95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
#pragma once
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#include <chrono>
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#include <ctime>
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#include <iomanip>
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#include <ostream>
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#include <fmt/format.h>
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#include "utils/exceptions.hpp"
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namespace utils {
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class TimestampError : public StacktraceException {
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public:
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using StacktraceException::StacktraceException;
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};
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class Timestamp final {
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public:
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Timestamp() : Timestamp(0, 0) {}
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Timestamp(std::time_t time, long nsec = 0) : unix_time(time), nsec(nsec) {
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auto result = gmtime_r(&time, &this->time);
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if (result == nullptr) throw TimestampError("Unable to construct from {}", time);
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}
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static Timestamp Now() {
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timespec time;
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clock_gettime(CLOCK_REALTIME, &time);
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return {time.tv_sec, time.tv_nsec};
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}
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auto SecSinceTheEpoch() const { return unix_time; }
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double SecWithNsecSinceTheEpoch() const { return (double)unix_time + (double)nsec / 1e9; }
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auto NanoSec() const { return nsec; }
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long Year() const { return time.tm_year + 1900; }
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long Month() const { return time.tm_mon + 1; }
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long Day() const { return time.tm_mday; }
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long Hour() const { return time.tm_hour; }
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long Min() const { return time.tm_min; }
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long Sec() const { return time.tm_sec; }
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long Usec() const { return nsec / 1000; }
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const std::string ToIso8601() const {
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return fmt::format(fiso8601, Year(), Month(), Day(), Hour(), Min(), Sec(), Usec());
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}
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const std::string ToString(const std::string &format = fiso8601) const {
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return fmt::format(format, Year(), Month(), Day(), Hour(), Min(), Sec(), Usec());
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}
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friend std::ostream &operator<<(std::ostream &stream, const Timestamp &ts) { return stream << ts.ToIso8601(); }
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operator std::string() const { return ToString(); }
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constexpr friend bool operator==(const Timestamp &a, const Timestamp &b) {
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return a.unix_time == b.unix_time && a.nsec == b.nsec;
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}
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constexpr friend bool operator<(const Timestamp &a, const Timestamp &b) {
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return a.unix_time < b.unix_time || (a.unix_time == b.unix_time && a.nsec < b.nsec);
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}
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constexpr friend bool operator!=(const Timestamp &a, const Timestamp &b) { return !(a == b); }
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constexpr friend bool operator<=(const Timestamp &a, const Timestamp &b) { return a < b || a == b; }
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constexpr friend bool operator>(const Timestamp &a, const Timestamp &b) { return !(a <= b); }
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constexpr friend bool operator>=(const Timestamp &a, const Timestamp &b) { return !(a < b); }
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private:
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std::tm time;
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/** http://en.cppreference.com/w/cpp/chrono/c/time_t */
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std::time_t unix_time;
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long nsec;
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static constexpr auto fiso8601 = "{:04d}-{:02d}-{:02d}T{:02d}:{:02d}:{:02d}.{:06d}Z";
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};
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} // namespace utils
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