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Catch and ignore UniqueConstraintViolationException in file locking init #12366

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Catch and ignore UniqueConstraintViolationException in file locking init #12366

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11 changes: 10 additions & 1 deletion lib/private/Lock/DBLockingProvider.php
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@

namespace OC\Lock;

use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
use OC\DB\QueryBuilder\Literal;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\DB\QueryBuilder\IQueryBuilder;
Expand Down Expand Up @@ -133,7 +134,15 @@ public function __construct(

protected function initLockField(string $path, int $lock = 0): int {
$expire = $this->getExpireTime();
return $this->connection->insertIfNotExist('*PREFIX*file_locks', ['key' => $path, 'lock' => $lock, 'ttl' => $expire], ['key']);
try {
return $this->connection->insertIfNotExist('*PREFIX*file_locks', ['key' => $path, 'lock' => $lock, 'ttl' => $expire], ['key']);
} catch (UniqueConstraintViolationException $e) {
// if this is thrown then a concurrent insert happened between the insert and the sub-select in the insert, that should have avoided it
// it's fine to ignore this then
//
// more discussions about this can be found at https://github.com/nextcloud/server/pull/12315
return 0;
}
}

/**
Expand Down