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<?php declare(strict_types=1); namespace Sentry\Tracing; final class TransactionContext extends SpanContext { private const SENTRY_TRACEPARENT_HEADER_REGEX = '/^[ \\t]*(?<trace_id>[0-9a-f]{32})?-?(?<span_id>[0-9a-f]{16})?-?(?<sampled>[01])?[ \\t]*$/i'; private const W3C_TRACEPARENT_HEADER_REGEX = '/^[ \\t]*(?<version>[0]{2})?-?(?<trace_id>[0-9a-f]{32})?-?(?<span_id>[0-9a-f]{16})?-?(?<sampled>[01]{2})?[ \\t]*$/i'; public const DEFAULT_NAME = '<unlabeled transaction>'; /** * @var string Name of the transaction */ private $name; /** * @var bool|null The parent's sampling decision */ private $parentSampled; /** * @var TransactionMetadata The transaction metadata */ private $metadata; /** * Constructor. * * @param string $name The name of the transaction * @param bool|null $parentSampled The parent's sampling decision * @param TransactionMetadata|null $metadata The transaction metadata */ public function __construct( string $name = self::DEFAULT_NAME, ?bool $parentSampled = null, ?TransactionMetadata $metadata = null ) { $this->name = $name; $this->parentSampled = $parentSampled; $this->metadata = $metadata ?? new TransactionMetadata(); } /** * @return self */ public static function make() { return new self(); } /** * Gets the name of the transaction. */ public function getName(): string { return $this->name; } /** * Sets the name of the transaction. * * @param string $name The name */ public function setName(string $name): self { $this->name = $name; return $this; } /** * Gets the parent's sampling decision. */ public function getParentSampled(): ?bool { return $this->parentSampled; } /** * Sets the parent's sampling decision. * * @param bool|null $parentSampled The decision */ public function setParentSampled(?bool $parentSampled): self { $this->parentSampled = $parentSampled; return $this; } /** * Gets the transaction metadata. */ public function getMetadata(): TransactionMetadata { return $this->metadata; } /** * Sets the transaction metadata. * * @param TransactionMetadata $metadata The transaction metadata */ public function setMetadata(TransactionMetadata $metadata): self { $this->metadata = $metadata; return $this; } /** * Sets the transaction source. * * @param TransactionSource $transactionSource The transaction source */ public function setSource(TransactionSource $transactionSource): self { $this->metadata->setSource($transactionSource); return $this; } /** * Returns a context populated with the data of the given environment variables. * * @param string $sentryTrace The sentry-trace value from the environment * @param string $baggage The baggage header value from the environment */ public static function fromEnvironment(string $sentryTrace, string $baggage): self { return self::parseTraceAndBaggage($sentryTrace, $baggage); } /** * Returns a context populated with the data of the given headers. * * @param string $sentryTraceHeader The sentry-trace header from an incoming request * @param string $baggageHeader The baggage header from an incoming request */ public static function fromHeaders(string $sentryTraceHeader, string $baggageHeader): self { return self::parseTraceAndBaggage($sentryTraceHeader, $baggageHeader); } private static function parseTraceAndBaggage(string $sentryTrace, string $baggage): self { $context = new self(); $hasSentryTrace = false; if (preg_match(self::SENTRY_TRACEPARENT_HEADER_REGEX, $sentryTrace, $matches)) { if (!empty($matches['trace_id'])) { $context->traceId = new TraceId($matches['trace_id']); $hasSentryTrace = true; } if (!empty($matches['span_id'])) { $context->parentSpanId = new SpanId($matches['span_id']); $hasSentryTrace = true; } if (isset($matches['sampled'])) { $context->parentSampled = $matches['sampled'] === '1'; $hasSentryTrace = true; } } elseif (preg_match(self::W3C_TRACEPARENT_HEADER_REGEX, $sentryTrace, $matches)) { if (!empty($matches['trace_id'])) { $context->traceId = new TraceId($matches['trace_id']); $hasSentryTrace = true; } if (!empty($matches['span_id'])) { $context->parentSpanId = new SpanId($matches['span_id']); $hasSentryTrace = true; } if (isset($matches['sampled'])) { $context->parentSampled = $matches['sampled'] === '01'; $hasSentryTrace = true; } } $samplingContext = DynamicSamplingContext::fromHeader($baggage); if ($hasSentryTrace && !$samplingContext->hasEntries()) { // The request comes from an old SDK which does not support Dynamic Sampling. // Propagate the Dynamic Sampling Context as is, but frozen, even without sentry-* entries. $samplingContext->freeze(); $context->getMetadata()->setDynamicSamplingContext($samplingContext); } if ($hasSentryTrace && $samplingContext->hasEntries()) { // The baggage header contains Dynamic Sampling Context data from an upstream SDK. // Propagate this Dynamic Sampling Context. $context->getMetadata()->setDynamicSamplingContext($samplingContext); } return $context; } }
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