AmpFutureAdapter.php
2 months ago
AmpPromiseAdapter.php
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ReactPromiseAdapter.php
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SyncPromise.php
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SyncPromiseAdapter.php
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SyncPromiseQueue.php
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AmpFutureAdapter.php
182 lines
| 1 | <?php declare(strict_types=1); |
| 2 | |
| 3 | namespace Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\Adapter; |
| 4 | |
| 5 | use Amp\DeferredFuture; |
| 6 | use Amp\Future; |
| 7 | use Automattic\WooCommerce\Vendor\GraphQL\Error\InvariantViolation; |
| 8 | use Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\Promise; |
| 9 | use Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\PromiseAdapter; |
| 10 | |
| 11 | use function Amp\async; |
| 12 | use function Amp\Future\await; |
| 13 | |
| 14 | /** |
| 15 | * Allows integration with amphp/amp v3 (fiber-based futures). |
| 16 | * |
| 17 | * @see https://amphp.org/amp |
| 18 | */ |
| 19 | class AmpFutureAdapter implements PromiseAdapter |
| 20 | { |
| 21 | public function isThenable($value): bool |
| 22 | { |
| 23 | return $value instanceof Future; |
| 24 | } |
| 25 | |
| 26 | /** @throws InvariantViolation */ |
| 27 | public function convertThenable($thenable): Promise |
| 28 | { |
| 29 | return new Promise($thenable, $this); |
| 30 | } |
| 31 | |
| 32 | /** @throws InvariantViolation */ |
| 33 | public function then(Promise $promise, ?callable $onFulfilled = null, ?callable $onRejected = null): Promise |
| 34 | { |
| 35 | $future = $promise->adoptedPromise; |
| 36 | assert($future instanceof Future); |
| 37 | |
| 38 | $next = async(static function () use ($future, $onFulfilled, $onRejected) { |
| 39 | try { |
| 40 | $value = $future->await(); |
| 41 | } catch (\Throwable $reason) { |
| 42 | if ($onRejected === null) { |
| 43 | throw $reason; |
| 44 | } |
| 45 | |
| 46 | return static::unwrapResult($onRejected($reason)); |
| 47 | } |
| 48 | |
| 49 | if ($onFulfilled === null) { |
| 50 | return $value; |
| 51 | } |
| 52 | |
| 53 | return static::unwrapResult($onFulfilled($value)); |
| 54 | }); |
| 55 | |
| 56 | return new Promise($next, $this); |
| 57 | } |
| 58 | |
| 59 | /** @throws InvariantViolation */ |
| 60 | public function create(callable $resolver): Promise |
| 61 | { |
| 62 | $deferred = new DeferredFuture(); |
| 63 | |
| 64 | try { |
| 65 | $resolver( |
| 66 | static function ($value) use ($deferred): void { |
| 67 | static::resolveDeferred($deferred, $value); |
| 68 | }, |
| 69 | static function (\Throwable $exception) use ($deferred): void { |
| 70 | $deferred->error($exception); |
| 71 | } |
| 72 | ); |
| 73 | } catch (\Throwable $exception) { |
| 74 | $deferred->error($exception); |
| 75 | } |
| 76 | |
| 77 | return new Promise($deferred->getFuture(), $this); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * @throws \Error |
| 82 | * @throws InvariantViolation |
| 83 | */ |
| 84 | public function createFulfilled($value = null): Promise |
| 85 | { |
| 86 | if ($value instanceof Promise) { |
| 87 | return $value; |
| 88 | } |
| 89 | |
| 90 | if ($value instanceof Future) { |
| 91 | return new Promise($value, $this); |
| 92 | } |
| 93 | |
| 94 | return new Promise(Future::complete($value), $this); |
| 95 | } |
| 96 | |
| 97 | /** @throws InvariantViolation */ |
| 98 | public function createRejected(\Throwable $reason): Promise |
| 99 | { |
| 100 | return new Promise(Future::error($reason), $this); |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * @throws \Error |
| 105 | * @throws InvariantViolation |
| 106 | */ |
| 107 | public function all(iterable $promisesOrValues): Promise |
| 108 | { |
| 109 | $items = is_array($promisesOrValues) |
| 110 | ? $promisesOrValues |
| 111 | : iterator_to_array($promisesOrValues); |
| 112 | |
| 113 | /** @var array<Future<mixed>> $futures */ |
| 114 | $futures = []; |
| 115 | |
| 116 | foreach ($items as $key => $item) { |
| 117 | if ($item instanceof Promise) { |
| 118 | $item = $item->adoptedPromise; |
| 119 | } |
| 120 | |
| 121 | if ($item instanceof Future) { |
| 122 | $futures[$key] = $item; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | $combined = async(static function () use ($items, $futures): array { |
| 127 | if ($futures === []) { |
| 128 | return $items; |
| 129 | } |
| 130 | |
| 131 | $resolved = await($futures); |
| 132 | |
| 133 | return array_replace($items, $resolved); |
| 134 | }); |
| 135 | |
| 136 | return new Promise($combined, $this); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * @param DeferredFuture<mixed> $deferred |
| 141 | * @param mixed $value |
| 142 | */ |
| 143 | protected static function resolveDeferred(DeferredFuture $deferred, $value): void |
| 144 | { |
| 145 | if ($value instanceof Promise) { |
| 146 | $value = $value->adoptedPromise; |
| 147 | } |
| 148 | |
| 149 | if ($value instanceof Future) { |
| 150 | async(static function () use ($deferred, $value): void { |
| 151 | try { |
| 152 | $deferred->complete($value->await()); |
| 153 | } catch (\Throwable $exception) { |
| 154 | $deferred->error($exception); |
| 155 | } |
| 156 | }); |
| 157 | |
| 158 | return; |
| 159 | } |
| 160 | |
| 161 | $deferred->complete($value); |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * @param mixed $value |
| 166 | * |
| 167 | * @return mixed |
| 168 | */ |
| 169 | protected static function unwrapResult($value) |
| 170 | { |
| 171 | if ($value instanceof Promise) { |
| 172 | $value = $value->adoptedPromise; |
| 173 | } |
| 174 | |
| 175 | if ($value instanceof Future) { |
| 176 | return $value->await(); |
| 177 | } |
| 178 | |
| 179 | return $value; |
| 180 | } |
| 181 | } |
| 182 |