public void NoFoundMiddlewareComponent_ThrowsException()
{
var serverBuilder = new TestServerBuilder <GraphSchema>(TestOptions.UseCodeDeclaredNames)
.AddGraphType <MiddlewareController>();
// do not setup an event handler on the pipeline builder, meaning no injection of the middleware component
// to the service provider (test server builder). The invoker will not be able to instantiate
// the requested middleware component for invocation and should throw an exception
var pipelineBuilder = new SchemaPipelineBuilder <GraphSchema, IGraphFieldExecutionMiddleware, GraphFieldExecutionContext>();
// a pipeline with one component
pipelineBuilder.AddMiddleware <TestMiddleware1>(ServiceLifetime.Singleton);
var pipeline = pipelineBuilder.Build();
Assert.IsNotNull(pipeline);
// fake a graph ql request context
var server = serverBuilder.Build();
var fieldBuilder = server.CreateFieldContextBuilder <MiddlewareController>(nameof(MiddlewareController.FieldOfData));
var executionContext = fieldBuilder.CreateExecutionContext();
// execute the pipeline, exception should be thrown
Assert.ThrowsAsync <GraphPipelineMiddlewareInvocationException>(
async() =>
{
await pipeline.InvokeAsync(executionContext, CancellationToken.None);
});
}
public async Task SingletonMiddlewareWithUserProvidedInstance_NeverAttemptsToCreateAnInstance()
{
var serverBuilder = new TestServerBuilder <GraphSchema>(TestOptions.UseCodeDeclaredNames)
.AddGraphType <MiddlewareController>();
var idsCalled = new List <string>();
var middlewareService = new Mock <IMiddlewareTestService>();
middlewareService.Setup(x => x.BeforeNext(It.IsAny <string>())).Callback(
(string idValue) => { idsCalled.Add(idValue); }).Verifiable();
serverBuilder.AddSingleton(middlewareService.Object);
// mock the calls that would be made through the primary builder to generate a fake pipeline
var pipelineBuilder = new SchemaPipelineBuilder <GraphSchema, IGraphFieldExecutionMiddleware, GraphFieldExecutionContext>();
pipelineBuilder.TypeReferenceAdded += this.CreateTypeAddHandler(serverBuilder);
// premake the singleton middleware component
var component = new TestMiddlewareSingleton(middlewareService.Object);
// inject the component into the pipeline as an item, not just a type reference
pipelineBuilder.AddMiddleware(component);
// make sure a delegate was created
var pipeline = pipelineBuilder.Build();
Assert.IsNotNull(pipeline);
var server = serverBuilder.Build();
var builder = server.CreateFieldContextBuilder <MiddlewareController>(nameof(MiddlewareController.FieldOfData));
// make an empty service collection (preventing creation if the middleware isnt found)
var sc = new ServiceCollection();
builder.ServiceProvider = sc.BuildServiceProvider();
// execute the pipeline multiple times
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
// ensure all methods that were expected to be called, were called
middlewareService.Verify(x => x.BeforeNext(It.IsAny <string>()), Times.Exactly(5));
// ensure that each time the middleware was called and an id saved off
// that hte Id never changed (it was never "newed up" more than once and the original object id was used each time)
Assert.AreEqual(5, idsCalled.Count);
foreach (var id in idsCalled)
{
Assert.AreEqual(component.Id, id);
}
}
public async Task SingletonMiddlewareComponent_IsNeverInstantiatedMoreThanOnce()
{
var serverBuilder = new TestServerBuilder <GraphSchema>(TestOptions.UseCodeDeclaredNames)
.AddGraphType <MiddlewareController>();
var idsCalled = new List <string>();
var middlewareService = new Mock <IMiddlewareTestService>();
middlewareService.Setup(x => x.BeforeNext(It.IsAny <string>())).Callback(
(string idValue) => { idsCalled.Add(idValue); }).Verifiable();
serverBuilder.AddSingleton(middlewareService.Object);
// mock the calls that would be made through the primary builder to generate a fake pipeline
var pipelineBuilder = new SchemaPipelineBuilder <GraphSchema, IGraphFieldExecutionMiddleware, GraphFieldExecutionContext>();
pipelineBuilder.TypeReferenceAdded += this.CreateTypeAddHandler(serverBuilder);
pipelineBuilder.AddMiddleware <TestMiddlewareSingleton>(ServiceLifetime.Singleton);
// make sure a delegate was created
var pipeline = pipelineBuilder.Build();
Assert.IsNotNull(pipeline);
Assert.AreEqual(2, serverBuilder.Count); // 1 middleware component + the service
// fake a graph ql request context
var server = serverBuilder.Build();
var builder = server.CreateFieldContextBuilder <MiddlewareController>(nameof(MiddlewareController.FieldOfData));
// execute the pipeline multiple times
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
await pipeline.InvokeAsync(builder.CreateExecutionContext(), CancellationToken.None);
// ensure all methods that were expected to be called, were called
middlewareService.Verify(x => x.BeforeNext(It.IsAny <string>()), Times.Exactly(5));
// ensure that each time the middleware was called and an id saved off
// that hte Id never changed (it was never "newed up" more than once)
Assert.AreEqual(5, idsCalled.Count);
var singleton = server.ServiceProvider.GetService <TestMiddlewareSingleton>();
foreach (var id in idsCalled)
{
Assert.AreEqual(singleton.Id, id);
}
}
public async Task MiddlewareComponentThrowsExceptions_MiddlewareInvokerShouldUnwrapAndThrowTheException()
{
var serverBuilder = new TestServerBuilder <GraphSchema>(TestOptions.UseCodeDeclaredNames)
.AddGraphType <MiddlewareController>();
// mock the calls that would be made through the primary builder to generate a fake pipeline
var pipelineBuilder = new SchemaPipelineBuilder <GraphSchema, IGraphFieldExecutionMiddleware, GraphFieldExecutionContext>();
pipelineBuilder.TypeReferenceAdded += this.CreateTypeAddHandler(serverBuilder);
// a pipeline with one component
pipelineBuilder.AddMiddleware <TestMiddlewareThrowsException>(ServiceLifetime.Singleton);
// make sure a delegate was created
var pipeline = pipelineBuilder.Build();
Assert.IsNotNull(pipeline);
// fake a graph ql request context
var server = serverBuilder.Build();
var builder = server.CreateFieldContextBuilder <MiddlewareController>(nameof(MiddlewareController.FieldOfData));
var context = builder.CreateExecutionContext();
// execute the pipeline, exception should be thrown by the middleware Component
try
{
await pipeline.InvokeAsync(context, CancellationToken.None);
}
catch (TestMiddlewareThrowsException.TestMiddlewareException)
{
Assert.IsTrue(true);
}
catch
{
Assert.Fail("Inner exception from the test was not thrown, a generic exception was thrown.");
}
}
public async Task SingularPipelineInvokesComponentsInOrder()
{
var serverBuilder = new TestServerBuilder <GraphSchema>(TestOptions.UseCodeDeclaredNames)
.AddGraphType <MiddlewareController>();
// setup a mock pipeline to verify that each middleware piece called into the service
// and that hte order of the invocation was in the order the pipeline was declared
var orderOfBeforeCalls = new List <string>();
var orderOfAfterCalls = new List <string>();
var middlewareService = new Mock <IMiddlewareTestService>();
middlewareService.Setup(x => x.AfterNext(It.IsAny <string>())).Callback(
(string name) => { orderOfAfterCalls.Add(name); }).Verifiable();
middlewareService.Setup(x => x.BeforeNext(It.IsAny <string>())).Callback(
(string name) => { orderOfBeforeCalls.Add(name); }).Verifiable();
// mock the calls that would be made through the primary builder to generate a fake pipeline
var pipelineBuilder = new SchemaPipelineBuilder <GraphSchema, IGraphFieldExecutionMiddleware, GraphFieldExecutionContext>();
pipelineBuilder.TypeReferenceAdded += this.CreateTypeAddHandler(serverBuilder);
pipelineBuilder.AddMiddleware <TestMiddleware1>(ServiceLifetime.Singleton);
pipelineBuilder.AddMiddleware <TestMiddleware2>(ServiceLifetime.Singleton);
pipelineBuilder.AddMiddleware <TestMiddleware3>(ServiceLifetime.Singleton);
// ensure types were added via the event
serverBuilder.AddSingleton(middlewareService.Object);
Assert.AreEqual(4, serverBuilder.Count); // 3 middleware components + the service
// create the pipleine
var pipeline = pipelineBuilder.Build();
Assert.IsNotNull(pipeline);
// fake a graph ql request context
var server = serverBuilder.Build();
var fieldBuilder = server.CreateFieldContextBuilder <MiddlewareController>(nameof(MiddlewareController.FieldOfData));
var executionContext = fieldBuilder.CreateExecutionContext();
// execute the pipeline
await pipeline.InvokeAsync(executionContext, CancellationToken.None);
// ensure all methods that were expected to be called, were called
middlewareService.Verify(x => x.BeforeNext(nameof(TestMiddleware1)), Times.Exactly(1));
middlewareService.Verify(x => x.AfterNext(nameof(TestMiddleware1)), Times.Exactly(1));
middlewareService.Verify(x => x.BeforeNext(nameof(TestMiddleware2)), Times.Exactly(1));
middlewareService.Verify(x => x.AfterNext(nameof(TestMiddleware2)), Times.Exactly(1));
middlewareService.Verify(x => x.BeforeNext(nameof(TestMiddleware3)), Times.Exactly(1));
middlewareService.Verify(x => x.AfterNext(nameof(TestMiddleware3)), Times.Exactly(1));
// ensure the invocation order was as expected
// in ccreated order for the "before calls"
Assert.AreEqual(3, orderOfBeforeCalls.Count);
Assert.AreEqual(nameof(TestMiddleware1), orderOfBeforeCalls[0]);
Assert.AreEqual(nameof(TestMiddleware2), orderOfBeforeCalls[1]);
Assert.AreEqual(nameof(TestMiddleware3), orderOfBeforeCalls[2]);
// in reverse order for the "after calls"
Assert.AreEqual(3, orderOfAfterCalls.Count);
Assert.AreEqual(nameof(TestMiddleware3), orderOfAfterCalls[0]);
Assert.AreEqual(nameof(TestMiddleware2), orderOfAfterCalls[1]);
Assert.AreEqual(nameof(TestMiddleware1), orderOfAfterCalls[2]);
}