116 lines
4.0 KiB
PHP
116 lines
4.0 KiB
PHP
<?php
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/**
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* AlertDB.php
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*
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* Extending the built in logging to add an event logger function
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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 3 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, see <https://www.gnu.org/licenses/>.
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*
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*
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* Original code:
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* @author Daniel Preussker <f0o@devilcode.org>
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* @copyright 2014 f0o, LibreNMS
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* @license GPL
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*
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* Modified by:
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* @link https://www.librenms.org
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* @copyright 2019 KanREN, Inc.
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* @author Heath Barnhart <hbarnhart@kanren.net>
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*/
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namespace LibreNMS\Alert;
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use LibreNMS\Alerting\QueryBuilderParser;
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class AlertDB
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{
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/**
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* @param $rule
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* @param $query_builder
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* @return bool|string
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*/
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public static function genSQL($rule, $query_builder = false)
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{
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if ($query_builder) {
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return QueryBuilderParser::fromJson($query_builder)->toSql();
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} else {
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return self::genSQLOld($rule);
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}
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}
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/**
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* Generate SQL from Rule
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* @param string $rule Rule to generate SQL for
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* @return string|bool
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*/
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public static function genSQLOld($rule)
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{
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$rule = AlertUtil::runMacros($rule);
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if (empty($rule)) {
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//Cannot resolve Macros due to recursion. Rule is invalid.
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return false;
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}
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//Pretty-print rule to dissect easier
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$pretty = ['&&' => ' && ', '||' => ' || '];
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$rule = str_replace(array_keys($pretty), $pretty, $rule);
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$tmp = explode(' ', $rule);
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$tables = [];
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foreach ($tmp as $opt) {
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if (strstr($opt, '%') && strstr($opt, '.')) {
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$tmpp = explode('.', $opt, 2);
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$tmpp[0] = str_replace('%', '', $tmpp[0]);
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$tables[] = mres(str_replace('(', '', $tmpp[0]));
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$rule = str_replace($opt, $tmpp[0] . '.' . $tmpp[1], $rule);
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}
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}
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$tables = array_keys(array_flip($tables));
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if (dbFetchCell('SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_NAME = ? && COLUMN_NAME = ?', [$tables[0], 'device_id']) != 1) {
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//Our first table has no valid glue, append the 'devices' table to it!
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array_unshift($tables, 'devices');
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}
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$x = sizeof($tables) - 1;
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$i = 0;
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$join = '';
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while ($i < $x) {
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if (isset($tables[$i + 1])) {
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$gtmp = ResolveGlues([$tables[$i + 1]], 'device_id');
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if ($gtmp === false) {
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//Cannot resolve glue-chain. Rule is invalid.
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return false;
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}
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$last = '';
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$qry = '';
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foreach ($gtmp as $glue) {
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if (empty($last)) {
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[$tmp,$last] = explode('.', $glue);
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$qry .= $glue . ' = ';
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} else {
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[$tmp,$new] = explode('.', $glue);
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$qry .= $tmp . '.' . $last . ' && ' . $tmp . '.' . $new . ' = ';
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$last = $new;
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}
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if (! in_array($tmp, $tables)) {
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$tables[] = $tmp;
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}
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}
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$join .= '( ' . $qry . $tables[0] . '.device_id ) && ';
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}
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$i++;
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}
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$sql = 'SELECT * FROM ' . implode(',', $tables) . ' WHERE (' . $join . '' . str_replace('(', '', $tables[0]) . '.device_id = ?) && (' . str_replace(['%', '@', '!~', '~'], ['', '.*', 'NOT REGEXP', 'REGEXP'], $rule) . ')';
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return $sql;
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}
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}
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