public void ValidConfigure_DoesNotThrow()
{
// Arrange
var provider = new MiddlewareFilterConfigurationProvider();
// Act
var configureDelegate = MiddlewareFilterConfigurationProvider.CreateConfigureDelegate(typeof(ValidConfigure_WithNoEnvironment));
// Assert
Assert.NotNull(configureDelegate);
}
public void CreateConfigureDelegate_ThrowsIfTypeCannotBeInstantiated(Type configurationType)
{
// Arrange
var provider = new MiddlewareFilterConfigurationProvider();
// Act
var exception = Assert.Throws <InvalidOperationException>(() => MiddlewareFilterConfigurationProvider.CreateConfigureDelegate(configurationType));
// Assert
Assert.Equal($"Unable to create an instance of type '{configurationType}'. The type specified in configurationType must not be abstract and must have a parameterless constructor.", exception.Message);
}
private RequestDelegate BuildPipeline(Type middlewarePipelineProviderType)
{
if (ApplicationBuilder == null)
{
throw new InvalidOperationException(
Resources.FormatMiddlewareFilterBuilder_NullApplicationBuilder(nameof(ApplicationBuilder)));
}
var nestedAppBuilder = ApplicationBuilder.New();
// Get the 'Configure' method from the user provided type.
var configureDelegate = MiddlewareFilterConfigurationProvider.CreateConfigureDelegate(middlewarePipelineProviderType);
configureDelegate(nestedAppBuilder);
// The middleware resource filter, after receiving the request executes the user configured middleware
// pipeline. Since we want execution of the request to continue to later MVC layers (resource filters
// or model binding), add a middleware at the end of the user provided pipeline which make sure to continue
// this flow.
// Example:
// middleware filter -> user-middleware1 -> user-middleware2 -> end-middleware -> resource filters or model binding
nestedAppBuilder.Run(async(httpContext) =>
{
var feature = httpContext.Features.Get <IMiddlewareFilterFeature>();
if (feature == null)
{
throw new InvalidOperationException(
Resources.FormatMiddlewareFilterBuilder_NoMiddlewareFeature(nameof(IMiddlewareFilterFeature)));
}
var resourceExecutionDelegate = feature.ResourceExecutionDelegate !;
var resourceExecutedContext = await resourceExecutionDelegate();
if (resourceExecutedContext.ExceptionHandled)
{
return;
}
// Ideally we want the experience of a middleware pipeline to behave the same as if it was registered
// in Startup. In this scenario, an Exception thrown in a middleware later in the pipeline gets
// propagated back to earlier middleware. So, check if a later resource filter threw an Exception and
// propagate that back to the middleware pipeline.
resourceExecutedContext.ExceptionDispatchInfo?.Throw();
if (resourceExecutedContext.Exception != null)
{
// This line is rarely reachable because ResourceInvoker captures thrown Exceptions using
// ExceptionDispatchInfo. That said, filters could set only resourceExecutedContext.Exception.
throw resourceExecutedContext.Exception;
}
});
return(nestedAppBuilder.Build());
}
public void InvalidType_NoPublicConfigure_Throws()
{
// Arrange
var type = typeof(InvalidType_NoPublic_Configure);
var provider = new MiddlewareFilterConfigurationProvider();
var expected = $"A public method named 'Configure' could not be found in the '{type.FullName}' type.";
// Act & Assert
var exception = Assert.Throws <InvalidOperationException>(() =>
{
MiddlewareFilterConfigurationProvider.CreateConfigureDelegate(type);
});
Assert.Equal(expected, exception.Message);
}
public void ValidConfigure_AndAdditionalServices_DoesNotThrow()
{
// Arrange
var loggerFactory = Mock.Of <ILoggerFactory>();
var services = new ServiceCollection();
services.AddSingleton(loggerFactory);
services.AddSingleton(Mock.Of <IWebHostEnvironment>());
var applicationBuilder = GetApplicationBuilder(services);
var provider = new MiddlewareFilterConfigurationProvider();
// Act
var configureDelegate = MiddlewareFilterConfigurationProvider.CreateConfigureDelegate(typeof(ValidConfigure_WithNoEnvironment_AdditionalServices));
// Assert
Assert.NotNull(configureDelegate);
}
public MiddlewareFilterBuilder(MiddlewareFilterConfigurationProvider configurationProvider)
{
_configurationProvider = configurationProvider;
}
