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<?php
/*
** Zabbix
** Copyright (C) 2001-2022 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.
**/
/**
* A parser for Prometheus output.
*/
class CPrometheusOutputParser extends CParser {
private $options = [
'usermacros' => false,
'lldmacros' => false
];
private $user_macro_parser;
private $lld_macro_parser;
private $lld_macro_function_parser;
public function __construct($options = []) {
if (array_key_exists('usermacros', $options)) {
$this->options['usermacros'] = $options['usermacros'];
}
if (array_key_exists('lldmacros', $options)) {
$this->options['lldmacros'] = $options['lldmacros'];
}
if ($this->options['usermacros']) {
$this->user_macro_parser = new CUserMacroParser();
}
if ($this->options['lldmacros']) {
$this->lld_macro_parser = new CLLDMacroParser();
$this->lld_macro_function_parser = new CLLDMacroFunctionParser();
}
}
/**
* Parse the given source string.
*
* @param string $source Source string that needs to be parsed.
* @param int $pos Position offset.
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$p = $pos;
if (!$this->parseLabelName($source, $p)) {
return self::PARSE_FAIL;
}
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
return isset($source[$p]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
}
/**
* Parse label names. It must follow the [a-zA-Z_][a-zA-Z0-9_]* regular expression. User macros and LLD macros
* are allowed.
*
* @param string $source [IN] Source string that needs to be parsed.
* @param int $pos [IN/OUT] Position offset.
*
* @return bool
*/
private function parseLabelName($source, &$pos) {
if (preg_match('/^[a-zA-Z_][a-zA-Z0-9_]*/', substr($source, $pos), $matches)) {
$pos += strlen($matches[0]);
return true;
}
elseif ($this->options['usermacros'] && $this->user_macro_parser->parse($source, $pos) != self::PARSE_FAIL) {
$pos += $this->user_macro_parser->getLength();
return true;
}
elseif ($this->options['lldmacros'] && $this->lld_macro_parser->parse($source, $pos) != self::PARSE_FAIL) {
$pos += $this->lld_macro_parser->getLength();
return true;
}
elseif ($this->options['lldmacros']
&& $this->lld_macro_function_parser->parse($source, $pos) != self::PARSE_FAIL) {
$pos += $this->lld_macro_function_parser->getLength();
return true;
}
return false;
}
}
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