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<?php
declare(strict_types=1);
namespace Http\Client\Common;
use function array_reverse;
use Http\Client\Common\Exception\LoopException;
use Http\Promise\Promise;
use Psr\Http\Message\RequestInterface;
final class PluginChain
{
/** @var Plugin[] */
private $plugins;
/** @var callable(RequestInterface): Promise */
private $clientCallable;
/** @var int */
private $maxRestarts;
/** @var int */
private $restarts = 0;
/**
* @param Plugin[] $plugins A plugin chain
* @param callable(RequestInterface): Promise $clientCallable Callable making the HTTP call
* @param array $options {
*
* @var int $max_restarts
* }
*/
public function __construct(array $plugins, callable $clientCallable, array $options = [])
{
$this->plugins = $plugins;
$this->clientCallable = $clientCallable;
$this->maxRestarts = (int) ($options['max_restarts'] ?? 0);
}
private function createChain(): callable
{
$lastCallable = $this->clientCallable;
$reversedPlugins = array_reverse($this->plugins);
foreach ($reversedPlugins as $plugin) {
$lastCallable = function (RequestInterface $request) use ($plugin, $lastCallable) {
return $plugin->handleRequest($request, $lastCallable, $this);
};
}
return $lastCallable;
}
public function __invoke(RequestInterface $request): Promise
{
if ($this->restarts > $this->maxRestarts) {
throw new LoopException('Too many restarts in plugin client', $request);
}
++$this->restarts;
return $this->createChain()($request);
}
}