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Merge bitcoin/bitcoin#29081: refactor: Remove gmtime*

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fa9f36baba build: Remove HAVE_GMTIME_R (MarcoFalke)
fa72dcbfa5 refactor: FormatISO8601* without gmtime* (MarcoFalke)
fa2c486afc Revert "time: add runtime sanity check" (MarcoFalke)

Pull request description:

  Now that the `ChronoSanityCheck` has passed for everyone with C++17 and is guaranteed by C++20 to always pass, remove it.

  Also, remove `gmtime_r` and `gmtime_s` and replace them with `year_month_day`+`hh_mm_ss` from C++20.

ACKs for top commit:
  sipa:
    utACK fa9f36baba
  fanquake:
    ACK fa9f36baba - more std lib & even less stuff to port.

Tree-SHA512: a9e7e805b757b7dade0bcc3f95273a7dc4f68622630d74838339789dd203ad7542d36b2e090a93b2bc5a7ecc383207dd7ec82c68147108bdac7ce44f088c8c9a
This commit is contained in:
fanquake
2024-04-05 16:56:49 +01:00
parent eb78ebc064 fa9f36baba
commit c3530254c9
6 changed files with 20 additions and 100 deletions
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88
src/util/time.cpp
View File

@@ -3,70 +3,21 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
#include <util/time.h>
#include <compat/compat.h>
#include <tinyformat.h>
#include <util/time.h>
#include <util/check.h>
#include <atomic>
#include <chrono>
#include <ctime>
#include <locale>
#include <thread>
#include <sstream>
#include <string>
#include <thread>
void UninterruptibleSleep(const std::chrono::microseconds& n) { std::this_thread::sleep_for(n); }
static std::atomic<int64_t> nMockTime(0); //!< For testing
bool ChronoSanityCheck()
{
// std::chrono::system_clock.time_since_epoch and time_t(0) are not guaranteed
// to use the Unix epoch timestamp, prior to C++20, but in practice they almost
// certainly will. Any differing behavior will be assumed to be an error, unless
// certain platforms prove to consistently deviate, at which point we'll cope
// with it by adding offsets.
// Create a new clock from time_t(0) and make sure that it represents 0
// seconds from the system_clock's time_since_epoch. Then convert that back
// to a time_t and verify that it's the same as before.
const time_t time_t_epoch{};
auto clock = std::chrono::system_clock::from_time_t(time_t_epoch);
if (std::chrono::duration_cast<std::chrono::seconds>(clock.time_since_epoch()).count() != 0) {
return false;
}
time_t time_val = std::chrono::system_clock::to_time_t(clock);
if (time_val != time_t_epoch) {
return false;
}
// Check that the above zero time is actually equal to the known unix timestamp.
struct tm epoch;
#ifdef HAVE_GMTIME_R
if (gmtime_r(&time_val, &epoch) == nullptr) {
#else
if (gmtime_s(&epoch, &time_val) != 0) {
#endif
return false;
}
if ((epoch.tm_sec != 0) ||
(epoch.tm_min != 0) ||
(epoch.tm_hour != 0) ||
(epoch.tm_mday != 1) ||
(epoch.tm_mon != 0) ||
(epoch.tm_year != 70)) {
return false;
}
return true;
}
NodeClock::time_point NodeClock::now() noexcept
{
const std::chrono::seconds mocktime{nMockTime.load(std::memory_order_relaxed)};
@@ -96,30 +47,21 @@ std::chrono::seconds GetMockTime()
int64_t GetTime() { return GetTime<std::chrono::seconds>().count(); }
std::string FormatISO8601DateTime(int64_t nTime) {
struct tm ts;
time_t time_val = nTime;
#ifdef HAVE_GMTIME_R
if (gmtime_r(&time_val, &ts) == nullptr) {
#else
if (gmtime_s(&ts, &time_val) != 0) {
#endif
return {};
}
return strprintf("%04i-%02i-%02iT%02i:%02i:%02iZ", ts.tm_year + 1900, ts.tm_mon + 1, ts.tm_mday, ts.tm_hour, ts.tm_min, ts.tm_sec);
std::string FormatISO8601DateTime(int64_t nTime)
{
const std::chrono::sys_seconds secs{std::chrono::seconds{nTime}};
const auto days{std::chrono::floor<std::chrono::days>(secs)};
const std::chrono::year_month_day ymd{days};
const std::chrono::hh_mm_ss hms{secs - days};
return strprintf("%04i-%02u-%02uT%02i:%02i:%02iZ", signed{ymd.year()}, unsigned{ymd.month()}, unsigned{ymd.day()}, hms.hours().count(), hms.minutes().count(), hms.seconds().count());
}
std::string FormatISO8601Date(int64_t nTime) {
struct tm ts;
time_t time_val = nTime;
#ifdef HAVE_GMTIME_R
if (gmtime_r(&time_val, &ts) == nullptr) {
#else
if (gmtime_s(&ts, &time_val) != 0) {
#endif
return {};
}
return strprintf("%04i-%02i-%02i", ts.tm_year + 1900, ts.tm_mon + 1, ts.tm_mday);
std::string FormatISO8601Date(int64_t nTime)
{
const std::chrono::sys_seconds secs{std::chrono::seconds{nTime}};
const auto days{std::chrono::floor<std::chrono::days>(secs)};
const std::chrono::year_month_day ymd{days};
return strprintf("%04i-%02u-%02u", signed{ymd.year()}, unsigned{ymd.month()}, unsigned{ymd.day()});
}
struct timeval MillisToTimeval(int64_t nTimeout)

3
src/util/time.h
View File

@@ -116,7 +116,4 @@ struct timeval MillisToTimeval(int64_t nTimeout);
*/
struct timeval MillisToTimeval(std::chrono::milliseconds ms);
/** Sanity check epoch match normal Unix epoch */
bool ChronoSanityCheck();
#endif // BITCOIN_UTIL_TIME_H