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TimingMetric.php
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TimingMetric.php
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<?php
/**
* 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
*/
declare( strict_types=1 );
namespace Wikimedia\Stats\Metrics;
use Wikimedia\Stats\Exceptions\IllegalOperationException;
use Wikimedia\Stats\Sample;
/**
* Timing Metric Implementation
*
* Timing metrics track duration data which can be broken into histograms.
* They are identified by type "ms".
*
* @author Cole White
* @since 1.38
*/
class TimingMetric implements MetricInterface {
use MetricTrait;
/**
* The StatsD protocol type indicator:
* https://github.com/statsd/statsd/blob/v0.9.0/docs/metric_types.md
* https://docs.datadoghq.com/developers/dogstatsd/datagram_shell/?tab=metrics
*/
private const TYPE_INDICATOR = "ms";
private ?float $startTime = null;
/**
* Start the timer.
*
* Example:
*
* ```php
* $timer = StatsFactory->getTiming( 'example_seconds' )
* ->setLabel( 'foo', 'bar' )
* ->start();
* # work to be measured...
* $timer->stop();
* ```
*
* @return $this
*/
public function start() {
$this->startTime = hrtime( true );
return $this;
}
/**
* Stop the running timer.
*/
public function stop(): void {
if ( $this->startTime === null ) {
trigger_error( "Stats: stop() called before start() for metric '{$this->getName()}'", E_USER_WARNING );
return;
}
$this->observeNanoseconds( hrtime( true ) - $this->startTime );
$this->startTime = null;
}
/**
* Record a previously calculated observation in nanoseconds.
*
* Example:
*
* ```php
* $startTime = hrtime( true )
* # work to be measured...
* $metric->observeNanoseconds( hrtime( true ) - $startTime )
* ```
*
* @param float $nanoseconds
* @return void
* @since 1.43
*/
public function observeNanoseconds( float $nanoseconds ): void {
$this->addSample( $nanoseconds * 1e-6 );
}
/**
* Record a previously calculated observation in seconds.
*
* This method is provided for tracking externally-generated values, timestamp deltas, and
* situations where the expected input value is the expected Prometheus graphed value.
*
* Performance measurements in process should be done with hrtime() and observeNanoseconds()
* to ensure monotonic time is used and not wall-clock time.
*
* Example:
*
* ```php
* $startTime = microtime( true )
* # work to be measured...
* $metric->observeSeconds( microtime( true ) - $startTime )
* ```
*
* @param float $seconds
* @return void
* @since 1.43
*/
public function observeSeconds( float $seconds ): void {
$this->addSample( $seconds * 1000 );
}
/**
* Record a previously calculated observation in milliseconds.
*
* NOTE: You MUST pass values converted to milliseconds.
*
* This method is discouraged in new code, because PHP does not measure
* time in milliseconds. It will be less error-prone if you use start()
* and stop(), or pass values from hrtime() directly to observeNanoseconds()
* without manual multiplication to another unit.
*
* @param float $milliseconds
* @return void
*/
public function observe( float $milliseconds ): void {
$this->addSample( $milliseconds );
}
private function addSample( float $milliseconds ): void {
foreach ( $this->baseMetric->getStatsdNamespaces() as $namespace ) {
$this->baseMetric->getStatsdDataFactory()->timing( $namespace, $milliseconds );
}
try {
$this->baseMetric->addSample( new Sample( $this->baseMetric->getLabelValues(), $milliseconds ) );
} catch ( IllegalOperationException $ex ) {
// Log the condition and give the caller something that will absorb calls.
trigger_error( $ex->getMessage(), E_USER_WARNING );
}
}
/** @inheritDoc */
public function getTypeIndicator(): string {
return self::TYPE_INDICATOR;
}
}

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