Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

#include "zbxtrends.h"

#include "trends.h"

​

#include "zbxcommon.h"

#include "zbxstr.h"

​

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

 *                                                                            *

 * Purpose: get baseline data for common period/season combinations           *

 *                                                                            *

 * Parameters: itemid      - [IN] the item identifier                         *

 *             table       - [IN] the trends table name                       *

 *             now         - [IN] the current timestamp                       *

 *             period      - [IN] the data period                             *

 *             season_num  - [IN] the number of seasons                       *

 *             season_unit - [IN] the season time unit                        *

 *             skip        - [IN] how many data periods to skip               *

 *             values      - [OUT] the average data period value in each      *

 *                                 season                                     *

 *             index      - [OUT] the index of returned values, starting      *

 *                                with 0. It will have values be from 0 to    *

 *                                <seasons num> + 1 - <skip> with holes for   *

 *                                periods without data.                       *

 *             error       - [OUT] the error message if parsing failed        *

 *                                                                            *

 * Return value: SUCCEED - data were retrieved successfully                   *

 *               FAIL    - otherwise                                          *

 *                                                                            *

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

static int  baseline_get_common_data(zbx_uint64_t itemid, const char *table, time_t now, const char *period,

        int season_num, zbx_time_unit_t season_unit, int skip, zbx_vector_dbl_t *values,

        zbx_vector_uint64_t *index, char **error)

{

    int         i;

    time_t          start, end;

    double          value_dbl;

    struct tm       tm, tm_now;

​

    tm_now = *localtime(&now);

​

    for (i = 0; i < season_num; i++)

    {

        if (FAIL == zbx_trends_parse_range(now, period, &start, &end, error))

            return FAIL;

​

        if (skip <= i)

        {

            zbx_trend_state_t   state;

​

            state = zbx_trends_get_avg(table, itemid, start, end, &value_dbl);

​

            if (ZBX_TREND_STATE_NORMAL != state)

            {

                if (0 == i || ZBX_TREND_STATE_NODATA != state)

                {

                    *error = zbx_strdup(NULL, zbx_trends_error(state));

                    return FAIL;

                }

            }

            else

            {

                zbx_vector_dbl_append(values, value_dbl);

                zbx_vector_uint64_append(index, (zbx_uint64_t)(i - skip));

            }

        }

​

        tm = tm_now;

        zbx_tm_sub(&tm, i + 1, season_unit);

​

        if (-1 == (now = mktime(&tm)))

        {

            *error = zbx_dsprintf(*error, "cannot convert season start time: %s", zbx_strerror(errno));

            return FAIL;

        }

    }

​

    return SUCCEED;

}