segment-fetcher.hpp

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

#include "../common.hpp"
#include "../face.hpp"

namespace ndn {

class OBufferStream;

namespace util {

class DontVerifySegment
{
public:
  bool
  operator()(const Data& data) const
  {
    return true;
  }
};

class SegmentFetcher : noncopyable
{
public:
  typedef function<void (const ConstBufferPtr& data)> CompleteCallback;
  typedef function<bool (const Data& data)> VerifySegment;
  typedef function<void (uint32_t code, const std::string& msg)> ErrorCallback;

  enum ErrorCode {
    INTEREST_TIMEOUT = 1,
    DATA_HAS_NO_SEGMENT = 2,
    SEGMENT_VERIFICATION_FAIL = 3
  };

  static
  void
  fetch(Face& face,
        const Interest& baseInterest,
        const VerifySegment& verifySegment,
        const CompleteCallback& completeCallback,
        const ErrorCallback& errorCallback);

private:
  SegmentFetcher(Face& face,
                 const VerifySegment& verifySegment,
                 const CompleteCallback& completeCallback,
                 const ErrorCallback& errorCallback);

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

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

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

private:
  Face& m_face;
  VerifySegment m_verifySegment;
  CompleteCallback m_completeCallback;
  ErrorCallback m_errorCallback;

  shared_ptr<OBufferStream> m_buffer;
};

} // util
} // ndn

#endif // NDN_UTIL_SEGMENT_FETCHER_HPP