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<?php |
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/** |
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* Layers handler |
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* User: moyo |
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* Date: 06/08/2017 |
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* Time: 6:33 PM |
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*/ |
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namespace Carno\Chain; |
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use Carno\Chain\Chips\Extensions; |
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use Carno\Coroutine\Context; |
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use Carno\Promise\Promise; |
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use Carno\Promise\Promised; |
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use Closure; |
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use Throwable; |
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final class Layers |
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{ |
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use Extensions; |
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/** |
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* processed layer idx |
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*/ |
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private const XID = 'chain-lax-id'; |
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/** |
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* @var Layered[] |
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*/ |
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private $layers = []; |
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/** |
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* Layers constructor. |
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* @param Layered ...$layers |
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*/ |
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public function __construct(Layered ...$layers) |
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{ |
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$this->layers = $layers; |
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} |
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/** |
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* @param Context $ctx |
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* @param mixed $initial |
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* @return Promised |
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*/ |
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private function processing(Context $ctx, $initial) : Promised |
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{ |
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$seed = $chain = Promise::deferred(); |
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foreach ($this->layers as $idx => $layer) { |
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$chain = $chain->then(static function ($data) use ($ctx, $layer, $idx) { |
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return $layer->inbound($data, $ctx->set(self::XID, $idx)); |
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}, static function (Throwable $e) use ($ctx, $layer, $idx) { |
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if (($ctx->get(self::XID) ?? 999) >= $idx) { |
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$layer->exception($e, $ctx); |
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} else { |
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throw $e; |
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} |
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}); |
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} |
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$size = count($this->layers); |
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/** |
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* @var Layered[] $replies |
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*/ |
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$replies = array_reverse($this->layers); |
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foreach ($replies as $idx => $layer) { |
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$chain = $chain->then(static function ($data) use ($ctx, $layer) { |
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return $layer->outbound($data, $ctx); |
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}, static function (Throwable $e) use ($ctx, $layer, $idx, $size) { |
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if (($ctx->get(self::XID) ?? 999) >= ($size - $idx - 1)) { |
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$layer->exception($e, $ctx); |
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} else { |
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throw $e; |
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} |
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}); |
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} |
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$seed->resolve($initial, $ctx); |
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return $chain; |
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} |
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/** |
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* @return Closure |
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*/ |
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public function handler() : Closure |
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{ |
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return function ($initial, Context $ctx = null) { |
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try { |
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return $this->processing($ctx ?? new Context, $initial); |
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} catch (Throwable $e) { |
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return Promise::rejected($e); |
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} |
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}; |
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} |
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} |
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carno-php /
chain
