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<?php |
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|
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declare(strict_types=1); |
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|
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namespace Prometheus; |
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|
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use Decalog\System\Environment; |
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use Decalog\System\Blog; |
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|
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class RenderLineFormat implements RendererInterface { |
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|
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/** |
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* The array of tag names. |
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* |
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* @since 3.0.0 |
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* @var array $tagnames The tag names. |
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*/ |
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private $tagnames = []; |
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|
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/** |
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* The array of tag values. |
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* |
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* @since 3.0.0 |
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* @var array $tagvalues The tag values. |
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*/ |
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private $tagvalues = []; |
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|
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/** |
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* @param MetricFamilySamples[] $metrics |
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* @return string |
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*/ |
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public function render( array $metrics ): string { |
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$this->tagnames = [ |
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'instance', |
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'version', |
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]; |
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$this->tagvalues = [ |
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gethostname(), |
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Environment::wordpress_version_text( true ), |
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]; |
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if ( Environment::is_wordpress_multisite() ) { |
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$this->tagnames[] = 'site'; |
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$this->tagvalues[] = Blog::get_current_blog_id( 0 ); |
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} |
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$lines = []; |
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foreach ( $metrics as $metric ) { |
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foreach ( $metric->getSamples() as $sample ) { |
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$lines[] = $this->renderSample( $metric, $sample ); |
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} |
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} |
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return implode( "\n", $lines ) . "\n"; |
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} |
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|
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/** |
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* @param MetricFamilySamples $metric |
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* @param Sample $sample |
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* @return string |
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*/ |
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private function renderSample( MetricFamilySamples $metric, Sample $sample ): string { |
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$measurement = ''; |
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$metricname = ''; |
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foreach ( explode( '_', $sample->getName() ) as $i => $k ) { |
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if ( $i < 3 ) { |
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$measurement .= ( '' === $measurement ? '' : '_' ) . $k; |
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} else { |
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$metricname .= ( '' === $metricname ? '' : '_' ) . $k; |
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} |
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} |
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$labelNames = $metric->getLabelNames(); |
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if ( $metric->hasLabelNames() || $sample->hasLabelNames() ) { |
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$escapedLabels = $this->escapeAllLabels( $labelNames, $sample ); |
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$measurement .= ',' . implode( ',', $escapedLabels ); |
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} |
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return $measurement . ' ' . $metricname . '=' . $sample->getValue(); |
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} |
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|
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/** |
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* @param string $v |
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* @return string |
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*/ |
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private function escapeLabelValue( string $v ): string { |
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return str_replace( [ '\\', "\n", '"', ' ', '=', ',' ], [ '\\\\', "\\n", '\\"', '\\ ', '', '' ], $v ); |
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} |
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|
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/** |
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* @param string[] $labelNames |
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* @param Sample $sample |
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* |
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* @return string[] |
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*/ |
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private function escapeAllLabels( array $labelNames, Sample $sample ): array { |
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$escapedLabels = []; |
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$labels = array_combine( array_merge( $labelNames, $sample->getLabelNames(), $this->tagnames ), array_merge( $sample->getLabelValues(), $this->tagvalues ) ); |
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if ( $labels === false ) { |
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return []; |
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} |
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foreach ( $labels as $labelName => $labelValue ) { |
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$escapedLabels[] = $labelName . '=' . $this->escapeLabelValue( (string) $labelValue ); |
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} |
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return $escapedLabels; |
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} |
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} |
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|
