public static async Task DecodeFramingFaultAsync(ClientFramingDecoder decoder, IConnection connection,
Uri via, string contentType, TimeoutHelper timeoutHelper)
{
ValidateReadingFaultString(decoder);
int offset = 0;
byte[] faultBuffer = Fx.AllocateByteArray(FaultStringDecoder.FaultSizeQuota);
int size = await connection.ReadAsync(0, Math.Min(FaultStringDecoder.FaultSizeQuota, connection.AsyncReadBufferSize),
timeoutHelper.RemainingTime());
while (size > 0)
{
int bytesDecoded = decoder.Decode(connection.AsyncReadBuffer, offset, size);
offset += bytesDecoded;
size -= bytesDecoded;
if (decoder.CurrentState == ClientFramingDecoderState.Fault)
{
ConnectionUtilities.CloseNoThrow(connection, timeoutHelper.RemainingTime());
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
FaultStringDecoder.GetFaultException(decoder.Fault, via.ToString(), contentType));
}
else
{
if (decoder.CurrentState != ClientFramingDecoderState.ReadingFaultString)
{
throw Fx.AssertAndThrow("invalid framing client state machine");
}
if (size == 0)
{
offset = 0;
size = await connection.ReadAsync(0, Math.Min(FaultStringDecoder.FaultSizeQuota, connection.AsyncReadBufferSize),
timeoutHelper.RemainingTime());
}
}
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(decoder.CreatePrematureEOFException());
}
public override int Decode(byte[] bytes, int offset, int size)
{
DecoderHelper.ValidateSize(size);
try
{
int bytesConsumed;
FramingRecordType recordType;
switch (CurrentState)
{
case ClientFramingDecoderState.ReadingUpgradeRecord:
recordType = (FramingRecordType)bytes[offset];
if (recordType == FramingRecordType.UpgradeResponse)
{
bytesConsumed = 1;
base.CurrentState = ClientFramingDecoderState.UpgradeResponse;
}
else
{
bytesConsumed = 0;
base.CurrentState = ClientFramingDecoderState.ReadingAckRecord;
}
break;
case ClientFramingDecoderState.UpgradeResponse:
bytesConsumed = 0;
base.CurrentState = ClientFramingDecoderState.ReadingUpgradeRecord;
break;
case ClientFramingDecoderState.ReadingAckRecord:
recordType = (FramingRecordType)bytes[offset];
if (recordType == FramingRecordType.Fault)
{
bytesConsumed = 1;
_faultDecoder = new FaultStringDecoder();
base.CurrentState = ClientFramingDecoderState.ReadingFaultString;
break;
}
ValidatePreambleAck(recordType);
bytesConsumed = 1;
base.CurrentState = ClientFramingDecoderState.Start;
break;
case ClientFramingDecoderState.Start:
bytesConsumed = 0;
base.CurrentState = ClientFramingDecoderState.ReadingEnvelopeRecord;
break;
case ClientFramingDecoderState.ReadingEnvelopeRecord:
recordType = (FramingRecordType)bytes[offset];
if (recordType == FramingRecordType.End)
{
bytesConsumed = 1;
base.CurrentState = ClientFramingDecoderState.End;
break;
}
else if (recordType == FramingRecordType.Fault)
{
bytesConsumed = 0;
base.CurrentState = ClientFramingDecoderState.ReadingFault;
break;
}
ValidateRecordType(FramingRecordType.UnsizedEnvelope, recordType);
bytesConsumed = 1;
base.CurrentState = ClientFramingDecoderState.EnvelopeStart;
break;
case ClientFramingDecoderState.EnvelopeStart:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
CreateException(new InvalidDataException(SR.FramingAtEnd)));
case ClientFramingDecoderState.ReadingFault:
recordType = (FramingRecordType)bytes[offset];
ValidateRecordType(FramingRecordType.Fault, recordType);
bytesConsumed = 1;
_faultDecoder = new FaultStringDecoder();
base.CurrentState = ClientFramingDecoderState.ReadingFaultString;
break;
case ClientFramingDecoderState.ReadingFaultString:
bytesConsumed = _faultDecoder.Decode(bytes, offset, size);
if (_faultDecoder.IsValueDecoded)
{
base.CurrentState = ClientFramingDecoderState.Fault;
}
break;
case ClientFramingDecoderState.Fault:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
CreateException(new InvalidDataException(SR.FramingAtEnd)));
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
CreateException(new InvalidDataException(SR.InvalidDecoderStateMachine)));
}
StreamPosition += bytesConsumed;
return(bytesConsumed);
}
catch (InvalidDataException e)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(CreateException(e));
}
}