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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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 <util/types.h>
#include <chrono>
#include <optional>
#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,
bool msg_on_completion = true)
: m_prefix(std::move(prefix)),
m_title(std::move(end_msg)),
m_log_category(log_category),
m_message_on_completion(msg_on_completion)
{
this->Log(strprintf("%s started", m_title));
m_start_t = std::chrono::steady_clock::now();
}
~Timer()
{
if (m_message_on_completion) {
this->Log(strprintf("%s completed", m_title));
} else {
this->Log("completed");
}
}
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{std::chrono::steady_clock::now()};
if (!m_start_t) {
return strprintf("%s: %s", m_prefix, msg);
}
const auto duration{end_time - *m_start_t};
if constexpr (std::is_same<TimeType, std::chrono::microseconds>::value) {
return strprintf("%s: %s (%iμs)", m_prefix, msg, Ticks<std::chrono::microseconds>(duration));
} else if constexpr (std::is_same<TimeType, std::chrono::milliseconds>::value) {
return strprintf("%s: %s (%.2fms)", m_prefix, msg, Ticks<MillisecondsDouble>(duration));
} else if constexpr (std::is_same<TimeType, std::chrono::seconds>::value) {
return strprintf("%s: %s (%.2fs)", m_prefix, msg, Ticks<SecondsDouble>(duration));
} else {
static_assert(ALWAYS_FALSE<TimeType>, "Error: unexpected time type");
}
}
private:
std::optional<std::chrono::steady_clock::time_point> 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;
//! Whether to output the message again on completion.
const bool m_message_on_completion;
};
} // namespace BCLog
#define LOG_TIME_MICROS_WITH_CATEGORY(end_msg, log_category) \
BCLog::Timer<std::chrono::microseconds> UNIQUE_NAME(logging_timer)(__func__, end_msg, log_category)
#define LOG_TIME_MILLIS_WITH_CATEGORY(end_msg, log_category) \
BCLog::Timer<std::chrono::milliseconds> UNIQUE_NAME(logging_timer)(__func__, end_msg, log_category)
#define LOG_TIME_MILLIS_WITH_CATEGORY_MSG_ONCE(end_msg, log_category) \
BCLog::Timer<std::chrono::milliseconds> UNIQUE_NAME(logging_timer)(__func__, end_msg, log_category, /* msg_on_completion=*/false)
#define LOG_TIME_SECONDS(end_msg) \
BCLog::Timer<std::chrono::seconds> UNIQUE_NAME(logging_timer)(__func__, end_msg)
#endif // BITCOIN_LOGGING_TIMER_H
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