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110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
#ifndef XRPL_BASICS_CHRONO_H_INCLUDED
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#define XRPL_BASICS_CHRONO_H_INCLUDED
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#include <xrpl/beast/clock/abstract_clock.h>
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#include <xrpl/beast/clock/basic_seconds_clock.h>
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#include <xrpl/beast/clock/manual_clock.h>
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#include <date/date.h>
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#include <chrono>
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#include <cstdint>
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#include <ratio>
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#include <string>
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namespace xrpl {
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// A few handy aliases
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using days = std::chrono::duration<
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int,
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std::ratio_multiply<std::chrono::hours::period, std::ratio<24>>>;
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using weeks = std::chrono::
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duration<int, std::ratio_multiply<days::period, std::ratio<7>>>;
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/** Clock for measuring the network time.
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The epoch is January 1, 2000
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epoch_offset
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= date(2000-01-01) - date(1970-0-01)
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= days(10957)
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= seconds(946684800)
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*/
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constexpr static std::chrono::seconds epoch_offset =
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date::sys_days{date::year{2000} / 1 / 1} -
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date::sys_days{date::year{1970} / 1 / 1};
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static_assert(epoch_offset.count() == 946684800);
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class NetClock
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{
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public:
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explicit NetClock() = default;
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using rep = std::uint32_t;
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using period = std::ratio<1>;
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<NetClock>;
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static bool const is_steady = false;
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};
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template <class Duration>
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std::string
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to_string(date::sys_time<Duration> tp)
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{
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return date::format("%Y-%b-%d %T %Z", tp);
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}
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inline std::string
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to_string(NetClock::time_point tp)
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{
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// 2000-01-01 00:00:00 UTC is 946684800s from 1970-01-01 00:00:00 UTC
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using namespace std::chrono;
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return to_string(
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system_clock::time_point{tp.time_since_epoch() + epoch_offset});
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}
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template <class Duration>
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std::string
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to_string_iso(date::sys_time<Duration> tp)
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{
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using namespace std::chrono;
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return date::format("%FT%TZ", tp);
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}
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inline std::string
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to_string_iso(NetClock::time_point tp)
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{
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// 2000-01-01 00:00:00 UTC is 946684800s from 1970-01-01 00:00:00 UTC
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// Note, NetClock::duration is seconds, as checked by static_assert
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static_assert(std::is_same_v<NetClock::duration::period, std::ratio<1>>);
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return to_string_iso(date::sys_time<NetClock::duration>{
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tp.time_since_epoch() + epoch_offset});
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}
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/** A clock for measuring elapsed time.
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The epoch is unspecified.
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*/
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using Stopwatch = beast::abstract_clock<std::chrono::steady_clock>;
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/** A manual Stopwatch for unit tests. */
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using TestStopwatch = beast::manual_clock<std::chrono::steady_clock>;
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/** Returns an instance of a wall clock. */
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inline Stopwatch&
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stopwatch()
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{
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using Clock = beast::basic_seconds_clock;
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using Facade = Clock::Clock;
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return beast::get_abstract_clock<Facade, Clock>();
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}
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} // namespace xrpl
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#endif
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