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<?php |
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namespace Krenor\Prometheus\Storage\Builders; |
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use Closure; |
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use Krenor\Prometheus\Metrics\Summary; |
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use Tightenco\Collect\Support\Collection; |
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use Krenor\Prometheus\Contracts\SamplesBuilder; |
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class SummarySamplesBuilder extends SamplesBuilder |
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{ |
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/** |
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* SummarySamplesBuilder constructor. |
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* |
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* @param Summary $summary |
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* @param Collection $items |
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*/ |
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public function __construct(Summary $summary, Collection $items) |
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{ |
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parent::__construct($summary, $items); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function parse(): Collection |
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{ |
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$quantiles = $this->metric->quantiles(); |
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return parent |
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::parse() |
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->flatMap(function (array $item) use ($quantiles) { |
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['name' => $name, |
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'labels' => $labels] = $item; |
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$values = !$item['value'] instanceof Collection |
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? new Collection |
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: $item['value']; |
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$count = $values->count(); |
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return $quantiles |
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->map($this->calculate($values->sort()->values(), $count)) |
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->map(function (array $item) use ($name, $labels) { |
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$item['labels'] = $labels + [ |
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'quantile' => $item['quantile'], |
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]; |
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return $item + compact('name'); |
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})->push([ |
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'name' => "{$name}_count", |
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'value' => $count, |
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'labels' => $labels, |
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])->push([ |
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'name' => "{$name}_sum", |
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'value' => $values->sum(), |
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'labels' => $labels, |
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]); |
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}); |
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} |
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/** |
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* @param Collection $values |
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* @param int $count |
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* |
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* @return Closure |
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*/ |
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private function calculate(Collection $values, int $count): Closure |
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{ |
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return function (float $quantile) use ($count, $values) { |
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$position = $count * $quantile; |
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$index = (int) $position; |
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$value = floor($position) === $position |
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? ($values->get($index - 1) + $values->get($index)) / 2 |
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: $values->get($index); |
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return compact('quantile', 'value'); |
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}; |
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} |
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} |
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krenor /
prometheus-client
