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1<?php
2/**
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 * http://www.gnu.org/copyleft/gpl.html
17 * @file
18 */
19
20declare( strict_types=1 );
21
22namespace Wikimedia\Stats\Metrics;
23
24use InvalidArgumentException;
25use Psr\Log\LoggerInterface;
26use Wikimedia\Stats\Exceptions\IllegalOperationException;
27use Wikimedia\Stats\Sample;
28
29/**
30 * Gauge Metric Implementation
31 *
32 * Gauge Metrics can be set to any numeric value and are identified by type "g".
33 *
34 * @author Cole White
35 * @since 1.38
36 */
37class GaugeMetric implements MetricInterface {
38
39    /**
40     * The StatsD protocol type indicator:
41     * https://github.com/statsd/statsd/blob/v0.9.0/docs/metric_types.md
42     * https://docs.datadoghq.com/developers/dogstatsd/datagram_shell/?tab=metrics
43     *
44     * @var string
45     */
46    private const TYPE_INDICATOR = "g";
47
48    /** @var BaseMetricInterface */
49    private BaseMetricInterface $baseMetric;
50
51    /** @var LoggerInterface */
52    private LoggerInterface $logger;
53
54    /** @inheritDoc */
55    public function __construct( $baseMetric, $logger ) {
56        $this->baseMetric = $baseMetric;
57        $this->logger = $logger;
58    }
59
60    /**
61     * Sets metric to value.
62     *
63     * @param float $value
64     * @return void
65     */
66    public function set( float $value ): void {
67        foreach ( $this->baseMetric->getStatsdNamespaces() as $namespace ) {
68            $this->baseMetric->getStatsdDataFactory()->updateCount( $namespace, $value );
69        }
70
71        try {
72            $this->baseMetric->addSample( new Sample( $this->baseMetric->getLabelValues(), $value ) );
73        } catch ( IllegalOperationException $ex ) {
74            // Log the condition and give the caller something that will absorb calls.
75            trigger_error( $ex->getMessage(), E_USER_WARNING );
76        }
77    }
78
79    /** @inheritDoc */
80    public function getName(): string {
81        return $this->baseMetric->getName();
82    }
83
84    /** @inheritDoc */
85    public function getComponent(): string {
86        return $this->baseMetric->getComponent();
87    }
88
89    /** @inheritDoc */
90    public function getTypeIndicator(): string {
91        return self::TYPE_INDICATOR;
92    }
93
94    /** @inheritDoc */
95    public function getSamples(): array {
96        return $this->baseMetric->getSamples();
97    }
98
99    /** @inheritDoc */
100    public function getSampleCount(): int {
101        return $this->baseMetric->getSampleCount();
102    }
103
104    /** @inheritDoc */
105    public function getSampleRate(): float {
106        return $this->baseMetric->getSampleRate();
107    }
108
109    /** @inheritDoc */
110    public function setSampleRate( float $sampleRate ) {
111        try {
112            $this->baseMetric->setSampleRate( $sampleRate );
113        } catch ( IllegalOperationException | InvalidArgumentException $ex ) {
114            // Log the condition and give the caller something that will absorb calls.
115            trigger_error( $ex->getMessage(), E_USER_WARNING );
116            return new NullMetric;
117        }
118        return $this;
119    }
120
121    /** @inheritDoc */
122    public function getLabelKeys(): array {
123        return $this->baseMetric->getLabelKeys();
124    }
125
126    /** @inheritDoc */
127    public function setLabel( string $key, string $value ) {
128        try {
129            $this->baseMetric->addLabel( $key, $value );
130        } catch ( IllegalOperationException | InvalidArgumentException $ex ) {
131            // Log the condition and give the caller something that will absorb calls.
132            trigger_error( $ex->getMessage(), E_USER_WARNING );
133            return new NullMetric;
134        }
135        return $this;
136    }
137
138    /** @inheritDoc */
139    public function copyToStatsdAt( $statsdNamespaces ) {
140        try {
141            $this->baseMetric->setStatsdNamespaces( $statsdNamespaces );
142        } catch ( InvalidArgumentException $ex ) {
143            // Log the condition and give the caller something that will absorb calls.
144            trigger_error( $ex->getMessage(), E_USER_WARNING );
145            return new NullMetric;
146        }
147        return $this;
148    }
149
150    /** @inheritDoc */
151    public function fresh(): GaugeMetric {
152        $this->baseMetric->clearLabels();
153        return $this;
154    }
155}