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