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NoopTracer.php
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NoopTracer.php
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<?php
namespace Wikimedia\Telemetry;
/**
* A no-op tracer that creates no-op spans and persists no data.
* Useful for scenarios where tracing is disabled.
* Can still propagate some (not-Span-specific) context, like X-Request-Id.
*
* @since 1.43
* @internal
*/
class NoopTracer implements TracerInterface {
private SpanContext $noopSpanContext;
private TracerState $tracerState;
private ?ContextPropagatorInterface $contextPropagator;
public function __construct( ?ContextPropagatorInterface $contextPropagator = null ) {
$this->noopSpanContext = new SpanContext( '', '', null, '', false );
$this->tracerState = new TracerState();
$this->contextPropagator = $contextPropagator;
}
/** @inheritDoc */
public function createSpan( string $spanName, $parentSpan = null ): SpanInterface {
return new NoopSpan( $this->tracerState, $this->noopSpanContext );
}
/** @inheritDoc */
public function createRootSpan( string $spanName ): SpanInterface {
return new NoopSpan( $this->tracerState, $this->noopSpanContext );
}
/** @inheritDoc */
public function createSpanWithParent( string $spanName, SpanContext $parentSpanContext ): SpanInterface {
return new NoopSpan( $this->tracerState, $this->noopSpanContext );
}
/** @inheritDoc */
public function shutdown(): void {
// no-op
}
/** @inheritDoc */
public function createRootSpanFromCarrier( string $spanName, array $carrier ): SpanInterface {
return new NoopSpan( $this->tracerState, $this->noopSpanContext );
}
/** @inheritDoc */
public function getRequestHeaders(): array {
$rv = [];
if ( $this->contextPropagator ) {
$rv = $this->contextPropagator->inject( $this->noopSpanContext, $rv );
}
return $rv;
}
}

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Wed, Aug 19, 01:51 (2 w, 2 d ago)
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NoopTracer.php (1 KB)

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