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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 "log.h"
#include "zbxalgo.h"
#include "zbxhistory.h"
#include "history.h"
#include "../zbxalgo/vectorimpl.h"
ZBX_VECTOR_IMPL(history_record, zbx_history_record_t)
extern char *CONFIG_HISTORY_STORAGE_URL;
extern char *CONFIG_HISTORY_STORAGE_OPTS;
zbx_history_iface_t history_ifaces[ITEM_VALUE_TYPE_MAX];
/************************************************************************************
* *
* Function: zbx_history_init *
* *
* Purpose: initializes history storage *
* *
* Comments: History interfaces are created for all values types based on *
* configuration. Every value type can have different history storage *
* backend. *
* *
************************************************************************************/
int zbx_history_init(char **error)
{
int i, ret;
/* TODO: support per value type specific configuration */
const char *opts[] = {"dbl", "str", "log", "uint", "text"};
for (i = 0; i < ITEM_VALUE_TYPE_MAX; i++)
{
if (NULL == CONFIG_HISTORY_STORAGE_URL || NULL == strstr(CONFIG_HISTORY_STORAGE_OPTS, opts[i]))
ret = zbx_history_sql_init(&history_ifaces[i], i, error);
else
ret = zbx_history_elastic_init(&history_ifaces[i], i, error);
if (FAIL == ret)
return FAIL;
}
return SUCCEED;
}
/************************************************************************************
* *
* Function: zbx_history_destroy *
* *
* Purpose: destroys history storage *
* *
* Comments: All interfaces created by zbx_history_init() function are destroyed *
* here. *
* *
************************************************************************************/
void zbx_history_destroy(void)
{
int i;
for (i = 0; i < ITEM_VALUE_TYPE_MAX; i++)
{
zbx_history_iface_t *writer = &history_ifaces[i];
writer->destroy(writer);
}
}
/************************************************************************************
* *
* Function: zbx_history_add_values *
* *
* Purpose: Sends values to the history storage *
* *
* Parameters: history - [IN] the values to store *
* *
* Comments: add history values to the configured storage backends *
* *
************************************************************************************/
int zbx_history_add_values(const zbx_vector_ptr_t *history)
{
int i, flags = 0, ret = SUCCEED;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
for (i = 0; i < ITEM_VALUE_TYPE_MAX; i++)
{
zbx_history_iface_t *writer = &history_ifaces[i];
if (0 < writer->add_values(writer, history))
flags |= (1 << i);
}
for (i = 0; i < ITEM_VALUE_TYPE_MAX; i++)
{
zbx_history_iface_t *writer = &history_ifaces[i];
if (0 != (flags & (1 << i)))
ret = writer->flush(writer);
}
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
return ret;
}
/************************************************************************************
* *
* Function: zbx_history_get_values *
* *
* Purpose: gets item values from history storage *
* *
* Parameters: itemid - [IN] the itemid *
* value_type - [IN] the item value type *
* start - [IN] the period start timestamp *
* count - [IN] the number of values to read *
* end - [IN] the period end timestamp *
* values - [OUT] the item history data values *
* *
* Return value: SUCCEED - the history data were read successfully *
* FAIL - otherwise *
* *
* Comments: This function reads <count> values from ]<start>,<end>] interval or *
* all values from the specified interval if count is zero. *
* *
************************************************************************************/
int zbx_history_get_values(zbx_uint64_t itemid, int value_type, int start, int count, int end,
zbx_vector_history_record_t *values)
{
int ret, pos;
zbx_history_iface_t *writer = &history_ifaces[value_type];
zabbix_log(LOG_LEVEL_DEBUG, "In %s() itemid:" ZBX_FS_UI64 " value_type:%d start:%d count:%d end:%d",
__func__, itemid, value_type, start, count, end);
pos = values->values_num;
ret = writer->get_values(writer, itemid, start, count, end, values);
if (SUCCEED == ret && SUCCEED == ZBX_CHECK_LOG_LEVEL(LOG_LEVEL_TRACE))
{
int i;
char buffer[MAX_STRING_LEN];
for (i = pos; i < values->values_num; i++)
{
zbx_history_record_t *h = &values->values[i];
zbx_history_value2str(buffer, sizeof(buffer), &h->value, value_type);
zabbix_log(LOG_LEVEL_TRACE, " %d.%09d %s", h->timestamp.sec, h->timestamp.ns, buffer);
}
}
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s values:%d", __func__, zbx_result_string(ret),
values->values_num - pos);
return ret;
}
/************************************************************************************
* *
* Function: zbx_history_requires_trends *
* *
* Purpose: checks if the value type requires trends data calculations *
* *
* Parameters: value_type - [IN] the value type *
* *
* Return value: SUCCEED - trends must be calculated for this value type *
* FAIL - otherwise *
* *
* Comments: This function is used to check if the trends must be calculated for *
* the specified value type based on the history storage used. *
* *
************************************************************************************/
int zbx_history_requires_trends(int value_type)
{
zbx_history_iface_t *writer = &history_ifaces[value_type];
return 0 != writer->requires_trends ? SUCCEED : FAIL;
}
/******************************************************************************
* *
* Function: history_logfree *
* *
* Purpose: frees history log and all resources allocated for it *
* *
* Parameters: log - [IN] the history log to free *
* *
******************************************************************************/
static void history_logfree(zbx_log_value_t *log)
{
zbx_free(log->source);
zbx_free(log->value);
zbx_free(log);
}
/******************************************************************************
* *
* Function: zbx_history_record_vector_destroy *
* *
* Purpose: destroys value vector and frees resources allocated for it *
* *
* Parameters: vector - [IN] the value vector *
* *
* Comments: Use this function to destroy value vectors created by *
* zbx_vc_get_values_by_* functions. *
* *
******************************************************************************/
void zbx_history_record_vector_destroy(zbx_vector_history_record_t *vector, int value_type)
{
if (NULL != vector->values)
{
zbx_history_record_vector_clean(vector, value_type);
zbx_vector_history_record_destroy(vector);
}
}
/******************************************************************************
* *
* Function: zbx_history_record_clear *
* *
* Purpose: frees resources allocated by a cached value *
* *
* Parameters: value - [IN] the cached value to clear *
* value_type - [IN] the history value type *
* *
******************************************************************************/
void zbx_history_record_clear(zbx_history_record_t *value, int value_type)
{
switch (value_type)
{
case ITEM_VALUE_TYPE_STR:
case ITEM_VALUE_TYPE_TEXT:
zbx_free(value->value.str);
break;
case ITEM_VALUE_TYPE_LOG:
history_logfree(value->value.log);
}
}
/******************************************************************************
* *
* Function: zbx_history_value2str *
* *
* Purpose: converts history value to string format *
* *
* Parameters: buffer - [OUT] the output buffer *
* size - [IN] the output buffer size *
* value - [IN] the value to convert *
* value_type - [IN] the history value type *
* *
******************************************************************************/
void zbx_history_value2str(char *buffer, size_t size, const history_value_t *value, int value_type)
{
switch (value_type)
{
case ITEM_VALUE_TYPE_FLOAT:
zbx_snprintf(buffer, size, ZBX_FS_DBL, value->dbl);
break;
case ITEM_VALUE_TYPE_UINT64:
zbx_snprintf(buffer, size, ZBX_FS_UI64, value->ui64);
break;
case ITEM_VALUE_TYPE_STR:
case ITEM_VALUE_TYPE_TEXT:
zbx_strlcpy_utf8(buffer, value->str, size);
break;
case ITEM_VALUE_TYPE_LOG:
zbx_strlcpy_utf8(buffer, value->log->value, size);
}
}
/******************************************************************************
* *
* Function: zbx_history_record_vector_clean *
* *
* Purpose: releases resources allocated to store history records *
* *
* Parameters: vector - [IN] the history record vector *
* value_type - [IN] the type of vector values *
* *
******************************************************************************/
void zbx_history_record_vector_clean(zbx_vector_history_record_t *vector, int value_type)
{
int i;
switch (value_type)
{
case ITEM_VALUE_TYPE_STR:
case ITEM_VALUE_TYPE_TEXT:
for (i = 0; i < vector->values_num; i++)
zbx_free(vector->values[i].value.str);
break;
case ITEM_VALUE_TYPE_LOG:
for (i = 0; i < vector->values_num; i++)
history_logfree(vector->values[i].value.log);
}
zbx_vector_history_record_clear(vector);
}
/******************************************************************************
* *
* Function: zbx_history_record_compare_asc_func *
* *
* Purpose: compares two cache values by their timestamps *
* *
* Parameters: d1 - [IN] the first value *
* d2 - [IN] the second value *
* *
* Return value: <0 - the first value timestamp is less than second *
* =0 - the first value timestamp is equal to the second *
* >0 - the first value timestamp is greater than second *
* *
* Comments: This function is commonly used to sort value vector in ascending *
* order. *
* *
******************************************************************************/
int zbx_history_record_compare_asc_func(const zbx_history_record_t *d1, const zbx_history_record_t *d2)
{
if (d1->timestamp.sec == d2->timestamp.sec)
return d1->timestamp.ns - d2->timestamp.ns;
return d1->timestamp.sec - d2->timestamp.sec;
}
/******************************************************************************
* *
* Function: vc_history_record_compare_desc_func *
* *
* Purpose: compares two cache values by their timestamps *
* *
* Parameters: d1 - [IN] the first value *
* d2 - [IN] the second value *
* *
* Return value: >0 - the first value timestamp is less than second *
* =0 - the first value timestamp is equal to the second *
* <0 - the first value timestamp is greater than second *
* *
* Comments: This function is commonly used to sort value vector in descending*
* order. *
* *
******************************************************************************/
int zbx_history_record_compare_desc_func(const zbx_history_record_t *d1, const zbx_history_record_t *d2)
{
if (d1->timestamp.sec == d2->timestamp.sec)
return d2->timestamp.ns - d1->timestamp.ns;
return d2->timestamp.sec - d1->timestamp.sec;
}
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