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.

**/

​

#include "zbxalerter.h"

#include "alerter_defs.h"

​

#include "alerter_protocol.h"

#include "zbxlog.h"

#include "zbxalgo.h"

#include "zbxdb.h"

#include "zbxdbhigh.h"

#include "zbxembed.h"

#include "zbxipcservice.h"

#include "zbxmedia.h"

#include "zbxnix.h"

#include "zbxself.h"

#include "zbxserialize.h"

#include "zbxstr.h"

#include "zbxthreads.h"

#include "zbxtime.h"

#include "zbxtypes.h"

#include "zbxxml.h"

#include "zbxjson.h"

​

#define ZBX_AM_LOCATION_NOWHERE         0

#define ZBX_AM_LOCATION_QUEUE           1

​

#define ZBX_UPDATE_STR(dst, src)                \

    do                          \

    {                           \

        if (NULL == src)                \

            zbx_free(dst);              \

        else if (NULL == dst || 0 != strcmp(dst, src))  \

            dst = zbx_strdup(dst, src);     \

    }                           \

    while(0)

​

#define ALERT_SOURCE_EXTERNAL           0xffff

​

#define ZBX_ALERTPOOL_SOURCE(id)        (id >> 48)

#define ZBX_ALERTPOOL_OBJECT(id)        ((id >> 32) & 0xffff)

​

#define ZBX_AM_MEDIATYPE_FLAG_NONE      0x00

#define ZBX_AM_MEDIATYPE_FLAG_REMOVE        0x01

​

#define ZBX_MEDIA_CONTENT_TYPE_DEFAULT      255

​

/*

 * The alert queue is implemented as a nested queue.

 *

 * At the bottom layer is media type queue, enforcing the media type maxsessions setting.

 * At the next layer is alert pool queue. Alert pool is an artificial construct to group

 * alerts generated by the same source (event source, object and objectid) so that they

 * are executed sequentially.

 * At the top layer is alert queue.

 *

 * mediatypes

 *     alertpools

 *         alerts

 *

 * Media type queue is sorted by the timestamp of the minimum item of its alertpool queue.

 * Alert pool queue is sorted by the timestamp of the minimum item of its alerts queue.

 * Alerts queue is sorted by the alert scheduled send timestamp.

 *

 * When taking the next alert to send the following actions are done:

 *    1) take the next media type object from media type queue

 *    2) take the next alert pool object from media type alertpool queue

 *    3) take the next alert from alert pool alerts queue

 *    4) if media type maxsessions limit has not reached, put the media type object back in queue

 *

 * When processing alert response the following actions are done:

 *    1) find alerts media type and alert pool objects

 *    2) cache alert status update to be flushed into database later

 *    3) if alert failed and can be retried put it back into its alert pool queue,

 *       otherwise free the alert object