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<?php |
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namespace Lamoda\Metric\Responder\ResponseFactory; |
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use GuzzleHttp\Psr7\Response; |
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use Lamoda\Metric\Common\MetricSourceInterface; |
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use Lamoda\Metric\Responder\ResponseFactoryInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Creates Prometheus formatted metrics response. |
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*/ |
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final class PrometheusResponseFactory implements ResponseFactoryInterface |
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{ |
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private const FORMAT_LINE = '%s%s %s'; |
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private const LABELS_ENCLOSURE = '{%s}'; |
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private const FORMAT_LABEL = '%s="%s"'; |
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private const GLUE_LABELS = ','; |
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private const GLUE_LINES = PHP_EOL; |
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/** Not `A-Z`, `0-9` or `_`. */ |
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private const PATTERN_FILTER_LABEL_NAME = '/\W/'; |
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private const CONTENT_TYPE = 'text/plain; version=0.0.4'; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function create(MetricSourceInterface $source, array $options = []): ResponseInterface |
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{ |
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$data = []; |
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foreach ($source->getMetrics() as $metric) { |
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$data[] = [ |
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'name' => ($options['prefix'] ?? '') . $metric->getName(), |
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'value' => $metric->resolve(), |
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'tags' => $metric->getTags(), |
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]; |
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} |
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return new Response( |
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200, |
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['Content-Type' => self::CONTENT_TYPE], |
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$this->getContent($data) |
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); |
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} |
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/** |
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* Get response content. |
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* |
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* @param array[] $data |
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* |
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* @return string |
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*/ |
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private function getContent(array $data): string |
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{ |
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$lines = []; |
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foreach ($data as $line) { |
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$lines[] = $this->getLine($line['name'], $line['tags'], $line['value']); |
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} |
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$lines = array_filter($lines); |
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return implode(self::GLUE_LINES, $lines) . PHP_EOL; |
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} |
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/** |
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* Get single line of Prometheus output. |
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* |
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* @param string $name |
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* @param string[] $tags |
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* @param float $value |
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* |
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* @return string |
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*/ |
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private function getLine(string $name, array $tags, float $value): string |
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{ |
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return sprintf(self::FORMAT_LINE, $name, $this->formatLabels($tags), $value); |
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} |
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/** |
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* Get tags string. |
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* |
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* @param array $labels |
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* |
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* @return string |
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*/ |
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private function formatLabels(array $labels): string |
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{ |
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if ($labels === []) { |
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return ''; |
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} |
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$tagsString = []; |
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foreach ($labels as $name => $value) { |
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$name = $this->formatLabelName($name); |
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$value = $this->formatLabelValue($value); |
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$tagsString[] = sprintf(self::FORMAT_LABEL, $name, $value); |
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} |
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return sprintf(self::LABELS_ENCLOSURE, implode(self::GLUE_LABELS, $tagsString)); |
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} |
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/** |
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* Add slashes to values. |
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* |
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* @param $value |
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* |
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* @return mixed |
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*/ |
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private function formatLabelValue(string $value): string |
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{ |
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return addcslashes($value, "\n\"\\"); |
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} |
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/** |
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* Remove unsupported symbols from. |
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* |
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* @param string $name |
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* |
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* @return string |
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*/ |
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private function formatLabelName(string $name): string |
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{ |
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// Only letters, digits and slashes. |
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return preg_replace(self::PATTERN_FILTER_LABEL_NAME, '', $name); |
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} |
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} |
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lamoda /
php-metrics
