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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_LOGGING_TIMER_H
#define BITCOIN_LOGGING_TIMER_H
#include <logging.h>
#include <util/macros.h>
#include <util/time.h>
#include <chrono>
#include <string>
namespace BCLog {
//! RAII-style object that outputs timing information to logs.
template <typename TimeType>
class Timer
{
public:
//! If log_category is left as the default, end_msg will log unconditionally
//! (instead of being filtered by category).
Timer(
std::string prefix,
std::string end_msg,
BCLog::LogFlags log_category = BCLog::LogFlags::ALL) :
m_prefix(std::move(prefix)),
m_title(std::move(end_msg)),
m_log_category(log_category)
{
this->Log(strprintf("%s started", m_title));
m_start_t = GetTime<std::chrono::microseconds>();
}
~Timer()
{
this->Log(strprintf("%s completed", m_title));
}
void Log(const std::string& msg)
{
const std::string full_msg = this->LogMsg(msg);
if (m_log_category == BCLog::LogFlags::ALL) {
LogPrintf("%s\n", full_msg);
} else {
LogPrint(m_log_category, "%s\n", full_msg);
}
}
std::string LogMsg(const std::string& msg)
{
const auto end_time = GetTime<std::chrono::microseconds>() - m_start_t;
if (m_start_t.count() <= 0) {
return strprintf("%s: %s", m_prefix, msg);
}
std::string units = "";
float divisor = 1;
if (std::is_same<TimeType, std::chrono::microseconds>::value) {
units = "μs";
} else if (std::is_same<TimeType, std::chrono::milliseconds>::value) {
units = "ms";
divisor = 1000.;
} else if (std::is_same<TimeType, std::chrono::seconds>::value) {
units = "s";
divisor = 1000. * 1000.;
}
const float time_ms = end_time.count() / divisor;
return strprintf("%s: %s (%.2f%s)", m_prefix, msg, time_ms, units);
}
private:
std::chrono::microseconds m_start_t{};
//! Log prefix; usually the name of the function this was created in.
const std::string m_prefix{};
//! A descriptive message of what is being timed.
const std::string m_title{};
//! Forwarded on to LogPrint if specified - has the effect of only
//! outputting the timing log when a particular debug= category is specified.
const BCLog::LogFlags m_log_category{};
};
} // namespace BCLog
#define LOG_TIME_MICROS(end_msg, ...) \
BCLog::Timer<std::chrono::microseconds> PASTE2(logging_timer, __COUNTER__)(__func__, end_msg, ## __VA_ARGS__)
#define LOG_TIME_MILLIS(end_msg, ...) \
BCLog::Timer<std::chrono::milliseconds> PASTE2(logging_timer, __COUNTER__)(__func__, end_msg, ## __VA_ARGS__)
#define LOG_TIME_SECONDS(end_msg, ...) \
BCLog::Timer<std::chrono::seconds> PASTE2(logging_timer, __COUNTER__)(__func__, end_msg, ## __VA_ARGS__)
#endif // BITCOIN_LOGGING_TIMER_H
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