ? ? ?options.Authority = identityUrl;

? ? ? ?options.RequireHttpsMetadata = false;

? ? ? ?options.Audience = "basket";

? ?});

}

protected virtual void ConfigureAuth(IApplicationBuilder app)

{

? ?if (Configuration.GetValue<bool>("UseLoadTest"))

? ?{

? ? ? ?app.UseMiddleware<ByPassAuthMiddleware>();

? ?}

? ?app.UseAuthentication();

}

public class CartController : Controller

{

? ?//…

? ?public async Task<IActionResult> Index()

? ?{

? ? ? ?try

? ? ? ?{ ? ? ? ? ?

? ? ? ? ? ?var user = _appUserParser.Parse(HttpContext.User);

? ? ? ? ? ?//Http requests using the Typed Client (Service Agent)

? ? ? ? ? ?var vm = await _basketSvc.GetBasket(user);

? ? ? ? ? ?return View(vm);

? ? ? ?}

? ? ? ?catch (BrokenCircuitException)

? ? ? ?{

? ? ? ? ? ?// Catches error when Basket.api is in circuit-opened mode ? ? ? ? ? ? ? ?

? ? ? ? ? ?HandleBrokenCircuitException();

? ? ? ?}

? ? ? ?return View();

? ?} ? ? ?

? ?private void HandleBrokenCircuitException()

? ?{

? ? ? ?TempData["BasketInoperativeMsg"] = "Basket Service is inoperative, please try later on. (Business message due to Circuit-Breaker)";

? ?}

}

// Add framework services.

services.AddMvc(options =>

{

? ?options.Filters.Add(typeof(HttpGlobalExceptionFilter));

? ?options.Filters.Add(typeof(ValidateModelStateFilter));

}).AddControllersAsServices();

public class ValidateModelStateFilter : ActionFilterAttribute

{

? ?public override void OnActionExecuting(ActionExecutingContext context)

? ?{

? ? ? ?if (context.ModelState.IsValid)

? ? ? ?{

? ? ? ? ? ?return;

? ? ? ?}

? ? ? ?var validationErrors = context.ModelState

? ? ? ? ? ?.Keys

? ? ? ? ? ?.SelectMany(k => context.ModelState[k].Errors)

? ? ? ? ? ?.Select(e => e.ErrorMessage)

? ? ? ? ? ?.ToArray();

? ? ? ?var json = new JsonErrorResponse

? ? ? ?{

? ? ? ? ? ?Messages = validationErrors

? ? ? ?};

? ? ? ?context.Result = new BadRequestObjectResult(json);

? ?}

}

services.AddSwaggerGen(options =>

{

? ?options.DescribeAllEnumsAsStrings();

? ?options.SwaggerDoc("v1", new Info

? ?{

? ? ? ?Title = "Basket HTTP API",

? ? ? ?Version = "v1",

? ? ? ?Description = "The Basket Service HTTP API",

? ? ? ?TermsOfService = "Terms Of Service"

? ?});

? ?options.AddSecurityDefinition("oauth2", new OAuth2Scheme

? ?{

? ? ? ?Type = "oauth2",

? ? ? ?Flow = "implicit",

? ? ? ?AuthorizationUrl = $"{Configuration.GetValue<string>("IdentityUrlExternal")}/connect/authorize",

? ? ? ?TokenUrl = $"{Configuration.GetValue<string>("IdentityUrlExternal")}/connect/token",

? ? ? ?Scopes = new Dictionary<string, string>()

? ? ? ?{

? ? ? ? ? ?{ "basket", "Basket API" }

? ? ? ?}

? ?});

? ?options.OperationFilter<AuthorizeCheckOperationFilter>();

});

public class AuthorizeCheckOperationFilter : IOperationFilter

{

? ?public void Apply(Operation operation, OperationFilterContext context)

? ?{

? ? ? ?// Check for authorize attribute

? ? ? ?var hasAuthorize = context.ApiDescription.ControllerAttributes().OfType<AuthorizeAttribute>().Any() ||

? ? ? ? ? ? ? ? ? ? ? ? ? context.ApiDescription.ActionAttributes().OfType<AuthorizeAttribute>().Any();

? ? ? ?if (hasAuthorize)

? ? ? ?{

? ? ? ? ? ?operation.Responses.Add("401", new Response { Description = "Unauthorized" });

? ? ? ? ? ?operation.Responses.Add("403", new Response { Description = "Forbidden" });

? ? ? ? ? ?operation.Security = new List<IDictionary<string, IEnumerable<string>>>();

? ? ? ? ? ?operation.Security.Add(new Dictionary<string, IEnumerable<string>>

? ? ? ? ? ?{

? ? ? ? ? ? ? ?{ "oauth2", new [] { "basketapi" } }

? ? ? ? ? ?});

? ? ? ?}

? ?}

}