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<?php
namespace ACP\API;
use AC\Transient;
use ACP\RequestDispatcher;
class Cached implements RequestDispatcher {
const EXPIRATION = 'expiration';
const FORCE_UPDATE = 'force_update';
/**
* @var RequestDispatcher
*/
private $api;
public function __construct( RequestDispatcher $api ) {
$this->api = $api;
}
/**
* @param Request $request
*
* @return Transient
*/
protected function get_cache( Request $request ) {
$key = md5( serialize( $request->get_body() ) );
return new Transient( 'ac_api_request_' . $key );
}
/**
* @param Transient $cache
*
* @return Response|null
*/
protected function get_cached_response( Transient $cache ) {
$value = $cache->get();
$response = is_string( $value )
? unserialize( $value )
: null;
return $response instanceof Response
? $response
: null;
}
public function dispatch( Request $request, array $args = [] ) {
$args = array_merge( [
self::EXPIRATION => HOUR_IN_SECONDS,
self::FORCE_UPDATE => false,
], $args );
$cache = $this->get_cache( $request );
$response = $this->get_cached_response( $cache );
if ( $args[ self::FORCE_UPDATE ] || $cache->is_expired() || null === $response ) {
$response = $this->api->dispatch( $request );
$cache->save( serialize( $response ), (int) $args[ self::EXPIRATION ] );
}
return $response;
}
}
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