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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\Emitters;
use InvalidArgumentException;
use UDPTransport;
use Wikimedia\Stats\Formatters\FormatterInterface;
use Wikimedia\Stats\Metrics\NullMetric;
use Wikimedia\Stats\StatsCache;
use Wikimedia\Stats\StatsUtils;
/**
* Metrics UDP Emitter Implementation
*
* Leverages UDPTransport to emit wire-formatted metrics.
*
* @author Cole White
* @since 1.41
*/
class UDPEmitter implements EmitterInterface {
private string $prefix;
private StatsCache $cache;
private FormatterInterface $formatter;
private ?UDPTransport $transport;
private int $payloadSize;
public function __construct( string $prefix, StatsCache $cache, FormatterInterface $formatter, ?string $target ) {
$this->prefix = $this->normalizePrefix( $prefix );
$this->cache = $cache;
$this->formatter = $formatter;
$this->transport = $target ? UDPTransport::newFromString( $target ) : null;
$this->payloadSize = UDPTransport::MAX_PAYLOAD_SIZE;
}
/**
* Sets payload size for batching.
*
* @param int $payloadSize
* @return UDPEmitter
*/
public function withPayloadSize( int $payloadSize ): UDPEmitter {
$this->payloadSize = $payloadSize;
return $this;
}
/**
* Overrides the transport.
*
* @param UDPTransport $transport
* @return UDPEmitter
*/
public function withTransport( UDPTransport $transport ): UDPEmitter {
$this->transport = $transport;
return $this;
}
private function normalizePrefix( string $prefix ): string {
if ( $prefix === '' ) {
throw new InvalidArgumentException( 'UDPEmitter: Prefix cannot be empty.' );
}
return StatsUtils::normalizeString( $prefix );
}
/**
* Renders metrics and samples through the formatter and returns a string[] of wire-formatted metric samples.
*/
private function render(): array {
$output = [];
foreach ( $this->cache->getAllMetrics() as $metric ) {
// Skip NullMetric instances.
if ( get_class( $metric ) === NullMetric::class ) {
continue;
}
foreach ( $this->formatter->getFormattedSamples( $this->prefix, $metric ) as $formatted ) {
$output[] = $formatted;
}
}
return $output;
}
/**
* Batch the array of samples into payload of payloadSize and
* emit them via the configured transport.
*
* @param array $samples
* @param int $payloadSize
* @return void
*/
private function batch( array $samples, int $payloadSize ): void {
$payload = '';
foreach ( $samples as $sample ) {
if ( strlen( $payload ) + strlen( $sample ) + 1 > $payloadSize ) {
// Send this payload and make a new one
$this->transport->emit( $payload );
$payload = '';
}
$payload .= $sample . "\n";
}
// Send what is left in the payload
if ( strlen( $payload ) > 0 ) {
$this->transport->emit( $payload );
}
}
/**
* @inheritDoc
*/
public function send(): void {
$this->batch( $this->render(), $this->payloadSize );
}
}
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