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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LOG_CLOCK_H
#define CEPH_LOG_CLOCK_H
#include <cstdio>
#include <chrono>
#include <ctime>
#include <sys/time.h>
#include "include/ceph_assert.h"
#include "common/ceph_time.h"
#ifndef HAVE_SUSECONDS_T
typedef long suseconds_t;
#endif
namespace ceph {
namespace logging {
namespace _logclock {
// Because the underlying representations of a duration can be any
// arithmetic type we wish, slipping a coarseness tag there is the
// least hacky way to tag them. I'd also considered doing bit-stealing
// and just setting the low bit of the representation unconditionally
// to mark it as fine, BUT that would cut our nanosecond precision in
// half which sort of obviates the point of 'fine'…admittedly real
// computers probably don't care. More to the point it wouldn't be
// durable under arithmetic unless we wrote a whole class to support
// it /anyway/, and if I'm going to do that I may as well add a bool.
// (Yes I know we don't do arithmetic on log timestamps, but I don't
// want everything to suddenly break because someone did something
// that the std::chrono::timepoint contract actually supports.)
struct taggedrep {
uint64_t count;
bool coarse;
explicit taggedrep(uint64_t count) : count(count), coarse(true) {}
taggedrep(uint64_t count, bool coarse) : count(count), coarse(coarse) {}
explicit operator uint64_t() {
return count;
}
};
// Proper significant figure support would be a bit excessive. Also
// we'd have to know the precision of the clocks on Linux and FreeBSD
// and whatever else we want to support.
inline taggedrep operator +(const taggedrep& l, const taggedrep& r) {
return { l.count + r.count, l.coarse || r.coarse };
}
inline taggedrep operator -(const taggedrep& l, const taggedrep& r) {
return { l.count - r.count, l.coarse || r.coarse };
}
inline taggedrep operator *(const taggedrep& l, const taggedrep& r) {
return { l.count * r.count, l.coarse || r.coarse };
}
inline taggedrep operator /(const taggedrep& l, const taggedrep& r) {
return { l.count / r.count, l.coarse || r.coarse };
}
inline taggedrep operator %(const taggedrep& l, const taggedrep& r) {
return { l.count % r.count, l.coarse || r.coarse };
}
// You can compare coarse and fine time. You shouldn't do so in any
// case where ordering actually MATTERS but in practice people won't
// actually ping-pong their logs back and forth between them.
inline bool operator ==(const taggedrep& l, const taggedrep& r) {
return l.count == r.count;
}
inline bool operator !=(const taggedrep& l, const taggedrep& r) {
return l.count != r.count;
}
inline bool operator <(const taggedrep& l, const taggedrep& r) {
return l.count < r.count;
}
inline bool operator <=(const taggedrep& l, const taggedrep& r) {
return l.count <= r.count;
}
inline bool operator >=(const taggedrep& l, const taggedrep& r) {
return l.count >= r.count;
}
inline bool operator >(const taggedrep& l, const taggedrep& r) {
return l.count > r.count;
}
}
class log_clock {
public:
using rep = _logclock::taggedrep;
using period = std::nano;
using duration = std::chrono::duration<rep, period>;
// The second template parameter defaults to the clock's duration
// type.
using time_point = std::chrono::time_point<log_clock>;
static constexpr const bool is_steady = false;
time_point now() noexcept {
return appropriate_now();
}
void coarsen() {
appropriate_now = coarse_now;
}
void refine() {
appropriate_now = fine_now;
}
// Since our formatting is done in microseconds and we're using it
// anyway, we may as well keep this one
static timeval to_timeval(time_point t) {
auto rep = t.time_since_epoch().count();
timespan ts(rep.count);
#ifndef _WIN32
return { static_cast<time_t>(std::chrono::duration_cast<std::chrono::seconds>(ts).count()),
static_cast<suseconds_t>(std::chrono::duration_cast<std::chrono::microseconds>(
ts % std::chrono::seconds(1)).count()) };
#else
return { static_cast<long>(std::chrono::duration_cast<std::chrono::seconds>(ts).count()),
static_cast<long>(std::chrono::duration_cast<std::chrono::microseconds>(
ts % std::chrono::seconds(1)).count()) };
#endif
}
private:
static time_point coarse_now() {
return time_point(
duration(_logclock::taggedrep(coarse_real_clock::now()
.time_since_epoch().count(), true)));
}
static time_point fine_now() {
return time_point(
duration(_logclock::taggedrep(real_clock::now()
.time_since_epoch().count(), false)));
}
time_point(*appropriate_now)() = coarse_now;
};
using log_time = log_clock::time_point;
inline int append_time(const log_time& t, char *out, int outlen) {
bool coarse = t.time_since_epoch().count().coarse;
auto tv = log_clock::to_timeval(t);
std::tm bdt;
time_t t_sec = tv.tv_sec;
localtime_r(&t_sec, &bdt);
char tz[32] = { 0 };
strftime(tz, sizeof(tz), "%z", &bdt);
int r;
if (coarse) {
r = std::snprintf(out, outlen, "%04d-%02d-%02dT%02d:%02d:%02d.%03ld%s",
bdt.tm_year + 1900, bdt.tm_mon + 1, bdt.tm_mday,
bdt.tm_hour, bdt.tm_min, bdt.tm_sec,
static_cast<long>(tv.tv_usec / 1000), tz);
} else {
r = std::snprintf(out, outlen, "%04d-%02d-%02dT%02d:%02d:%02d.%06ld%s",
bdt.tm_year + 1900, bdt.tm_mon + 1, bdt.tm_mday,
bdt.tm_hour, bdt.tm_min, bdt.tm_sec,
static_cast<long>(tv.tv_usec), tz);
}
// Since our caller just adds the return value to something without
// checking it…
ceph_assert(r >= 0);
return r;
}
}
}
#endif
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