memories/lib/Db/TimelineWriteOrphans.php

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<?php
declare(strict_types=1);
namespace OCA\Memories\Db;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IDBConnection;
trait TimelineWriteOrphans
{
protected IDBConnection $connection;
/**
* Mark all or some files in the table as (un)orphaned.
*
* @param bool $value True to mark as orphaned, false to mark as un-orphaned
* @param int[] $fileIds List of file IDs to mark, or empty to mark all files
* @param bool $onlyMain Only mark the main file, not the live photo
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*
* @return int Number of rows affected
*/
public function orphanAll(bool $value = true, ?array $fileIds = null, bool $onlyMain = false): int
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{
$do = function (string $table) use ($value, $fileIds) {
$query = $this->connection->getQueryBuilder();
$query->update($table)
->set('orphan', $query->createNamedParameter($value, IQueryBuilder::PARAM_BOOL))
;
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if ($fileIds) {
$query->where($query->expr()->in('fileid', $query->createNamedParameter($fileIds, IQueryBuilder::PARAM_INT_ARRAY)));
}
return $query->executeStatement();
};
$count = $do('memories');
if ($onlyMain) {
return $count;
}
return $count + $do('memories_livephoto');
}
/**
* Orphan and run an update on all files.
*
* @param array $fields list of fields to select
* @param int $txnSize number of rows to process in a single transaction
* @param \Closure $callback will be passed each row
*/
public function orphanAndRun(array $fields, int $txnSize, \Closure $callback)
{
// Orphan all files. This means if we are interrupted,
// it will lead to a re-index of the whole library!
$this->orphanAll(true, null, true);
while (\count($orphans = $this->getSomeOrphans($txnSize, $fields))) {
$this->connection->beginTransaction();
foreach ($orphans as $row) {
$callback($row);
}
// Mark all files as not orphaned.
$fileIds = array_map(fn ($row) => $row['fileid'], $orphans);
$this->orphanAll(false, $fileIds, true);
$this->connection->commit();
}
}
/**
* Get a list of orphaned files.
*/
protected function getSomeOrphans(int $count, array $fields): array
{
$query = $this->connection->getQueryBuilder();
$query->select(...$fields)
->from('memories')
->where($query->expr()->eq('orphan', $query->expr()->literal(1)))
->setMaxResults($count)
;
return $query->executeQuery()->fetchAll();
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}
}