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<?php
declare(strict_types=1);
namespace OpenTelemetry\Context;
use function assert;
use function spl_object_id;
/**
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/context/README.md#context
*/
final class Context implements ContextInterface
{
/** @var ContextStorageInterface&ExecutionContextAwareInterface */
private static ContextStorageInterface $storage;
// Optimization for spans to avoid copying the context array.
private static ContextKeyInterface $spanContextKey;
private ?object $span = null;
/** @var array<int, mixed> */
private array $context = [];
/** @var array<int, ContextKeyInterface> */
private array $contextKeys = [];
private function __construct()
{
self::$spanContextKey = ContextKeys::span();
}
public static function createKey(string $key): ContextKeyInterface
{
return new ContextKey($key);
}
/**
* @param ContextStorageInterface&ExecutionContextAwareInterface $storage
*/
public static function setStorage(ContextStorageInterface $storage): void
{
self::$storage = $storage;
}
/**
* @return ContextStorageInterface&ExecutionContextAwareInterface
*/
public static function storage(): ContextStorageInterface
{
/** @psalm-suppress RedundantPropertyInitializationCheck */
return self::$storage ??= new ContextStorage();
}
/**
* @param ContextInterface|false|null $context
*
* @internal OpenTelemetry
*/
public static function resolve($context, ?ContextStorageInterface $contextStorage = null): ContextInterface
{
return $context
?? ($contextStorage ?? self::storage())->current()
?: self::getRoot();
}
/**
* @internal
*/
public static function getRoot(): ContextInterface
{
static $empty;
return $empty ??= new self();
}
public static function getCurrent(): ContextInterface
{
return self::storage()->current();
}
public function activate(): ScopeInterface
{
$scope = self::storage()->attach($this);
/** @psalm-suppress RedundantCondition */
assert((bool) $scope = new DebugScope($scope));
return $scope;
}
public function withContextValue(ImplicitContextKeyedInterface $value): ContextInterface
{
return $value->storeInContext($this);
}
public function with(ContextKeyInterface $key, $value): self
{
if ($this->get($key) === $value) {
return $this;
}
$self = clone $this;
if ($key === self::$spanContextKey) {
$self->span = $value; // @phan-suppress-current-line PhanTypeMismatchPropertyReal
return $self;
}
$id = spl_object_id($key);
if ($value !== null) {
$self->context[$id] = $value;
$self->contextKeys[$id] ??= $key;
} else {
unset(
$self->context[$id],
$self->contextKeys[$id],
);
}
return $self;
}
public function get(ContextKeyInterface $key)
{
if ($key === self::$spanContextKey) {
/** @psalm-suppress InvalidReturnStatement */
return $this->span;
}
return $this->context[spl_object_id($key)] ?? null;
}
}
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