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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Components.Endpoints.Forms;
using Microsoft.AspNetCore.Components.Endpoints.Tests.TestComponents;
using Microsoft.AspNetCore.Components.Forms;
using Microsoft.AspNetCore.Components.Infrastructure;
using Microsoft.AspNetCore.Components.Routing;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Internal;
using Moq;
namespace Microsoft.AspNetCore.Components.Endpoints;
public class RazorComponentResultTest
{
[Fact]
public void RejectsNullParameters()
{
Assert.Throws<ArgumentNullException>(() => new RazorComponentResult(typeof(SimpleComponent), (object)null));
Assert.Throws<ArgumentNullException>(() => new RazorComponentResult(typeof(SimpleComponent), null));
}
[Fact]
public void AcceptsDictionaryParameters()
{
var paramsDict = new Dictionary<string, object> { { "First", 123 } };
var result = new RazorComponentResult(typeof(SimpleComponent), paramsDict);
Assert.Equal(1, result.Parameters.Count);
Assert.Equal(123, result.Parameters["First"]);
Assert.Same(paramsDict, result.Parameters);
}
[Fact]
public void AcceptsObjectParameters()
{
var result = new RazorComponentResult(typeof(SimpleComponent), new { Param1 = 123, Param2 = "Another" });
Assert.Equal(2, result.Parameters.Count);
Assert.Equal(123, result.Parameters["Param1"]);
Assert.Equal("Another", result.Parameters["Param2"]);
}
[Fact]
public async Task CanRenderComponentStatically()
{
// Arrange
var result = new RazorComponentResult<SimpleComponent>();
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act
await result.ExecuteAsync(httpContext);
// Assert
Assert.Equal("<h1>Hello from SimpleComponent</h1>", GetStringContent(responseBody));
Assert.Equal("text/html; charset=utf-8", httpContext.Response.ContentType);
Assert.Equal(200, httpContext.Response.StatusCode);
}
[Fact]
public async Task ResponseIncludesStatusCodeAndContentTypeAndHtml()
{
// Arrange
var result = new RazorComponentResult<SimpleComponent>
{
StatusCode = 123,
ContentType = "application/test-content-type",
};
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act
await result.ExecuteAsync(httpContext);
// Assert
Assert.Equal("<h1>Hello from SimpleComponent</h1>", GetStringContent(responseBody));
Assert.Equal("application/test-content-type", httpContext.Response.ContentType);
Assert.Equal(123, httpContext.Response.StatusCode);
}
[Fact]
public async Task PerformsStreamingRendering()
{
// Arrange
var tcs = new TaskCompletionSource();
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act/Assert 1: Emits the initial pre-quiescent output to the response
var result = new RazorComponentResult(typeof(StreamingAsyncLoadingComponent),
PropertyHelper.ObjectToDictionary(new { LoadingTask = tcs.Task }).AsReadOnly());
var completionTask = result.ExecuteAsync(httpContext);
await WaitForContentWrittenAsync(responseBody);
Assert.Equal(
"<!--bl:X-->Loading task status: WaitingForActivation<!--/bl:X-->",
MaskComponentIds(GetStringContent(responseBody)));
// Assert 2: Result task remains incomplete for as long as the component's loading operation remains in flight
// This keeps the HTTP response open
await Task.Yield();
Assert.False(completionTask.IsCompleted);
// Act/Assert 3: When loading completes, it emits a streaming batch update and completes the response
tcs.SetResult();
await completionTask;
Assert.Equal(
"<!--bl:X-->Loading task status: WaitingForActivation<!--/bl:X--><blazor-ssr><template blazor-component-id=\"X\">Loading task status: RanToCompletion</template><blazor-ssr-end></blazor-ssr-end></blazor-ssr>",
MaskComponentIds(GetStringContent(responseBody)));
}
[Fact]
public async Task EmitsEachComponentOnlyOncePerStreamingUpdate_WhenAComponentRendersTwice()
{
// Arrange
var tcs = new TaskCompletionSource();
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act/Assert 1: Emits the initial pre-quiescent output to the response
var result = new RazorComponentResult(typeof(DoubleRenderingStreamingAsyncComponent),
PropertyHelper.ObjectToDictionary(new { WaitFor = tcs.Task }).AsReadOnly());
var completionTask = result.ExecuteAsync(httpContext);
await WaitForContentWrittenAsync(responseBody);
Assert.Equal(
"<!--bl:X-->Loading...<!--/bl:X-->",
MaskComponentIds(GetStringContent(responseBody)));
// Act/Assert 2: When loading completes, it emits a streaming batch update with only one copy of the final output,
// despite the RenderBatch containing two diffs from the component
tcs.SetResult();
await completionTask;
Assert.Equal(
"<!--bl:X-->Loading...<!--/bl:X--><blazor-ssr><template blazor-component-id=\"X\">Loaded</template><blazor-ssr-end></blazor-ssr-end></blazor-ssr>",
MaskComponentIds(GetStringContent(responseBody)));
}
[Fact]
public async Task EmitsEachComponentOnlyOncePerStreamingUpdate_WhenAnAncestorAlsoUpdated()
{
// Since the HTML rendered for each component also includes all its descendants, we don't
// want to render output for any component that also has an ancestor in the set of updates
// (as it would then be output twice)
// Arrange
var tcs = new TaskCompletionSource();
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act/Assert 1: Emits the initial pre-quiescent output to the response
var result = new RazorComponentResult(typeof(StreamingComponentWithChild),
PropertyHelper.ObjectToDictionary(new { LoadingTask = tcs.Task }).AsReadOnly());
var completionTask = result.ExecuteAsync(httpContext);
await WaitForContentWrittenAsync(responseBody);
var expectedInitialHtml = "<!--bl:X-->[LoadingTask: WaitingForActivation]\n<!--bl:X-->[Child render: 1]\n<!--/bl:X--><!--/bl:X-->";
Assert.Equal(
expectedInitialHtml,
MaskComponentIds(GetStringContent(responseBody)));
// Act/Assert 2: When loading completes, it emits a streaming batch update in which the
// child is present only within the parent markup, not as a separate entry
tcs.SetResult();
await completionTask;
Assert.Equal(
$"{expectedInitialHtml}<blazor-ssr><template blazor-component-id=\"X\">[LoadingTask: RanToCompletion]\n<!--bl:X-->[Child render: 2]\n<!--/bl:X--></template><blazor-ssr-end></blazor-ssr-end></blazor-ssr>",
MaskComponentIds(GetStringContent(responseBody)));
}
[Fact]
public async Task WaitsForQuiescenceIfPreventStreamingRenderingIsTrue()
{
// Arrange
var tcs = new TaskCompletionSource();
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act/Assert: Doesn't complete until loading finishes
var result = new RazorComponentResult(typeof(StreamingAsyncLoadingComponent),
PropertyHelper.ObjectToDictionary(new { LoadingTask = tcs.Task }).AsReadOnly())
{
PreventStreamingRendering = true
};
var completionTask = result.ExecuteAsync(httpContext);
await Task.Yield();
Assert.False(completionTask.IsCompleted);
// Act/Assert: Does complete when loading finishes
tcs.SetResult();
await completionTask;
Assert.Equal(
"<!--bl:X-->Loading task status: RanToCompletion<!--/bl:X-->",
MaskComponentIds(GetStringContent(responseBody)));
}
[Fact]
public async Task SupportsLayouts()
{
// Arrange
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act
await new RazorComponentResult(typeof(ComponentWithLayout)).ExecuteAsync(httpContext);
// Assert
Assert.Equal($"[TestParentLayout with content: [TestLayout with content: Page\n]\n]\n", GetStringContent(responseBody));
}
[Fact]
public async Task OnNavigationBeforeResponseStarted_Redirects()
{
// Arrange
var httpContext = GetTestHttpContext();
// Act
await new RazorComponentResult(typeof(ComponentThatRedirectsSynchronously)).ExecuteAsync(httpContext);
// Assert
Assert.Equal("https://test/somewhere/else", httpContext.Response.Headers.Location);
}
[Fact]
public async Task OnNavigationAfterResponseStarted_WithStreamingOff_Throws()
{
// Arrange
var httpContext = GetTestHttpContext();
var responseMock = new Mock<IHttpResponseFeature>();
responseMock.Setup(r => r.HasStarted).Returns(true);
responseMock.Setup(r => r.Headers).Returns(new HeaderDictionary());
httpContext.Features.Set(responseMock.Object);
// Act
var result = new RazorComponentResult(typeof(StreamingComponentThatRedirectsAsynchronously))
{
PreventStreamingRendering = true
};
var ex = await Assert.ThrowsAsync<InvalidOperationException>(
() => result.ExecuteAsync(httpContext));
// Assert
Assert.Contains("A navigation command was attempted during prerendering after the server already started sending the response", ex.Message);
}
[Fact]
public async Task OnNavigationAfterResponseStarted_WithStreamingOn_EmitsCommand()
{
// Arrange
var httpContext = GetTestHttpContext();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
// Act
await new RazorComponentResult(typeof(StreamingComponentThatRedirectsAsynchronously)).ExecuteAsync(httpContext);
// Assert
var markup = MaskComponentIds(GetStringContent(responseBody));
Assert.StartsWith(
"<!--bl:X-->Some output\n<!--/bl:X--><blazor-ssr><template type=\"redirection\">_framework/opaque-redirect?url=",
markup);
Assert.EndsWith(
"</template><blazor-ssr-end></blazor-ssr-end></blazor-ssr>",
markup);
}
[Fact]
public async Task OnUnhandledExceptionBeforeResponseStarted_Throws()
{
// Arrange
var httpContext = GetTestHttpContext();
// Act
var ex = await Assert.ThrowsAsync<InvalidTimeZoneException>(() =>
new RazorComponentResult(typeof(ComponentThatThrowsSynchronously)).ExecuteAsync(httpContext));
// Assert
Assert.Contains("Test message", ex.Message);
}
[Fact]
public async Task OnUnhandledExceptionAfterResponseStarted_WithStreamingOff_Throws()
{
// Arrange
var httpContext = GetTestHttpContext();
// Act
var ex = await Assert.ThrowsAsync<InvalidTimeZoneException>(
() => new RazorComponentResult(typeof(StreamingComponentThatThrowsAsynchronously)) { PreventStreamingRendering = true }
.ExecuteAsync(httpContext));
// Assert
Assert.Contains("Test message", ex.Message);
}
[Theory]
[InlineData(false)]
[InlineData(true)]
public async Task OnUnhandledExceptionAfterResponseStarted_WithStreamingOn_EmitsCommand(bool isDevelopmentEnvironment)
{
// Arrange
var httpContext = GetTestHttpContext(isDevelopmentEnvironment ? Environments.Development : Environments.Production);
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
var expectedResponseExceptionInfo = isDevelopmentEnvironment
? "System.InvalidTimeZoneException: Test message with <b>markup</b>"
: "There was an unhandled exception on the current request. For more details turn on detailed exceptions by setting 'DetailedErrors: true' in 'appSettings.Development.json'";
// Act
var ex = await Assert.ThrowsAsync<InvalidTimeZoneException>(
() => new RazorComponentResult(typeof(StreamingComponentThatThrowsAsynchronously))
.ExecuteAsync(httpContext));
// Assert
Assert.Contains("Test message with <b>markup</b>", ex.Message);
Assert.Contains(
$"<!--bl:X-->Some output\n<!--/bl:X--><blazor-ssr><template type=\"error\">{expectedResponseExceptionInfo}",
MaskComponentIds(GetStringContent(responseBody)));
}
[Fact]
public async Task StreamingRendering_IsOffByDefault_AndCanBeEnabledForSubtree()
{
// Arrange
var testContext = PrepareVaryStreamingScenariosTests();
var initialOutputTask = testContext.Renderer.NonStreamingPendingTasksCompletion;
// Act/Assert: Even if all other blocking tasks complete, we don't produce output until the top-level
// nonstreaming component completes
Assert.NotNull(initialOutputTask);
testContext.WithinNestedNonstreamingRegionTask.SetResult();
await Task.Yield(); // Just to show it's still not completed after
Assert.False(initialOutputTask.IsCompleted);
// Act/Assert: Produce initial output, noting absence of streaming markers at top level
testContext.TopLevelComponentTask.SetResult();
await initialOutputTask;
await WaitForContentWrittenAsync(testContext.ResponseBody);
var html = MaskComponentIds(GetStringContent(testContext.ResponseBody));
Assert.StartsWith("[Top level component: Loaded]", html);
Assert.Contains("[Within streaming region: <!--bl:X-->Loading...<!--/bl:X-->]", html);
Assert.Contains("[Within nested nonstreaming region: Loaded]", html);
Assert.DoesNotContain("blazor-ssr", html);
// Act/Assert: Complete the streaming
testContext.WithinStreamingRegionTask.SetResult();
await testContext.Quiescence;
html = GetStringContent(testContext.ResponseBody);
Assert.EndsWith(
"<blazor-ssr><template blazor-component-id=\"X\">Loaded</template><blazor-ssr-end></blazor-ssr-end></blazor-ssr>",
MaskComponentIds(html));
}
[Fact]
public async Task StreamingRendering_CanBeDisabledForSubtree()
{
// Arrange
var testContext = PrepareVaryStreamingScenariosTests();
var initialOutputTask = testContext.Renderer.NonStreamingPendingTasksCompletion;
// Act/Assert: Even if all other nonblocking tasks complete, we don't produce output until
// the component in the nonstreaming subtree is quiescent
Assert.NotNull(initialOutputTask);
testContext.TopLevelComponentTask.SetResult();
await Task.Yield(); // Just to show it's still not completed after
Assert.False(initialOutputTask.IsCompleted);
// Act/Assert: Does produce output when nonstreaming subtree is quiescent
testContext.WithinNestedNonstreamingRegionTask.SetResult();
await initialOutputTask;
await WaitForContentWrittenAsync(testContext.ResponseBody);
var html = MaskComponentIds(GetStringContent(testContext.ResponseBody));
Assert.Contains("[Within streaming region: <!--bl:X-->Loading...<!--/bl:X-->]", html);
Assert.DoesNotContain("blazor-ssr", html);
// Assert: No boundary markers around nonstreaming components, even if they are nested in a streaming region
Assert.Contains("[Top level component: Loaded]", html);
Assert.Contains("[Within nested nonstreaming region: Loaded]", html);
// Act/Assert: Complete the streaming
testContext.WithinStreamingRegionTask.SetResult();
await testContext.Quiescence;
html = GetStringContent(testContext.ResponseBody);
Assert.EndsWith(
"<blazor-ssr><template blazor-component-id=\"X\">Loaded</template><blazor-ssr-end></blazor-ssr-end></blazor-ssr>",
MaskComponentIds(html));
}
// We don't want these tests to be hardcoded for specific component ID numbers, so replace them all with X for assertions
private static readonly Regex TemplateElementComponentIdRegex = new Regex("blazor-component-id=\"\\d+\"");
private static readonly Regex OpenBoundaryMarkerRegex = new Regex("<!--bl:\\d+-->");
private static readonly Regex CloseBoundaryMarkerRegex = new Regex("<!--/bl:\\d+-->");
private static string MaskComponentIds(string html)
{
html = TemplateElementComponentIdRegex.Replace(html, "blazor-component-id=\"X\"");
html = OpenBoundaryMarkerRegex.Replace(html, "<!--bl:X-->");
html = CloseBoundaryMarkerRegex.Replace(html, "<!--/bl:X-->");
return html;
}
private VaryStreamingScenariosContext PrepareVaryStreamingScenariosTests()
{
var httpContext = GetTestHttpContext();
var renderer = httpContext.RequestServices.GetRequiredService<EndpointHtmlRenderer>();
var responseBody = new MemoryStream();
httpContext.Response.Body = responseBody;
var topLevelComponentTask = new TaskCompletionSource();
var withinStreamingRegionTask = new TaskCompletionSource();
var withinNestedNonstreamingRegionTask = new TaskCompletionSource();
var parameters = new Dictionary<string, object>
{
{ nameof(VaryStreamingScenarios.TopLevelComponentTask), topLevelComponentTask.Task },
{ nameof(VaryStreamingScenarios.WithinStreamingRegionTask), withinStreamingRegionTask.Task },
{ nameof(VaryStreamingScenarios.WithinNestedNonstreamingRegionTask), withinNestedNonstreamingRegionTask.Task },
};
var result = new RazorComponentResult(typeof(VaryStreamingScenarios), parameters);
var quiescence = result.ExecuteAsync(httpContext);
return new(renderer, quiescence, responseBody, topLevelComponentTask, withinStreamingRegionTask, withinNestedNonstreamingRegionTask);
}
private record struct VaryStreamingScenariosContext(
EndpointHtmlRenderer Renderer,
Task Quiescence,
MemoryStream ResponseBody,
TaskCompletionSource TopLevelComponentTask,
TaskCompletionSource WithinStreamingRegionTask,
TaskCompletionSource WithinNestedNonstreamingRegionTask);
private static string GetStringContent(MemoryStream stream)
{
stream.Position = 0;
return new StreamReader(stream).ReadToEnd().Replace("\r\n", "\n");
}
public static DefaultHttpContext GetTestHttpContext(string environmentName = null)
{
var mockWebHostEnvironment = Mock.Of<IWebHostEnvironment>(
x => x.EnvironmentName == (environmentName ?? Environments.Production));
var serviceCollection = new ServiceCollection()
.AddAntiforgery()
.AddSingleton(new DiagnosticListener("test"))
.AddSingleton<IWebHostEnvironment>(mockWebHostEnvironment)
.AddSingleton<EndpointHtmlRenderer>()
.AddSingleton<IComponentPrerenderer>(services => services.GetRequiredService<EndpointHtmlRenderer>())
.AddSingleton<NavigationManager, FakeNavigationManager>()
.AddSingleton<ServerComponentSerializer>()
.AddSingleton<ComponentStatePersistenceManager>()
.AddSingleton<IDataProtectionProvider, FakeDataProtectionProvider>()
.AddSingleton<HttpContextFormDataProvider>()
.AddSingleton<ComponentStatePersistenceManager>()
.AddSingleton<PersistentComponentState>(sp => sp.GetRequiredService<ComponentStatePersistenceManager>().State)
.AddSingleton<AntiforgeryStateProvider, EndpointAntiforgeryStateProvider>()
.AddLogging();
var result = new DefaultHttpContext { RequestServices = serviceCollection.BuildServiceProvider() };
result.Request.Scheme = "https";
result.Request.Host = new HostString("test");
return result;
}
// Some tests want to observe the output state when some content has been written, but without waiting for
// the whole streaming task to complete. There isn't any public API that exposes this specific phase, so
// rather than making the renderer track additional tasks that would only be used in tests, this allows the
// tests to continue once the first batch of output was written.
private static async Task WaitForContentWrittenAsync(Stream stream, TimeSpan? timeout = default)
{
var timeoutRemaining = timeout.GetValueOrDefault(TimeSpan.FromSeconds(1));
var pollInterval = TimeSpan.FromMilliseconds(50);
do
{
if (stream.Position > 0)
{
return;
}
await Task.Delay(pollInterval);
timeoutRemaining = timeoutRemaining - pollInterval;
} while (timeoutRemaining.TotalMilliseconds > 0);
Assert.Fail("Timeout elapsed without content being written");
}
class FakeDataProtectionProvider : IDataProtectionProvider
{
public IDataProtector CreateProtector(string purpose)
=> new FakeDataProtector();
class FakeDataProtector : IDataProtector
{
public IDataProtector CreateProtector(string purpose) => this;
public byte[] Protect(byte[] plaintext) => new byte[] { 1, 2, 3 };
public byte[] Unprotect(byte[] protectedData) => throw new NotImplementedException();
}
}
class FakeNavigationManager : NavigationManager, IHostEnvironmentNavigationManager
{
public new void Initialize(string baseUri, string uri)
=> base.Initialize(baseUri, uri);
protected override void NavigateToCore(string uri, NavigationOptions options)
{
// Equivalent to what RemoteNavigationManager would do
var absoluteUriString = ToAbsoluteUri(uri).AbsoluteUri;
throw new NavigationException(absoluteUriString);
}
}
}
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