public virtual async Task <NetworkIncomingMessage <TReadPayloadBaseType> > ReadAsync(CancellationToken token)
{
try
{
using (await readSynObj.LockAsync(token).ConfigureAwait(false))
{
//if was canceled the header reading probably returned null anyway
if (token.IsCancellationRequested)
{
return(null);
}
//Custom 317 Protocol:
//2 byte short payload length.
//1 byte opcode (in the payload data).
//payload length
await ReadAsync(PacketPayloadReadBuffer, 0, 2, token)
.ConfigureAwait(false);
//We read from the payload buffer 2 bytes, it's the size.
int payloadSize = PacketPayloadReadBuffer.Reinterpret <short>(0);
//If the token was canceled then the buffer isn't filled and we can't make a message
if (token.IsCancellationRequested)
{
return(null);
}
//We need to read enough bytes to deserialize the payload
await ReadAsync(PacketPayloadReadBuffer, 0, payloadSize, token)
.ConfigureAwait(false); //TODO: Should we timeout?
//If the token was canceled then the buffer isn't filled and we can't make a message
if (token.IsCancellationRequested)
{
return(null);
}
//Deserialize the bytes starting from the begining but ONLY read up to the payload size. We reuse this buffer and it's large
//so if we don't specify the length we could end up with an issue.
var payload = Serializer.Deserialize <TReadPayloadBaseType>(PacketPayloadReadBuffer, 0, payloadSize);
return(new NetworkIncomingMessage <TReadPayloadBaseType>(new HeaderlessPacketHeader(payloadSize), payload));
}
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
}
protected override async Task <IPacketHeader> BuildHeaderWithDecryption(CancellationToken token)
{
//Unlike 3.3.5 the 1.12.1 server header is simplier
//It is just 2 byte size and 2 byte opcode.
//But the caller really only wants size. Not opcode
await ReadAsync(PacketPayloadReadBuffer, 0, 2, token)
.ConfigureAwait(false);
if (CryptoService.isInitialized)
{
CryptoService.DecryptionService.ProcessBytes(PacketPayloadReadBuffer, 0, 2, PacketPayloadReadBuffer, 0);
}
//It's big endian though so we need to reverse it
//it is safe to do this hack because it will be overridden when more data is read.
PacketPayloadReadBuffer[2] = PacketPayloadReadBuffer[0];
ushort size = PacketPayloadReadBuffer.Reinterpret <ushort>(1);
Console.WriteLine($"Recieved server packet header size: {size}");
return(new ServerPacketHeader(size));
}
