time.hpp

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#ifndef NDN_TIME_HPP
#define NDN_TIME_HPP

#include "../common.hpp"
#include <boost/chrono.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>

namespace ndn {
namespace time {

using boost::chrono::duration;

typedef duration<boost::int_least32_t, boost::ratio<86400> > days;
using boost::chrono::hours;
using boost::chrono::minutes;
using boost::chrono::seconds;

using boost::chrono::milliseconds;
using boost::chrono::microseconds;
using boost::chrono::nanoseconds;

using boost::chrono::duration_cast;

class system_clock : public boost::chrono::system_clock
{
public:
  typedef time_point TimePoint;
  typedef duration Duration;

  // /// \brief Get current TimePoint
  // TimePoint
  // now();
}; // class system_clock

class steady_clock : public
#ifdef __APPLE__
// steady_clock may go backwards on OS X platforms, so use system_clock
// instead
    boost::chrono::system_clock
#else
    boost::chrono::steady_clock
#endif
{
public:
  typedef time_point TimePoint;
  typedef duration Duration;

  // /// \brief Get current TimePoint
  // TimePoint
  // now();
}; // class steady_clock


inline const system_clock::TimePoint&
getUnixEpoch()
{
  static system_clock::TimePoint epoch = system_clock::from_time_t(0);
  return epoch;
}

inline milliseconds
toUnixTimestamp(const system_clock::TimePoint& point)
{
  return duration_cast<milliseconds>(point - getUnixEpoch());
}

inline system_clock::TimePoint
fromUnixTimestamp(const milliseconds& duration)
{
  return getUnixEpoch() + duration;
}

inline std::string
toIsoString(const system_clock::TimePoint& timePoint)
{
  namespace bpt = boost::posix_time;
  bpt::ptime ptime = bpt::from_time_t(system_clock::to_time_t(timePoint));

  uint64_t micro = duration_cast<microseconds>(timePoint - getUnixEpoch()).count() % 1000000;
  if (micro > 0)
    {
      ptime += bpt::microseconds(micro);
      return bpt::to_iso_string(ptime);
    }
  else
    return bpt::to_iso_string(ptime);
}

inline system_clock::TimePoint
fromIsoString(const std::string& isoString)
{
  namespace bpt = boost::posix_time;
  static bpt::ptime posixTimeEpoch = bpt::from_time_t(0);

  bpt::ptime ptime = bpt::from_iso_string(isoString);

  system_clock::TimePoint point =
    system_clock::from_time_t((ptime - posixTimeEpoch).total_seconds());
  point += microseconds((ptime - posixTimeEpoch).total_microseconds() % 1000000);
  return point;
}

inline std::string
toString(const system_clock::TimePoint& timePoint,
         const std::string& format = "%Y-%m-%d %H:%M:%S",
         const std::locale& locale = std::locale("C"))
{
  namespace bpt = boost::posix_time;
  bpt::ptime ptime = bpt::from_time_t(system_clock::to_time_t(timePoint));

  uint64_t micro = duration_cast<microseconds>(timePoint - getUnixEpoch()).count() % 1000000;
  ptime += bpt::microseconds(micro);

  bpt::time_facet* facet = new bpt::time_facet(format.c_str());
  std::ostringstream formattedTimePoint;
  formattedTimePoint.imbue(std::locale(locale, facet));
  formattedTimePoint << ptime;

  return formattedTimePoint.str();
}

inline system_clock::TimePoint
fromString(const std::string& formattedTimePoint,
           const std::string& format = "%Y-%m-%d %H:%M:%S",
           const std::locale& locale = std::locale("C"))
{
  namespace bpt = boost::posix_time;
  static bpt::ptime posixTimeEpoch = bpt::from_time_t(0);

  bpt::time_input_facet* facet = new bpt::time_input_facet(format);
  std::istringstream is(formattedTimePoint);

  is.imbue(std::locale(locale, facet));
  bpt::ptime ptime;
  is >> ptime;

  system_clock::TimePoint point =
    system_clock::from_time_t((ptime - posixTimeEpoch).total_seconds());
  point += microseconds((ptime - posixTimeEpoch).total_microseconds() % 1000000);
  return point;
}

} // namespace time
} // namespace ndn

#endif // NDN_TIME_HPP