114 lines
3.3 KiB
PHP
114 lines
3.3 KiB
PHP
<?php
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/**
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* RrdDefinition.php
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*
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* Build a RRD definition.
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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 <http://www.gnu.org/licenses/>.
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*
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* @package LibreNMS
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* @link http://librenms.org
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* @copyright 2017 Tony Murray
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* @author Tony Murray <murraytony@gmail.com>
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*/
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namespace LibreNMS\RRD;
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use LibreNMS\Exceptions\InvalidRrdTypeException;
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class RrdDefinition
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{
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private static $types = array('GAUGE', 'DERIVE', 'COUNTER', 'ABSOLUTE', 'DCOUNTER', 'DDERIVE');
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private $dataSets = array();
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/**
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* Make a new empty RrdDefinition
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*/
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public static function make()
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{
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return new self();
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}
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/**
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* Add a dataset to this definition.
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* See https://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html for more information.
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*
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* @param string $name Textual name for this dataset. Must be [a-zA-Z0-9_], max length 19.
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* @param string $type GAUGE | COUNTER | DERIVE | DCOUNTER | DDERIVE | ABSOLUTE.
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* @param int $min Minimum allowed value. null means undefined.
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* @param int $max Maximum allowed value. null means undefined.
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* @param int $heartbeat Heartbeat for this dataset. Uses the global setting if null.
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* @return RrdDefinition
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*/
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public function addDataset($name, $type, $min = null, $max = null, $heartbeat = null)
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{
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global $config;
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if (empty($name)) {
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d_echo("DS must be set to a non-empty string.");
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}
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$ds = array();
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$ds[] = $this->escapeName($name);
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$ds[] = $this->checkType($type);
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$ds[] = is_null($heartbeat) ? $config['rrd']['heartbeat'] : $heartbeat;
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$ds[] = is_null($min) ? 'U' : $min;
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$ds[] = is_null($max) ? 'U' : $max;
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$this->dataSets[] = $ds;
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return $this;
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}
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/**
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* Get the RRD Definition as it would be passed to rrdtool
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*
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* @return string
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*/
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public function __toString()
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{
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return array_reduce($this->dataSets, function ($carry, $ds) {
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return $carry . 'DS:' . implode(':', $ds) . ' ';
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}, '');
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}
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/**
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* Check that the data set type is valid.
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*
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* @param string $type
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* @return mixed
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* @throws InvalidRrdTypeException
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*/
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private function checkType($type)
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{
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if (!in_array($type, self::$types)) {
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$msg = "$type is not valid, must be: " . implode(' | ', self::$types);
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throw new InvalidRrdTypeException($msg);
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}
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return $type;
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}
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/**
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* Remove all invalid characters from the name and truncate to 19 characters.
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*
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* @param string $name
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* @return string
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*/
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private function escapeName($name)
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{
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$name = preg_replace('/[^a-zA-Z0-9_\-]/', '', $name);
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return substr($name, 0, 19);
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}
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}
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