/**
* Create an artificial timeout for any Promise instance
*
* If the timeout expires prior to promise resolution the returned
* promise is failed.
*
* @param \Amp\Promise $promise The promise to which the timeout applies
* @param int $msTimeout The timeout in milliseconds
* @return \Amp\Promise
*/
function timeout(Promise $promise, $msTimeout)
{
$resolved = false;
$promisor = new Deferred();
$watcherId = once(function () use($promisor, &$resolved) {
$resolved = true;
$promisor->fail(new TimeoutException("Promise resolution timed out"));
}, $msTimeout);
$promise->when(function ($error = null, $result = null) use($promisor, $watcherId, &$resolved) {
if ($resolved) {
return;
}
$resolved = true;
cancel($watcherId);
if ($error) {
$promisor->fail($error);
} else {
$promisor->succeed($result);
}
});
return $promisor->promise();
}
