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<?php
declare(strict_types=1);
namespace OpenTelemetry\Context\Propagation;
use function array_map;
use function array_merge;
use function array_unique;
use function array_values;
use OpenTelemetry\Context\Context;
use OpenTelemetry\Context\ContextInterface;
final class MultiTextMapPropagator implements TextMapPropagatorInterface
{
/**
* @readonly
*
* @var list<TextMapPropagatorInterface>
*/
private array $propagators = [];
/**
* @readonly
*
* @var list<string>
*/
private array $fields;
/**
* @no-named-arguments
*
* @param list<TextMapPropagatorInterface> $propagators
*/
public function __construct(array $propagators)
{
$this->propagators = $propagators;
$this->fields = $this->extractFields($propagators);
}
public function fields(): array
{
return $this->fields;
}
public function inject(&$carrier, PropagationSetterInterface $setter = null, ContextInterface $context = null): void
{
foreach ($this->propagators as $propagator) {
$propagator->inject($carrier, $setter, $context);
}
}
public function extract($carrier, PropagationGetterInterface $getter = null, ContextInterface $context = null): ContextInterface
{
$context ??= Context::getCurrent();
foreach ($this->propagators as $propagator) {
$context = $propagator->extract($carrier, $getter, $context);
}
return $context;
}
/**
* @param list<TextMapPropagatorInterface> $propagators
* @return list<string>
*/
private function extractFields(array $propagators): array
{
return array_values(
array_unique(
// Phan seems to struggle here with the variadic argument
// @phan-suppress-next-line PhanParamTooFewInternalUnpack
array_merge(
...array_map(
static fn (TextMapPropagatorInterface $propagator) => $propagator->fields(),
$propagators
)
)
)
);
}
}
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