AmpPromiseAdapter.php
| 1 | <?php declare(strict_types=1); |
| 2 | |
| 3 | namespace Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\Adapter; |
| 4 | |
| 5 | use Amp\Deferred; |
| 6 | use Amp\Failure; |
| 7 | use Amp\Promise as AmpPromise; |
| 8 | use Amp\Success; |
| 9 | use Automattic\WooCommerce\Vendor\GraphQL\Error\InvariantViolation; |
| 10 | use Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\Promise; |
| 11 | use Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\PromiseAdapter; |
| 12 | |
| 13 | use function Amp\Promise\all; |
| 14 | |
| 15 | class AmpPromiseAdapter implements PromiseAdapter |
| 16 | { |
| 17 | public function isThenable($value): bool |
| 18 | { |
| 19 | return $value instanceof AmpPromise; |
| 20 | } |
| 21 | |
| 22 | /** @throws InvariantViolation */ |
| 23 | public function convertThenable($thenable): Promise |
| 24 | { |
| 25 | return new Promise($thenable, $this); |
| 26 | } |
| 27 | |
| 28 | /** @throws InvariantViolation */ |
| 29 | public function then(Promise $promise, ?callable $onFulfilled = null, ?callable $onRejected = null): Promise |
| 30 | { |
| 31 | $deferred = new Deferred(); |
| 32 | $onResolve = static function (?\Throwable $reason, $value) use ($onFulfilled, $onRejected, $deferred): void { |
| 33 | if ($reason === null && $onFulfilled !== null) { |
| 34 | self::resolveWithCallable($deferred, $onFulfilled, $value); |
| 35 | } elseif ($reason === null) { |
| 36 | $deferred->resolve($value); |
| 37 | } elseif ($onRejected !== null) { |
| 38 | self::resolveWithCallable($deferred, $onRejected, $reason); |
| 39 | } else { |
| 40 | $deferred->fail($reason); |
| 41 | } |
| 42 | }; |
| 43 | |
| 44 | $ampPromise = $promise->adoptedPromise; |
| 45 | assert($ampPromise instanceof AmpPromise); |
| 46 | $ampPromise->onResolve($onResolve); |
| 47 | |
| 48 | return new Promise($deferred->promise(), $this); |
| 49 | } |
| 50 | |
| 51 | /** @throws InvariantViolation */ |
| 52 | public function create(callable $resolver): Promise |
| 53 | { |
| 54 | $deferred = new Deferred(); |
| 55 | |
| 56 | $resolver( |
| 57 | static function ($value) use ($deferred): void { |
| 58 | $deferred->resolve($value); |
| 59 | }, |
| 60 | static function (\Throwable $exception) use ($deferred): void { |
| 61 | $deferred->fail($exception); |
| 62 | } |
| 63 | ); |
| 64 | |
| 65 | return new Promise($deferred->promise(), $this); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * @throws \Error |
| 70 | * @throws InvariantViolation |
| 71 | */ |
| 72 | public function createFulfilled($value = null): Promise |
| 73 | { |
| 74 | $promise = new Success($value); |
| 75 | |
| 76 | return new Promise($promise, $this); |
| 77 | } |
| 78 | |
| 79 | /** @throws InvariantViolation */ |
| 80 | public function createRejected(\Throwable $reason): Promise |
| 81 | { |
| 82 | $promise = new Failure($reason); |
| 83 | |
| 84 | return new Promise($promise, $this); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * @throws \Error |
| 89 | * @throws InvariantViolation |
| 90 | */ |
| 91 | public function all(iterable $promisesOrValues): Promise |
| 92 | { |
| 93 | /** @var array<AmpPromise<mixed>> $promises */ |
| 94 | $promises = []; |
| 95 | foreach ($promisesOrValues as $key => $item) { |
| 96 | if ($item instanceof Promise) { |
| 97 | $ampPromise = $item->adoptedPromise; |
| 98 | assert($ampPromise instanceof AmpPromise); |
| 99 | $promises[$key] = $ampPromise; |
| 100 | } elseif ($item instanceof AmpPromise) { |
| 101 | $promises[$key] = $item; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | $deferred = new Deferred(); |
| 106 | |
| 107 | all($promises)->onResolve(static function (?\Throwable $reason, ?array $values) use ($promisesOrValues, $deferred): void { |
| 108 | if ($reason === null) { |
| 109 | assert(is_array($values), 'Either $reason or $values must be passed'); |
| 110 | |
| 111 | $promisesOrValuesArray = is_array($promisesOrValues) |
| 112 | ? $promisesOrValues |
| 113 | : iterator_to_array($promisesOrValues); |
| 114 | $resolvedValues = array_replace($promisesOrValuesArray, $values); |
| 115 | $deferred->resolve($resolvedValues); |
| 116 | |
| 117 | return; |
| 118 | } |
| 119 | |
| 120 | $deferred->fail($reason); |
| 121 | }); |
| 122 | |
| 123 | return new Promise($deferred->promise(), $this); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * @template TArgument |
| 128 | * @template TResult of AmpPromise<mixed> |
| 129 | * |
| 130 | * @param Deferred<TResult> $deferred |
| 131 | * @param callable(TArgument): TResult $callback |
| 132 | * @param TArgument $argument |
| 133 | */ |
| 134 | private static function resolveWithCallable(Deferred $deferred, callable $callback, $argument): void |
| 135 | { |
| 136 | try { |
| 137 | $result = $callback($argument); |
| 138 | } catch (\Throwable $exception) { |
| 139 | $deferred->fail($exception); |
| 140 | |
| 141 | return; |
| 142 | } |
| 143 | |
| 144 | if ($result instanceof Promise) { |
| 145 | /** @var TResult $result */ |
| 146 | $result = $result->adoptedPromise; |
| 147 | } |
| 148 | |
| 149 | $deferred->resolve($result); |
| 150 | } |
| 151 | } |
| 152 |