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s3fs-fuse/src/s3fs_logger.cpp

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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.
*/
#include <cstdlib>
#include <iomanip>
#include <memory>
#include <sstream>
#include <string>
#include "common.h"
#include "s3fs_logger.h"
//-------------------------------------------------------------------
// S3fsLog class : variables
//-------------------------------------------------------------------
constexpr char S3fsLog::LOGFILEENV[];
constexpr const char* S3fsLog::nest_spaces[];
constexpr char S3fsLog::MSGTIMESTAMP[];
S3fsLog* S3fsLog::pSingleton = nullptr;
S3fsLog::s3fs_log_level S3fsLog::debug_level = S3fsLog::LEVEL_CRIT;
FILE* S3fsLog::logfp = nullptr;
std::string S3fsLog::logfile;
bool S3fsLog::time_stamp = true;
//-------------------------------------------------------------------
// S3fsLog class : class methods
//-------------------------------------------------------------------
bool S3fsLog::IsS3fsLogLevel(s3fs_log_level level)
{
return (level == (S3fsLog::debug_level & level));
}
std::string S3fsLog::GetCurrentTime()
{
std::ostringstream current_time;
if(time_stamp){
struct timeval now;
struct timespec tsnow;
struct tm res;
char tmp[32];
if(-1 == clock_gettime(S3FS_CLOCK_MONOTONIC, &tsnow)){
now.tv_sec = tsnow.tv_sec;
now.tv_usec = (tsnow.tv_nsec / 1000);
}else{
gettimeofday(&now, nullptr);
}
strftime(tmp, sizeof(tmp), "%Y-%m-%dT%H:%M:%S", gmtime_r(&now.tv_sec, &res));
current_time << tmp << "." << std::setfill('0') << std::setw(3) << (now.tv_usec / 1000) << "Z ";
}
return current_time.str();
}
bool S3fsLog::SetLogfile(const char* pfile)
{
if(!S3fsLog::pSingleton){
S3FS_PRN_CRIT("S3fsLog::pSingleton is nullptr.");
return false;
}
return S3fsLog::pSingleton->LowSetLogfile(pfile);
}
bool S3fsLog::ReopenLogfile()
{
if(!S3fsLog::pSingleton){
S3FS_PRN_CRIT("S3fsLog::pSingleton is nullptr.");
return false;
}
if(!S3fsLog::logfp){
S3FS_PRN_INFO("Currently the log file is output to stdout/stderr.");
return true;
}
if(!S3fsLog::logfile.empty()){
S3FS_PRN_ERR("There is a problem with the path to the log file being empty.");
return false;
}
std::string tmp = S3fsLog::logfile;
return S3fsLog::pSingleton->LowSetLogfile(tmp.c_str());
}
S3fsLog::s3fs_log_level S3fsLog::SetLogLevel(s3fs_log_level level)
{
if(!S3fsLog::pSingleton){
S3FS_PRN_CRIT("S3fsLog::pSingleton is nullptr.");
return S3fsLog::debug_level; // Although it is an error, it returns the current value.
}
return S3fsLog::pSingleton->LowSetLogLevel(level);
}
S3fsLog::s3fs_log_level S3fsLog::BumpupLogLevel()
{
if(!S3fsLog::pSingleton){
S3FS_PRN_CRIT("S3fsLog::pSingleton is nullptr.");
return S3fsLog::debug_level; // Although it is an error, it returns the current value.
}
return S3fsLog::pSingleton->LowBumpupLogLevel();
}
bool S3fsLog::SetTimeStamp(bool value)
{
bool old = S3fsLog::time_stamp;
S3fsLog::time_stamp = value;
return old;
}
//-------------------------------------------------------------------
// S3fsLog class : methods
//-------------------------------------------------------------------
S3fsLog::S3fsLog()
{
if(!S3fsLog::pSingleton){
S3fsLog::pSingleton = this;
// init syslog(default CRIT)
openlog("s3fs", LOG_PID | LOG_ODELAY | LOG_NOWAIT, LOG_USER);
LowLoadEnv();
}else{
S3FS_PRN_ERR("Already set singleton object for S3fsLog.");
}
}
S3fsLog::~S3fsLog()
{
if(S3fsLog::pSingleton == this){
FILE* oldfp = S3fsLog::logfp;
S3fsLog::logfp = nullptr;
if(oldfp && 0 != fclose(oldfp)){
S3FS_PRN_ERR("Could not close old log file(%s), but continue...", (S3fsLog::logfile.empty() ? S3fsLog::logfile.c_str() : "null"));
}
S3fsLog::logfile.clear();
S3fsLog::pSingleton = nullptr;
S3fsLog::debug_level = S3fsLog::LEVEL_CRIT;
closelog();
}else{
S3FS_PRN_ERR("This object is not singleton S3fsLog object.");
}
}
bool S3fsLog::LowLoadEnv()
{
if(S3fsLog::pSingleton != this){
S3FS_PRN_ERR("This object is not as same as S3fsLog::pSingleton.");
return false;
}
char* pEnvVal;
if(nullptr != (pEnvVal = getenv(S3fsLog::LOGFILEENV))){
if(!SetLogfile(pEnvVal)){
return false;
}
}
if(nullptr != (pEnvVal = getenv(S3fsLog::MSGTIMESTAMP))){
if(0 == strcasecmp(pEnvVal, "true") || 0 == strcasecmp(pEnvVal, "yes") || 0 == strcasecmp(pEnvVal, "1")){
S3fsLog::time_stamp = true;
}else if(0 == strcasecmp(pEnvVal, "false") || 0 == strcasecmp(pEnvVal, "no") || 0 == strcasecmp(pEnvVal, "0")){
S3fsLog::time_stamp = false;
}else{
S3FS_PRN_WARN("Unknown %s environment value(%s) is specified, skip to set time stamp mode.", S3fsLog::MSGTIMESTAMP, pEnvVal);
}
}
return true;
}
bool S3fsLog::LowSetLogfile(const char* pfile)
{
if(S3fsLog::pSingleton != this){
S3FS_PRN_ERR("This object is not as same as S3fsLog::pSingleton.");
return false;
}
if(!pfile){
// close log file if it is opened
if(S3fsLog::logfp && 0 != fclose(S3fsLog::logfp)){
S3FS_PRN_ERR("Could not close log file(%s).", (S3fsLog::logfile.empty() ? S3fsLog::logfile.c_str() : "null"));
return false;
}
S3fsLog::logfp = nullptr;
S3fsLog::logfile.clear();
}else{
// open new log file
//
// [NOTE]
// It will reopen even if it is the same file.
//
FILE* newfp;
if(nullptr == (newfp = fopen(pfile, "a+"))){
S3FS_PRN_ERR("Could not open log file(%s).", pfile);
return false;
}
// switch new log file and close old log file if it is opened
FILE* oldfp = S3fsLog::logfp;
if(oldfp && 0 != fclose(oldfp)){
S3FS_PRN_ERR("Could not close old log file(%s).", (!S3fsLog::logfile.empty() ? S3fsLog::logfile.c_str() : "null"));
fclose(newfp);
return false;
}
S3fsLog::logfp = newfp;
S3fsLog::logfile = pfile;
}
return true;
}
S3fsLog::s3fs_log_level S3fsLog::LowSetLogLevel(s3fs_log_level level)
{
if(S3fsLog::pSingleton != this){
S3FS_PRN_ERR("This object is not as same as S3fsLog::pSingleton.");
return S3fsLog::debug_level; // Although it is an error, it returns the current value.
}
if(level == S3fsLog::debug_level){
return S3fsLog::debug_level;
}
s3fs_log_level old = S3fsLog::debug_level;
S3fsLog::debug_level = level;
setlogmask(LOG_UPTO(GetSyslogLevel(S3fsLog::debug_level)));
S3FS_PRN_CRIT("change debug level from %sto %s", GetLevelString(old), GetLevelString(S3fsLog::debug_level));
return old;
}
S3fsLog::s3fs_log_level S3fsLog::LowBumpupLogLevel()
{
if(S3fsLog::pSingleton != this){
S3FS_PRN_ERR("This object is not as same as S3fsLog::pSingleton.");
return S3fsLog::debug_level; // Although it is an error, it returns the current value.
}
s3fs_log_level old = S3fsLog::debug_level;
S3fsLog::debug_level = ( LEVEL_CRIT == S3fsLog::debug_level ? LEVEL_ERR :
LEVEL_ERR == S3fsLog::debug_level ? LEVEL_WARN :
LEVEL_WARN == S3fsLog::debug_level ? LEVEL_INFO :
LEVEL_INFO == S3fsLog::debug_level ? LEVEL_DBG : LEVEL_CRIT );
setlogmask(LOG_UPTO(GetSyslogLevel(S3fsLog::debug_level)));
S3FS_PRN_CRIT("change debug level from %sto %s", GetLevelString(old), GetLevelString(S3fsLog::debug_level));
return old;
}
void s3fs_low_logprn(S3fsLog::s3fs_log_level level, const char* file, const char *func, int line, const char *fmt, ...)
{
if(S3fsLog::IsS3fsLogLevel(level)){
va_list va;
va_start(va, fmt);
size_t len = vsnprintf(nullptr, 0, fmt, va) + 1;
va_end(va);
std::unique_ptr<char[]> message(new char[len]);
va_start(va, fmt);
vsnprintf(message.get(), len, fmt, va);
va_end(va);
if(foreground || S3fsLog::IsSetLogFile()){
S3fsLog::SeekEnd();
fprintf(S3fsLog::GetOutputLogFile(), "%s%s%s:%s(%d): %s\n", S3fsLog::GetCurrentTime().c_str(), S3fsLog::GetLevelString(level), file, func, line, message.get());
S3fsLog::Flush();
}else{
// TODO: why does this differ from s3fs_low_logprn2?
syslog(S3fsLog::GetSyslogLevel(level), "%s%s:%s(%d): %s", instance_name.c_str(), file, func, line, message.get());
}
}
}
void s3fs_low_logprn2(S3fsLog::s3fs_log_level level, int nest, const char* file, const char *func, int line, const char *fmt, ...)
{
if(S3fsLog::IsS3fsLogLevel(level)){
va_list va;
va_start(va, fmt);
size_t len = vsnprintf(nullptr, 0, fmt, va) + 1;
va_end(va);
std::unique_ptr<char[]> message(new char[len]);
va_start(va, fmt);
vsnprintf(message.get(), len, fmt, va);
va_end(va);
if(foreground || S3fsLog::IsSetLogFile()){
S3fsLog::SeekEnd();
fprintf(S3fsLog::GetOutputLogFile(), "%s%s%s%s:%s(%d): %s\n", S3fsLog::GetCurrentTime().c_str(), S3fsLog::GetLevelString(level), S3fsLog::GetS3fsLogNest(nest), file, func, line, message.get());
S3fsLog::Flush();
}else{
syslog(S3fsLog::GetSyslogLevel(level), "%s%s%s", instance_name.c_str(), S3fsLog::GetS3fsLogNest(nest), message.get());
}
}
}
/*
* 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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