/***********************************************************************
Copyright (c) 2009 Innobase Oy. All rights reserved.
Copyright (c) 2009 Oracle. All rights reserved.

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

************************************************************************/

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#include "univ.i"
#include "srv0srv.h"
#include "api0api.h"
#include "api0ucode.h"

/** InnoDB status variables types. */
typedef enum {
	IB_STATUS_IBOOL,		/*!< Boolean status variable, ibool */
	IB_STATUS_I64,			/*!< ib_int64_t status variable */
	IB_STATUS_ULINT			/*!< uling status variable */
} ib_status_type_t;

/** InnoDB status variables */
typedef struct {
	const char*		name;	/*!< Status variable name */

	ib_status_type_t	type;	/*!< Status varable type */

	const void*		val;	/*!< Pointer to status value */
} ib_status_t;

/* All status variables that a user can query. */
UNIV_STATIC const ib_status_t status_vars[] = {
	/* IO system related */
	{"read_req_pending",		IB_STATUS_ULINT,
		&export_vars.innodb_data_pending_reads},

	{"write_req_pending",		IB_STATUS_ULINT,
		&export_vars.innodb_data_pending_writes},

	{"fsync_req_pending",		IB_STATUS_ULINT,
		&export_vars.innodb_data_pending_fsyncs},

	{"write_req_done",		IB_STATUS_ULINT,
		&export_vars.innodb_data_writes},

	{"read_req_done",		IB_STATUS_ULINT,
		&export_vars.innodb_data_reads},

	{"fsync_req_done",		IB_STATUS_ULINT,
		&export_vars.innodb_data_fsyncs},

	{"bytes_total_written",		IB_STATUS_ULINT,
		&export_vars.innodb_data_written},

	{"bytes_total_read",		IB_STATUS_ULINT,
		&export_vars.innodb_data_read},


	/* Buffer pool related */
	{"buffer_pool_current_size",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_pages_total},

	{"buffer_pool_data_pages",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_pages_data},

	{"buffer_pool_dirty_pages",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_pages_dirty},

	{"buffer_pool_misc_pages",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_pages_misc},

	{"buffer_pool_free_pages",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_pages_free},

	{"buffer_pool_read_reqs",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_read_requests},

	{"buffer_pool_reads",		IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_reads},

	{"buffer_pool_waited_for_free",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_wait_free},

	{"buffer_pool_pages_flushed",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_pages_flushed},

	{"buffer_pool_write_reqs",	IB_STATUS_ULINT,
		&export_vars.innodb_buffer_pool_write_requests},

	{"buffer_pool_total_pages",	IB_STATUS_ULINT,
		&export_vars.innodb_pages_created},

	{"buffer_pool_pages_read",	IB_STATUS_ULINT,
		&export_vars.innodb_pages_read},

	{"buffer_pool_pages_written",	IB_STATUS_ULINT,
		&export_vars.innodb_pages_written},


	/* Double write buffer related */
	{"double_write_pages_written",	IB_STATUS_ULINT,
		&export_vars.innodb_dblwr_pages_written},

	{"double_write_invoked",	IB_STATUS_ULINT,
		&export_vars.innodb_dblwr_writes},


	/* Log related */
	{"log_buffer_slot_waits",	IB_STATUS_ULINT,
		&export_vars.innodb_log_waits},

	{"log_write_reqs",		IB_STATUS_ULINT,
		&export_vars.innodb_log_write_requests},

	{"log_write_flush_count",	IB_STATUS_ULINT,
		&export_vars.innodb_log_writes},

	{"log_bytes_written",		IB_STATUS_ULINT,
		&export_vars.innodb_os_log_written},

	{"log_fsync_req_done",		IB_STATUS_ULINT,
		&export_vars.innodb_os_log_fsyncs},

	{"log_write_req_pending",	IB_STATUS_ULINT,
		&export_vars.innodb_os_log_pending_writes},

	{"log_fsync_req_pending",	IB_STATUS_ULINT,
		&export_vars.innodb_os_log_pending_fsyncs},


	/* Lock related */
	{"lock_row_waits",		IB_STATUS_ULINT,
		&export_vars.innodb_row_lock_waits},

	{"lock_row_waiting",		IB_STATUS_ULINT,
		&export_vars.innodb_row_lock_current_waits},

	{"lock_total_wait_time_in_secs",IB_STATUS_ULINT,
		&export_vars.innodb_row_lock_time},

	{"lock_wait_time_avg_in_secs",	IB_STATUS_ULINT,
		&export_vars.innodb_row_lock_time_avg},

	{"lock_max_wait_time_in_secs",IB_STATUS_ULINT,
		&export_vars.innodb_row_lock_time_max},


	/* Row operations */
	{"row_total_read",		IB_STATUS_ULINT,
		&export_vars.innodb_rows_read},
	{"row_total_inserted",		IB_STATUS_ULINT,
		&export_vars.innodb_rows_inserted},
	{"row_total_updated",		IB_STATUS_ULINT,
		&export_vars.innodb_rows_updated},
	{"row_total_deleted",		IB_STATUS_ULINT,
		&export_vars.innodb_rows_deleted},

	/* Miscellaneous */
	{"page_size",			IB_STATUS_ULINT,
		&export_vars.innodb_page_size},

	{"have_atomic_builtins",	IB_STATUS_IBOOL,
		&export_vars.innodb_have_atomic_builtins},

	{ NULL, 0, 0}};

/*******************************************************************//*
Get the status variable that matches name.

@return DB_SUCCESS if found else DB_NOT_FOUND */
UNIV_STATIC
ib_err_t
ib_status_lookup(
/*=============*/
	const char*	name,		/*!< in: Variable to lookup */
	const ib_status_t** var)	/*!< out: pointer to entry */
{
	const ib_status_t*	ptr;

	*var = NULL;

	for (ptr = status_vars; ptr && ptr->name != NULL; ++ptr) {
		if (ib_utf8_strcasecmp(name, ptr->name) == 0) {
			*var = ptr;
			return(DB_SUCCESS);
		}
	}

	return(DB_NOT_FOUND);
}

/*******************************************************************//**
Get the value of an INT status variable.
@file api/api0status.c

@return	DB_SUCCESS if found and type is INT,
	DB_DATA_MISMATCH if found but type is not INT,
	DB_NOT_FOUND otherwise. */

ib_err_t
ib_status_get_i64(
/*==============*/
	const char*	name,		/*!< in: Status variable name */
	ib_i64_t*	dst)		/*!< out: Variable value */
{
	ib_err_t	err;
	const ib_status_t*	var;

	err = ib_status_lookup(name, &var);

	if (err == DB_SUCCESS) {

		/* Read the latest values into export_vars. */
		srv_export_innodb_status();

		switch (var->type) {
		case IB_STATUS_ULINT:
			*dst = *(ulint*) var->val;
			break;

		case IB_STATUS_IBOOL:
			*dst = *(ibool*) var->val;
			break;

		case IB_STATUS_I64:
			*dst = *(ib_int64_t*) var->val;
			break;

		default:
			/* Currently the status variables are all INTs. If
			we add other types then this will signal to the user
			that the variable type is different. */	
			err = DB_DATA_MISMATCH;
			break;
		}
	}

	return(err);
}