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Avoid sending EndStream after RST_STREAM with dedicated lock #54552

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Merged
merged 5 commits into from
Jun 29, 2021
Merged

Avoid sending EndStream after RST_STREAM with dedicated lock #54552

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e1361f1
Avoid sending EndStream after RST_STREAM with dedicated lock
alnikola Jun 22, 2021
9881121
Use lock(SyncObject) for sending RST_STREAM and EndStream
alnikola Jun 22, 2021
9bb75ee
Remove Debug.Assert
alnikola Jun 23, 2021
a209599
Locking moved to SendReset callers
alnikola Jun 25, 2021
9166a80
Comment removed
alnikola Jun 29, 2021
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29 changes: 17 additions & 12 deletions src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/Http2Stream.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -275,17 +275,17 @@ public async Task SendRequestBodyAsync(CancellationToken cancellationToken)
sendReset = _responseCompletionState == StreamCompletionState.Failed;
Complete();
}
}

if (sendReset)
{
SendReset();
}
else
{
// Send EndStream asynchronously and without cancellation.
// If this fails, it means that the connection is aborting and we will be reset.
_connection.LogExceptions(_connection.SendEndStreamAsync(StreamId));
if (sendReset)
{
SendReset();
}
else
{
// Send EndStream asynchronously and without cancellation.
// If this fails, it means that the connection is aborting and we will be reset.
_connection.LogExceptions(_connection.SendEndStreamAsync(StreamId));
}
}
}
}
Expand Down Expand Up @@ -325,7 +325,6 @@ public async ValueTask<bool> WaitFor100ContinueAsync(CancellationToken cancellat

private void SendReset()
{
Debug.Assert(!Monitor.IsEntered(SyncObject));
Debug.Assert(_requestCompletionState != StreamCompletionState.InProgress);
Debug.Assert(_responseCompletionState != StreamCompletionState.InProgress);
Debug.Assert(_requestCompletionState == StreamCompletionState.Failed || _responseCompletionState == StreamCompletionState.Failed,
Expand All @@ -336,7 +335,13 @@ private void SendReset()
// Don't send a RST_STREAM if we've already received one from the server.
if (_resetException == null)
{
_connection.LogExceptions(_connection.SendRstStreamAsync(StreamId, Http2ProtocolErrorCode.Cancel));
// Use dedicated lock to prevent sending a frame with EndStream flag after an RST_STREAM frame.
// If execution reached this line, it's guaranteed that
// _requestCompletionState == StreamCompletionState.Failed or _responseCompletionState == StreamCompletionState.Failed
lock (SyncObject)
{
_connection.LogExceptions(_connection.SendRstStreamAsync(StreamId, Http2ProtocolErrorCode.Cancel));
}
}
}

Expand Down