resiprocate/reTurn/AsyncSocketBase.cxx

#include "AsyncSocketBase.hxx"
#include "AsyncSocketBaseHandler.hxx"
#include <rutil/WinLeakCheck.hxx>
#include <rutil/Logger.hxx>
#include "ReTurnSubsystem.hxx"

#include <functional>

#define RESIPROCATE_SUBSYSTEM ReTurnSubsystem::RETURN

using namespace std;

#define NO_CHANNEL ((unsigned short)-1)

namespace reTurn {

AsyncSocketBase::AsyncSocketBase(asio::io_context& ioService) : 
  mIOService(ioService),
  mReceiving(false),
  mConnected(false),
  mAsyncSocketBaseHandler(nullptr)
{
}

AsyncSocketBase::~AsyncSocketBase()
{
   if(mAsyncSocketBaseHandler) mAsyncSocketBaseHandler->onSocketDestroyed();
}

void 
AsyncSocketBase::send(const StunTuple& destination, const std::shared_ptr<DataBuffer>& data)
{
   shared_ptr<AsyncSocketBase> _this = shared_from_this();
   asio::dispatch(mIOService, std::bind([_this, destination, data](){
	   _this->doSend(destination, data, 0);
   }));
}

void 
AsyncSocketBase::send(const StunTuple& destination, unsigned short channel, const std::shared_ptr<DataBuffer>& data)
{
   shared_ptr<AsyncSocketBase> _this = shared_from_this();
   asio::dispatch(mIOService, std::bind([_this, destination, channel, data](){
      _this->doSend(destination, channel, data, 0);
   }));
}

void
AsyncSocketBase::doSend(const StunTuple& destination, const std::shared_ptr<DataBuffer>& data, const std::size_t bufferStartPos)
{
   doSend(destination, NO_CHANNEL, data, bufferStartPos);
}

void
AsyncSocketBase::doSend(const StunTuple& destination, unsigned short channel, const std::shared_ptr<DataBuffer>& data, const std::size_t bufferStartPos)
{
   bool writeInProgress = !mSendDataQueue.empty();
   if (channel == NO_CHANNEL)
   {
      mSendDataQueue.push_back(SendData(destination, nullptr, data, bufferStartPos));
   }
   else
   {
      // Add Turn Framing
      const auto frame = allocateBuffer(4);
      channel = htons(channel);
      memcpy(&(*frame)[0], &channel, 2);
      unsigned short msgsize = htons((unsigned short)data->size());
      memcpy(&(*frame)[2], (void*)&msgsize, 2);
      // TODO !SLG! - if sending over TCP/TLS then message must be padded to be on a 4 byte boundary
      mSendDataQueue.push_back(SendData(destination, frame, data, bufferStartPos));
   }
   if (!writeInProgress)
   {
      sendFirstQueuedData();
   }
}

void 
AsyncSocketBase::handleSend(const asio::error_code& e)
{
   if(!e)
   {
      onSendSuccess();
   }
   else
   {
      DebugLog(<< "handleSend with error: " << e);
      onSendFailure(e);
   }

   // TODO - check if closed here, and if so don't try and send more
   // Clear this data from the queue and see if there is more data to send
   mSendDataQueue.pop_front();
   if (!mSendDataQueue.empty())
   {
      sendFirstQueuedData();
   }
}

void 
AsyncSocketBase::sendFirstQueuedData()
{
   std::vector<asio::const_buffer> bufs;
   if (mSendDataQueue.front().mFrameData) // If we have frame data
   {
      bufs.push_back(asio::buffer(mSendDataQueue.front().mFrameData->data(), mSendDataQueue.front().mFrameData->size()));
   }
   bufs.push_back(asio::buffer(mSendDataQueue.front().mData->data()+mSendDataQueue.front().mBufferStartPos, mSendDataQueue.front().mData->size()-mSendDataQueue.front().mBufferStartPos));
   transportSend(mSendDataQueue.front().mDestination, bufs);
}

void 
AsyncSocketBase::receive()
{
   asio::post(mIOService, std::bind(&AsyncSocketBase::doReceive, shared_from_this()));
}

void
AsyncSocketBase::doReceive()
{
   if(!mReceiving)
   {
      mReceiving=true;
      mReceiveBuffer = allocateBuffer(RECEIVE_BUFFER_SIZE);
      transportReceive();
   }
}

void 
AsyncSocketBase::framedReceive()
{
   asio::post(mIOService, std::bind(&AsyncSocketBase::doFramedReceive, shared_from_this()));
}

void
AsyncSocketBase::doFramedReceive()
{
   if(!mReceiving)
   {
      mReceiving=true;
      mReceiveBuffer = allocateBuffer(RECEIVE_BUFFER_SIZE);
      transportFramedReceive();
   }
}

void 
AsyncSocketBase::handleReceive(const asio::error_code& e, const size_t bytesTransferred)
{
   mReceiving = false;

   if(!e)
   {
      // Handoff received buffer to appliction, and prepare receive buffer for next call
      mReceiveBuffer->truncate(bytesTransferred);
      onReceiveSuccess(getSenderEndpointAddress(), getSenderEndpointPort(), mReceiveBuffer);
   }
   else
   {
      DebugLog(<< "handleReceive with error: " << e);
      onReceiveFailure(e);
   }
}

void 
AsyncSocketBase::close()
{
   asio::post(mIOService, std::bind(&AsyncSocketBase::transportClose, shared_from_this()));
}

std::shared_ptr<DataBuffer>  
AsyncSocketBase::allocateBuffer(const size_t size)
{
   return std::make_shared<DataBuffer>(size);
}

} // namespace


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