includes/libs/BufferingStatsdDataFactory.php

   1 <?php
   2 /**
   3  * Copyright 2015
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use Liuggio\StatsdClient\Entity\StatsdData;
  24 use Liuggio\StatsdClient\Entity\StatsdDataInterface;
  25 use Liuggio\StatsdClient\Factory\StatsdDataFactory;
  26
  27 /**
  28  * A factory for application metric data.
  29  *
  30  * This class prepends a context-specific prefix to each metric key and keeps
  31  * a reference to each constructed metric in an internal array buffer.
  32  *
  33  * @since 1.25
  34  */
  35 class BufferingStatsdDataFactory extends StatsdDataFactory {
  36         protected $buffer = [];
  37
  38         public function __construct( $prefix ) {
  39                 parent::__construct();
  40                 $this->prefix = $prefix;
  41         }
  42
  43         /**
  44          * Normalize a metric key for StatsD
  45          *
  46          * Replace occurences of '::' with dots and any other non-alphanumeric
  47          * characters with underscores. Combine runs of dots or underscores.
  48          * Then trim leading or trailing dots or underscores.
  49          *
  50          * @param string $key
  51          * @since 1.26
  52          */
  53         private static function normalizeMetricKey( $key ) {
  54                 $key = preg_replace( '/[:.]+/', '.', $key );
  55                 $key = preg_replace( '/[^a-z0-9.]+/i', '_', $key );
  56                 $key = trim( $key, '_.' );
  57                 return str_replace( [ '._', '_.' ], '.', $key );
  58         }
  59
  60         public function produceStatsdData(
  61                 $key, $value = 1, $metric = StatsdDataInterface::STATSD_METRIC_COUNT
  62         ) {
  63                 $entity = $this->produceStatsdDataEntity();
  64                 if ( $key !== null ) {
  65                         $key = self::normalizeMetricKey( "{$this->prefix}.{$key}" );
  66                         $entity->setKey( $key );
  67                 }
  68                 if ( $value !== null ) {
  69                         $entity->setValue( $value );
  70                 }
  71                 if ( $metric !== null ) {
  72                         $entity->setMetric( $metric );
  73                 }
  74                 // Don't bother buffering a counter update with a delta of zero.
  75                 if ( !( $metric === StatsdDataInterface::STATSD_METRIC_COUNT && !$value ) ) {
  76                         $this->buffer[] = $entity;
  77                 }
  78                 return $entity;
  79         }
  80
  81         /**
  82          * @return StatsdData[]
  83          */
  84         public function getBuffer() {
  85                 return $this->buffer;
  86         }
  87 }