Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 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.

**/

​

#ifndef ZABBIX_ZBXTRENDS_H

#define ZABBIX_ZBXTRENDS_H

​

#include "zbxeval.h"

#include "zbxtime.h"

​

/* value_avg_t structure is used for item average value trend calculations. */

/*                                                                          */

/* For double values the average value is calculated on the fly with the    */

/* following formula: avg = (dbl * count + value) / (count + 1) and stored  */

/* into dbl member.                                                         */

/* For uint64 values the item values are summed into ui64 member and the    */

/* average value is calculated before flushing trends to database:          */

/* avg = ui64 / count                                                       */

typedef union

{

    double      dbl;

    zbx_uint128_t   ui64;

}

zbx_value_avg_t;

​

typedef struct

{

    zbx_uint64_t        itemid;

    zbx_history_value_t value_min;

    zbx_value_avg_t     value_avg;

    zbx_history_value_t value_max;

    int         clock;

    int         num;

    int         disable_from;

    unsigned char       value_type;

}

ZBX_DC_TREND;

​

int zbx_trends_parse_base(const char *params, zbx_time_unit_t *base, char **error);

int zbx_trends_parse_timeshift(time_t from, const char *timeshift, struct tm *tm, char **error);

​

int zbx_trends_parse_range(time_t from, const char *param, time_t *start, time_t *end, char **error);

int zbx_trends_parse_nextcheck(time_t from, const char *period_shift, time_t *nextcheck, char **error);

​

int zbx_trends_eval_avg(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_count(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_max(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_min(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_sum(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

​

/* trends function cache */

typedef struct

{

    zbx_uint64_t    hits;

    zbx_uint64_t    misses;

    zbx_uint64_t    items_num;

    zbx_uint64_t    requests_num;

}

zbx_tfc_stats_t;

​

int zbx_tfc_init(zbx_uint64_t cache_size, char **error);

void    zbx_tfc_destroy(void);

int zbx_tfc_get_stats(zbx_tfc_stats_t *stats, char **error);

void    zbx_tfc_invalidate_trends(ZBX_DC_TREND *trends, int trends_num);

​

int zbx_baseline_get_data(zbx_uint64_t itemid, unsigned char value_type, 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);

#endif