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s3fs-fuse/src/s3fs_logger.h

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/*
* s3fs - FUSE-based file system backed by Amazon S3
*
* Copyright(C) 2007 Randy Rizun <rrizun@gmail.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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef S3FS_LOGGER_H_
#define S3FS_LOGGER_H_
#include <cstdarg>
#include <cstdio>
#include <string>
#include <syslog.h>
#include <sys/time.h>
#include "common.h"
#ifdef CLOCK_MONOTONIC_COARSE
#define S3FS_CLOCK_MONOTONIC CLOCK_MONOTONIC_COARSE
#else
// case of OSX
#define S3FS_CLOCK_MONOTONIC CLOCK_MONOTONIC
#endif
//-------------------------------------------------------------------
// S3fsLog class
//-------------------------------------------------------------------
class S3fsLog
{
public:
enum s3fs_log_level{
LEVEL_CRIT = 0, // LEVEL_CRIT
LEVEL_ERR = 1, // LEVEL_ERR
LEVEL_WARN = 3, // LEVEL_WARNING
LEVEL_INFO = 7, // LEVEL_INFO
LEVEL_DBG = 15 // LEVEL_DEBUG
};
protected:
static constexpr int NEST_MAX = 4;
static constexpr const char* nest_spaces[NEST_MAX] = {"", " ", " ", " "};
static constexpr char LOGFILEENV[] = "S3FS_LOGFILE";
static constexpr char MSGTIMESTAMP[] = "S3FS_MSGTIMESTAMP";
static S3fsLog* pSingleton;
static s3fs_log_level debug_level;
static FILE* logfp;
static std::string logfile;
static bool time_stamp;
protected:
bool LowLoadEnv();
bool LowSetLogfile(const char* pfile);
s3fs_log_level LowSetLogLevel(s3fs_log_level level);
s3fs_log_level LowBumpupLogLevel();
public:
static bool IsS3fsLogLevel(s3fs_log_level level);
static bool IsS3fsLogCrit() { return IsS3fsLogLevel(LEVEL_CRIT); }
static bool IsS3fsLogErr() { return IsS3fsLogLevel(LEVEL_ERR); }
static bool IsS3fsLogWarn() { return IsS3fsLogLevel(LEVEL_WARN); }
static bool IsS3fsLogInfo() { return IsS3fsLogLevel(LEVEL_INFO); }
static bool IsS3fsLogDbg() { return IsS3fsLogLevel(LEVEL_DBG); }
static constexpr int GetSyslogLevel(s3fs_log_level level)
{
return ( LEVEL_DBG == (level & LEVEL_DBG) ? LOG_DEBUG :
LEVEL_INFO == (level & LEVEL_DBG) ? LOG_INFO :
LEVEL_WARN == (level & LEVEL_DBG) ? LOG_WARNING :
LEVEL_ERR == (level & LEVEL_DBG) ? LOG_ERR : LOG_CRIT );
}
static std::string GetCurrentTime();
static constexpr const char* GetLevelString(s3fs_log_level level)
{
return ( LEVEL_DBG == (level & LEVEL_DBG) ? "[DBG] " :
LEVEL_INFO == (level & LEVEL_DBG) ? "[INF] " :
LEVEL_WARN == (level & LEVEL_DBG) ? "[WAN] " :
LEVEL_ERR == (level & LEVEL_DBG) ? "[ERR] " : "[CRT] " );
}
static constexpr const char* GetS3fsLogNest(int nest)
{
return nest_spaces[nest < NEST_MAX ? nest : NEST_MAX - 1];
}
static bool IsSetLogFile()
{
return (nullptr != logfp);
}
static FILE* GetOutputLogFile()
{
return (logfp ? logfp : stdout);
}
static FILE* GetErrorLogFile()
{
return (logfp ? logfp : stderr);
}
static void SeekEnd()
{
if(logfp){
fseek(logfp, 0, SEEK_END);
}
}
static void Flush()
{
if(logfp){
fflush(logfp);
}
}
static bool SetLogfile(const char* pfile);
static bool ReopenLogfile();
static s3fs_log_level SetLogLevel(s3fs_log_level level);
static s3fs_log_level BumpupLogLevel();
static bool SetTimeStamp(bool value);
explicit S3fsLog();
~S3fsLog();
S3fsLog(const S3fsLog&) = delete;
S3fsLog(S3fsLog&&) = delete;
S3fsLog& operator=(const S3fsLog&) = delete;
S3fsLog& operator=(S3fsLog&&) = delete;
};
//-------------------------------------------------------------------
// Debug macros
//-------------------------------------------------------------------
void s3fs_low_logprn(S3fsLog::s3fs_log_level level, const char* file, const char *func, int line, const char *fmt, ...) __attribute__ ((format (printf, 5, 6)));
#define S3FS_LOW_LOGPRN(level, fmt, ...) \
do{ \
s3fs_low_logprn(level, __FILE__, __func__, __LINE__, fmt, ##__VA_ARGS__); \
}while(0)
void s3fs_low_logprn2(S3fsLog::s3fs_log_level level, int nest, const char* file, const char *func, int line, const char *fmt, ...) __attribute__ ((format (printf, 6, 7)));
#define S3FS_LOW_LOGPRN2(level, nest, fmt, ...) \
do{ \
s3fs_low_logprn2(level, nest, __FILE__, __func__, __LINE__, fmt, ##__VA_ARGS__); \
}while(0)
#define S3FS_LOW_CURLDBG(fmt, ...) \
do{ \
if(foreground || S3fsLog::IsSetLogFile()){ \
S3fsLog::SeekEnd(); \
fprintf(S3fsLog::GetOutputLogFile(), "%s[CURL DBG] " fmt "%s\n", S3fsLog::GetCurrentTime().c_str(), __VA_ARGS__); \
S3fsLog::Flush(); \
}else{ \
syslog(S3fsLog::GetSyslogLevel(S3fsLog::LEVEL_CRIT), "%s" fmt "%s", instance_name.c_str(), __VA_ARGS__); \
} \
}while(0)
#define S3FS_LOW_LOGPRN_EXIT(fmt, ...) \
do{ \
if(foreground || S3fsLog::IsSetLogFile()){ \
S3fsLog::SeekEnd(); \
fprintf(S3fsLog::GetErrorLogFile(), "s3fs: " fmt "%s\n", __VA_ARGS__); \
S3fsLog::Flush(); \
}else{ \
fprintf(S3fsLog::GetErrorLogFile(), "s3fs: " fmt "%s\n", __VA_ARGS__); \
syslog(S3fsLog::GetSyslogLevel(S3fsLog::LEVEL_CRIT), "%ss3fs: " fmt "%s", instance_name.c_str(), __VA_ARGS__); \
} \
}while(0)
// Special macro for init message
#define S3FS_PRN_INIT_INFO(fmt, ...) \
do{ \
if(foreground || S3fsLog::IsSetLogFile()){ \
S3fsLog::SeekEnd(); \
fprintf(S3fsLog::GetOutputLogFile(), "%s%s%s%s:%s(%d): " fmt "%s\n", S3fsLog::GetCurrentTime().c_str(), S3fsLog::GetLevelString(S3fsLog::LEVEL_INFO), S3fsLog::GetS3fsLogNest(0), __FILE__, __func__, __LINE__, __VA_ARGS__, ""); \
S3fsLog::Flush(); \
}else{ \
syslog(S3fsLog::GetSyslogLevel(S3fsLog::LEVEL_INFO), "%s%s" fmt "%s", instance_name.c_str(), S3fsLog::GetS3fsLogNest(0), __VA_ARGS__, ""); \
} \
}while(0)
#define S3FS_PRN_LAUNCH_INFO(fmt, ...) \
do{ \
if(foreground || S3fsLog::IsSetLogFile()){ \
S3fsLog::SeekEnd(); \
fprintf(S3fsLog::GetOutputLogFile(), "%s%s" fmt "%s\n", S3fsLog::GetCurrentTime().c_str(), S3fsLog::GetLevelString(S3fsLog::LEVEL_INFO), __VA_ARGS__, ""); \
S3fsLog::Flush(); \
}else{ \
syslog(S3fsLog::GetSyslogLevel(S3fsLog::LEVEL_INFO), "%s" fmt "%s", instance_name.c_str(), __VA_ARGS__, ""); \
} \
}while(0)
// Special macro for checking cache files
#define S3FS_LOW_CACHE(fp, fmt, ...) \
do{ \
if(foreground || S3fsLog::IsSetLogFile()){ \
S3fsLog::SeekEnd(); \
fprintf(fp, fmt "%s\n", __VA_ARGS__); \
S3fsLog::Flush(); \
}else{ \
syslog(S3fsLog::GetSyslogLevel(S3fsLog::LEVEL_INFO), "%s: " fmt "%s", instance_name.c_str(), __VA_ARGS__); \
} \
}while(0)
// [NOTE]
// small trick for VA_ARGS
//
#define S3FS_PRN_EXIT(fmt, ...) S3FS_LOW_LOGPRN_EXIT(fmt, ##__VA_ARGS__, "")
#define S3FS_PRN_CRIT(fmt, ...) S3FS_LOW_LOGPRN(S3fsLog::LEVEL_CRIT, fmt, ##__VA_ARGS__)
#define S3FS_PRN_ERR(fmt, ...) S3FS_LOW_LOGPRN(S3fsLog::LEVEL_ERR, fmt, ##__VA_ARGS__)
#define S3FS_PRN_WARN(fmt, ...) S3FS_LOW_LOGPRN(S3fsLog::LEVEL_WARN, fmt, ##__VA_ARGS__)
#define S3FS_PRN_DBG(fmt, ...) S3FS_LOW_LOGPRN(S3fsLog::LEVEL_DBG, fmt, ##__VA_ARGS__)
#define S3FS_PRN_INFO(fmt, ...) S3FS_LOW_LOGPRN2(S3fsLog::LEVEL_INFO, 0, fmt, ##__VA_ARGS__)
#define S3FS_PRN_INFO1(fmt, ...) S3FS_LOW_LOGPRN2(S3fsLog::LEVEL_INFO, 1, fmt, ##__VA_ARGS__)
#define S3FS_PRN_INFO2(fmt, ...) S3FS_LOW_LOGPRN2(S3fsLog::LEVEL_INFO, 2, fmt, ##__VA_ARGS__)
#define S3FS_PRN_INFO3(fmt, ...) S3FS_LOW_LOGPRN2(S3fsLog::LEVEL_INFO, 3, fmt, ##__VA_ARGS__)
#define S3FS_PRN_CURL(fmt, ...) S3FS_LOW_CURLDBG(fmt, ##__VA_ARGS__, "")
#define S3FS_PRN_CACHE(fp, ...) S3FS_LOW_CACHE(fp, ##__VA_ARGS__, "")
// Macros to print log with fuse context
#define PRINT_FUSE_CTX(level, indent, fmt, ...) do { \
if(S3fsLog::IsS3fsLogLevel(level)){ \
struct fuse_context *ctx = fuse_get_context(); \
if(ctx == NULL){ \
S3FS_LOW_LOGPRN2(level, indent, fmt, ##__VA_ARGS__); \
}else{ \
S3FS_LOW_LOGPRN2(level, indent, fmt"[pid=%u,uid=%u,gid=%u]",\
##__VA_ARGS__, \
(unsigned int)(ctx->pid), \
(unsigned int)(ctx->uid), \
(unsigned int)(ctx->gid)); \
} \
} \
} while (0)
#define FUSE_CTX_INFO(fmt, ...) do { \
PRINT_FUSE_CTX(S3fsLog::LEVEL_INFO, 0, fmt, ##__VA_ARGS__); \
} while (0)
#define FUSE_CTX_INFO1(fmt, ...) do { \
PRINT_FUSE_CTX(S3fsLog::LEVEL_INFO, 1, fmt, ##__VA_ARGS__); \
} while (0)
#define FUSE_CTX_DBG(fmt, ...) do { \
PRINT_FUSE_CTX(S3fsLog::LEVEL_DBG, 0, fmt, ##__VA_ARGS__); \
} while (0)
#endif // S3FS_LOGGER_H_
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: expandtab sw=4 ts=4 fdm=marker
* vim<600: expandtab sw=4 ts=4
*/
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