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-rw-r--r--mysys/file_logger.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/mysys/file_logger.c b/mysys/file_logger.c
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+++ b/mysys/file_logger.c
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+
+#ifndef FLOGGER_SKIP_INCLUDES
+#include "my_global.h"
+#include <my_sys.h>
+#include <m_string.h>
+#include <mysql/service_logger.h>
+#include <my_pthread.h>
+#endif /*FLOGGER_SKIP_INCLUDES*/
+
+#ifndef flogger_mutex_init
+#define flogger_mutex_init(A,B,C) mysql_mutex_init(A,B,C)
+#define flogger_mutex_destroy(A) mysql_mutex_destroy(A)
+#define flogger_mutex_lock(A) mysql_mutex_lock(A)
+#define flogger_mutex_unlock(A) mysql_mutex_unlock(A)
+#endif /*flogger_mutex_init*/
+
+#ifdef HAVE_PSI_INTERFACE
+/* These belong to the service initialization */
+static PSI_mutex_key key_LOCK_logger_service;
+static PSI_mutex_info mutex_list[]=
+{{ &key_LOCK_logger_service, "logger_service_file_st::lock", PSI_FLAG_GLOBAL}};
+#endif
+
+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(PSI_INSTRUMENT_ME,
+ 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;
+ flogger_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;
+ flogger_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;
+
+ if (log->rotations == 0)
+ return 0;
+
+ 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;
+}
+
+
+/*
+ Return 1 if we should rotate the log
+*/
+
+my_bool logger_time_to_rotate(LOGGER_HANDLE *log)
+{
+ my_off_t filesize;
+ if (log->rotations > 0 &&
+ (filesize= my_tell(log->file, MYF(0))) != (my_off_t) -1 &&
+ ((ulonglong) filesize >= log->size_limit))
+ return 1;
+ return 0;
+}
+
+
+int logger_vprintf(LOGGER_HANDLE *log, const char* fmt, va_list ap)
+{
+ int result;
+ char cvtbuf[1024];
+ size_t n_bytes;
+
+ flogger_mutex_lock(&log->lock);
+ if (logger_time_to_rotate(log) && 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= (int)my_write(log->file, (uchar *) cvtbuf, n_bytes, MYF(0));
+
+exit:
+ flogger_mutex_unlock(&log->lock);
+ return result;
+}
+
+
+static int logger_write_r(LOGGER_HANDLE *log, my_bool allow_rotations,
+ const char *buffer, size_t size)
+{
+ int result;
+
+ flogger_mutex_lock(&log->lock);
+ if (allow_rotations && logger_time_to_rotate(log) && do_rotate(log))
+ {
+ result= -1;
+ errno= my_errno;
+ goto exit; /* Log rotation needed but failed */
+ }
+
+ result= (int)my_write(log->file, (uchar *) buffer, size, MYF(0));
+
+exit:
+ flogger_mutex_unlock(&log->lock);
+ return result;
+}
+
+
+int logger_write(LOGGER_HANDLE *log, const char *buffer, size_t size)
+{
+ return logger_write_r(log, TRUE, buffer, size);
+}
+
+int logger_rotate(LOGGER_HANDLE *log)
+{
+ int result;
+ flogger_mutex_lock(&log->lock);
+ result= do_rotate(log);
+ flogger_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;
+}
+
+void logger_init_mutexes()
+{
+#ifdef HAVE_PSI_INTERFACE
+ if (unlikely(PSI_server))
+ PSI_server->register_mutex("sql_logger", mutex_list, 1);
+#endif
+}
+