private Task EnsureControlStreamAcceptedAsync()
{
if (_inboundControlStream != null)
{
return(Task.CompletedTask);
}
return(EnsureControlStreamAcceptedInternalAsync());
async Task EnsureControlStreamAcceptedInternalAsync()
{
Http3LoopbackStream controlStream;
while (true)
{
QuicStream quicStream = await _connection.AcceptInboundStreamAsync().ConfigureAwait(false);
if (!quicStream.CanWrite)
{
// control stream accepted
controlStream = new Http3LoopbackStream(quicStream);
break;
}
// control streams are unidirectional, so this must be a request stream
// keep it for later and wait for another stream
_delayedStreams.Enqueue(quicStream);
}
long?streamType = await controlStream.ReadIntegerAsync();
Assert.Equal(Http3LoopbackStream.ControlStream, streamType);
List <(long settingId, long settingValue)> settings = await controlStream.ReadSettingsAsync();
(long settingId, long settingValue) = Assert.Single(settings);
Assert.Equal(Http3LoopbackStream.MaxHeaderListSize, settingId);
MaxHeaderListSize = settingValue;
_inboundControlStream = controlStream;
}
}
public override async ValueTask <ConnectionContext?> AcceptAsync(CancellationToken cancellationToken = default)
{
try
{
var stream = await _connection.AcceptInboundStreamAsync(cancellationToken);
QuicStreamContext?context = null;
// Only use pool for bidirectional streams. Just a handful of unidirecitonal
// streams are created for a connection and they live for the lifetime of the connection.
if (stream.CanRead && stream.CanWrite)
{
lock (_poolLock)
{
StreamPool.TryPop(out context);
}
}
if (context == null)
{
context = new QuicStreamContext(this, _context);
context.Initialize(stream);
}
else
{
context.ResetFeatureCollection();
context.ResetItems();
context.Initialize(stream);
QuicLog.StreamReused(_log, context);
}
context.Start();
QuicLog.AcceptedStream(_log, context);
return(context);
}
catch (QuicException ex) when(ex.QuicError == QuicError.ConnectionAborted)
{
// Shutdown initiated by peer, abortive.
_error = ex.ApplicationErrorCode;
QuicLog.ConnectionAborted(_log, this, ex.ApplicationErrorCode.GetValueOrDefault(), ex);
ThreadPool.UnsafeQueueUserWorkItem(state =>
{
state.CancelConnectionClosedToken();
},
this,
preferLocal: false);
// Throw error so consumer sees the connection is aborted by peer.
throw new ConnectionResetException(ex.Message, ex);
}
catch (QuicException ex) when(ex.QuicError == QuicError.OperationAborted)
{
lock (_shutdownLock)
{
// This error should only happen when shutdown has been initiated by the server.
// If there is no abort reason and we have this error then the connection is in an
// unexpected state. Abort connection and throw reason error.
if (_abortReason == null)
{
Abort(new ConnectionAbortedException("Unexpected error when accepting stream.", ex));
}
_abortReason !.Throw();
}
}
catch (OperationCanceledException)
{
Debug.Assert(cancellationToken.IsCancellationRequested, "Error requires cancellation is requested.");
lock (_shutdownLock)
{
// Connection has been aborted. Throw reason exception.
_abortReason?.Throw();
}
}
catch (Exception ex)
{
Debug.Fail($"Unexpected exception in {nameof(QuicConnectionContext)}.{nameof(AcceptAsync)}: {ex}");
throw;
}
// Return null for graceful closure or cancellation.
return(null);
}
protected override async Task <StreamPair> CreateConnectedStreamsAsync()
{
var listener = await QuicListener.ListenAsync(new QuicListenerOptions()
{
ListenEndPoint = new IPEndPoint(IPAddress.Loopback, 0),
ApplicationProtocols = new List <SslApplicationProtocol>()
{
new SslApplicationProtocol("quictest")
},
ConnectionOptionsCallback = (_, _, _) => ValueTask.FromResult(new QuicServerConnectionOptions()
{
DefaultStreamErrorCode = QuicTestBase.DefaultStreamErrorCodeServer,
DefaultCloseErrorCode = QuicTestBase.DefaultCloseErrorCodeServer,
ServerAuthenticationOptions = GetSslServerAuthenticationOptions()
})
});
byte[] buffer = new byte[1] {
42
};
QuicConnection connection1 = null, connection2 = null;
QuicStream stream1 = null, stream2 = null;
try
{
await WhenAllOrAnyFailed(
Task.Run(async() =>
{
connection1 = await listener.AcceptConnectionAsync();
stream1 = await connection1.AcceptInboundStreamAsync();
Assert.Equal(1, await stream1.ReadAsync(buffer));
}),
Task.Run(async() =>
{
try
{
connection2 = await QuicConnection.ConnectAsync(new QuicClientConnectionOptions()
{
DefaultStreamErrorCode = QuicTestBase.DefaultStreamErrorCodeClient,
DefaultCloseErrorCode = QuicTestBase.DefaultCloseErrorCodeClient,
RemoteEndPoint = listener.LocalEndPoint,
ClientAuthenticationOptions = GetSslClientAuthenticationOptions()
});
stream2 = await connection2.OpenOutboundStreamAsync(QuicStreamType.Bidirectional);
// OpenBidirectionalStream only allocates ID. We will force stream opening
// by Writing there and receiving data on the other side.
await stream2.WriteAsync(buffer);
}
catch (Exception ex)
{
_output?.WriteLine($"Failed to {ex.Message}");
throw;
}
}));
// No need to keep the listener once we have connected connection and streams
await listener.DisposeAsync();
var result = new StreamPairWithOtherDisposables(stream1, stream2);
result.Disposables.Add(connection1);
result.Disposables.Add(connection2);
return(result);
}
catch
{
if (stream1 is not null)
{
await stream1.DisposeAsync();
}
if (stream2 is not null)
{
await stream2.DisposeAsync();
}
if (connection1 is not null)
{
await connection1.DisposeAsync();
}
if (connection2 is not null)
{
await connection2.DisposeAsync();
}
throw;
}
}