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<?php
/**
* Copyright 2015 Ori Livneh
*
* 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.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace Wikimedia\Stats;
use Liuggio\StatsdClient\Entity\StatsdData;
use Liuggio\StatsdClient\Entity\StatsdDataInterface;
use Liuggio\StatsdClient\Factory\StatsdDataFactory;
/**
* MediaWiki's adaption of StatsdDataFactory that provides buffering and metric prefixing.
*
* The buffering functionality exists as a performance optimisation to reduce network
* traffic and StatsD processing by maximally utilizing StatsdClient's ability to
* compress counter increments, and send all data in a few large UDP packets
* over a single connection.
*
* These buffers are sent from MediaWikiEntryPoint::emitBufferedStats. For web requests,
* this happens post-send. For command-line scripts, this happens periodically from a database
* callback (see MWLBFactory::applyGlobalState).
*
* @todo Evaluate upstream's StatsdService class, which implements similar buffering logic
* and was released in statsd-php-client 1.0.13, shortly after we implemented this here
* for statsd-php-client 1.0.12 at the time.
*
* @since 1.25
* @method StatsdData produceStatsdDataEntity() We use StatsdData::setKey, which is not in
* StatsdDataInterface https://gerrit.wikimedia.org/r/643976
*/
class BufferingStatsdDataFactory extends StatsdDataFactory implements IBufferingStatsdDataFactory {
/** @var array */
protected $buffer = [];
/** @var bool */
protected $enabled = true;
/** @var string */
private $prefix;
public function __construct( $prefix ) {
parent::__construct();
$this->prefix = $prefix;
}
//
// Methods for StatsdDataFactoryInterface
//
/**
* @param string $key
* @param float|int $time
* @return void
*/
public function timing( $key, $time ) {
if ( !$this->enabled ) {
return;
}
$this->buffer[] = [ $key, $time, StatsdDataInterface::STATSD_METRIC_TIMING ];
}
/**
* @param string $key
* @param float|int $value
* @return void
*/
public function gauge( $key, $value ) {
if ( !$this->enabled ) {
return;
}
$this->buffer[] = [ $key, $value, StatsdDataInterface::STATSD_METRIC_GAUGE ];
}
/**
* @param string $key
* @param float|int $value
* @return array
*/
public function set( $key, $value ) {
if ( !$this->enabled ) {
return [];
}
$this->buffer[] = [ $key, $value, StatsdDataInterface::STATSD_METRIC_SET ];
return [];
}
/**
* @param string $key
* @return array
*/
public function increment( $key ) {
if ( !$this->enabled ) {
return [];
}
$this->buffer[] = [ $key, 1, StatsdDataInterface::STATSD_METRIC_COUNT ];
return [];
}
/**
* @param string $key
* @return void
*/
public function decrement( $key ) {
if ( !$this->enabled ) {
return;
}
$this->buffer[] = [ $key, -1, StatsdDataInterface::STATSD_METRIC_COUNT ];
}
/**
* @param string $key
* @param int $delta
* @return void
*/
public function updateCount( $key, $delta ) {
if ( !$this->enabled ) {
return;
}
$this->buffer[] = [ $key, $delta, StatsdDataInterface::STATSD_METRIC_COUNT ];
}
/**
* Normalize a metric key for StatsD
*
* The following are changes you may rely on:
*
* - Non-alphanumerical characters are converted to underscores.
* - Empty segments are removed, e.g. "foo..bar" becomes "foo.bar".
* This is mainly for StatsD-Graphite-Carbon setups where each segment is a directory
* and must have a non-empty name.
* - Deliberately invalid input that looks like `__METHOD__` (namespaced PHP class and method)
* is changed from "\\Namespace\\Class::method" to "Namespace_Class.method".
* This is used by ProfilerOutputStats.
*
* @param string $key
* @return string
*/
private static function normalizeMetricKey( $key ) {
$key = strtr( $key, [ '::' => '.' ] );
$key = preg_replace( '/[^a-zA-Z0-9.]+/', '_', $key );
$key = trim( $key, '_.' );
return strtr( $key, [ '..' => '.' ] );
}
public function produceStatsdData(
$key, $value = 1, $metric = StatsdDataInterface::STATSD_METRIC_COUNT
) {
$entity = $this->produceStatsdDataEntity();
if ( $key !== null ) {
$key = self::normalizeMetricKey( "{$this->prefix}.{$key}" );
$entity->setKey( $key );
}
if ( $value !== null ) {
$entity->setValue( $value );
}
if ( $metric !== null ) {
$entity->setMetric( $metric );
}
return $entity;
}
//
// Methods for IBufferingStatsdDataFactory
//
public function hasData() {
return (bool)$this->buffer;
}
/**
* @since 1.30
* @return StatsdData[]
*/
public function getData() {
$data = [];
foreach ( $this->buffer as [ $key, $val, $metric ] ) {
// Optimization: Don't bother transmitting a counter update with a delta of zero
if ( $metric === StatsdDataInterface::STATSD_METRIC_COUNT && !$val ) {
continue;
}
// Optimisation: Avoid produceStatsdData cost during web requests (T288702).
// Instead, we do it here in getData() right before the data is transmitted.
$data[] = $this->produceStatsdData( $key, $val, $metric );
}
return $data;
}
public function clearData() {
$this->buffer = [];
}
public function getDataCount() {
return count( $this->buffer );
}
public function setEnabled( $enabled ) {
$this->enabled = $enabled;
}
}
/** @deprecated class alias since 1.43 */
class_alias( BufferingStatsdDataFactory::class, 'BufferingStatsdDataFactory' );