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/*
* Copyright (C) 2018-2019 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib 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 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef WSREP_LOGGER_HPP
#define WSREP_LOGGER_HPP
#include "mutex.hpp"
#include "lock.hpp"
#include "atomic.hpp"
#include <iosfwd>
#include <sstream>
#define WSREP_LOG_DEBUG(debug_level_fn, debug_level, msg) \
do { \
if (debug_level_fn >= debug_level) wsrep::log_debug() << msg; \
} while (0)
namespace wsrep
{
class log
{
public:
enum level
{
debug,
info,
warning,
error,
unknown
};
enum debug_level
{
debug_level_server_state = 1,
debug_level_transaction,
debug_level_streaming,
debug_level_client_state
};
/**
* Signature for user defined logger callback function.
*
* @param pfx optional internally defined prefix for the message
* @param msg message to log
*/
typedef void (*logger_fn_type)(level l,
const char* pfx, const char* msg);
static const char* to_c_string(enum level level)
{
switch (level)
{
case debug: return "debug";
case info: return "info";
case warning: return "warning";
case error: return "error";
case unknown: break;
};
return "unknown";
}
log(enum wsrep::log::level level, const char* prefix = "L:")
: level_(level)
, prefix_(prefix)
, oss_()
{ }
~log()
{
if (logger_fn_)
{
logger_fn_(level_, prefix_, oss_.str().c_str());
}
else
{
wsrep::unique_lock<wsrep::mutex> lock(mutex_);
os_ << prefix_ << oss_.str() << std::endl;
}
}
template <typename T>
std::ostream& operator<<(const T& val)
{
return (oss_ << val);
}
/**
* Set user defined logger callback function.
*/
static void logger_fn(logger_fn_type);
/**
* Set debug log level from client
*/
static void debug_log_level(int debug_level);
/**
* Get current debug log level
*/
static int debug_log_level();
private:
log(const log&);
log& operator=(const log&);
enum level level_;
const char* prefix_;
std::ostringstream oss_;
static wsrep::mutex& mutex_;
static std::ostream& os_;
static logger_fn_type logger_fn_;
static std::atomic_int debug_log_level_;
};
class log_error : public log
{
public:
log_error()
: log(error) { }
};
class log_warning : public log
{
public:
log_warning()
: log(warning) { }
};
class log_info : public log
{
public:
log_info()
: log(info) { }
};
class log_debug : public log
{
public:
log_debug()
: log(debug) { }
};
}
#endif // WSREP_LOGGER_HPP
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