/// <inheritdoc />
public async Task WriteAsync(TWritePayloadBaseType payload)
{
//Serializer the payload first so we can build the header
byte[] payloadData = Serializer.Serialize(payload);
IPacketHeader header = PacketHeaderFactory.Create(payload, payloadData);
//VERY critical we lock here otherwise we could write a header and then another unrelated body could be written inbetween
using (await writeSynObj.LockAsync().ConfigureAwait(false))
{
//It's important to always write the header first
await HeaderReaderWriter.WriteHeaderAsync(header)
.ConfigureAwait(false);
//Write the outgoing message, it will internally create the header and it will be serialized
await DecoratedClient.WriteAsync(payloadData)
.ConfigureAwait(false);
}
}
public async Task <NetworkIncomingMessage <TReadPayloadBaseType> > ReadAsync(CancellationToken token)
{
IPacketHeader header = null;
TReadPayloadBaseType payload = null;
using (await readSynObj.LockAsync(token).ConfigureAwait(false))
{
//Read the header first
header = await HeaderReaderWriter.ReadHeaderAsync(token)
.ConfigureAwait(false);
//If the header is null it means the socket disconnected
if (header == null)
{
return(null);
}
//if was canceled the header reading probably returned null anyway
if (token.IsCancellationRequested)
{
return(null);
}
//We need to read enough bytes to deserialize the payload
await ReadAsync(PacketPayloadReadBuffer, 0, header.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);
}
//WARNING: We must do deserialization inside of the lock otherwise we can encounter a race condition
//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.
payload = Serializer.Deserialize <TReadPayloadBaseType>(PacketPayloadReadBuffer, 0, header.PayloadSize);
}
return(new NetworkIncomingMessage <TReadPayloadBaseType>(header, payload));
}
