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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\MetricInterface; |
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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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final class TelegrafJsonResponseFactory implements ResponseFactoryInterface |
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{ |
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private const CONTENT_TYPE = 'application/json'; |
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/** {@inheritdoc} */ |
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public function create(MetricSourceInterface $source, array $options = []): ResponseInterface |
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{ |
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$normalizedGroups = []; |
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$groups = $this->arrangeGroups($source, $options); |
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foreach ($groups as $name => $group) { |
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$normalizedGroups[$name] = $this->formatGroup($group, $options); |
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} |
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$normalizedGroups = array_values(array_filter($normalizedGroups)); |
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if (array_keys($normalizedGroups) === [0]) { |
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$normalizedGroups = $normalizedGroups[0]; |
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} |
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return new Response( |
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200, |
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['Content-Type' => self::CONTENT_TYPE], |
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json_encode($normalizedGroups) |
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); |
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} |
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private function formatGroup(array $source, array $options): array |
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{ |
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$result = []; |
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$prefix = $options['prefix'] ?? ''; |
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foreach ($source as $metric) { |
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$result[$prefix . $metric->getName()] = $metric->resolve(); |
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} |
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if (!empty($options['propagate_tags'])) { |
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$this->propagateTags($result, $source, $options['propagate_tags']); |
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} |
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return $result; |
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} |
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/** |
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* @param array $result |
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* @param MetricInterface[] $source |
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* @param string[] $propagatedTags |
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*/ |
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private function propagateTags(array &$result, array $source, array $propagatedTags): void |
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{ |
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foreach ($source as $metric) { |
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foreach ($metric->getTags() as $tag => $value) { |
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if (\in_array($tag, $propagatedTags, true)) { |
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$result[$tag] = (string) $value; |
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} |
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} |
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} |
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} |
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/** |
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* @param MetricSourceInterface $source |
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* @param array $options |
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* |
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* @return MetricInterface[][] |
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*/ |
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private function arrangeGroups(MetricSourceInterface $source, array $options): array |
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{ |
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$groups = []; |
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if (empty($options['group_by_tags'])) { |
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$groups[0] = iterator_to_array($source->getMetrics(), false); |
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return $groups; |
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} |
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$tags = (array) $options['group_by_tags']; |
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foreach ($source->getMetrics() as $metric) { |
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$vector = []; |
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foreach ($tags as $tag) { |
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$vector[] = $metric->getTags()[$tag] ?? '__'; |
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} |
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$groups[$this->createTagVector(...$vector)][] = $metric; |
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} |
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return array_values($groups); |
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} |
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private function createTagVector(string ...$values) |
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{ |
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return implode(';', $values); |
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} |
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} |
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lamoda /
php-metrics
