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<?php |
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namespace Krenor\Prometheus\Contracts; |
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use Closure; |
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use Krenor\Prometheus\Sample; |
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use Tightenco\Collect\Support\Collection; |
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abstract class SamplesBuilder |
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{ |
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/** |
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* @var Metric |
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*/ |
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protected $metric; |
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/** |
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* @var Collection |
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*/ |
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protected $items; |
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/** |
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* SamplesCollector constructor. |
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* |
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* @param Metric $metric |
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* @param Collection $items |
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*/ |
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public function __construct(Metric $metric, Collection $items) |
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{ |
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$this->metric = $metric; |
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$this->items = $items; |
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} |
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/** |
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* @return Collection |
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*/ |
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public function samples(): Collection |
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{ |
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return $this->group()->flatMap(function (Collection $group) { |
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return $group->map($this->build($this->metric->key())); |
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}); |
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} |
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/** |
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* @return mixed |
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*/ |
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abstract protected function initialize(); |
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/** |
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* @return Collection |
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*/ |
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protected function group(): Collection |
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{ |
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if ($this->metric->labels()->isEmpty() && $this->items->isEmpty()) { |
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return new Collection([ |
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new Collection([ |
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['value' => $this->initialize()], |
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]), |
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]); |
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} |
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$labels = $this->metric->labels()->toArray(); |
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return $this->items |
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->map(function ($value, string $key) { |
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return json_decode($key, true) + compact('value'); |
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})->reject(function (array $data) use ($labels) { |
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return !array_key_exists('labels', $data) |
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?: array_keys($data['labels']) !== $labels; |
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})->mapToGroups(function (array $item) { |
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return [ |
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json_encode($item['labels']) => $item, |
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]; |
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})->sortKeys(); |
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} |
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/** |
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* @param string $name |
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* |
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* @return Closure |
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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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$value = $item['value']; |
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$labels = new Collection($item['labels']); |
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return new Sample($name, $value, $labels); |
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}; |
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} |
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} |
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krenor /
prometheus-client
