multicast-udp-transport.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "multicast-udp-transport.hpp"
#include "udp-protocol.hpp"

namespace nfd {
namespace face {

NFD_LOG_INCLASS_2TEMPLATE_SPECIALIZATION_DEFINE(DatagramTransport, MulticastUdpTransport::protocol,
                                                Multicast, "MulticastUdpTransport");

MulticastUdpTransport::MulticastUdpTransport(const protocol::endpoint& localEndpoint,
                                             const protocol::endpoint& multicastGroup,
                                             protocol::socket&& recvSocket,
                                             protocol::socket&& sendSocket)
  : DatagramTransport(std::move(recvSocket))
  , m_multicastGroup(multicastGroup)
  , m_sendSocket(std::move(sendSocket))
{
  this->setLocalUri(FaceUri(localEndpoint));
  this->setRemoteUri(FaceUri(multicastGroup));
  this->setScope(ndn::nfd::FACE_SCOPE_NON_LOCAL);
  this->setPersistency(ndn::nfd::FACE_PERSISTENCY_PERMANENT);
  this->setLinkType(ndn::nfd::LINK_TYPE_MULTI_ACCESS);
  this->setMtu(udp::computeMtu(localEndpoint));

  NFD_LOG_FACE_INFO("Creating transport");
}

void
MulticastUdpTransport::beforeChangePersistency(ndn::nfd::FacePersistency newPersistency)
{
  if (newPersistency != ndn::nfd::FACE_PERSISTENCY_PERMANENT) {
    BOOST_THROW_EXCEPTION(
      std::invalid_argument("MulticastUdpTransport supports only FACE_PERSISTENCY_PERMANENT"));
  }
}

void
MulticastUdpTransport::doSend(Transport::Packet&& packet)
{
  NFD_LOG_FACE_TRACE(__func__);

  m_sendSocket.async_send_to(boost::asio::buffer(packet.packet), m_multicastGroup,
                             bind(&MulticastUdpTransport::handleSend, this,
                                  boost::asio::placeholders::error,
                                  boost::asio::placeholders::bytes_transferred,
                                  packet.packet));
}

void
MulticastUdpTransport::doClose()
{
  if (m_sendSocket.is_open()) {
    NFD_LOG_FACE_TRACE("Closing sending socket");

    // Cancel all outstanding operations and close the socket.
    // Use the non-throwing variants and ignore errors, if any.
    boost::system::error_code error;
    m_sendSocket.cancel(error);
    m_sendSocket.close(error);
  }

  DatagramTransport::doClose();
}

template<>
Transport::EndpointId
DatagramTransport<boost::asio::ip::udp, Multicast>::makeEndpointId(const protocol::endpoint& ep)
{
  // IPv6 multicast is not supported
  BOOST_ASSERT(ep.address().is_v4());

  return (static_cast<uint64_t>(ep.port()) << 32) |
          static_cast<uint64_t>(ep.address().to_v4().to_ulong());
}

} // namespace face
} // namespace nfd