public async Task OnConnectedAsync(FramingConnection connection)
{
var decoder = new ServerSessionDecoder(ConnectionOrientedTransportDefaults.MaxViaSize, ConnectionOrientedTransportDefaults.MaxContentTypeSize);
ReadOnlySequence <byte> buffer;
while (decoder.CurrentState != ServerSessionDecoder.State.PreUpgradeStart)
{
var readResult = await connection.Input.ReadAsync();
buffer = readResult.Buffer;
while (buffer.Length > 0)
{
int bytesDecoded;
try
{
bytesDecoded = decoder.Decode(buffer);
}
catch (CommunicationException e)
{
// see if we need to send back a framing fault
string framingFault;
if (FramingEncodingString.TryGetFaultString(e, out framingFault))
{
// TODO: Drain the rest of the data and send a fault then close the connection
//byte[] drainBuffer = new byte[128];
//InitialServerConnectionReader.SendFault(
// Connection, framingFault, drainBuffer, GetRemainingTimeout(),
// MaxViaSize + MaxContentTypeSize);
//base.Close(GetRemainingTimeout());
}
throw;
}
if (bytesDecoded > 0)
{
buffer = buffer.Slice(bytesDecoded);
}
if (decoder.CurrentState == ServerSessionDecoder.State.PreUpgradeStart)
{
// We now know the Via address (which endpoint the client is connecting to).
// The connection now needs to be handled by the correct endpoint which can
// handle upgrades etc.
break; //exit loop
}
}
connection.Input.AdvanceTo(buffer.Start);
}
connection.ServerSessionDecoder = decoder;
await _next(connection);
}
private static void ProcessUpgradeRequest(FramingConnection connection, ServerSessionDecoder decoder)
{
var upgradeAcceptor = connection.StreamUpgradeAcceptor;
if (upgradeAcceptor == null)
{
// TODO: SendFault
//SendFault(FramingEncodingString.UpgradeInvalidFault, ref timeoutHelper);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
new ProtocolException(SR.Format(SR.UpgradeRequestToNonupgradableService, decoder.Upgrade)));
}
if (!upgradeAcceptor.CanUpgrade(decoder.Upgrade))
{
// TODO: SendFault
//SendFault(FramingEncodingString.UpgradeInvalidFault, ref timeoutHelper);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
new ProtocolException(SR.Format(SR.UpgradeProtocolNotSupported, decoder.Upgrade)));
}
}
private static void ValidateContentType(FramingConnection connection, ServerSessionDecoder decoder)
{
var messageEncoderFactory = connection.MessageEncoderFactory;
MessageEncoder messageEncoder = messageEncoderFactory.CreateSessionEncoder();
connection.MessageEncoder = messageEncoder;
if (!messageEncoder.IsContentTypeSupported(decoder.ContentType))
{
// TODO: Send fault response
//SendFault(FramingEncodingString.ContentTypeInvalidFault, ref timeoutHelper);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ProtocolException(SR.Format(
SR.ContentTypeMismatch, decoder.ContentType, messageEncoder.ContentType)));
}
ICompressedMessageEncoder compressedMessageEncoder = messageEncoder as ICompressedMessageEncoder;
if (compressedMessageEncoder != null && compressedMessageEncoder.CompressionEnabled)
{
compressedMessageEncoder.SetSessionContentType(decoder.ContentType);
}
}
public async Task OnConnectedAsync(FramingConnection connection)
{
var decoder = new ServerSessionDecoder(ConnectionOrientedTransportDefaults.MaxViaSize, ConnectionOrientedTransportDefaults.MaxContentTypeSize);
bool success = false;
try
{
ReadOnlySequence <byte> buffer;
while (decoder.CurrentState != ServerSessionDecoder.State.PreUpgradeStart)
{
var readResult = await connection.Input.ReadAsync();
buffer = readResult.Buffer;
while (buffer.Length > 0)
{
int bytesDecoded = decoder.Decode(buffer);
if (bytesDecoded > 0)
{
buffer = buffer.Slice(bytesDecoded);
}
if (decoder.CurrentState == ServerSessionDecoder.State.PreUpgradeStart)
{
// We now know the Via address (which endpoint the client is connecting to).
// The connection now needs to be handled by the correct endpoint which can
// handle upgrades etc.
break; //exit loop
}
}
connection.Input.AdvanceTo(buffer.Start);
}
success = true;
}
catch (CommunicationException exception)
{
DiagnosticUtility.TraceHandledException(exception, TraceEventType.Information);
}
catch (OperationCanceledException exception)
{
//if (TD.ReceiveTimeoutIsEnabled())
//{
// TD.ReceiveTimeout(exception.Message);
//}
DiagnosticUtility.TraceHandledException(exception, TraceEventType.Information);
}
catch (TimeoutException exception)
{
//if (TD.ReceiveTimeoutIsEnabled())
//{
// TD.ReceiveTimeout(exception.Message);
//}
DiagnosticUtility.TraceHandledException(exception, TraceEventType.Information);
}
catch (Exception e)
{
if (Fx.IsFatal(e))
{
throw;
}
if (!TransportExceptionHandler.HandleTransportExceptionHelper(e))
{
throw;
}
// containment -- all exceptions abort the reader, no additional containment action necessary
}
finally
{
if (!success)
{
// TODO: On .NET Framework, this Abort call via a long winding path of plumbing will trigger a new pending Accept
// as this connection establishment handshake has failed. Some back pressure mechanism needs to be implemented to
// stop extra incoming connection handshakes from being started. Maybe a semaphore which is async waited at initial
// incoming request and then released on completion of handshake or on an exception. It also closes the connection
// so that's all that's happening here for now. Returning and completing the task will cause the connection to be closed.
connection.Abort();
}
}
if (success)
{
connection.FramingDecoder = decoder;
await _next(connection);
}
// else:
// returning will close the connection if it hasn't already been.
}