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<?php |
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namespace Krenor\Prometheus\Storage\Builders; |
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use InvalidArgumentException; |
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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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* 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, $items); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function parse(): Collection |
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{ |
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$name = $this->metric->key(); |
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$buckets = $this->metric->buckets()->push('+Inf'); |
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return parent |
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::parse() |
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->groupBy(fn($data) => json_encode($data['labels'])) |
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->flatMap(function (Collection $data) use ($name, $buckets) { |
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$labels = $data->first()['labels']; |
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/** @var $sum Collection */ |
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/** @var $observations Collection */ |
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[$sum, $observations] = $data->partition('bucket', null); |
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if ($sum->count() !== 1) { |
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throw new InvalidArgumentException('Sum of bucket observations missing.'); |
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} |
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return $this |
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->pad($this->complete($buckets, $observations), new Collection) |
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->map(function (array $items) use ($name, $labels) { |
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$items['name'] = "{$name}_bucket"; |
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$items['labels'] = $labels + [ |
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'le' => $items['bucket'], |
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]; |
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return $items; |
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})->push([ |
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'name' => "{$name}_count", |
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'value' => $observations->sum('value'), |
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'labels' => $labels, |
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])->push([ |
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'name' => "{$name}_sum", |
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'value' => $sum->first()['value'], |
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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 $buckets |
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* @param Collection $observations |
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* |
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* @return Collection |
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*/ |
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private function complete(Collection $buckets, Collection $observations): Collection |
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{ |
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$missing = $buckets |
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->diff($observations->pluck('bucket')) |
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->map(fn($bucket) => compact('bucket') + ['value' => 0]); |
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return $observations |
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->reject(fn(array $observation) => !$buckets->contains($observation['bucket']))->merge($missing) |
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->sort(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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})->values(); |
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} |
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/** |
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* @param Collection $data |
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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 pad(Collection $data, Collection $result, int $sum = 0, int $i = 0): Collection |
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{ |
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if ($i >= $data->count()) { |
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return $result; |
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} |
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$value = $data[$i]['value'] + $sum; |
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$bucket = $data[$i]['bucket']; |
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$result->push(compact('bucket', 'value')); |
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return $this->pad($data, $result, $value, ++$i); |
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} |
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} |
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krenor /
prometheus-client
