protected bool Send( int connectionId, byte[] key, InternalMessage message, ChannelIndex channel, BitWriter writer, bool sendImmediately, out string error )
{
MessageSecurity security = AlpacaConstant.GetSecurity( channel );
if( !WrapMessage( message, security, writer, key, out error ) )
{
return false;
}
//_profiler.StartEvent(TickType.Send, (uint)stream.Length, channelName, AlpacaConstant.INTERNAL_MESSAGE_NAME[messageType]);
DataStream s = writer.GetStream();
byte errorAsByte;
if( sendImmediately )
{
NetworkTransport.Send ( 0, connectionId, channel.GetIndex(), s.GetBuffer(), s.GetByteLength(), out errorAsByte);
}
else
{
NetworkTransport.QueueMessageForSending( 0, connectionId, channel.GetIndex(), s.GetBuffer(), s.GetByteLength(), out errorAsByte);
}
//_profiler.EndEvent();
if( (NetworkError)errorAsByte != NetworkError.Ok )
{
error = $"Send {AlpacaConstant.GetName(message)} to node {connectionId} failed with error{StringFromError(errorAsByte)}";
return false;
}
return true;
}
protected bool WrapMessage( InternalMessage message, MessageSecurity security, BitWriter writer, byte[] key, out string error )
{
if( !_commonSettings.enableEncryption && security != MessageSecurity.None )
{
error = "Attempted to send encrypted and/or authenticated message but encryption was not enabled";
return false;
}
bool authenticated = ((security & MessageSecurity.Authenticated) != 0);
bool encrypted = ((security & MessageSecurity.Encrypted ) != 0);
if( authenticated || encrypted )
{
Debug.Assert( false );
// TODO: handle encryption and authentication here
error = "WrapMessage: tried to apply encryption, but it was not enabled.";
return false;
}
DataStream writerStream = writer.GetStream();
int lastBytePos = writerStream.GetBytePosition();
// reset write head to write authentication and encryption bits
writer.Normal(authenticated);
writer.Normal(encrypted);
writerStream.SetBytePosition( lastBytePos );
byte messageByte = (byte)(((int)message) << 2);
writer.Normal<byte>( messageByte );
error = null;
return true;
}