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<?php
declare(strict_types=1);
namespace OpenTracing\Mock;
use OpenTracing\InvalidReferenceArgumentException;
use OpenTracing\UnsupportedFormatException;
use OpenTracing\Scope;
use OpenTracing\ScopeManager;
use OpenTracing\Span;
use OpenTracing\SpanContext;
use OpenTracing\StartSpanOptions;
use OpenTracing\Tracer;
final class MockTracer implements Tracer
{
/**
* @var array|MockSpan[]
*/
private $spans = [];
/**
* @var array|callable[]
*/
private $injectors;
/**
* @var array|callable[]
*/
private $extractors;
/**
* @var ScopeManager
*/
private $scopeManager;
public function __construct(array $injectors = [], array $extractors = [])
{
$this->injectors = $injectors;
$this->extractors = $extractors;
$this->scopeManager = new MockScopeManager();
}
/**
* {@inheritdoc}
*/
public function startActiveSpan(string $operationName, $options = []): Scope
{
if (!($options instanceof StartSpanOptions)) {
$options = StartSpanOptions::create($options);
}
if (($activeSpan = $this->getActiveSpan()) !== null) {
$options = $options->withParent($activeSpan);
}
$span = $this->startSpan($operationName, $options);
return $this->scopeManager->activate($span, $options->shouldFinishSpanOnClose());
}
/**
* {@inheritdoc}
*/
public function startSpan(string $operationName, $options = []): Span
{
if (!($options instanceof StartSpanOptions)) {
$options = StartSpanOptions::create($options);
}
if (empty($options->getReferences())) {
$spanContext = MockSpanContext::createAsRoot();
} else {
$referenceContext = $options->getReferences()[0]->getSpanContext();
if (!$referenceContext instanceof MockSpanContext) {
throw InvalidReferenceArgumentException::forInvalidContext($referenceContext);
}
$spanContext = MockSpanContext::createAsChildOf($referenceContext);
}
$span = new MockSpan($operationName, $spanContext, $options->getStartTime());
foreach ($options->getTags() as $key => $value) {
$span->setTag($key, $value);
}
$this->spans[] = $span;
return $span;
}
/**
* {@inheritdoc}
*/
public function inject(SpanContext $spanContext, string $format, &$carrier): void
{
if (!array_key_exists($format, $this->injectors)) {
throw UnsupportedFormatException::forFormat($format);
}
$this->injectors[$format]($spanContext, $carrier);
}
/**
* {@inheritdoc}
*/
public function extract(string $format, $carrier): ?SpanContext
{
if (!array_key_exists($format, $this->extractors)) {
throw UnsupportedFormatException::forFormat($format);
}
return $this->extractors[$format]($carrier);
}
/**
* {@inheritdoc}
*/
public function flush(): void
{
$this->spans = [];
}
/**
* @return array|MockSpan[]
*/
public function getSpans(): array
{
return $this->spans;
}
/**
* {@inheritdoc}
*/
public function getScopeManager(): ScopeManager
{
return $this->scopeManager;
}
/**
* {@inheritdoc}
*/
public function getActiveSpan(): ?Span
{
if (null !== ($activeScope = $this->scopeManager->getActive())) {
return $activeScope->getSpan();
}
return null;
}
}
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