/usr/include/opendht/log_enable.h is in libopendht-dev 1.2.1~dfsg1-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2016 Savoir-faire Linux Inc.
* Author : Adrien Béraud <adrien.beraud@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "infohash.h"
#ifndef OPENDHT_LOG
#define OPENDHT_LOG true
#endif
namespace dht {
// Logging related utility functions
/**
* Dummy function used to disable logging
*/
inline void NOLOG(char const*, va_list) {}
/**
* Wrapper for logging methods
*/
struct LogMethod {
LogMethod() = default;
template<typename T>
LogMethod(T&& t) : func(std::forward<T>(t)) {}
void operator()(char const* format, ...) const {
va_list args;
va_start(args, format);
func(format, args);
va_end(args);
}
void log(char const* format, va_list args) const {
func(format, args);
}
explicit operator bool() const {
return (bool)func;
}
void logPrintable(const uint8_t *buf, size_t buflen) const {
std::string buf_clean(buflen, '\0');
for (size_t i=0; i<buflen; i++)
buf_clean[i] = isprint(buf[i]) ? buf[i] : '.';
(*this)("%s", buf_clean.c_str());
}
private:
std::function<void(char const*, va_list)> func;
};
struct Logger {
LogMethod DEBUG = NOLOG;
LogMethod WARN = NOLOG;
LogMethod ERR = NOLOG;
void setFilter(const InfoHash& f) {
filter_ = f;
filterEnable_ = filter_ != InfoHash{};
}
inline void log0(const LogMethod& logger, char const* format, va_list args) const {
#if OPENDHT_LOG
if (logger and not filterEnable_)
logger.log(format, args);
#endif
}
inline void log1(const LogMethod& logger, const InfoHash& f, char const* format, va_list args) const {
#if OPENDHT_LOG
if (logger and (not filterEnable_ or f == filter_))
logger.log(format, args);
#endif
}
inline void log2(const LogMethod& logger, const InfoHash& f1, const InfoHash& f2, char const* format, va_list args) const {
#if OPENDHT_LOG
if (logger and (not filterEnable_ or f1 == filter_ or f2 == filter_))
logger.log(format, args);
#endif
}
inline void d(char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log0(DEBUG, format, args);
va_end(args);
#endif
}
inline void d(const InfoHash& f, char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log1(DEBUG, f, format, args);
va_end(args);
#endif
}
inline void d(const InfoHash& f1, const InfoHash& f2, char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log2(DEBUG, f1, f2, format, args);
va_end(args);
#endif
}
inline void w(char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log0(WARN, format, args);
va_end(args);
#endif
}
inline void w(const InfoHash& f, char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log1(WARN, f, format, args);
va_end(args);
#endif
}
inline void w(const InfoHash& f1, const InfoHash& f2, char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log2(WARN, f1, f2, format, args);
va_end(args);
#endif
}
inline void e(char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log0(ERR, format, args);
va_end(args);
#endif
}
inline void e(const InfoHash& f, char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log1(ERR, f, format, args);
va_end(args);
#endif
}
inline void e(const InfoHash& f1, const InfoHash& f2, char const* format, ...) const {
#if OPENDHT_LOG
va_list args;
va_start(args, format);
log2(ERR, f1, f2, format, args);
va_end(args);
#endif
}
private:
bool filterEnable_ {false};
InfoHash filter_ {};
};
}
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