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<?php
/** @noinspection PhpUndefinedMethodInspection */
/** @phan-file-suppress PhanUndeclaredClassCatch */
/** @phan-file-suppress PhanUndeclaredClassMethod */
/** @phan-file-suppress PhanUndeclaredMethod */
declare(strict_types=1);
namespace OpenTelemetry\Context;
use function extension_loaded;
use FFI;
use const FILTER_VALIDATE_BOOLEAN;
use function filter_var;
use function is_string;
use const PHP_VERSION_ID;
use const PHP_ZTS;
use function sprintf;
use function trigger_error;
/**
* @internal
*/
final class ZendObserverFiber
{
public static function isEnabled(): bool
{
$enabled = $_SERVER['OTEL_PHP_FIBERS_ENABLED'] ?? false;
return is_string($enabled)
? filter_var($enabled, FILTER_VALIDATE_BOOLEAN)
: (bool) $enabled;
}
public static function init(): bool
{
static $fibers;
if ($fibers) {
return true;
}
if (PHP_ZTS || PHP_VERSION_ID < 80100 || !extension_loaded('ffi')) {
trigger_error('Context: Fiber context switching not supported, requires PHP >= 8.1, an NTS build, and the FFI extension');
return false;
}
try {
$fibers = FFI::scope('OTEL_ZEND_OBSERVER_FIBER');
} catch (FFI\Exception $e) {
try {
$fibers = FFI::load(__DIR__ . '/fiber/zend_observer_fiber.h');
} catch (FFI\Exception $e) {
trigger_error(sprintf('Context: Fiber context switching not supported, %s', $e->getMessage()));
return false;
}
}
$fibers->zend_observer_fiber_init_register(static fn (int $initializing) => Context::storage()->fork($initializing)); //@phpstan-ignore-line
$fibers->zend_observer_fiber_switch_register(static fn (int $from, int $to) => Context::storage()->switch($to)); //@phpstan-ignore-line
$fibers->zend_observer_fiber_destroy_register(static fn (int $destroying) => Context::storage()->destroy($destroying)); //@phpstan-ignore-line
return true;
}
}
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