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/*
* This file is part of PowerDNS or weakforced.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 3 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <iostream>
#include <sstream>
#include <syslog.h>
#include <chrono>
#include <time.h>
#include <iomanip>
/* This file is intended not to be metronome specific, and is simple example of C++2011
variadic templates in action.
The goal is rapid easy to use logging to console & syslog.
Usage:
string address="localhost";
infolog("Bound to %s port %d", address, port);
warnlog("Query took %d milliseconds", 1232.4); // yes, %d
errlog("Unable to bind to %s: %s", ca.toStringWithPort(), strerr(errno));
If bool g_console is true, will log to stdout. Will syslog in any case with LOG_INFO,
LOG_WARNING, LOG_ERR respectively.
More generically, dolog(someiostream, "Hello %s", stream) will log to someiostream
This will happily print a string to %d! Doesn't do further format processing.
*/
inline void dolog(std::ostream& os, const char*s)
{
os<<s;
}
template<typename T, typename... Args>
void dolog(std::ostream& os, const char* s, T value, Args... args)
{
while (*s) {
if (*s == '%') {
if (*(s + 1) == '%') {
++s;
}
else {
os << value;
s += 2;
dolog(os, s, args...);
return;
}
}
os << *s++;
}
}
extern bool g_console;
extern bool g_verbose;
extern bool g_docker;
enum class LogLevel { Emerg=0, Alert, Crit, Err, Warning, Notice, Info, Debug};
extern LogLevel g_loglevel;
template<typename... Args>
void genlog(int level, const char* s, Args... args)
{
using namespace std::chrono;
std::ostringstream str;
dolog(str, s, args...);
syslog(level, "%s", str.str().c_str());
if(g_console && level <= static_cast<int>(g_loglevel)) {
// For docker we include a datetime string
if (g_docker) {
auto now = system_clock::now();
std::time_t ct = system_clock::to_time_t(now);
auto ms = duration_cast<std::chrono::milliseconds>(now.time_since_epoch());
struct tm currentLocalTime;
localtime_r(&ct, ¤tLocalTime);
// The format means that it cannot be longer than 24 bytes (including null byte)
char timebuf[24];
std::strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S", ¤tLocalTime);
std::cout << "[" << timebuf << "," << std::setfill('0') << std::setw(3) << ms.count() % 1000 << "] ";
}
std::cout<<str.str()<<std::endl;
}
}
#define vinfolog if(g_verbose)infolog
template<typename... Args>
void infolog(const char* s, Args... args)
{
genlog(LOG_INFO, s, args...);
}
template<typename... Args>
void noticelog(const char* s, Args... args)
{
genlog(LOG_NOTICE, s, args...);
}
template<typename... Args>
void warnlog(const char* s, Args... args)
{
genlog(LOG_WARNING, s, args...);
}
template<typename... Args>
void errlog(const char* s, Args... args)
{
genlog(LOG_ERR, s, args...);
}
#define vdebuglog if(g_verbose)debuglog
template<typename... Args>
void debuglog(const char* s, Args... args)
{
genlog(LOG_DEBUG, s, args...);
}
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