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<?php
namespace React\Http\Io;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use React\Promise\PromiseInterface;
/**
* [Internal] Middleware runner to expose an array of middleware request handlers as a single request handler callable
*
* @internal
*/
final class MiddlewareRunner
{
/**
* @var callable[]
*/
private $middleware;
/**
* @param callable[] $middleware
*/
public function __construct(array $middleware)
{
$this->middleware = \array_values($middleware);
}
/**
* @param ServerRequestInterface $request
* @return ResponseInterface|PromiseInterface<ResponseInterface>
* @throws \Exception
*/
public function __invoke(ServerRequestInterface $request)
{
if (empty($this->middleware)) {
throw new \RuntimeException('No middleware to run');
}
return $this->call($request, 0);
}
/** @internal */
public function call(ServerRequestInterface $request, $position)
{
// final request handler will be invoked without a next handler
if (!isset($this->middleware[$position + 1])) {
$handler = $this->middleware[$position];
return $handler($request);
}
$that = $this;
$next = function (ServerRequestInterface $request) use ($that, $position) {
return $that->call($request, $position + 1);
};
// invoke middleware request handler with next handler
$handler = $this->middleware[$position];
return $handler($request, $next);
}
}
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