memgraph/src/utils/timestamp.hpp

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#pragma once
#include <chrono>
#include <ctime>
#include <iomanip>
#include <ostream>
2016-08-02 05:14:09 +08:00
#include <fmt/format.h>
#include "utils/exceptions.hpp"
#include "utils/total_ordering.hpp"
namespace utils {
class TimestampError : public StacktraceException {
public:
using StacktraceException::StacktraceException;
};
class Timestamp : public TotalOrdering<Timestamp> {
public:
Timestamp() : Timestamp(0, 0) {}
Timestamp(std::time_t time, long nsec = 0) : unix_time(time), nsec(nsec) {
auto result = gmtime_r(&time, &this->time);
if (result == nullptr)
throw TimestampError("Unable to construct from {}", time);
}
Timestamp(const Timestamp &) = default;
Timestamp(Timestamp &&) = default;
static Timestamp Now() {
timespec time;
clock_gettime(CLOCK_REALTIME, &time);
return {time.tv_sec, time.tv_nsec};
}
auto SecSinceTheEpoch() const { return unix_time; }
double SecWithNsecSinceTheEpoch() const {
return (double)unix_time + (double)nsec / 1e9;
}
auto NanoSec() const { return nsec; }
long Year() const { return time.tm_year + 1900; }
long Month() const { return time.tm_mon + 1; }
long Day() const { return time.tm_mday; }
long Hour() const { return time.tm_hour; }
long Min() const { return time.tm_min; }
long Sec() const { return time.tm_sec; }
long Usec() const { return nsec / 1000; }
const std::string ToIso8601() const {
return fmt::format(fiso8601, Year(), Month(), Day(), Hour(), Min(), Sec(),
Usec());
}
const std::string ToString(const std::string &format = fiso8601) const {
return fmt::format(format, Year(), Month(), Day(), Hour(), Min(), Sec(),
Usec());
}
friend std::ostream &operator<<(std::ostream &stream, const Timestamp &ts) {
return stream << ts.ToIso8601();
}
operator std::string() const { return ToString(); }
constexpr friend bool operator==(const Timestamp &a, const Timestamp &b) {
return a.unix_time == b.unix_time && a.nsec == b.nsec;
}
constexpr friend bool operator<(const Timestamp &a, const Timestamp &b) {
return a.unix_time < b.unix_time ||
(a.unix_time == b.unix_time && a.nsec < b.nsec);
}
private:
std::tm time;
/** http://en.cppreference.com/w/cpp/chrono/c/time_t */
std::time_t unix_time;
long nsec;
static constexpr auto fiso8601 =
"{:04d}-{:02d}-{:02d}T{:02d}:{:02d}:{:02d}.{:06d}Z";
};
} // namespace utils