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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 InvalidArgumentException; |
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use Krenor\Prometheus\Sample; |
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use Krenor\Prometheus\Metrics\Histogram; |
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use Tightenco\Collect\Support\Collection; |
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use Krenor\Prometheus\Contracts\SamplesBuilder; |
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class HistogramSamplesBuilder extends SamplesBuilder |
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{ |
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/** |
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* @var Histogram |
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*/ |
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protected $metric; |
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/** |
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* HistogramSamplesBuilder constructor. |
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* |
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* @param Histogram $histogram |
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* @param Collection $items |
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*/ |
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public function __construct(Histogram $histogram, Collection $items) |
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{ |
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parent::__construct($histogram, $items); |
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} |
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/** |
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* @return int |
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*/ |
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protected function initialize(): int |
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{ |
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return 0; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function group(): Collection |
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{ |
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$buckets = $this->metric->buckets()->push('+Inf'); |
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return parent::group()->map(function (Collection $items) use ($buckets) { |
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$sum = $items->pop(); |
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if (array_key_exists('bucket', $sum)) { |
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throw new InvalidArgumentException('The last element has to be the sum of all bucket observations.'); |
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} |
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$labels = $items->first()['labels']; |
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return $this |
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->fill($this->all($buckets, $items), new Collection) |
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->push(['count' => $items->sum('value')]) |
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->push(['sum' => $sum['value']]) |
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->map(function ($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}_bucket", $item['value'], $labels->put('le', $item['bucket'])); |
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}; |
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} |
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/** |
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* @param Collection $buckets |
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* @param Collection $items |
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* |
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* @return Collection |
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*/ |
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private function all(Collection $buckets, Collection $items): Collection |
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{ |
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$missing = $buckets |
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->diff($items->pluck('bucket')) |
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->map(function ($bucket) { |
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return compact('bucket') + ['value' => 0]; |
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}); |
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return $items |
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->reject(function (array $item) use ($buckets) { |
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return !$buckets->contains($item['bucket']); |
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})->merge($missing) |
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->sort($this->sort()) |
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->values(); |
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} |
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/** |
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* @return Closure |
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*/ |
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private function sort(): Closure |
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{ |
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return function (array $left, array $right) { |
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// Due to http://php.net/manual/en/language.types.string.php#language.types.string.conversion the |
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// bucket containing "+Inf" will be cast to 0. Sorting regularly would end up with it incorrectly |
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// sitting at the very first spot instead of where it belongs - at the end. |
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if ($left['bucket'] === '+Inf') { |
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return 1; |
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} |
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if ($right['bucket'] === '+Inf') { |
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return -1; |
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} |
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return $left['bucket'] <=> $right['bucket']; |
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}; |
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} |
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/** |
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* @param Collection $items |
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* @param Collection $result |
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* @param int $sum |
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* @param int $i |
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* |
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* @return Collection |
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*/ |
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private function fill(Collection $items, Collection $result, int $sum = 0, int $i = 0): Collection |
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{ |
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if ($i >= $items->count()) { |
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return $result; |
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} |
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$value = $items[$i]['value'] + $sum; |
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$bucket = $items[$i]['bucket']; |
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$result->push(compact('bucket', 'value')); |
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return $this->fill($items, $result, $value, ++$i); |
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} |
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} |
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krenor /
prometheus-client
