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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\MetricReader;
use function array_keys;
use OpenTelemetry\SDK\Metrics\AggregationInterface;
use OpenTelemetry\SDK\Metrics\AggregationTemporalitySelectorInterface;
use OpenTelemetry\SDK\Metrics\DefaultAggregationProviderInterface;
use OpenTelemetry\SDK\Metrics\DefaultAggregationProviderTrait;
use OpenTelemetry\SDK\Metrics\MetricExporterInterface;
use OpenTelemetry\SDK\Metrics\MetricFactory\StreamMetricSourceProvider;
use OpenTelemetry\SDK\Metrics\MetricMetadataInterface;
use OpenTelemetry\SDK\Metrics\MetricReaderInterface;
use OpenTelemetry\SDK\Metrics\MetricRegistry\MetricCollectorInterface;
use OpenTelemetry\SDK\Metrics\MetricSourceInterface;
use OpenTelemetry\SDK\Metrics\MetricSourceProviderInterface;
use OpenTelemetry\SDK\Metrics\MetricSourceRegistryInterface;
use OpenTelemetry\SDK\Metrics\PushMetricExporterInterface;
use OpenTelemetry\SDK\Metrics\StalenessHandlerInterface;
use function spl_object_id;
final class ExportingReader implements MetricReaderInterface, MetricSourceRegistryInterface, DefaultAggregationProviderInterface
{
use DefaultAggregationProviderTrait { defaultAggregation as private _defaultAggregation; }
private MetricExporterInterface $exporter;
/** @var array<int, MetricSourceInterface> */
private array $sources = [];
/** @var array<int, MetricCollectorInterface> */
private array $registries = [];
/** @var array<int, array<int, int>> */
private array $streamIds = [];
private bool $closed = false;
public function __construct(MetricExporterInterface $exporter)
{
$this->exporter = $exporter;
}
public function defaultAggregation($instrumentType): ?AggregationInterface
{
if ($this->exporter instanceof DefaultAggregationProviderInterface) {
return $this->exporter->defaultAggregation($instrumentType);
}
return $this->_defaultAggregation($instrumentType);
}
public function add(MetricSourceProviderInterface $provider, MetricMetadataInterface $metadata, StalenessHandlerInterface $stalenessHandler): void
{
if ($this->closed) {
return;
}
if (!$this->exporter instanceof AggregationTemporalitySelectorInterface) {
return;
}
if (!$temporality = $this->exporter->temporality($metadata)) {
return;
}
$source = $provider->create($temporality);
$sourceId = spl_object_id($source);
$this->sources[$sourceId] = $source;
$stalenessHandler->onStale(function () use ($sourceId): void {
unset($this->sources[$sourceId]);
});
if (!$provider instanceof StreamMetricSourceProvider) {
return;
}
$streamId = $provider->streamId;
$registry = $provider->metricCollector;
$registryId = spl_object_id($registry);
$this->registries[$registryId] = $registry;
$this->streamIds[$registryId][$streamId] ??= 0;
$this->streamIds[$registryId][$streamId]++;
$stalenessHandler->onStale(function () use ($streamId, $registryId): void {
if (!--$this->streamIds[$registryId][$streamId]) {
unset($this->streamIds[$registryId][$streamId]);
if (!$this->streamIds[$registryId]) {
unset(
$this->registries[$registryId],
$this->streamIds[$registryId],
);
}
}
});
}
private function doCollect(): bool
{
foreach ($this->registries as $registryId => $registry) {
$streamIds = $this->streamIds[$registryId] ?? [];
$registry->collectAndPush(array_keys($streamIds));
}
$metrics = [];
foreach ($this->sources as $source) {
$metrics[] = $source->collect();
}
if ($metrics === []) {
return true;
}
return $this->exporter->export($metrics);
}
public function collect(): bool
{
if ($this->closed) {
return false;
}
return $this->doCollect();
}
public function shutdown(): bool
{
if ($this->closed) {
return false;
}
$this->closed = true;
$collect = $this->doCollect();
$shutdown = $this->exporter->shutdown();
$this->sources = [];
return $collect && $shutdown;
}
public function forceFlush(): bool
{
if ($this->closed) {
return false;
}
if ($this->exporter instanceof PushMetricExporterInterface) {
$collect = $this->doCollect();
$forceFlush = $this->exporter->forceFlush();
return $collect && $forceFlush;
}
return true;
}
}
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