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<?php
namespace React\Dns\Query;
use React\Promise\Promise;
final class FallbackExecutor implements ExecutorInterface
{
private $executor;
private $fallback;
public function __construct(ExecutorInterface $executor, ExecutorInterface $fallback)
{
$this->executor = $executor;
$this->fallback = $fallback;
}
public function query(Query $query)
{
$cancelled = false;
$fallback = $this->fallback;
$promise = $this->executor->query($query);
return new Promise(function ($resolve, $reject) use (&$promise, $fallback, $query, &$cancelled) {
$promise->then($resolve, function (\Exception $e1) use ($fallback, $query, $resolve, $reject, &$cancelled, &$promise) {
// reject if primary resolution rejected due to cancellation
if ($cancelled) {
$reject($e1);
return;
}
// start fallback query if primary query rejected
$promise = $fallback->query($query)->then($resolve, function (\Exception $e2) use ($e1, $reject) {
$append = $e2->getMessage();
if (($pos = strpos($append, ':')) !== false) {
$append = substr($append, $pos + 2);
}
// reject with combined error message if both queries fail
$reject(new \RuntimeException($e1->getMessage() . '. ' . $append));
});
});
}, function () use (&$promise, &$cancelled) {
// cancel pending query (primary or fallback)
$cancelled = true;
$promise->cancel();
});
}
}