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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\Sample; |
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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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* @var Summary |
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*/ |
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protected $metric; |
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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, $items); |
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} |
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/** |
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* @return Collection |
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*/ |
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protected function initialize(): Collection |
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{ |
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return new Collection; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function group(): Collection |
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{ |
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return parent::group()->collapse()->map(function ($item) { |
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/** @var Collection $values */ |
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$values = $item['value']; |
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$count = $values->count(); |
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$labels = $item['labels']; |
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return $this->metric |
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->quantiles() |
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->map($this->calculate($values->sort()->values(), $count)) |
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->push(compact('count')) |
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->push(['sum' => $values->sum()]) |
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->map(function ($item) use ($labels) { |
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$item['labels'] = $labels; |
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return $item; |
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}); |
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}); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function build(string $name): Closure |
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{ |
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return function (array $item) use ($name) { |
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$labels = new Collection($item['labels']); |
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if (array_key_exists('count', $item)) { |
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return new Sample("{$name}_count", $item['count'], $labels); |
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} |
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if (array_key_exists('sum', $item)) { |
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return new Sample("{$name}_sum", $item['sum'], $labels); |
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} |
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return new Sample("{$name}", $item['value'], $labels->put('quantile', $item['quantile'])); |
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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
