Zabbix

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** 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 "common.h"

#include "log.h"

​

/* LIBXML2 is used */

#ifdef HAVE_LIBXML2

#   include <libxml/parser.h>

#   include <libxml/tree.h>

#   include <libxml/xpath.h>

#endif

​

#include "zbxregexp.h"

#include "zbxjson.h"

#include "zbxembed.h"

#include "zbxprometheus.h"

#include "preproc_history.h"

​

#include "item_preproc.h"

​

extern zbx_es_t es_engine;

​

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

 *                                                                            *

 * Function: item_preproc_numeric_type_hint                                   *

 *                                                                            *

 * Purpose: returns numeric type hint based on item value type                *

 *                                                                            *

 * Parameters: value_type - [IN] the item value type                          *

 *                                                                            *

 * Return value: variant numeric type or none                                 *

 *                                                                            *

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

static int  item_preproc_numeric_type_hint(unsigned char value_type)

{

    switch (value_type)

    {

        case ITEM_VALUE_TYPE_FLOAT:

            return ZBX_VARIANT_DBL;

        case ITEM_VALUE_TYPE_UINT64:

            return ZBX_VARIANT_UI64;

        default:

            return ZBX_VARIANT_NONE;

    }

}

​

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

 *                                                                            *

 * Function: item_preproc_convert_value                                       *

 *                                                                            *

 * Purpose: convert variant value to the requested type                       *

 *                                                                            *

 * Parameters: value  - [IN/OUT] the value to convert                         *

 *             type   - [IN] the new value type                               *

 *             errmsg - [OUT] error message                                   *

 *                                                                            *

 * Return value: SUCCEED - the value was converted successfully               *

 *               FAIL - otherwise, errmsg contains the error message          *

 *                                                                            *

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

static int  item_preproc_convert_value(zbx_variant_t *value, unsigned char type, char **errmsg)

{

    if (FAIL == zbx_variant_convert(value, type))

    {

        *errmsg = zbx_dsprintf(*errmsg, "cannot convert value to %s", zbx_get_variant_type_desc(type));

        return FAIL;

    }

​

    return SUCCEED;

}

​

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

 *                                                                            *

 * Function: zbx_item_preproc_convert_value_to_numeric                        *