4. abp中的asp.net core模块剖析

相关模块
  1. AbpAspNetCoreModule
  2. AbpAspNetCoreMvcModule
  3. AbpAspNetCoreMvcContractsModule

abp通过这三个模块加载并配置了 asp.net core。,最主要的就是AbpAspNetCoreMvcModule模块类,abp如何基于aspnet core构建自己的控制器和AppServices,就是在这个类中。

  • AbpAspNetCoreMvcModule
    将AbpAspNetCoreMvcConventionalRegister类添加到ConventionalRegistrarList列表中,该类主要是用来注入依赖及获取服务生命周期的。

      public override void PreConfigureServices(ServiceConfigurationContext context)
      {
          context.Services.AddConventionalRegistrar(new AbpAspNetCoreMvcConventionalRegistrar());
      }

    接下来就是重点,在ConfigureServices方法中配置视图和控制器,当然是基于 asp.net core mvc。首先配置Razor:

      context.Services.Insert(0,
          ServiceDescriptor.Singleton<IConfigureOptions<RazorViewEngineOptions>>(
              new ConfigureOptions<RazorViewEngineOptions>(options =>
                  {
                      options.FileProviders.Add(
                          new RazorViewEngineVirtualFileProvider(
                              context.Services.GetSingletonInstance<IObjectAccessor<IServiceProvider>>()
                          )
                      );
                  }
              )
          )
      );
    

    配置Api描述符:

      Configure<ApiDescriptionModelOptions>(options =>
      {
          options.IgnoredInterfaces.AddIfNotContains(typeof(IAsyncActionFilter));
          options.IgnoredInterfaces.AddIfNotContains(typeof(IFilterMetadata));
          options.IgnoredInterfaces.AddIfNotContains(typeof(IActionFilter));
      });

    可以看到 aspnetcore mvc中的过滤器接口,我们将其添加到了Api描述模型选项类中。下面就是注入MVC:

      var mvcCoreBuilder = context.Services.AddMvcCore();
      var mvcBuilder = context.Services.AddMvc()
          .AddDataAnnotationsLocalization(options =>
          {
              options.DataAnnotationLocalizerProvider = (type, factory) =>
              {
                  var resourceType = abpMvcDataAnnotationsLocalizationOptions.AssemblyResources.GetOrDefault(type.Assembly);
                  return factory.Create(resourceType ?? type);
              };
          })
          .AddViewLocalization();

    使用DI创建控制器,使用的是aspnet core默认的控制器激活器ServiceBasedControllerActivator类:

      //Use DI to create controllers
      context.Services.Replace(ServiceDescriptor.Transient<IControllerActivator, ServiceBasedControllerActivator>());

    abp提供了一个基于约定的控制器特性提供器类,这个类是基于 aspnetcore mvc的ControllerFeatureProvider构建自己的控制器,并检索判断控制器。

      //Add feature providers
      var partManager = context.Services.GetSingletonInstance<ApplicationPartManager>();
      var application = context.Services.GetSingletonInstance<IAbpApplication>();
    
      partManager.FeatureProviders.Add(new AbpConventionalControllerFeatureProvider(application));

    该类源码:

      public class AbpConventionalControllerFeatureProvider : ControllerFeatureProvider
      {
          private readonly IAbpApplication _application;
    
          public AbpConventionalControllerFeatureProvider(IAbpApplication application)
          {
              _application = application;
          }
    
          protected override bool IsController(TypeInfo typeInfo)
          {
              //TODO: Move this to a lazy loaded field for efficiency.
              if (_application.ServiceProvider == null)
              {
                  return false;
              }
    
              var configuration = _application.ServiceProvider
                  .GetRequiredService<IOptions<AbpAspNetCoreMvcOptions>>().Value
                  .ConventionalControllers
                  .ConventionalControllerSettings
                  .GetSettingOrNull(typeInfo.AsType());
    
              return configuration != null;
          }
      }

    由上,abp会基于aspnetcore mvc配置abp的mvc模块,特别是Controller的创建。从代码里面可以看出获取到AbpAspNetCoreMvcOptions的服务再去检索规约的控制器。由此返回是否是控制器。AbpAspNetCoreMvcOptions类是Abp对aspnet core mvc的一个封装,源码如下:

      public class AbpAspNetCoreMvcOptions
      {
          public ConventionalControllerOptions ConventionalControllers { get; }
    
          public AbpAspNetCoreMvcOptions()
          {
              ConventionalControllers = new ConventionalControllerOptions();
          }
      }
    
      //规约控制器集合
      public class ConventionalControllerOptions
      {
          public ConventionalControllerSettingList ConventionalControllerSettings { get; }
    
          public List<Type> FormBodyBindingIgnoredTypes { get; }
    
          public ConventionalControllerOptions()
          {
              ConventionalControllerSettings = new ConventionalControllerSettingList();
    
              FormBodyBindingIgnoredTypes = new List<Type>
              {
                  typeof(IFormFile)
              };
          }
    
          public ConventionalControllerOptions Create(Assembly assembly, [CanBeNull] Action<ConventionalControllerSetting> optionsAction = null)
          {
              var setting = new ConventionalControllerSetting(assembly, ModuleApiDescriptionModel.DefaultRootPath); // DefaultRootPath = app,abp路由就是以这个app开头的。
              optionsAction?.Invoke(setting);
              setting.Initialize();
              ConventionalControllerSettings.Add(setting);
              return this;
          }
      }

    AbpAspNetCoreMvcOptions实际上是通过ConventionalControllerOptions来完成规约的配置,来实现自定义的路由以及动态API。

  • AspNetCoreDescriptionModelProvider

    abp是如何aspnet core创建自己的API的呢?有这么一个类AspNetCoreDescriptionModelProvider,这个类就是提供了aspnet core的描述模型,源码如下:

      public class AspNetCoreApiDescriptionModelProvider : IApiDescriptionModelProvider, ITransientDependency
      {
          public ILogger<AspNetCoreApiDescriptionModelProvider> Logger { get; set; }
    
          private readonly IApiDescriptionGroupCollectionProvider _descriptionProvider;
          private readonly AbpAspNetCoreMvcOptions _options;
          private readonly ApiDescriptionModelOptions _modelOptions;
    
          public AspNetCoreApiDescriptionModelProvider(
              IApiDescriptionGroupCollectionProvider descriptionProvider,
              IOptions<AbpAspNetCoreMvcOptions> options,
              IOptions<ApiDescriptionModelOptions> modelOptions)
          {
              _descriptionProvider = descriptionProvider;
              _options = options.Value;
              _modelOptions = modelOptions.Value;
    
              Logger = NullLogger<AspNetCoreApiDescriptionModelProvider>.Instance;
          }
    
          public ApplicationApiDescriptionModel CreateApiModel()
          {
              //TODO: Can cache the model?
    
              var model = ApplicationApiDescriptionModel.Create();
    
              foreach (var descriptionGroupItem in _descriptionProvider.ApiDescriptionGroups.Items)
              {
                  foreach (var apiDescription in descriptionGroupItem.Items)
                  {
                      if (!apiDescription.ActionDescriptor.IsControllerAction())
                      {
                          continue;
                      }
    
                      AddApiDescriptionToModel(apiDescription, model);
                  }
              }
    
              return model;
          }
    
          private void AddApiDescriptionToModel(ApiDescription apiDescription, ApplicationApiDescriptionModel model)
          {
              var controllerType = apiDescription.ActionDescriptor.AsControllerActionDescriptor().ControllerTypeInfo.AsType();
              var setting = FindSetting(controllerType);
    
              var moduleModel = model.GetOrAddModule(GetRootPath(controllerType, setting));
    
              var controllerModel = moduleModel.GetOrAddController(controllerType.FullName, CalculateControllerName(controllerType, setting), controllerType, _modelOptions.IgnoredInterfaces);
    
              var method = apiDescription.ActionDescriptor.GetMethodInfo();
    
              var uniqueMethodName = GetUniqueActionName(method);
              if (controllerModel.Actions.ContainsKey(uniqueMethodName))
              {
                  Logger.LogWarning($"Controller '{controllerModel.ControllerName}' contains more than one action with name '{uniqueMethodName}' for module '{moduleModel.RootPath}'. Ignored: " + method);
                  return;
              }
    
              Logger.LogDebug($"ActionApiDescriptionModel.Create: {controllerModel.ControllerName}.{uniqueMethodName}");
              var actionModel = controllerModel.AddAction(uniqueMethodName, ActionApiDescriptionModel.Create(
                  uniqueMethodName,
                  method,
                  apiDescription.RelativePath,
                  apiDescription.HttpMethod,
                  GetSupportedVersions(controllerType, method, setting)
              ));
    
              AddParameterDescriptionsToModel(actionModel, method, apiDescription);
          }
    
          private static string CalculateControllerName(Type controllerType, ConventionalControllerSetting setting)
          {
              var controllerName = controllerType.Name.RemovePostFix("Controller").RemovePostFix(ApplicationService.CommonPostfixes);
    
              if (setting?.UrlControllerNameNormalizer != null)
              {
                  controllerName = setting.UrlControllerNameNormalizer(new UrlControllerNameNormalizerContext(setting.RootPath, controllerName));
              }
    
              return controllerName;
          }
      }

    这个类为我们提供了从Action到Controller的描述,构建了abp自己的api。它的调用有两个地方,一个是AbpApiDefinitionController,一个是ProxyScriptManager,前者是定义Abp的api控制器定义的地方,后者则是生成代理脚本的地方,abp的示例项目BookStore中会调用接口Abp/ServiceProxyScript生成一个js文件,这个js文件里面就是api的url地址,前端通过访问这个api地址来访问appservice等后端方法。源码如下:

      [Area("Abp")]
      [Route("Abp/ServiceProxyScript")]
      [DisableAuditing]
      public class AbpServiceProxyScriptController : AbpController
      {
          private readonly IProxyScriptManager _proxyScriptManager;
    
          public AbpServiceProxyScriptController(IProxyScriptManager proxyScriptManager)
          {
              _proxyScriptManager = proxyScriptManager;
          }
    
          [HttpGet]
          [Produces("text/javascript", "text/plain")]
          public string GetAll(ServiceProxyGenerationModel model)
          {
              model.Normalize();
              return _proxyScriptManager.GetScript(model.CreateOptions());
          }
      }
  • AbpHttpModule模块
    Abp创建jquery代理脚本生成器,主要用来生产api提供给前端访问

      public override void ConfigureServices(ServiceConfigurationContext context)
      {
          Configure<AbpApiProxyScriptingOptions>(options =>
          {
              options.Generators[JQueryProxyScriptGenerator.Name] = typeof(JQueryProxyScriptGenerator);
          });
      }
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