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131 lines
3.5 KiB
131 lines
3.5 KiB
<?php
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* Class to convert calculated item keys.
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*/
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class C52CalculatedItemConverter extends C52TriggerExpressionConverter {
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/**
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* Item key parser.
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*
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* @var CItemKey
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*/
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protected $item_key_parser;
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/**
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* Function parser.
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*
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* @var C10FunctionParser
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*/
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protected $function_parser;
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public function __construct() {
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$this->parser = new C10TriggerExpression([
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'allow_func_only' => true,
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'calculated' => true
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]);
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$this->item_key_parser = new CItemKey();
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$this->function_parser = new C10FunctionParser();
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$this->standalone_functions = getStandaloneFunctions();
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}
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/**
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* Convert calculated item formula to 5.4 syntax.
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*
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* @param string $formula Calculated item formula to convert.
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*
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* @return string
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*/
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public function convert($item) {
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$expression = preg_replace("/[\\r\\n\\t]/", '', $item['params']);
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if ($this->parser->parse($expression) === false) {
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return $item;
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}
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$functions = $this->parser->result->getTokensByType(C10TriggerExprParserResult::TOKEN_TYPE_FUNCTION);
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$this->hanged_refs = $this->checkHangedFunctionsPerHost($functions);
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for ($i = count($functions) - 1; $i >= 0; $i--) {
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$fn = $functions[$i]['data'] + ['host' => '', 'item' => ''];
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$query = $fn['functionParams'][0];
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$colon_pos = strpos($query, ':');
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$bracket_pos = strpos($query, '[');
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if ($colon_pos !== false && ($bracket_pos === false || $colon_pos < $bracket_pos)) {
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list($host_name, $item_key) = explode(':', $query, 2);
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}
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else {
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$host_name = '';
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$item_key = $query;
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}
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if ($this->item_key_parser->parse($item_key) === CParser::PARSE_SUCCESS) {
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array_shift($fn['functionParams']);
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array_shift($fn['functionParamsRaw']['parameters']);
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[$new_expr] = $this->convertFunction($fn, $host_name, $item_key);
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$expression = substr_replace($expression, $new_expr, $functions[$i]['pos'], $functions[$i]['length']);
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}
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}
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$item['params'] = $expression;
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return $item;
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}
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/**
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* Check if each particular host reference would be linked through at least one functions according to the new
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* trigger expression syntax.
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*
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* @param array $tokens
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*
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* @return array
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*/
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protected function checkHangedFunctionsPerHost(array $tokens): array {
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$hanged_refs = ['' => false];
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foreach ($tokens as $token) {
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$host_name = '';
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$fn = $token['data'];
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$item_key = $fn['functionParams'][0];
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$host_delimiter_pos = strpos($item_key, ':');
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if ($host_delimiter_pos === false || $host_delimiter_pos > strpos($item_key, '[')) {
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continue;
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}
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$host_name = substr($item_key, 0, $host_delimiter_pos);
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if (!array_key_exists($host_name, $hanged_refs)) {
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$hanged_refs[$host_name] = false;
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}
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if (!in_array($fn['functionName'], $this->standalone_functions)) {
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$hanged_refs[$host_name] = true;
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}
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}
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return $hanged_refs;
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}
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}
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