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/*
** Zabbix
** Copyright (C) 2001-2020 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 "dbcache.h"
#include "zbxserver.h"
#include "template.h"
#include "events.h"
#define ZBX_FLAGS_TRIGGER_CREATE_NOTHING 0x00
#define ZBX_FLAGS_TRIGGER_CREATE_TRIGGER_EVENT 0x01
#define ZBX_FLAGS_TRIGGER_CREATE_INTERNAL_EVENT 0x02
#define ZBX_FLAGS_TRIGGER_CREATE_EVENT \
(ZBX_FLAGS_TRIGGER_CREATE_TRIGGER_EVENT | ZBX_FLAGS_TRIGGER_CREATE_INTERNAL_EVENT)
/******************************************************************************
* *
* Function: zbx_process_trigger *
* *
* Purpose: 1) calculate changeset of trigger fields to be updated *
* 2) generate events *
* *
* Parameters: trigger - [IN] the trigger to process *
* diffs - [OUT] the vector with trigger changes *
* *
* Return value: SUCCEED - trigger processed successfully *
* FAIL - no changes *
* *
* Comments: Trigger dependency checks will be done during event processing. *
* *
* Event generation depending on trigger value/state changes: *
* *
* From \ To | OK | OK(?) | PROBLEM | PROBLEM(?) | NONE *
*----------------------------------------------------------------------------*
* OK | . | I | E | I | . *
* | | | | | *
* OK(?) | I | . | E,I | - | I *
* | | | | | *
* PROBLEM | E | I | E(m) | I | . *
* | | | | | *
* PROBLEM(?) | E,I | - | E(m),I | . | I *
* *
* Legend: *
* 'E' - trigger event *
* 'I' - internal event *
* '.' - nothing *
* '-' - should never happen *
* *
******************************************************************************/
static int zbx_process_trigger(struct _DC_TRIGGER *trigger, zbx_vector_ptr_t *diffs)
{
const char *new_error;
int new_state, new_value, ret = FAIL;
zbx_uint64_t flags = ZBX_FLAGS_TRIGGER_DIFF_UNSET, event_flags = ZBX_FLAGS_TRIGGER_CREATE_NOTHING;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() triggerid:" ZBX_FS_UI64 " value:%d(%d) new_value:%d",
__func__, trigger->triggerid, trigger->value, trigger->state, trigger->new_value);
if (TRIGGER_VALUE_UNKNOWN == trigger->new_value)
{
new_state = TRIGGER_STATE_UNKNOWN;
new_value = trigger->value;
}
else
{
new_state = TRIGGER_STATE_NORMAL;
new_value = trigger->new_value;
}
new_error = (NULL == trigger->new_error ? "" : trigger->new_error);
if (trigger->state != new_state)
{
flags |= ZBX_FLAGS_TRIGGER_DIFF_UPDATE_STATE;
event_flags |= ZBX_FLAGS_TRIGGER_CREATE_INTERNAL_EVENT;
}
if (0 != strcmp(trigger->error, new_error))
flags |= ZBX_FLAGS_TRIGGER_DIFF_UPDATE_ERROR;
if (TRIGGER_STATE_NORMAL == new_state)
{
if (TRIGGER_VALUE_PROBLEM == new_value)
{
if (TRIGGER_VALUE_OK == trigger->value || TRIGGER_TYPE_MULTIPLE_TRUE == trigger->type)
event_flags |= ZBX_FLAGS_TRIGGER_CREATE_TRIGGER_EVENT;
}
else if (TRIGGER_VALUE_OK == new_value)
{
if (TRIGGER_VALUE_PROBLEM == trigger->value || 0 == trigger->lastchange)
event_flags |= ZBX_FLAGS_TRIGGER_CREATE_TRIGGER_EVENT;
}
}
/* check if there is something to be updated */
if (0 == (flags & ZBX_FLAGS_TRIGGER_DIFF_UPDATE) && 0 == (event_flags & ZBX_FLAGS_TRIGGER_CREATE_EVENT))
goto out;
if (0 != (event_flags & ZBX_FLAGS_TRIGGER_CREATE_TRIGGER_EVENT))
{
zbx_add_event(EVENT_SOURCE_TRIGGERS, EVENT_OBJECT_TRIGGER, trigger->triggerid,
&trigger->timespec, new_value, trigger->description,
trigger->expression_orig, trigger->recovery_expression_orig,
trigger->priority, trigger->type, &trigger->tags,
trigger->correlation_mode, trigger->correlation_tag, trigger->value, trigger->opdata,
NULL);
}
if (0 != (event_flags & ZBX_FLAGS_TRIGGER_CREATE_INTERNAL_EVENT))
{
zbx_add_event(EVENT_SOURCE_INTERNAL, EVENT_OBJECT_TRIGGER, trigger->triggerid,
&trigger->timespec, new_state, NULL, NULL, NULL, 0, 0, NULL, 0, NULL, 0, NULL,
new_error);
}
zbx_append_trigger_diff(diffs, trigger->triggerid, trigger->priority, flags, trigger->value, new_state,
trigger->timespec.sec, new_error);
ret = SUCCEED;
out:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s flags:" ZBX_FS_UI64, __func__, zbx_result_string(ret),
flags);
return ret;
}
/******************************************************************************
* *
* Function: zbx_db_save_trigger_changes *
* *
* Purpose: save the trigger changes to database *
* *
* Parameters:trigger_diff - [IN] the trigger changeset *
* *
******************************************************************************/
void zbx_db_save_trigger_changes(const zbx_vector_ptr_t *trigger_diff)
{
int i;
char *sql = NULL;
size_t sql_alloc = 0, sql_offset = 0;
const zbx_trigger_diff_t *diff;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
DBbegin_multiple_update(&sql, &sql_alloc, &sql_offset);
for (i = 0; i < trigger_diff->values_num; i++)
{
char delim = ' ';
diff = (const zbx_trigger_diff_t *)trigger_diff->values[i];
if (0 == (diff->flags & ZBX_FLAGS_TRIGGER_DIFF_UPDATE))
continue;
zbx_strcpy_alloc(&sql, &sql_alloc, &sql_offset, "update triggers set");
if (0 != (diff->flags & ZBX_FLAGS_TRIGGER_DIFF_UPDATE_LASTCHANGE))
{
zbx_snprintf_alloc(&sql, &sql_alloc, &sql_offset, "%clastchange=%d", delim, diff->lastchange);
delim = ',';
}
if (0 != (diff->flags & ZBX_FLAGS_TRIGGER_DIFF_UPDATE_VALUE))
{
zbx_snprintf_alloc(&sql, &sql_alloc, &sql_offset, "%cvalue=%d", delim, diff->value);
delim = ',';
}
if (0 != (diff->flags & ZBX_FLAGS_TRIGGER_DIFF_UPDATE_STATE))
{
zbx_snprintf_alloc(&sql, &sql_alloc, &sql_offset, "%cstate=%d", delim, diff->state);
delim = ',';
}
if (0 != (diff->flags & ZBX_FLAGS_TRIGGER_DIFF_UPDATE_ERROR))
{
char *error_esc;
error_esc = DBdyn_escape_field("triggers", "error", diff->error);
zbx_snprintf_alloc(&sql, &sql_alloc, &sql_offset, "%cerror='%s'", delim, error_esc);
zbx_free(error_esc);
}
zbx_snprintf_alloc(&sql, &sql_alloc, &sql_offset, " where triggerid=" ZBX_FS_UI64 ";\n",
diff->triggerid);
DBexecute_overflowed_sql(&sql, &sql_alloc, &sql_offset);
}
DBend_multiple_update(&sql, &sql_alloc, &sql_offset);
if (sql_offset > 16) /* in ORACLE always present begin..end; */
DBexecute("%s", sql);
zbx_free(sql);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
}
/******************************************************************************
* *
* Function: zbx_trigger_diff_free *
* *
* Purpose: frees trigger changeset *
* *
******************************************************************************/
void zbx_trigger_diff_free(zbx_trigger_diff_t *diff)
{
zbx_free(diff->error);
zbx_free(diff);
}
/******************************************************************************
* *
* Comments: helper function for zbx_process_triggers() *
* *
******************************************************************************/
static int zbx_trigger_topoindex_compare(const void *d1, const void *d2)
{
const DC_TRIGGER *t1 = *(const DC_TRIGGER **)d1;
const DC_TRIGGER *t2 = *(const DC_TRIGGER **)d2;
ZBX_RETURN_IF_NOT_EQUAL(t1->topoindex, t2->topoindex);
return 0;
}
/******************************************************************************
* *
* Function: zbx_process_triggers *
* *
* Purpose: process triggers - calculates property changeset and generates *
* events *
* *
* Parameters: triggers - [IN] the triggers to process *
* trigger_diff - [OUT] the trigger changeset *
* *
* Comments: The trigger_diff changeset must be cleaned by the caller: *
* zbx_vector_ptr_clear_ext(trigger_diff, *
* (zbx_clean_func_t)zbx_trigger_diff_free); *
* *
******************************************************************************/
void zbx_process_triggers(zbx_vector_ptr_t *triggers, zbx_vector_ptr_t *trigger_diff)
{
int i;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() values_num:%d", __func__, triggers->values_num);
if (0 == triggers->values_num)
goto out;
zbx_vector_ptr_sort(triggers, zbx_trigger_topoindex_compare);
for (i = 0; i < triggers->values_num; i++)
zbx_process_trigger((struct _DC_TRIGGER *)triggers->values[i], trigger_diff);
zbx_vector_ptr_sort(trigger_diff, ZBX_DEFAULT_UINT64_PTR_COMPARE_FUNC);
out:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
}
/******************************************************************************
* *
* Function: zbx_append_trigger_diff *
* *
* Purpose: Adds a new trigger diff to trigger changeset vector *
* *
******************************************************************************/
void zbx_append_trigger_diff(zbx_vector_ptr_t *trigger_diff, zbx_uint64_t triggerid, unsigned char priority,
zbx_uint64_t flags, unsigned char value, unsigned char state, int lastchange, const char *error)
{
zbx_trigger_diff_t *diff;
diff = (zbx_trigger_diff_t *)zbx_malloc(NULL, sizeof(zbx_trigger_diff_t));
diff->triggerid = triggerid;
diff->priority = priority;
diff->flags = flags;
diff->value = value;
diff->state = state;
diff->lastchange = lastchange;
diff->error = (NULL != error ? zbx_strdup(NULL, error) : NULL);
diff->problem_count = 0;
zbx_vector_ptr_append(trigger_diff, diff);
}
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