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/*
** Zabbix
** Copyright (C) 2001-2019 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 "db.h"
#include "log.h"
#include "daemon.h"
#include "zbxself.h"
#include "dbcache.h"
#include "housekeeper.h"
extern unsigned char process_type, program_type;
extern int server_num, process_num;
static int hk_period;
/* the maximum number of housekeeping periods to be removed per single housekeeping cycle */
#define HK_MAX_DELETE_PERIODS 4
static void zbx_housekeeper_sigusr_handler(int flags)
{
if (ZBX_RTC_HOUSEKEEPER_EXECUTE == ZBX_RTC_GET_MSG(flags))
{
if (0 < zbx_sleep_get_remainder())
{
zabbix_log(LOG_LEVEL_WARNING, "forced execution of the housekeeper");
zbx_wakeup();
}
else
zabbix_log(LOG_LEVEL_WARNING, "housekeeping procedure is already in progress");
}
}
/******************************************************************************
* *
* Function: delete_history *
* *
* Purpose: remove outdated information from historical table *
* *
* Parameters: now - current timestamp *
* *
* Return value: number of rows records *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static int delete_history(const char *table, const char *fieldname, int now)
{
const char *__function_name = "delete_history";
DB_RESULT result;
DB_ROW row;
int minclock, records = 0;
zbx_uint64_t lastid, maxid;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() table:'%s' now:%d",
__function_name, table, now);
DBbegin();
result = DBselect(
"select nextid"
" from ids"
" where table_name='%s'"
" and field_name='%s'",
table, fieldname);
if (NULL == (row = DBfetch(result)))
goto rollback;
ZBX_STR2UINT64(lastid, row[0]);
DBfree_result(result);
result = DBselect("select min(clock) from %s",
table);
if (NULL == (row = DBfetch(result)) || SUCCEED == DBis_null(row[0]))
goto rollback;
minclock = atoi(row[0]);
DBfree_result(result);
result = DBselect("select max(id) from %s",
table);
if (NULL == (row = DBfetch(result)) || SUCCEED == DBis_null(row[0]))
goto rollback;
ZBX_STR2UINT64(maxid, row[0]);
DBfree_result(result);
records = DBexecute(
"delete from %s"
" where id<" ZBX_FS_UI64
" and (clock<%d"
" or (id<=" ZBX_FS_UI64 " and clock<%d))",
table, maxid,
now - CONFIG_PROXY_OFFLINE_BUFFER * SEC_PER_HOUR,
lastid,
MIN(now - CONFIG_PROXY_LOCAL_BUFFER * SEC_PER_HOUR,
minclock + HK_MAX_DELETE_PERIODS * hk_period));
DBcommit();
return records;
rollback:
DBfree_result(result);
DBrollback();
return 0;
}
/******************************************************************************
* *
* Function: housekeeping_history *
* *
* Purpose: remove outdated information from history *
* *
* Parameters: now - current timestamp *
* *
* Return value: SUCCEED - information removed successfully *
* FAIL - otherwise *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static int housekeeping_history(int now)
{
int records = 0;
zabbix_log(LOG_LEVEL_DEBUG, "In housekeeping_history()");
records += delete_history("proxy_history", "history_lastid", now);
records += delete_history("proxy_dhistory", "dhistory_lastid", now);
records += delete_history("proxy_autoreg_host", "autoreg_host_lastid", now);
return records;
}
static int get_housekeeper_period(double time_slept)
{
if (SEC_PER_HOUR > time_slept)
return SEC_PER_HOUR;
else if (24 * SEC_PER_HOUR < time_slept)
return 24 * SEC_PER_HOUR;
else
return (int)time_slept;
}
ZBX_THREAD_ENTRY(housekeeper_thread, args)
{
int records, start, sleeptime;
double sec, time_slept, time_now;
char sleeptext[25];
process_type = ((zbx_thread_args_t *)args)->process_type;
server_num = ((zbx_thread_args_t *)args)->server_num;
process_num = ((zbx_thread_args_t *)args)->process_num;
zabbix_log(LOG_LEVEL_INFORMATION, "%s #%d started [%s #%d]", get_program_type_string(program_type),
server_num, get_process_type_string(process_type), process_num);
if (0 == CONFIG_HOUSEKEEPING_FREQUENCY)
{
zbx_setproctitle("%s [waiting for user command]", get_process_type_string(process_type));
zbx_snprintf(sleeptext, sizeof(sleeptext), "waiting for user command");
}
else
{
sleeptime = HOUSEKEEPER_STARTUP_DELAY * SEC_PER_MIN;
zbx_setproctitle("%s [startup idle for %d minutes]", get_process_type_string(process_type),
HOUSEKEEPER_STARTUP_DELAY);
zbx_snprintf(sleeptext, sizeof(sleeptext), "idle for %d hour(s)", CONFIG_HOUSEKEEPING_FREQUENCY);
}
zbx_set_sigusr_handler(zbx_housekeeper_sigusr_handler);
for (;;)
{
sec = zbx_time();
if (0 == CONFIG_HOUSEKEEPING_FREQUENCY)
zbx_sleep_forever();
else
zbx_sleep_loop(sleeptime);
time_now = zbx_time();
time_slept = time_now - sec;
zbx_update_env(time_now);
hk_period = get_housekeeper_period(time_slept);
start = time(NULL);
zabbix_log(LOG_LEVEL_WARNING, "executing housekeeper");
zbx_setproctitle("%s [connecting to the database]", get_process_type_string(process_type));
DBconnect(ZBX_DB_CONNECT_NORMAL);
zbx_setproctitle("%s [removing old history]", get_process_type_string(process_type));
sec = zbx_time();
records = housekeeping_history(start);
sec = zbx_time() - sec;
DBclose();
zbx_dc_cleanup_data_sessions();
zabbix_log(LOG_LEVEL_WARNING, "%s [deleted %d records in " ZBX_FS_DBL " sec, %s]",
get_process_type_string(process_type), records, sec, sleeptext);
zbx_setproctitle("%s [deleted %d records in " ZBX_FS_DBL " sec, %s]",
get_process_type_string(process_type), records, sec, sleeptext);
if (0 != CONFIG_HOUSEKEEPING_FREQUENCY)
sleeptime = CONFIG_HOUSEKEEPING_FREQUENCY * SEC_PER_HOUR;
}
}
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