lp-reassembler.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NFD_DAEMON_FACE_LP_REASSEMBLER_HPP
#define NFD_DAEMON_FACE_LP_REASSEMBLER_HPP

#include "core/scheduler.hpp"
#include "face-log.hpp"
#include "transport.hpp"

#include <ndn-cxx/lp/packet.hpp>

namespace nfd {
namespace face {

class LinkService;

class LpReassembler : noncopyable
{
public:
  class Options
  {
  public:
    Options();

  public:
    size_t nMaxFragments;

    time::nanoseconds reassemblyTimeout;
  };

  explicit
  LpReassembler(const Options& options = Options(), const LinkService* linkService = nullptr);

  void
  setOptions(const Options& options);

  const LinkService*
  getLinkService() const;

  std::tuple<bool, Block, lp::Packet>
  receiveFragment(Transport::EndpointId remoteEndpoint, const lp::Packet& packet);

  size_t
  size() const;

  signal::Signal<LpReassembler, Transport::EndpointId, size_t> beforeTimeout;

private:
  struct PartialPacket
  {
    std::vector<lp::Packet> fragments;
    size_t fragCount; 
    size_t nReceivedFragments; 
    scheduler::ScopedEventId dropTimer;
  };

  typedef std::tuple<
    Transport::EndpointId, // remoteEndpoint
    lp::Sequence // message identifier (sequence of the first fragment)
  > Key;

  Block
  doReassembly(const Key& key);

  void
  timeoutPartialPacket(const Key& key);

private:
  Options m_options;
  std::map<Key, PartialPacket> m_partialPackets;
  const LinkService* m_linkService;
};

std::ostream&
operator<<(std::ostream& os, const FaceLogHelper<LpReassembler>& flh);

inline void
LpReassembler::setOptions(const Options& options)
{
  m_options = options;
}

inline const LinkService*
LpReassembler::getLinkService() const
{
  return m_linkService;
}

inline size_t
LpReassembler::size() const
{
  return m_partialPackets.size();
}

} // namespace face
} // namespace nfd

#endif // NFD_DAEMON_FACE_LP_REASSEMBLER_HPP