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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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class RenderTextFormat implements RendererInterface |
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{ |
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const MIME_TYPE = 'text/plain; version=0.0.4'; |
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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 $metrics): string |
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{ |
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usort($metrics, function (MetricFamilySamples $a, MetricFamilySamples $b): int { |
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return strcmp($a->getName(), $b->getName()); |
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}); |
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|
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$lines = []; |
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foreach ($metrics as $metric) { |
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$lines[] = "# HELP " . $metric->getName() . " {$metric->getHelp()}"; |
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$lines[] = "# TYPE " . $metric->getName() . " {$metric->getType()}"; |
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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 $sample): string |
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{ |
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$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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return $sample->getName() . '{' . implode(',', $escapedLabels) . '} ' . $sample->getValue(); |
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} |
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return $sample->getName() . ' ' . $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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{ |
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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 $sample): array |
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{ |
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$escapedLabels = []; |
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|
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$labels = array_combine(array_merge($labelNames, $sample->getLabelNames()), $sample->getLabelValues()); |
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|
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if ($labels === false) { |
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return []; |
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} |
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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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|
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return $escapedLabels; |
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} |
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} |
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|
