private function doLoadKeyPair(string $path) : Generator
{
$privateExists = (yield exists("{$path}/private.pem"));
$publicExists = (yield exists("{$path}/public.pem"));
$lockExists = (yield exists("{$path}/key.lock"));
if ($privateExists && $publicExists) {
while ($lockExists) {
(yield new Pause(500));
$lockExists = (yield exists("{$path}/key.lock"));
}
return new KeyPair((yield get("{$path}/private.pem")), (yield get("{$path}/public.pem")));
}
$lock = new Lock("{$path}/key.lock");
try {
$lock->acquire();
$gen = new OpenSSLKeyGenerator();
$keyPair = $gen->generate(4096);
(yield put("{$path}/private.pem", $keyPair->getPrivate()));
(yield put("{$path}/public.pem", $keyPair->getPublic()));
return $keyPair;
} catch (Exception $e) {
do {
(yield new Pause(500));
$lockExists = (yield exists("{$path}/key.lock"));
} while ($lockExists);
return new KeyPair((yield get("{$path}/private.pem")), (yield get("{$path}/public.pem")));
} finally {
$lock->release();
unlink("{$path}/key.lock");
// do not yield in finally!
}
}