/*
** 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 "zbxhistory.h"
#include "history.h"
#include "log.h"
#include "zbxalgo.h"
#include "zbxdb.h"
#include "zbxstr.h"
#include "zbxnum.h"
#include "zbxvariant.h"
#include "zbx_dbversion_constants.h"
/* curl_multi_wait() is supported starting with version 7.28.0 (0x071c00) */
#if defined(HAVE_LIBCURL) && LIBCURL_VERSION_NUM >= 0x071c00
#define ZBX_HISTORY_STORAGE_DOWN 10000 /* Timeout in milliseconds */
#define ZBX_IDX_JSON_ALLOCATE 256
#define ZBX_JSON_ALLOCATE 2048
const char *value_type_str[] = {"dbl", "str", "log", "uint", "text"};
extern char *CONFIG_HISTORY_STORAGE_URL;
extern int CONFIG_HISTORY_STORAGE_PIPELINES;
extern int CONFIG_ALLOW_UNSUPPORTED_DB_VERSIONS;
static zbx_uint32_t ZBX_ELASTIC_SVERSION = ZBX_DBVERSION_UNDEFINED;
typedef struct
{
char *base_url;
char *post_url;
char *buf;
CURL *handle;
}
zbx_elastic_data_t;
typedef struct
{
unsigned char initialized;
zbx_vector_ptr_t ifaces;
CURLM *handle;
}
zbx_elastic_writer_t;
static zbx_elastic_writer_t writer;
typedef struct
{
char *data;
size_t alloc;
size_t offset;
}
zbx_httppage_t;
static zbx_httppage_t page_r;
typedef struct
{
zbx_httppage_t page;
char errbuf[CURL_ERROR_SIZE];
}
zbx_curlpage_t;
static zbx_curlpage_t page_w[ITEM_VALUE_TYPE_MAX];
static size_t curl_write_cb(void *ptr, size_t size, size_t nmemb, void *userdata)
{
size_t r_size = size * nmemb;
zbx_httppage_t *page = (zbx_httppage_t *)userdata;
zbx_strncpy_alloc(&page->data, &page->alloc, &page->offset, ptr, r_size);
return r_size;
}
static zbx_history_value_t history_str2value(char *str, unsigned char value_type)
{
zbx_history_value_t value;
switch (value_type)
{
case ITEM_VALUE_TYPE_LOG:
value.log = (zbx_log_value_t *)zbx_malloc(NULL, sizeof(zbx_log_value_t));
memset(value.log, 0, sizeof(zbx_log_value_t));
value.log->value = zbx_strdup(NULL, str);
break;
case ITEM_VALUE_TYPE_STR:
case ITEM_VALUE_TYPE_TEXT:
value.str = zbx_strdup(NULL, str);
break;
case ITEM_VALUE_TYPE_FLOAT:
value.dbl = atof(str);
break;
case ITEM_VALUE_TYPE_UINT64:
ZBX_STR2UINT64(value.ui64, str);
break;
}
return value;
}
static const char *history_value2str(const ZBX_DC_HISTORY *h)
{
static char buffer[ZBX_MAX_DOUBLE_LEN + 1];
switch (h->value_type)
{
case ITEM_VALUE_TYPE_STR:
case ITEM_VALUE_TYPE_TEXT:
return h->value.str;
case ITEM_VALUE_TYPE_LOG:
return h->value.log->value;
case ITEM_VALUE_TYPE_FLOAT:
zbx_snprintf(buffer, sizeof(buffer), ZBX_FS_DBL64, h->value.dbl);
break;
case ITEM_VALUE_TYPE_UINT64:
zbx_snprintf(buffer, sizeof(buffer), ZBX_FS_UI64, h->value.ui64);
break;
}
return buffer;
}
static int history_parse_value(struct zbx_json_parse *jp, unsigned char value_type, zbx_history_record_t *hr)
{
char *value = NULL;
size_t value_alloc = 0;
int ret = FAIL;
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "clock", &value, &value_alloc, NULL))
goto out;
hr->timestamp.sec = atoi(value);
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "ns", &value, &value_alloc, NULL))
goto out;
hr->timestamp.ns = atoi(value);
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "value", &value, &value_alloc, NULL))
goto out;
hr->value = history_str2value(value, value_type);
if (ITEM_VALUE_TYPE_LOG == value_type)
{
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "timestamp", &value, &value_alloc, NULL))
goto out;
hr->value.log->timestamp = atoi(value);
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "logeventid", &value, &value_alloc, NULL))
goto out;
hr->value.log->logeventid = atoi(value);
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "severity", &value, &value_alloc, NULL))
goto out;
hr->value.log->severity = atoi(value);
if (SUCCEED != zbx_json_value_by_name_dyn(jp, "source", &value, &value_alloc, NULL))
goto out;
hr->value.log->source = zbx_strdup(NULL, value);
}
ret = SUCCEED;
out:
zbx_free(value);
return ret;
}
static void elastic_log_error(CURL *handle, CURLcode error, const char *errbuf)
{
char http_status[MAX_STRING_LEN];
long int http_code;
if (CURLE_HTTP_RETURNED_ERROR == error)
{
if (CURLE_OK == curl_easy_getinfo(handle, CURLINFO_RESPONSE_CODE, &http_code))
zbx_snprintf(http_status, sizeof(http_status), "HTTP status code: %ld", http_code);
else
zbx_strlcpy(http_status, "unknown HTTP status code", sizeof(http_status));
if (0 != page_r.offset)
{
zabbix_log(LOG_LEVEL_ERR, "cannot get values from elasticsearch, %s, message: %s", http_status,
page_r.data);
}
else
zabbix_log(LOG_LEVEL_ERR, "cannot get values from elasticsearch, %s", http_status);
}
else
{
zabbix_log(LOG_LEVEL_ERR, "cannot get values from elasticsearch: %s",
'\0' != *errbuf ? errbuf : curl_easy_strerror(error));
}
}
/************************************************************************************
* *
* Purpose: closes connection and releases allocated resources *
* *
* Parameters: hist - [IN] the history storage interface *
* *
************************************************************************************/
static void elastic_close(zbx_history_iface_t *hist)
{
zbx_elastic_data_t *data = hist->data.elastic_data;
zbx_free(data->buf);
zbx_free(data->post_url);
if (NULL != data->handle)
{
if (NULL != writer.handle)
curl_multi_remove_handle(writer.handle, data->handle);
curl_easy_cleanup(data->handle);
data->handle = NULL;
}
}
/******************************************************************************
* *
* Purpose: check an error from Elastic json response *
* *
* Parameters: page - [IN] the buffer with json response *
* err - [OUT] the parse error message. If the error value is *
* set it must be freed by caller after it has *
* been used. *
* *
* Return value: SUCCEED - the response contains an error *
* FAIL - otherwise *
* *
******************************************************************************/
static int elastic_is_error_present(zbx_httppage_t *page, char **err)
{
struct zbx_json_parse jp, jp_values, jp_index, jp_error, jp_items, jp_item;
const char *errors, *p = NULL;
char *index = NULL, *status = NULL, *type = NULL, *reason = NULL;
size_t index_alloc = 0, status_alloc = 0, type_alloc = 0, reason_alloc = 0;
int rc_js = SUCCEED;
zabbix_log(LOG_LEVEL_TRACE, "%s() raw json: %s", __func__, ZBX_NULL2EMPTY_STR(page->data));
if (SUCCEED != zbx_json_open(page->data, &jp) || SUCCEED != zbx_json_brackets_open(jp.start, &jp_values))
return FAIL;
if (NULL == (errors = zbx_json_pair_by_name(&jp_values, "errors")) || 0 != strncmp("true", errors, 4))
return FAIL;
if (SUCCEED == zbx_json_brackets_by_name(&jp, "items", &jp_items))
{
while (NULL != (p = zbx_json_next(&jp_items, p)))
{
if (SUCCEED == zbx_json_brackets_open(p, &jp_item) &&
SUCCEED == zbx_json_brackets_by_name(&jp_item, "index", &jp_index) &&
SUCCEED == zbx_json_brackets_by_name(&jp_index, "error", &jp_error))
{
if (SUCCEED != zbx_json_value_by_name_dyn(&jp_error, "type", &type, &type_alloc, NULL))
rc_js = FAIL;
if (SUCCEED != zbx_json_value_by_name_dyn(&jp_error, "reason", &reason, &reason_alloc, NULL))
rc_js = FAIL;
}
else
continue;
if (SUCCEED != zbx_json_value_by_name_dyn(&jp_index, "status", &status, &status_alloc, NULL))
rc_js = FAIL;
if (SUCCEED != zbx_json_value_by_name_dyn(&jp_index, "_index", &index, &index_alloc, NULL))
rc_js = FAIL;
break;
}
}
else
rc_js = FAIL;
*err = zbx_dsprintf(NULL,"index:%s status:%s type:%s reason:%s%s", ZBX_NULL2EMPTY_STR(index),
ZBX_NULL2EMPTY_STR(status), ZBX_NULL2EMPTY_STR(type), ZBX_NULL2EMPTY_STR(reason),
FAIL == rc_js ? " / elasticsearch version is not fully compatible with zabbix server" : "");
zbx_free(status);
zbx_free(type);
zbx_free(reason);
zbx_free(index);
return SUCCEED;
}
/******************************************************************************************************************
* *
* common sql service support *
* *
******************************************************************************************************************/
/************************************************************************************
* *
* Purpose: initializes elastic writer for a new batch of history values *
* *
************************************************************************************/
static void elastic_writer_init(void)
{
if (0 != writer.initialized)
return;
zbx_vector_ptr_create(&writer.ifaces);
if (NULL == (writer.handle = curl_multi_init()))
{
zbx_error("Cannot initialize cURL multi session");
exit(EXIT_FAILURE);
}
writer.initialized = 1;
}
/************************************************************************************
* *
* Purpose: releases initialized elastic writer by freeing allocated resources and *
* setting its state to uninitialized. *
* *
************************************************************************************/
static void elastic_writer_release(void)
{
int i;
for (i = 0; i < writer.ifaces.values_num; i++)
elastic_close((zbx_history_iface_t *)writer.ifaces.values[i]);
curl_multi_cleanup(writer.handle);
writer.handle = NULL;
zbx_vector_ptr_destroy(&writer.ifaces);
writer.initialized = 0;
}
/************************************************************************************
* *
* Purpose: adds history storage interface to be flushed later *
* *
* Parameters: db_insert - [IN] bulk insert data *
* *
************************************************************************************/
static void elastic_writer_add_iface(zbx_history_iface_t *hist)
{
zbx_elastic_data_t *data = hist->data.elastic_data;
CURLoption opt;
CURLcode err;
elastic_writer_init();
if (NULL == (data->handle = curl_easy_init()))
{
zabbix_log(LOG_LEVEL_ERR, "cannot initialize cURL session");
return;
}
if (CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_URL, data->post_url)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_POST, 1L)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_POSTFIELDS, data->buf)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_WRITEFUNCTION,
curl_write_cb)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_WRITEDATA,
&page_w[hist->value_type].page)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_FAILONERROR, 1L)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_ERRORBUFFER,
page_w[hist->value_type].errbuf)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = ZBX_CURLOPT_ACCEPT_ENCODING, "")))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto out;
}
#if LIBCURL_VERSION_NUM >= 0x071304
/* CURLOPT_PROTOCOLS is supported starting with version 7.19.4 (0x071304) */
if (CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_PROTOCOLS,
CURLPROTO_HTTP | CURLPROTO_HTTPS)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto out;
}
#endif
*page_w[hist->value_type].errbuf = '\0';
if (CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_PRIVATE, &page_w[hist->value_type])))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto out;
}
page_w[hist->value_type].page.offset = 0;
if (0 < page_w[hist->value_type].page.alloc)
*page_w[hist->value_type].page.data = '\0';
curl_multi_add_handle(writer.handle, data->handle);
zbx_vector_ptr_append(&writer.ifaces, hist);
return;
out:
elastic_close(hist);
}
/************************************************************************************
* *
* Purpose: posts historical data to elastic storage *
* *
************************************************************************************/
static int elastic_writer_flush(void)
{
struct curl_slist *curl_headers = NULL;
int i, running, previous, msgnum;
CURLMsg *msg;
zbx_vector_ptr_t retries;
CURLcode err;
int ret = SUCCEED;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
/* The writer might be uninitialized only if the history */
/* was already flushed. In that case, return SUCCEED */
if (0 == writer.initialized)
goto end;
zbx_vector_ptr_create(&retries);
curl_headers = curl_slist_append(curl_headers, "Content-Type: application/x-ndjson");
for (i = 0; i < writer.ifaces.values_num; i++)
{
zbx_history_iface_t *hist = (zbx_history_iface_t *)writer.ifaces.values[i];
zbx_elastic_data_t *data = hist->data.elastic_data;
if (CURLE_OK != (err = curl_easy_setopt(data->handle, CURLOPT_HTTPHEADER, curl_headers)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)CURLOPT_HTTPHEADER,
curl_easy_strerror(err));
ret = FAIL;
goto clean;
}
zabbix_log(LOG_LEVEL_DEBUG, "sending %s", data->buf);
}
try_again:
previous = 0;
do
{
int fds;
CURLMcode code;
char *error;
zbx_curlpage_t *curl_page;
if (CURLM_OK != (code = curl_multi_perform(writer.handle, &running)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot perform on curl multi handle: %s", curl_multi_strerror(code));
break;
}
if (CURLM_OK != (code = curl_multi_wait(writer.handle, NULL, 0, ZBX_HISTORY_STORAGE_DOWN, &fds)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot wait on curl multi handle: %s", curl_multi_strerror(code));
break;
}
if (previous == running)
continue;
while (NULL != (msg = curl_multi_info_read(writer.handle, &msgnum)))
{
/* If the error is due to malformed data, there is no sense on re-trying to send. */
/* That's why we actually check for transport and curl errors separately */
if (CURLE_HTTP_RETURNED_ERROR == msg->data.result)
{
if (CURLE_OK == curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
(char **)&curl_page) && '\0' != *curl_page->errbuf)
{
zabbix_log(LOG_LEVEL_ERR, "cannot send data to elasticsearch, HTTP error"
" message: %s", curl_page->errbuf);
}
else
{
char http_status[MAX_STRING_LEN];
long int response_code;
if (CURLE_OK == curl_easy_getinfo(msg->easy_handle,
CURLINFO_RESPONSE_CODE, &response_code))
{
zbx_snprintf(http_status, sizeof(http_status), "HTTP status code: %ld",
response_code);
}
else
{
zbx_strlcpy(http_status, "unknown HTTP status code",
sizeof(http_status));
}
zabbix_log(LOG_LEVEL_ERR, "cannot send data to elasticsearch, %s", http_status);
}
}
else if (CURLE_OK != msg->data.result)
{
if (CURLE_OK == curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
(char **)&curl_page) && '\0' != *curl_page->errbuf)
{
zabbix_log(LOG_LEVEL_WARNING, "cannot send data to elasticsearch: %s",
curl_page->errbuf);
}
else
{
zabbix_log(LOG_LEVEL_WARNING, "cannot send data to elasticsearch: %s",
curl_easy_strerror(msg->data.result));
}
/* If the error is due to curl internal problems or unrelated */
/* problems with HTTP, we put the handle in a retry list and */
/* remove it from the current execution loop */
zbx_vector_ptr_append(&retries, msg->easy_handle);
curl_multi_remove_handle(writer.handle, msg->easy_handle);
}
else if (CURLE_OK == curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, (char **)&curl_page)
&& SUCCEED == elastic_is_error_present(&curl_page->page, &error))
{
zabbix_log(LOG_LEVEL_WARNING, "%s() cannot send data to elasticsearch: %s",
__func__, error);
zbx_free(error);
/* If the error is due to elastic internal problems (for example an index */
/* became read-only), we put the handle in a retry list and */
/* remove it from the current execution loop */
zbx_vector_ptr_append(&retries, msg->easy_handle);
curl_multi_remove_handle(writer.handle, msg->easy_handle);
}
}
previous = running;
}
while (running);
/* We check if we have handles to retry. If yes, we put them back in the multi */
/* handle and go to the beginning of the do while() for try sending the data again */
/* after sleeping for ZBX_HISTORY_STORAGE_DOWN / 1000 (seconds) */
if (0 < retries.values_num)
{
for (i = 0; i < retries.values_num; i++)
curl_multi_add_handle(writer.handle, retries.values[i]);
zbx_vector_ptr_clear(&retries);
sleep(ZBX_HISTORY_STORAGE_DOWN / 1000);
goto try_again;
}
clean:
curl_slist_free_all(curl_headers);
zbx_vector_ptr_destroy(&retries);
elastic_writer_release();
end:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
return ret;
}
/******************************************************************************************************************
* *
* history interface support *
* *
******************************************************************************************************************/
/************************************************************************************
* *
* Purpose: destroys history storage interface *
* *
* Parameters: hist - [IN] the history storage interface *
* *
************************************************************************************/
static void elastic_destroy(zbx_history_iface_t *hist)
{
zbx_elastic_data_t *data = hist->data.elastic_data;
elastic_close(hist);
zbx_free(data->base_url);
zbx_free(data);
}
/************************************************************************************
* *
* Purpose: gets item history data from history storage *
* *
* Parameters: hist - [IN] the history storage interface *
* itemid - [IN] the itemid *
* 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. *
* *
************************************************************************************/
static int elastic_get_values(zbx_history_iface_t *hist, zbx_uint64_t itemid, int start, int count, int end,
zbx_vector_history_record_t *values)
{
zbx_elastic_data_t *data = hist->data.elastic_data;
size_t url_alloc = 0, url_offset = 0, id_alloc = 0, scroll_alloc = 0, scroll_offset = 0;
int total, empty, ret;
CURLcode err;
struct zbx_json query;
struct curl_slist *curl_headers = NULL;
char *scroll_id = NULL, *scroll_query = NULL, errbuf[CURL_ERROR_SIZE];
CURLoption opt;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
ret = FAIL;
if (NULL == (data->handle = curl_easy_init()))
{
zabbix_log(LOG_LEVEL_ERR, "cannot initialize cURL session");
return FAIL;
}
zbx_snprintf_alloc(&data->post_url, &url_alloc, &url_offset, "%s/%s*/_search?scroll=10s", data->base_url,
value_type_str[hist->value_type]);
/* prepare the json query for elasticsearch, apply ranges if needed */
zbx_json_init(&query, ZBX_JSON_ALLOCATE);
if (0 < count)
{
zbx_json_adduint64(&query, "size", count);
zbx_json_addarray(&query, "sort");
zbx_json_addobject(&query, NULL);
zbx_json_addobject(&query, "clock");
zbx_json_addstring(&query, "order", "desc", ZBX_JSON_TYPE_STRING);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
}
zbx_json_addobject(&query, "query");
zbx_json_addobject(&query, "bool");
zbx_json_addarray(&query, "must");
zbx_json_addobject(&query, NULL);
zbx_json_addobject(&query, "match");
zbx_json_adduint64(&query, "itemid", itemid);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_addarray(&query, "filter");
zbx_json_addobject(&query, NULL);
zbx_json_addobject(&query, "range");
zbx_json_addobject(&query, "clock");
if (0 < start)
zbx_json_adduint64(&query, "gt", start);
if (0 < end)
zbx_json_adduint64(&query, "lte", end);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
zbx_json_close(&query);
curl_headers = curl_slist_append(curl_headers, "Content-Type: application/json");
if (CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_URL, data->post_url)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_POSTFIELDS, query.buffer)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_WRITEFUNCTION,
curl_write_cb)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_WRITEDATA, &page_r)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_HTTPHEADER, curl_headers)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_FAILONERROR, 1L)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_ERRORBUFFER, errbuf)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = ZBX_CURLOPT_ACCEPT_ENCODING, "")))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto out;
}
#if LIBCURL_VERSION_NUM >= 0x071304
/* CURLOPT_PROTOCOLS is supported starting with version 7.19.4 (0x071304) */
if (CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_PROTOCOLS,
CURLPROTO_HTTP | CURLPROTO_HTTPS)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto out;
}
#endif
zabbix_log(LOG_LEVEL_DEBUG, "sending query to %s; post data: %s", data->post_url, query.buffer);
page_r.offset = 0;
*errbuf = '\0';
if (CURLE_OK != (err = curl_easy_perform(data->handle)))
{
elastic_log_error(data->handle, err, errbuf);
goto out;
}
url_offset = 0;
zbx_snprintf_alloc(&data->post_url, &url_alloc, &url_offset, "%s/_search/scroll", data->base_url);
if (CURLE_OK != (err = curl_easy_setopt(data->handle, CURLOPT_URL, data->post_url)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)CURLOPT_URL,
curl_easy_strerror(err));
goto out;
}
total = (0 == count ? -1 : count);
/* For processing the records, we need to keep track of the total requested and if the response from the */
/* elasticsearch server is empty. For this we use two variables, empty and total. If the result is empty or */
/* the total reach zero, we terminate the scrolling query and return what we currently have. */
do
{
struct zbx_json_parse jp, jp_values, jp_item, jp_sub, jp_hits, jp_source;
zbx_history_record_t hr;
const char *p = NULL;
empty = 1;
zabbix_log(LOG_LEVEL_DEBUG, "received from elasticsearch: %s", page_r.data);
zbx_json_open(page_r.data, &jp);
zbx_json_brackets_open(jp.start, &jp_values);
/* get the scroll id immediately, for being used in subsequent queries */
if (SUCCEED != zbx_json_value_by_name_dyn(&jp_values, "_scroll_id", &scroll_id, &id_alloc, NULL))
{
zabbix_log(LOG_LEVEL_WARNING, "elasticsearch version is not compatible with zabbix server. "
"_scroll_id tag is absent");
}
zbx_json_brackets_by_name(&jp_values, "hits", &jp_sub);
zbx_json_brackets_by_name(&jp_sub, "hits", &jp_hits);
while (NULL != (p = zbx_json_next(&jp_hits, p)))
{
empty = 0;
if (SUCCEED != zbx_json_brackets_open(p, &jp_item))
continue;
if (SUCCEED != zbx_json_brackets_by_name(&jp_item, "_source", &jp_source))
continue;
if (SUCCEED != history_parse_value(&jp_source, hist->value_type, &hr))
continue;
zbx_vector_history_record_append_ptr(values, &hr);
if (-1 != total)
--total;
if (0 == total)
{
empty = 1;
break;
}
}
if (1 == empty)
{
ret = SUCCEED;
break;
}
/* scroll to the next page */
scroll_offset = 0;
zbx_snprintf_alloc(&scroll_query, &scroll_alloc, &scroll_offset,
"{\"scroll\":\"10s\",\"scroll_id\":\"%s\"}\n", ZBX_NULL2EMPTY_STR(scroll_id));
if (CURLE_OK != (err = curl_easy_setopt(data->handle, CURLOPT_POSTFIELDS, scroll_query)))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)CURLOPT_POSTFIELDS,
curl_easy_strerror(err));
break;
}
page_r.offset = 0;
*errbuf = '\0';
if (CURLE_OK != (err = curl_easy_perform(data->handle)))
{
elastic_log_error(data->handle, err, errbuf);
break;
}
}
while (0 == empty);
/* as recommended by the elasticsearch documentation, we close the scroll search through a DELETE request */
if (NULL != scroll_id)
{
url_offset = 0;
zbx_snprintf_alloc(&data->post_url, &url_alloc, &url_offset, "%s/_search/scroll/%s", data->base_url,
scroll_id);
if (CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_URL, data->post_url)) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_POSTFIELDS, "")) ||
CURLE_OK != (err = curl_easy_setopt(data->handle, opt = CURLOPT_CUSTOMREQUEST, "DELETE")))
{
zabbix_log(LOG_LEVEL_ERR, "cannot set cURL option %d: [%s]", (int)opt,
curl_easy_strerror(err));
ret = FAIL;
goto out;
}
zabbix_log(LOG_LEVEL_DEBUG, "elasticsearch closing scroll %s", data->post_url);
page_r.offset = 0;
*errbuf = '\0';
if (CURLE_OK != (err = curl_easy_perform(data->handle)))
elastic_log_error(data->handle, err, errbuf);
}
out:
elastic_close(hist);
curl_slist_free_all(curl_headers);
zbx_json_free(&query);
zbx_free(scroll_id);
zbx_free(scroll_query);
zbx_vector_history_record_sort(values, (zbx_compare_func_t)zbx_history_record_compare_desc_func);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
return ret;
}
/************************************************************************************
* *
* Purpose: sends history data to the storage *
* *
* Parameters: hist - [IN] the history storage interface *
* history - [IN] the history data vector (may have mixed value types) *
* *
************************************************************************************/
static int elastic_add_values(zbx_history_iface_t *hist, const zbx_vector_ptr_t *history)
{
zbx_elastic_data_t *data = hist->data.elastic_data;
int i, num = 0;
ZBX_DC_HISTORY *h;
struct zbx_json json_idx, json;
size_t buf_alloc = 0, buf_offset = 0;
char pipeline[14]; /* index name length + suffix "-pipeline" */
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
zbx_json_init(&json_idx, ZBX_IDX_JSON_ALLOCATE);
zbx_json_addobject(&json_idx, "index");
zbx_json_addstring(&json_idx, "_index", value_type_str[hist->value_type], ZBX_JSON_TYPE_STRING);
if (1 == CONFIG_HISTORY_STORAGE_PIPELINES)
{
zbx_snprintf(pipeline, sizeof(pipeline), "%s-pipeline", value_type_str[hist->value_type]);
zbx_json_addstring(&json_idx, "pipeline", pipeline, ZBX_JSON_TYPE_STRING);
}
zbx_json_close(&json_idx);
zbx_json_close(&json_idx);
for (i = 0; i < history->values_num; i++)
{
h = (ZBX_DC_HISTORY *)history->values[i];
if (hist->value_type != h->value_type)
continue;
zbx_json_init(&json, ZBX_JSON_ALLOCATE);
zbx_json_adduint64(&json, "itemid", h->itemid);
zbx_json_addstring(&json, "value", history_value2str(h), ZBX_JSON_TYPE_STRING);
if (ITEM_VALUE_TYPE_LOG == h->value_type)
{
const zbx_log_value_t *log;
log = h->value.log;
zbx_json_adduint64(&json, "timestamp", log->timestamp);
zbx_json_addstring(&json, "source", ZBX_NULL2EMPTY_STR(log->source), ZBX_JSON_TYPE_STRING);
zbx_json_adduint64(&json, "severity", log->severity);
zbx_json_adduint64(&json, "logeventid", log->logeventid);
}
zbx_json_adduint64(&json, "clock", h->ts.sec);
zbx_json_adduint64(&json, "ns", h->ts.ns);
zbx_json_adduint64(&json, "ttl", h->ttl);
zbx_json_close(&json);
zbx_snprintf_alloc(&data->buf, &buf_alloc, &buf_offset, "%s\n%s\n", json_idx.buffer, json.buffer);
zbx_json_free(&json);
num++;
}
if (num > 0)
{
data->post_url = zbx_dsprintf(NULL, "%s/_bulk?refresh=true", data->base_url);
elastic_writer_add_iface(hist);
}
zbx_json_free(&json_idx);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
return num;
}
/************************************************************************************
* *
* Purpose: flushes the history data to storage *
* *
* Parameters: hist - [IN] the history storage interface *
* *
* Comments: This function will try to flush the data until it succeeds or *
* unrecoverable error occurs *
* *
************************************************************************************/
static int elastic_flush(zbx_history_iface_t *hist)
{
ZBX_UNUSED(hist);
return elastic_writer_flush();
}
/************************************************************************************
* *
* Purpose: initializes history storage interface *
* *
* Parameters: hist - [IN] the history storage interface *
* value_type - [IN] the target value type *
* error - [OUT] the error message *
* *
* Return value: SUCCEED - the history storage interface was initialized *
* FAIL - otherwise *
* *
************************************************************************************/
int zbx_history_elastic_init(zbx_history_iface_t *hist, unsigned char value_type, char **error)
{
zbx_elastic_data_t *data;
if (0 != curl_global_init(CURL_GLOBAL_ALL))
{
*error = zbx_strdup(*error, "Cannot initialize cURL library");
return FAIL;
}
data = (zbx_elastic_data_t *)zbx_malloc(NULL, sizeof(zbx_elastic_data_t));
memset(data, 0, sizeof(zbx_elastic_data_t));
data->base_url = zbx_strdup(NULL, CONFIG_HISTORY_STORAGE_URL);
zbx_rtrim(data->base_url, "/");
data->buf = NULL;
data->post_url = NULL;
data->handle = NULL;
hist->value_type = value_type;
hist->data.elastic_data = data;
hist->destroy = elastic_destroy;
hist->add_values = elastic_add_values;
hist->flush = elastic_flush;
hist->get_values = elastic_get_values;
hist->requires_trends = 0;
return SUCCEED;
}
/************************************************************************************
* *
* Purpose: queries elastic search version and extracts the numeric version from *
* the response string *
* *
************************************************************************************/
void zbx_elastic_version_extract(struct zbx_json *json, int *result)
{
#define RIGHT2(x) ((int)((zbx_uint32_t)(x) - ((zbx_uint32_t)((x)/100))*100))
zbx_httppage_t page;
struct zbx_json_parse jp, jp_values, jp_sub;
struct curl_slist *curl_headers;
CURLcode err;
CURLoption opt;
CURL *handle;
size_t version_len = 0;
char *version_friendly = NULL, errbuf[CURL_ERROR_SIZE];
int major_num, minor_num, increment_num, ret = FAIL;
zbx_uint32_t version;
struct zbx_db_version_info_t db_version_info = {0};
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
memset(&page, 0, sizeof(zbx_httppage_t));
if (0 != curl_global_init(CURL_GLOBAL_ALL))
{
zabbix_log(LOG_LEVEL_WARNING, "cannot initialize cURL library");
goto out;
}
if (NULL == (handle = curl_easy_init()))
{
zabbix_log(LOG_LEVEL_WARNING, "cannot initialize cURL session");
goto out;
}
curl_headers = curl_slist_append(NULL, "Content-Type: application/json");
if (CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_URL, CONFIG_HISTORY_STORAGE_URL)) ||
CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_WRITEFUNCTION, curl_write_cb)) ||
CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_WRITEDATA, &page)) ||
CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_HTTPHEADER, curl_headers)) ||
CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_FAILONERROR, 1L)) ||
CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_ERRORBUFFER, errbuf)) ||
CURLE_OK != (err = curl_easy_setopt(handle, opt = ZBX_CURLOPT_ACCEPT_ENCODING, "")))
{
zabbix_log(LOG_LEVEL_WARNING, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto clean;
}
#if LIBCURL_VERSION_NUM >= 0x071304
/* CURLOPT_PROTOCOLS is supported starting with version 7.19.4 (0x071304) */
if (CURLE_OK != (err = curl_easy_setopt(handle, opt = CURLOPT_PROTOCOLS,
CURLPROTO_HTTP | CURLPROTO_HTTPS)))
{
zabbix_log(LOG_LEVEL_WARNING, "cannot set cURL option %d: [%s]", (int)opt, curl_easy_strerror(err));
goto clean;
}
#endif
*errbuf = '\0';
if (CURLE_OK != (err = curl_easy_perform(handle)))
{
elastic_log_error(handle, err, errbuf);
goto clean;
}
if (SUCCEED != zbx_json_open(page.data, &jp) ||
SUCCEED != zbx_json_brackets_open(jp.start, &jp_values) ||
SUCCEED != zbx_json_brackets_by_name(&jp_values, "version", &jp_sub) ||
SUCCEED != zbx_json_value_by_name_dyn(&jp_sub, "number", &version_friendly, &version_len, NULL))
{
goto clean;
}
ret = SUCCEED;
clean:
curl_slist_free_all(curl_headers);
curl_easy_cleanup(handle);
out:
if (FAIL == ret)
{
zabbix_log(LOG_LEVEL_CRIT, "Failed to extract ElasticDB version");
version = ZBX_DBVERSION_UNDEFINED;
}
else
{
zabbix_log(LOG_LEVEL_DEBUG, "ElasticDB version retrieved unparsed: %s", version_friendly);
if (3 != sscanf(version_friendly, "%d.%d.%d", &major_num, &minor_num, &increment_num) ||
major_num >= 100 || major_num <= 0 || minor_num >= 100 || minor_num < 0 ||
increment_num >= 100 || increment_num < 0)
{
zabbix_log(LOG_LEVEL_WARNING, "Failed to detect ElasticDB version from the "
"following query result: %s", version_friendly);
version = ZBX_DBVERSION_UNDEFINED;
}
else
{
version = major_num * 10000 + minor_num * 100 + increment_num;
}
}
db_version_info.database = "ElasticDB";
db_version_info.friendly_current_version = version_friendly;
db_version_info.friendly_min_version = ZBX_ELASTIC_MIN_VERSION_STR;
db_version_info.friendly_max_version = ZBX_ELASTIC_MAX_VERSION_STR;
db_version_info.friendly_min_supported_version = NULL;
db_version_info.flag = zbx_db_version_check(db_version_info.database, version, ZBX_ELASTIC_MIN_VERSION,
ZBX_ELASTIC_MAX_VERSION, ZBX_DBVERSION_UNDEFINED);
if (DB_VERSION_HIGHER_THAN_MAXIMUM == db_version_info.flag)
{
if (0 == CONFIG_ALLOW_UNSUPPORTED_DB_VERSIONS)
{
zabbix_log(LOG_LEVEL_ERR, " ");
zabbix_log(LOG_LEVEL_ERR, "Unable to start Zabbix server due to unsupported %s database server"
" version (%s).", db_version_info.database,
db_version_info.friendly_current_version);
zabbix_log(LOG_LEVEL_ERR, "Must be up to (%s).",
db_version_info.friendly_max_version);
zabbix_log(LOG_LEVEL_ERR, "Use of supported database version is highly recommended.");
zabbix_log(LOG_LEVEL_ERR, "Override by setting AllowUnsupportedDBVersions=1"
" in Zabbix server configuration file at your own risk.");
zabbix_log(LOG_LEVEL_ERR, " ");
db_version_info.flag = DB_VERSION_HIGHER_THAN_MAXIMUM_ERROR;
*result = FAIL;
}
else
{
zabbix_log(LOG_LEVEL_ERR, " ");
zabbix_log(LOG_LEVEL_ERR, "Warning! Unsupported %s database server version (%s).",
db_version_info.database, db_version_info.friendly_current_version);
zabbix_log(LOG_LEVEL_ERR, "Use of supported database version is highly recommended.");
zabbix_log(LOG_LEVEL_ERR, " ");
db_version_info.flag = DB_VERSION_HIGHER_THAN_MAXIMUM_WARNING;
}
}
db_version_info.history_pk = 0;
zbx_db_version_json_create(json, &db_version_info);
ZBX_ELASTIC_SVERSION = version;
zbx_free(version_friendly);
zbx_free(page.data);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s version:%lu", __func__, zbx_result_string(ret),
(unsigned long)version);
}
zbx_uint32_t zbx_elastic_version_get(void)
{
return ZBX_ELASTIC_SVERSION;
}
#else
int zbx_history_elastic_init(zbx_history_iface_t *hist, unsigned char value_type, char **error)
{
ZBX_UNUSED(hist);
ZBX_UNUSED(value_type);
*error = zbx_strdup(*error, "cURL library support >= 7.28.0 is required for Elasticsearch history backend");
return FAIL;
}
void zbx_elastic_version_extract(struct zbx_json *json, int *result)
{
ZBX_UNUSED(json);
ZBX_UNUSED(result);
}
zbx_uint32_t zbx_elastic_version_get(void)
{
return ZBX_DBVERSION_UNDEFINED;
}
#endif