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/* Copyright (C) 2012 Monty Program Ab
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; version 2 of the License.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "my_global.h"
#include <my_sys.h>
#include <mysql/service_logger.h>
extern char *mysql_data_home;
extern PSI_mutex_key key_LOCK_logger_service;
typedef struct logger_handle_st {
File file;
char path[FN_REFLEN];
unsigned long long size_limit;
unsigned int rotations;
size_t path_len;
mysql_mutex_t lock;
} LSFS;
#define LOG_FLAGS (O_APPEND | O_CREAT | O_WRONLY)
static unsigned int n_dig(unsigned int i)
{
return (i == 0) ? 0 : ((i < 10) ? 1 : ((i < 100) ? 2 : 3));
}
LOGGER_HANDLE *logger_open(const char *path,
unsigned long long size_limit,
unsigned int rotations)
{
LOGGER_HANDLE new_log, *l_perm;
/*
I don't think we ever need more rotations,
but if it's so, the rotation procedure should be adapted to it.
*/
if (rotations > 999)
return 0;
new_log.rotations= rotations;
new_log.size_limit= size_limit;
new_log.path_len= strlen(fn_format(new_log.path, path,
mysql_data_home, "", MY_UNPACK_FILENAME));
if (new_log.path_len+n_dig(rotations)+1 > FN_REFLEN)
{
errno= ENAMETOOLONG;
/* File path too long */
return 0;
}
if ((new_log.file= my_open(new_log.path, LOG_FLAGS, MYF(0))) < 0)
{
errno= my_errno;
/* Check errno for the cause */
return 0;
}
if (!(l_perm= (LOGGER_HANDLE *) my_malloc(sizeof(LOGGER_HANDLE), MYF(0))))
{
my_close(new_log.file, MYF(0));
new_log.file= -1;
return 0; /* End of memory */
}
*l_perm= new_log;
mysql_mutex_init(key_LOCK_logger_service, &l_perm->lock, MY_MUTEX_INIT_FAST);
return l_perm;
}
int logger_close(LOGGER_HANDLE *log)
{
int result;
File file= log->file;
mysql_mutex_destroy(&log->lock);
my_free(log);
if ((result= my_close(file, MYF(0))))
errno= my_errno;
return result;
}
static char *logname(LOGGER_HANDLE *log, char *buf, unsigned int n_log)
{
sprintf(buf+log->path_len, ".%0*u", n_dig(log->rotations), n_log);
return buf;
}
static int do_rotate(LOGGER_HANDLE *log)
{
char namebuf[FN_REFLEN];
int result;
unsigned int i;
char *buf_old, *buf_new, *tmp;
memcpy(namebuf, log->path, log->path_len);
buf_new= logname(log, namebuf, log->rotations);
buf_old= log->path;
for (i=log->rotations-1; i>0; i--)
{
logname(log, buf_old, i);
if (!access(buf_old, F_OK) &&
(result= my_rename(buf_old, buf_new, MYF(0))))
goto exit;
tmp= buf_old;
buf_old= buf_new;
buf_new= tmp;
}
if ((result= my_close(log->file, MYF(0))))
goto exit;
namebuf[log->path_len]= 0;
result= my_rename(namebuf, logname(log, log->path, 1), MYF(0));
log->file= my_open(namebuf, LOG_FLAGS, MYF(0));
exit:
errno= my_errno;
return log->file < 0 || result;
}
int logger_vprintf(LOGGER_HANDLE *log, const char* fmt, va_list ap)
{
int result;
my_off_t filesize;
char cvtbuf[1024];
size_t n_bytes;
mysql_mutex_lock(&log->lock);
if ((filesize= my_tell(log->file, MYF(0))) == (my_off_t) -1 ||
((unsigned long long)filesize >= log->size_limit &&
do_rotate(log)))
{
result= -1;
errno= my_errno;
goto exit; /* Log rotation needed but failed */
}
n_bytes= my_vsnprintf(cvtbuf, sizeof(cvtbuf), fmt, ap);
if (n_bytes >= sizeof(cvtbuf))
n_bytes= sizeof(cvtbuf) - 1;
result= my_write(log->file, (uchar *) cvtbuf, n_bytes, MYF(0));
exit:
mysql_mutex_unlock(&log->lock);
return result;
}
int logger_rotate(LOGGER_HANDLE *log)
{
int result;
mysql_mutex_lock(&log->lock);
result= do_rotate(log);
mysql_mutex_unlock(&log->lock);
return result;
}
int logger_printf(LOGGER_HANDLE *log, const char *fmt, ...)
{
int result;
va_list args;
va_start(args,fmt);
result= logger_vprintf(log, fmt, args);
va_end(args);
return result;
}
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