segment-fetcher.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2018 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library 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 Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 */

#ifndef NDN_UTIL_SEGMENT_FETCHER_HPP
#define NDN_UTIL_SEGMENT_FETCHER_HPP

#include "../common.hpp"
#include "../face.hpp"
#include "../security/v2/validator.hpp"
#include "scheduler.hpp"
#include "signal.hpp"

namespace ndn {

class OBufferStream;

namespace util {

class SegmentFetcher : noncopyable
{
public:
  static const uint32_t MAX_INTEREST_REEXPRESS;

  typedef function<void (const ConstBufferPtr& data)> CompleteCallback;
  typedef function<void (uint32_t code, const std::string& msg)> ErrorCallback;

  enum ErrorCode {
    INTEREST_TIMEOUT = 1,
    DATA_HAS_NO_SEGMENT = 2,
    SEGMENT_VALIDATION_FAIL = 3,
    NACK_ERROR = 4
  };

  static
  shared_ptr<SegmentFetcher>
  fetch(Face& face,
        const Interest& baseInterest,
        security::v2::Validator& validator,
        const CompleteCallback& completeCallback,
        const ErrorCallback& errorCallback);

  static
  shared_ptr<SegmentFetcher>
  fetch(Face& face,
        const Interest& baseInterest,
        shared_ptr<security::v2::Validator> validator,
        const CompleteCallback& completeCallback,
        const ErrorCallback& errorCallback);

private:
  SegmentFetcher(Face& face,
                 shared_ptr<security::v2::Validator> validator,
                 const CompleteCallback& completeCallback,
                 const ErrorCallback& errorCallback);

  void
  fetchFirstSegment(const Interest& baseInterest, shared_ptr<SegmentFetcher> self);

  void
  fetchNextSegment(const Interest& origInterest, const Name& dataName, uint64_t segmentNo,
                   shared_ptr<SegmentFetcher> self);

  void
  afterSegmentReceivedCb(const Interest& origInterest,
                         const Data& data, bool isSegmentZeroExpected,
                         shared_ptr<SegmentFetcher> self);
  void
  afterValidationSuccess(const Data& data,
                         bool isSegmentZeroExpected,
                         const Interest& origInterest,
                         shared_ptr<SegmentFetcher> self);

  void
  afterValidationFailure(const Data& data, const security::v2::ValidationError& error);

  void
  afterNackReceivedCb(const Interest& origInterest, const lp::Nack& nack,
                      uint32_t reExpressCount, shared_ptr<SegmentFetcher> self);

  void
  reExpressInterest(Interest interest, uint32_t reExpressCount,
                    shared_ptr<SegmentFetcher> self);

public:
  Signal<SegmentFetcher, Data> afterSegmentReceived;

  Signal<SegmentFetcher, Data> afterSegmentValidated;

private:
  Face& m_face;
  Scheduler m_scheduler;
  shared_ptr<security::v2::Validator> m_validator;
  CompleteCallback m_completeCallback;
  ErrorCallback m_errorCallback;

  shared_ptr<OBufferStream> m_buffer;
};

} // namespace util
} // namespace ndn

#endif // NDN_UTIL_SEGMENT_FETCHER_HPP