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| 1 | <?php |
| 2 | namespace Wikimedia\Telemetry; |
| 3 | |
| 4 | /** |
| 5 | * A no-op tracer that creates no-op spans and persists no data. |
| 6 | * Useful for scenarios where tracing is disabled. |
| 7 | * Can still propagate some (not-Span-specific) context, like X-Request-Id. |
| 8 | * |
| 9 | * @since 1.43 |
| 10 | * @internal |
| 11 | */ |
| 12 | class NoopTracer implements TracerInterface { |
| 13 | |
| 14 | private SpanContext $noopSpanContext; |
| 15 | private TracerState $tracerState; |
| 16 | private ?ContextPropagatorInterface $contextPropagator; |
| 17 | |
| 18 | public function __construct( ?ContextPropagatorInterface $contextPropagator = null ) { |
| 19 | $this->noopSpanContext = new SpanContext( '', '', null, '', false ); |
| 20 | $this->tracerState = new TracerState(); |
| 21 | $this->contextPropagator = $contextPropagator; |
| 22 | } |
| 23 | |
| 24 | /** @inheritDoc */ |
| 25 | public function createSpan( string $spanName, $parentSpan = null ): SpanInterface { |
| 26 | return new NoopSpan( $this->tracerState, $this->noopSpanContext ); |
| 27 | } |
| 28 | |
| 29 | /** @inheritDoc */ |
| 30 | public function createRootSpan( string $spanName ): SpanInterface { |
| 31 | return new NoopSpan( $this->tracerState, $this->noopSpanContext ); |
| 32 | } |
| 33 | |
| 34 | /** @inheritDoc */ |
| 35 | public function createSpanWithParent( string $spanName, SpanContext $parentSpanContext ): SpanInterface { |
| 36 | return new NoopSpan( $this->tracerState, $this->noopSpanContext ); |
| 37 | } |
| 38 | |
| 39 | /** @inheritDoc */ |
| 40 | public function shutdown(): void { |
| 41 | // no-op |
| 42 | } |
| 43 | |
| 44 | /** @inheritDoc */ |
| 45 | public function createRootSpanFromCarrier( string $spanName, array $carrier ): SpanInterface { |
| 46 | return new NoopSpan( $this->tracerState, $this->noopSpanContext ); |
| 47 | } |
| 48 | |
| 49 | /** @inheritDoc */ |
| 50 | public function getRequestHeaders(): array { |
| 51 | $rv = []; |
| 52 | if ( $this->contextPropagator ) { |
| 53 | $rv = $this->contextPropagator->inject( $this->noopSpanContext, $rv ); |
| 54 | } |
| 55 | return $rv; |
| 56 | } |
| 57 | } |