transport.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2018,  Regents of the University of California,
 *                           Arizona Board of Regents,
 *                           Colorado State University,
 *                           University Pierre & Marie Curie, Sorbonne University,
 *                           Washington University in St. Louis,
 *                           Beijing Institute of Technology,
 *                           The University of Memphis.
 *
 * This file is part of NFD (Named Data Networking Forwarding Daemon).
 * See AUTHORS.md for complete list of NFD authors and contributors.
 *
 * NFD is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef NFD_DAEMON_FACE_TRANSPORT_HPP
#define NFD_DAEMON_FACE_TRANSPORT_HPP

#include "core/counter.hpp"
#include "face-log.hpp"

#include <ndn-cxx/encoding/nfd-constants.hpp>

namespace nfd {
namespace face {

class Face;
class LinkService;

enum class TransportState {
  NONE,
  UP, 
  DOWN, 
  CLOSING, 
  FAILED, 
  CLOSED 
};

std::ostream&
operator<<(std::ostream& os, TransportState state);

class TransportCounters
{
public:
  PacketCounter nInPackets;

  PacketCounter nOutPackets;

  ByteCounter nInBytes;

  ByteCounter nOutBytes;
};

const ssize_t MTU_UNLIMITED = -1;

const ssize_t MTU_INVALID = -2;

const ssize_t QUEUE_UNSUPPORTED = -1;

const ssize_t QUEUE_ERROR = -2;

class Transport : protected virtual TransportCounters, noncopyable
{
public:
  typedef uint64_t EndpointId;

  class Packet
  {
  public:
    Packet() = default;

    explicit
    Packet(Block&& packet);

  public:
    Block packet;

    EndpointId remoteEndpoint;
  };

  typedef TransportCounters Counters;

  Transport();

  virtual
  ~Transport();

public:
  void
  setFaceAndLinkService(Face& face, LinkService& service);

  const Face*
  getFace() const;

  const LinkService*
  getLinkService() const;

  LinkService*
  getLinkService();

  virtual const Counters&
  getCounters() const;

public: // upper interface
  void
  close();

  void
  send(Packet&& packet);

public: // static properties
  FaceUri
  getLocalUri() const;

  FaceUri
  getRemoteUri() const;

  ndn::nfd::FaceScope
  getScope() const;

  ndn::nfd::FacePersistency
  getPersistency() const;

  bool
  canChangePersistencyTo(ndn::nfd::FacePersistency newPersistency) const;

  void
  setPersistency(ndn::nfd::FacePersistency newPersistency);

  ndn::nfd::LinkType
  getLinkType() const;

  ssize_t
  getMtu() const;

  ssize_t
  getSendQueueCapacity() const;

public: // dynamic properties
  TransportState
  getState() const;

  signal::Signal<Transport, TransportState/*old*/, TransportState/*new*/> afterStateChange;

  time::steady_clock::TimePoint
  getExpirationTime() const;

  virtual ssize_t
  getSendQueueLength()
  {
    return QUEUE_UNSUPPORTED;
  }

protected: // upper interface to be invoked by subclass
  void
  receive(Packet&& packet);

protected: // properties to be set by subclass
  void
  setLocalUri(const FaceUri& uri);

  void
  setRemoteUri(const FaceUri& uri);

  void
  setScope(ndn::nfd::FaceScope scope);

  void
  setLinkType(ndn::nfd::LinkType linkType);

  void
  setMtu(ssize_t mtu);

  void
  setSendQueueCapacity(ssize_t sendQueueCapacity);

  void
  setState(TransportState newState);

  void
  setExpirationTime(const time::steady_clock::TimePoint& expirationTime);

protected: // to be overridden by subclass
  virtual bool
  canChangePersistencyToImpl(ndn::nfd::FacePersistency newPersistency) const;

  virtual void
  afterChangePersistency(ndn::nfd::FacePersistency oldPersistency);

  virtual void
  doClose() = 0;

private: // to be overridden by subclass
  virtual void
  doSend(Packet&& packet) = 0;

public:
  static constexpr ssize_t MIN_MTU = 64;

private:
  Face* m_face;
  LinkService* m_service;
  FaceUri m_localUri;
  FaceUri m_remoteUri;
  ndn::nfd::FaceScope m_scope;
  ndn::nfd::FacePersistency m_persistency;
  ndn::nfd::LinkType m_linkType;
  ssize_t m_mtu;
  ssize_t m_sendQueueCapacity;
  TransportState m_state;
  time::steady_clock::TimePoint m_expirationTime;
};

inline const Face*
Transport::getFace() const
{
  return m_face;
}

inline const LinkService*
Transport::getLinkService() const
{
  return m_service;
}

inline LinkService*
Transport::getLinkService()
{
  return m_service;
}

inline const Transport::Counters&
Transport::getCounters() const
{
  return *this;
}

inline FaceUri
Transport::getLocalUri() const
{
  return m_localUri;
}

inline void
Transport::setLocalUri(const FaceUri& uri)
{
  m_localUri = uri;
}

inline FaceUri
Transport::getRemoteUri() const
{
  return m_remoteUri;
}

inline void
Transport::setRemoteUri(const FaceUri& uri)
{
  m_remoteUri = uri;
}

inline ndn::nfd::FaceScope
Transport::getScope() const
{
  return m_scope;
}

inline void
Transport::setScope(ndn::nfd::FaceScope scope)
{
  m_scope = scope;
}

inline ndn::nfd::FacePersistency
Transport::getPersistency() const
{
  return m_persistency;
}

inline ndn::nfd::LinkType
Transport::getLinkType() const
{
  return m_linkType;
}

inline void
Transport::setLinkType(ndn::nfd::LinkType linkType)
{
  m_linkType = linkType;
}

inline ssize_t
Transport::getMtu() const
{
  return m_mtu;
}

inline void
Transport::setMtu(ssize_t mtu)
{
  BOOST_ASSERT(mtu == MTU_UNLIMITED || mtu > 0);
  m_mtu = mtu;
}

inline ssize_t
Transport::getSendQueueCapacity() const
{
  return m_sendQueueCapacity;
}

inline void
Transport::setSendQueueCapacity(ssize_t sendQueueCapacity)
{
  m_sendQueueCapacity = sendQueueCapacity;
}

inline TransportState
Transport::getState() const
{
  return m_state;
}

inline time::steady_clock::TimePoint
Transport::getExpirationTime() const
{
  return m_expirationTime;
}

inline void
Transport::setExpirationTime(const time::steady_clock::TimePoint& expirationTime)
{
  m_expirationTime = expirationTime;
}

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

template<typename T>
typename std::enable_if<std::is_base_of<Transport, T>::value &&
                        !std::is_same<Transport, T>::value, std::ostream&>::type
operator<<(std::ostream& os, const FaceLogHelper<T>& flh)
{
  return os << FaceLogHelper<Transport>(flh.obj);
}

} // namespace face
} // namespace nfd

#endif // NFD_DAEMON_FACE_TRANSPORT_HPP