/**
* scan all the files and folders in a folder
*
* @param string $path
* @param bool $recursive
* @param int $reuse
* @param array $folderData existing cache data for the folder to be scanned
* @param bool $lock set to false to disable getting an additional read lock during scanning
* @return int the size of the scanned folder or -1 if the size is unknown at this stage
*/
protected function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $folderData = null, $lock = true)
{
if ($reuse === -1) {
$reuse = $recursive === self::SCAN_SHALLOW ? self::REUSE_ETAG | self::REUSE_SIZE : self::REUSE_ETAG;
}
$this->emit('\\OC\\Files\\Cache\\Scanner', 'scanFolder', array($path, $this->storageId));
$size = 0;
$childQueue = array();
if (is_array($folderData) and isset($folderData['fileid'])) {
$folderId = $folderData['fileid'];
} else {
$folderId = $this->cache->getId($path);
}
$existingChildren = $this->getExistingChildren($folderId);
$newChildren = $this->getNewChildren($path);
if ($this->useTransactions) {
\OC_DB::beginTransaction();
}
$exceptionOccurred = false;
foreach ($newChildren as $file) {
$child = $path ? $path . '/' . $file : $file;
try {
$existingData = isset($existingChildren[$file]) ? $existingChildren[$file] : null;
$data = $this->scanFile($child, $reuse, $folderId, $existingData, $lock);
if ($data) {
if ($data['mimetype'] === 'httpd/unix-directory' and $recursive === self::SCAN_RECURSIVE) {
$childQueue[$child] = $data;
} else {
if ($data['size'] === -1) {
$size = -1;
} else {
if ($size !== -1) {
$size += $data['size'];
}
}
}
}
} catch (\Doctrine\DBAL\DBALException $ex) {
// might happen if inserting duplicate while a scanning
// process is running in parallel
// log and ignore
\OCP\Util::writeLog('core', 'Exception while scanning file "' . $child . '": ' . $ex->getMessage(), \OCP\Util::DEBUG);
$exceptionOccurred = true;
} catch (\OCP\Lock\LockedException $e) {
if ($this->useTransactions) {
\OC_DB::rollback();
}
throw $e;
}
}
$removedChildren = \array_diff(array_keys($existingChildren), $newChildren);
foreach ($removedChildren as $childName) {
$child = $path ? $path . '/' . $childName : $childName;
$this->removeFromCache($child);
}
if ($this->useTransactions) {
\OC_DB::commit();
}
if ($exceptionOccurred) {
// It might happen that the parallel scan process has already
// inserted mimetypes but those weren't available yet inside the transaction
// To make sure to have the updated mime types in such cases,
// we reload them here
\OC::$server->getMimeTypeLoader()->reset();
}
foreach ($childQueue as $child => $childData) {
$childSize = $this->scanChildren($child, self::SCAN_RECURSIVE, $reuse, $childData, $lock);
if ($childSize === -1) {
$size = -1;
} else {
if ($size !== -1) {
$size += $childSize;
}
}
}
if (!is_array($folderData) or !isset($folderData['size']) or $folderData['size'] !== $size) {
$this->updateCache($path, array('size' => $size), $folderId);
}
$this->emit('\\OC\\Files\\Cache\\Scanner', 'postScanFolder', array($path, $this->storageId));
return $size;
}
/**
* Rollback the database changes done during a transaction that is in progress
*/
public static function rollback()
{
\OC_DB::rollback();
}
