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amp/lib/Success.php
2020-09-24 12:53:29 -05:00

75 lines
1.8 KiB
PHP

<?php
namespace Amp;
use React\Promise\PromiseInterface as ReactPromise;
/**
* Creates a successful promise using the given value (which can be any value except an object implementing
* `Amp\Promise` or `React\Promise\PromiseInterface`).
*
* @template-covariant TValue
* @template-implements Promise<TValue>
*/
final class Success implements Promise
{
/** @var mixed */
private $value;
/**
* @param mixed $value Anything other than a Promise object.
*
* @psalm-param TValue $value
*
* @throws \Error If a promise is given as the value.
*/
public function __construct($value = null)
{
if ($value instanceof Promise || $value instanceof ReactPromise) {
throw new \Error("Cannot use a promise as success value");
}
$this->value = $value;
}
/**
* Catches any destructor exception thrown and rethrows it to the event loop.
*/
public function __destruct()
{
try {
$this->value = null;
} catch (\Throwable $e) {
Loop::defer(static function () use ($e) {
throw $e;
});
}
}
/**
* {@inheritdoc}
*/
public function onResolve(callable $onResolved)
{
try {
$result = $onResolved(null, $this->value);
if ($result === null) {
return;
}
if ($result instanceof \Generator) {
$result = new Coroutine($result);
}
if ($result instanceof Promise || $result instanceof ReactPromise) {
Promise\rethrow($result);
}
} catch (\Throwable $e) {
Loop::defer(static function () use ($e) {
throw $e;
});
}
}
}