1 files changed, 105 insertions, 0 deletions
diff --git a/include/mysql/service_logger.h b/include/mysql/service_logger.h
new file mode 100644
index 00000000..5979901b
--- /dev/null
+++ b/include/mysql/service_logger.h
@@ -0,0 +1,105 @@
+/* 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 MYSQL_SERVICE_LOGGER_INCLUDED
+#define MYSQL_SERVICE_LOGGER_INCLUDED
+
+#ifndef MYSQL_ABI_CHECK
+#include <stdarg.h>
+#endif
+
+/**
+  @file
+  logger service
+
+  Log file with rotation implementation.
+
+  This service implements logging with possible rotation
+  of the log files. Interface intentionally tries to be similar to FILE*
+  related functions.
+
+  So that one can open the log with logger_open(), specifying
+  the limit on the logfile size and the rotations number.
+
+  Then it's possible to write messages to the log with
+  logger_printf or logger_vprintf functions.
+
+  As the size of the logfile grows over the specified limit,
+  it is renamed to 'logfile.1'. The former 'logfile.1' becomes
+  'logfile.2', etc. The file 'logfile.rotations' is removed.
+  That's how the rotation works.
+
+  The rotation can be forced with the logger_rotate() call.
+
+  Finally the log should be closed with logger_close().
+
+@notes:
+  Implementation checks the size of the log file before it starts new
+  printf into it. So the size of the file gets over the limit when it rotates.
+
+  The access is secured with the mutex, so the log is threadsafe.
+*/
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct logger_handle_st LOGGER_HANDLE;
+
+extern struct logger_service_st {
+  void (*logger_init_mutexes)();
+  LOGGER_HANDLE* (*open)(const char *path,
+                         unsigned long long size_limit,
+                         unsigned int rotations);
+  int (*close)(LOGGER_HANDLE *log);
+  int (*vprintf)(LOGGER_HANDLE *log, const char *fmt, va_list argptr);
+  int (*printf)(LOGGER_HANDLE *log, const char *fmt, ...);
+  int (*write)(LOGGER_HANDLE *log, const char *buffer, size_t size);
+  int (*rotate)(LOGGER_HANDLE *log);
+} *logger_service;
+
+#ifdef MYSQL_DYNAMIC_PLUGIN
+
+#define logger_init_mutexes logger_service->logger_init_mutexes
+#define logger_open(path, size_limit, rotations) \
+  (logger_service->open(path, size_limit, rotations))
+#define logger_close(log) (logger_service->close(log))
+#define logger_rotate(log) (logger_service->rotate(log))
+#define logger_vprintf(log, fmt, argptr) (logger_service->\
+    vprintf(log, fmt, argptr))
+#define logger_printf (*logger_service->printf)
+#define logger_write(log, buffer, size) \
+  (logger_service->write(log, buffer, size))
+#else
+
+  void logger_init_mutexes();
+  LOGGER_HANDLE *logger_open(const char *path,
+                             unsigned long long size_limit,
+                             unsigned int rotations);
+  int logger_close(LOGGER_HANDLE *log);
+  int logger_vprintf(LOGGER_HANDLE *log, const char *fmt, va_list argptr);
+  int logger_printf(LOGGER_HANDLE *log, const char *fmt, ...);
+  int logger_write(LOGGER_HANDLE *log, const char *buffer, size_t size);
+  int logger_rotate(LOGGER_HANDLE *log); 
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*MYSQL_SERVICE_LOGGER_INCLUDED*/
+