/**
* Roll back the DB transaction and mark the image unlocked
*/
function unlockAndRollback()
{
$this->locked = false;
$dbw = $this->repo->getMasterDB();
$dbw->rollback(__METHOD__);
$this->lockedOwnTrx = false;
}
/**
* Get the chunk db state and populate update relevant local values
*/
private function getChunkStatus()
{
// get Master db to avoid race conditions.
// Otherwise, if chunk upload time < replag there will be spurious errors
$dbw = $this->repo->getMasterDB();
$row = $dbw->selectRow('uploadstash', ['us_chunk_inx', 'us_size', 'us_path'], ['us_key' => $this->mFileKey], __METHOD__);
// Handle result:
if ($row) {
$this->mChunkIndex = $row->us_chunk_inx;
$this->mOffset = $row->us_size;
$this->mVirtualTempPath = $row->us_path;
}
}
/**
* Helper function: do the actual database query to fetch file metadata.
*
* @param string $key
* @param int $readFromDB Constant (default: DB_REPLICA)
* @return bool
*/
protected function fetchFileMetadata($key, $readFromDB = DB_REPLICA)
{
// populate $fileMetadata[$key]
$dbr = null;
if ($readFromDB === DB_MASTER) {
// sometimes reading from the master is necessary, if there's replication lag.
$dbr = $this->repo->getMasterDB();
} else {
$dbr = $this->repo->getSlaveDB();
}
$row = $dbr->selectRow('uploadstash', '*', ['us_key' => $key], __METHOD__);
if (!is_object($row)) {
// key wasn't present in the database. this will happen sometimes.
return false;
}
$this->fileMetadata[$key] = (array) $row;
$this->fileMetadata[$key]['us_props'] = $dbr->decodeBlob($row->us_props);
return true;
}