chrono.h

#pragma once
 
#include <xrpl/beast/clock/abstract_clock.h>
#include <xrpl/beast/clock/basic_seconds_clock.h>
#include <xrpl/beast/clock/manual_clock.h>
 
#include <date/date.h>
 
#include <chrono>
#include <cstdint>
#include <ratio>
#include <string>
 
namespace xrpl {
 
// A few handy aliases
 
using days =
    std::chrono::duration<int, std::ratio_multiply<std::chrono::hours::period, std::ratio<24>>>;
 
using weeks = std::chrono::duration<int, std::ratio_multiply<days::period, std::ratio<7>>>;
 
constexpr static std::chrono::seconds epoch_offset =
    date::sys_days{date::year{2000} / 1 / 1} - date::sys_days{date::year{1970} / 1 / 1};
 
static_assert(epoch_offset.count() == 946684800);
 
class NetClock
{
public:
    explicit NetClock() = default;
 
    using rep = std::uint32_t;
    using period = std::ratio<1>;
    using duration = std::chrono::duration<rep, period>;
    using time_point = std::chrono::time_point<NetClock>;
 
    static bool const is_steady = false;
};
 
template <class Duration>
std::string
to_string(date::sys_time<Duration> tp)
{
    return date::format("%Y-%b-%d %T %Z", tp);
}
 
inline std::string
to_string(NetClock::time_point tp)
{
    // 2000-01-01 00:00:00 UTC is 946684800s from 1970-01-01 00:00:00 UTC
    using namespace std::chrono;
    return to_string(system_clock::time_point{tp.time_since_epoch() + epoch_offset});
}
 
template <class Duration>
std::string
to_string_iso(date::sys_time<Duration> tp)
{
    using namespace std::chrono;
    return date::format("%FT%TZ", tp);
}
 
inline std::string
to_string_iso(NetClock::time_point tp)
{
    // 2000-01-01 00:00:00 UTC is 946684800s from 1970-01-01 00:00:00 UTC
    // Note, NetClock::duration is seconds, as checked by static_assert
    static_assert(std::is_same_v<NetClock::duration::period, std::ratio<1>>);
    return to_string_iso(date::sys_time<NetClock::duration>{tp.time_since_epoch() + epoch_offset});
}
 
using Stopwatch = beast::abstract_clock<std::chrono::steady_clock>;
 
using TestStopwatch = beast::manual_clock<std::chrono::steady_clock>;
 
inline Stopwatch&
stopwatch()
{
    using Clock = beast::basic_seconds_clock;
    using Facade = Clock::Clock;
    return beast::get_abstract_clock<Facade, Clock>();
}
 
}  // namespace xrpl