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HTTP/3 & QUIC: fix abort read on dispose and cancellation (#55724)
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Fix abort on cancellation for HTTP/3 content stream, fix dispose when read was aborted by cancellation token.
Fixes #48624
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@CarnaViire
CarnaViire authored Jul 20, 2021
1 parent b835c8c commit 978b0db
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Showing 5 changed files with 206 additions and 7 deletions.
9 changes: 5 additions & 4 deletions src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/Http3RequestStream.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -102,8 +102,6 @@ public async ValueTask DisposeAsync()
private void DisposeSyncHelper()
{
_connection.RemoveStream(_stream);
_connection = null!;
_stream = null!;

_sendBuffer.Dispose();
_recvBuffer.Dispose();
Expand Down Expand Up @@ -1107,7 +1105,10 @@ private void HandleReadResponseContentException(Exception ex, CancellationToken
{
switch (ex)
{
// Peer aborted the stream
case QuicStreamAbortedException _:
// User aborted the stream
case QuicOperationAbortedException _:
throw new IOException(SR.net_http_client_execution_error, new HttpRequestException(SR.net_http_client_execution_error, ex));
case QuicConnectionAbortedException _:
// Our connection was reset. Start aborting the connection.
Expand All @@ -1118,11 +1119,11 @@ private void HandleReadResponseContentException(Exception ex, CancellationToken
_connection.Abort(ex);
throw new IOException(SR.net_http_client_execution_error, new HttpRequestException(SR.net_http_client_execution_error, ex));
case OperationCanceledException oce when oce.CancellationToken == cancellationToken:
_stream.AbortWrite((long)Http3ErrorCode.RequestCancelled);
_stream.AbortRead((long)Http3ErrorCode.RequestCancelled);
ExceptionDispatchInfo.Throw(ex); // Rethrow.
return; // Never reached.
default:
_stream.AbortWrite((long)Http3ErrorCode.InternalError);
_stream.AbortRead((long)Http3ErrorCode.InternalError);
throw new IOException(SR.net_http_client_execution_error, new HttpRequestException(SR.net_http_client_execution_error, ex));
}
}
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6 changes: 6 additions & 0 deletions src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Headers.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,12 @@ await LoopbackServerFactory.CreateClientAndServerAsync(async uri =>
[InlineData("RandomCustomHeader", 12345)]
public async Task GetAsync_LargeHeader_Success(string headerName, int headerValueLength)
{
if (UseVersion == HttpVersion.Version30)
{
// [ActiveIssue("https://github.com/dotnet/runtime/issues/55508")]
return;
}

var rand = new Random(42);
string headerValue = string.Concat(Enumerable.Range(0, headerValueLength).Select(_ => (char)('A' + rand.Next(26))));

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180 changes: 180 additions & 0 deletions src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -445,6 +445,186 @@ public async Task Public_Interop_Upgrade_Success(string uri)
}
}

public enum CancellationType
{
Dispose,
CancellationToken
}

[ConditionalTheory(nameof(IsMsQuicSupported))]
[InlineData(CancellationType.Dispose)]
[InlineData(CancellationType.CancellationToken)]
public async Task ResponseCancellation_ServerReceivesCancellation(CancellationType type)
{
if (UseQuicImplementationProvider != QuicImplementationProviders.MsQuic)
{
return;
}

using Http3LoopbackServer server = CreateHttp3LoopbackServer();

using var clientDone = new SemaphoreSlim(0);
using var serverDone = new SemaphoreSlim(0);

Task serverTask = Task.Run(async () =>
{
using Http3LoopbackConnection connection = (Http3LoopbackConnection)await server.EstablishGenericConnectionAsync();
using Http3LoopbackStream stream = await connection.AcceptRequestStreamAsync();
HttpRequestData request = await stream.ReadRequestDataAsync().ConfigureAwait(false);
int contentLength = 2*1024*1024;
var headers = new List<HttpHeaderData>();
headers.Append(new HttpHeaderData("Content-Length", contentLength.ToString(CultureInfo.InvariantCulture)));
await stream.SendResponseHeadersAsync(HttpStatusCode.OK, headers).ConfigureAwait(false);
await stream.SendDataFrameAsync(new byte[1024]).ConfigureAwait(false);
await clientDone.WaitAsync();
// It is possible that PEER_RECEIVE_ABORTED event will arrive with a significant delay after peer calls AbortReceive
// In that case even with synchronization via semaphores, first writes after peer aborting may "succeed" (get SEND_COMPLETE event)
// We are asserting that PEER_RECEIVE_ABORTED would still arrive eventually
var ex = await Assert.ThrowsAsync<QuicStreamAbortedException>(() => SendDataForever(stream).WaitAsync(TimeSpan.FromSeconds(10)));
Assert.Equal((type == CancellationType.CancellationToken ? 268 : 0xffffffff), ex.ErrorCode);
serverDone.Release();
});

Task clientTask = Task.Run(async () =>
{
using HttpClient client = CreateHttpClient();
using HttpRequestMessage request = new()
{
Method = HttpMethod.Get,
RequestUri = server.Address,
Version = HttpVersion30,
VersionPolicy = HttpVersionPolicy.RequestVersionExact
};
HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).WaitAsync(TimeSpan.FromSeconds(10));
Stream stream = await response.Content.ReadAsStreamAsync();
int bytesRead = await stream.ReadAsync(new byte[1024]);
Assert.Equal(1024, bytesRead);
var cts = new CancellationTokenSource(200);
if (type == CancellationType.Dispose)
{
cts.Token.Register(() => response.Dispose());
}
CancellationToken readCt = type == CancellationType.CancellationToken ? cts.Token : default;
Exception ex = await Assert.ThrowsAnyAsync<Exception>(() => stream.ReadAsync(new byte[1024], cancellationToken: readCt).AsTask());
if (type == CancellationType.CancellationToken)
{
Assert.IsType<OperationCanceledException>(ex);
}
else
{
var ioe = Assert.IsType<IOException>(ex);
var hre = Assert.IsType<HttpRequestException>(ioe.InnerException);
Assert.IsType<QuicOperationAbortedException>(hre.InnerException);
}
clientDone.Release();
await serverDone.WaitAsync();
});

await new[] { clientTask, serverTask }.WhenAllOrAnyFailed(20_000);
}

[Fact]
public async Task ResponseCancellation_BothCancellationTokenAndDispose_Success()
{
if (UseQuicImplementationProvider != QuicImplementationProviders.MsQuic)
{
return;
}

using Http3LoopbackServer server = CreateHttp3LoopbackServer();

using var clientDone = new SemaphoreSlim(0);
using var serverDone = new SemaphoreSlim(0);

Task serverTask = Task.Run(async () =>
{
using Http3LoopbackConnection connection = (Http3LoopbackConnection)await server.EstablishGenericConnectionAsync();
using Http3LoopbackStream stream = await connection.AcceptRequestStreamAsync();
HttpRequestData request = await stream.ReadRequestDataAsync().ConfigureAwait(false);
int contentLength = 2*1024*1024;
var headers = new List<HttpHeaderData>();
headers.Append(new HttpHeaderData("Content-Length", contentLength.ToString(CultureInfo.InvariantCulture)));
await stream.SendResponseHeadersAsync(HttpStatusCode.OK, headers).ConfigureAwait(false);
await stream.SendDataFrameAsync(new byte[1024]).ConfigureAwait(false);
await clientDone.WaitAsync();
// It is possible that PEER_RECEIVE_ABORTED event will arrive with a significant delay after peer calls AbortReceive
// In that case even with synchronization via semaphores, first writes after peer aborting may "succeed" (get SEND_COMPLETE event)
// We are asserting that PEER_RECEIVE_ABORTED would still arrive eventually
var ex = await Assert.ThrowsAsync<QuicStreamAbortedException>(() => SendDataForever(stream).WaitAsync(TimeSpan.FromSeconds(20)));
// exact error code depends on who won the race
Assert.True(ex.ErrorCode == 268 /* cancellation */ || ex.ErrorCode == 0xffffffff /* disposal */, $"Expected 268 or 0xffffffff, got {ex.ErrorCode}");
serverDone.Release();
});

Task clientTask = Task.Run(async () =>
{
using HttpClient client = CreateHttpClient();
using HttpRequestMessage request = new()
{
Method = HttpMethod.Get,
RequestUri = server.Address,
Version = HttpVersion30,
VersionPolicy = HttpVersionPolicy.RequestVersionExact
};
HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).WaitAsync(TimeSpan.FromSeconds(20));
Stream stream = await response.Content.ReadAsStreamAsync();
int bytesRead = await stream.ReadAsync(new byte[1024]);
Assert.Equal(1024, bytesRead);
var cts = new CancellationTokenSource(200);
cts.Token.Register(() => response.Dispose());
Exception ex = await Assert.ThrowsAnyAsync<Exception>(() => stream.ReadAsync(new byte[1024], cancellationToken: cts.Token).AsTask());
// exact exception depends on who won the race
if (ex is not OperationCanceledException and not ObjectDisposedException)
{
var ioe = Assert.IsType<IOException>(ex);
var hre = Assert.IsType<HttpRequestException>(ioe.InnerException);
Assert.IsType<QuicOperationAbortedException>(hre.InnerException);
}
clientDone.Release();
await serverDone.WaitAsync();
});

await new[] { clientTask, serverTask }.WhenAllOrAnyFailed(200_000);
}

private static async Task SendDataForever(Http3LoopbackStream stream)
{
var buf = new byte[100];
while (true)
{
await stream.SendDataFrameAsync(buf);
}
}

/// <summary>
/// These are public interop test servers for various QUIC and HTTP/3 implementations,
/// taken from https://github.com/quicwg/base-drafts/wiki/Implementations
Expand Down
15 changes: 13 additions & 2 deletions src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/MsQuic/MsQuicStream.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -718,6 +718,7 @@ private void Dispose(bool disposing)

bool callShutdown = false;
bool abortRead = false;
bool completeRead = false;
bool releaseHandles = false;
lock (_state)
{
Expand All @@ -726,9 +727,13 @@ private void Dispose(bool disposing)
callShutdown = true;
}

if (_state.ReadState < ReadState.ReadsCompleted)
// We can enter Aborted state from both AbortRead call (aborts on the wire) and a Cancellation callback (only changes state)
// We need to ensure read is aborted on the wire here. We let msquic handle a second call to abort as a no-op
if (_state.ReadState < ReadState.ReadsCompleted || _state.ReadState == ReadState.Aborted)
{
abortRead = true;
completeRead = _state.ReadState == ReadState.PendingRead;
_state.Stream = null;
_state.ReadState = ReadState.Aborted;
}

Expand Down Expand Up @@ -762,6 +767,12 @@ private void Dispose(bool disposing)
} catch (ObjectDisposedException) { };
}

if (completeRead)
{
_state.ReceiveResettableCompletionSource.CompleteException(
ExceptionDispatchInfo.SetCurrentStackTrace(new QuicOperationAbortedException("Read was canceled")));
}

if (releaseHandles)
{
_state.Cleanup();
Expand Down Expand Up @@ -943,7 +954,7 @@ private static uint HandleEventPeerRecvAborted(State state, ref StreamEvent evt)
shouldComplete = true;
}
state.SendState = SendState.Aborted;
state.SendErrorCode = (long)evt.Data.PeerSendAborted.ErrorCode;
state.SendErrorCode = (long)evt.Data.PeerReceiveAborted.ErrorCode;
}

if (shouldComplete)
Expand Down
3 changes: 2 additions & 1 deletion src/libraries/System.Net.Quic/tests/FunctionalTests/QuicStreamTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -569,7 +569,8 @@ await RunClientServer(
await using QuicStream stream = await connection.AcceptStreamAsync();
QuicStreamAbortedException ex = await Assert.ThrowsAsync<QuicStreamAbortedException>(() => WriteForever(stream));
Assert.Equal(expectedErrorCode, ex.ErrorCode);
// [ActiveIssue("https://github.com/dotnet/runtime/issues/55746")]
//Assert.Equal(expectedErrorCode, ex.ErrorCode);
// We should still return true from CanWrite, even though the write has been aborted.
Assert.True(stream.CanWrite);
Expand Down

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