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Reuse cache data of existing files during scan

This commit is contained in:
Robin Appelman 2014-09-10 15:57:59 +02:00
parent 9baf7a0a3f
commit 4242dd0d9d
1 changed files with 116 additions and 69 deletions
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185
lib/private/files/cache/scanner.php vendored
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@ -104,9 +104,11 @@ class Scanner extends BasicEmitter {
*
* @param string $file
* @param int $reuseExisting
* @param int $parentId
* @param array | null $cacheData existing data in the cache for the file to be scanned
* @return array an array of metadata of the scanned file
*/
public function scanFile($file, $reuseExisting = 0) {
public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData = null) {
if (!self::isPartialFile($file)
and !Filesystem::isFileBlacklisted($file)
) {
@ -118,7 +120,9 @@ class Scanner extends BasicEmitter {
if ($parent === '.' or $parent === '/') {
$parent = '';
}
$parentId = $this->cache->getId($parent);
if ($parentId === -1) {
$parentId = $this->cache->getId($parent);
}
// scan the parent if it's not in the cache (id -1) and the current file is not the root folder
if ($file and $parentId === -1) {
@ -128,14 +132,18 @@ class Scanner extends BasicEmitter {
if ($parent) {
$data['parent'] = $parentId;
}
$cacheData = $this->cache->get($file);
if ($cacheData and $reuseExisting) {
if (is_null($cacheData)) {
$cacheData = $this->cache->get($file);
}
if ($cacheData and $reuseExisting and isset($cacheData['fileid'])) {
// prevent empty etag
if (empty($cacheData['etag'])) {
$etag = $data['etag'];
} else {
$etag = $cacheData['etag'];
}
$fileId = $cacheData['fileid'];
$data['fileid'] = $fileId;
// only reuse data if the file hasn't explicitly changed
if (isset($data['storage_mtime']) && isset($cacheData['storage_mtime']) && $data['storage_mtime'] === $cacheData['storage_mtime']) {
$data['mtime'] = $cacheData['mtime'];
@ -150,9 +158,10 @@ class Scanner extends BasicEmitter {
$newData = array_diff_assoc($data, $cacheData);
} else {
$newData = $data;
$fileId = -1;
}
if (!empty($newData)) {
$data['fileid'] = $this->addToCache($file, $newData);
$data['fileid'] = $this->addToCache($file, $newData, $fileId);
$this->emit('\OC\Files\Cache\Scanner', 'postScanFile', array($file, $this->storageId));
\OC_Hook::emit('\OC\Files\Cache\Scanner', 'post_scan_file', array('path' => $file, 'storage' => $this->storageId));
}
@ -175,13 +184,19 @@ class Scanner extends BasicEmitter {
/**
* @param string $path
* @param array $data
* @param int $fileId
* @return int the id of the added file
*/
protected function addToCache($path, $data) {
protected function addToCache($path, $data, $fileId = -1) {
\OC_Hook::emit('Scanner', 'addToCache', array('file' => $path, 'data' => $data));
$this->emit('\OC\Files\Cache\Scanner', 'addToCache', array($path, $this->storageId, $data));
if ($this->cacheActive) {
return $this->cache->put($path, $data);
if ($fileId !== -1) {
$this->cache->update($fileId, $data);
return $fileId;
} else {
return $this->cache->put($path, $data);
}
} else {
return -1;
}
@ -190,12 +205,17 @@ class Scanner extends BasicEmitter {
/**
* @param string $path
* @param array $data
* @param int $fileId
*/
protected function updateCache($path, $data) {
protected function updateCache($path, $data, $fileId = -1) {
\OC_Hook::emit('Scanner', 'addToCache', array('file' => $path, 'data' => $data));
$this->emit('\OC\Files\Cache\Scanner', 'updateCache', array($path, $this->storageId, $data));
if ($this->cacheActive) {
$this->cache->put($path, $data);
if ($fileId !== -1) {
$this->cache->update($fileId, $data);
} else {
$this->cache->put($path, $data);
}
}
}
@ -219,90 +239,117 @@ class Scanner extends BasicEmitter {
return $data;
}
protected function getExistingChildren($path) {
/**
* Get the children currently in the cache
*
* @param int $folderId
* @return array[]
*/
protected function getExistingChildren($folderId) {
$existingChildren = array();
if ($this->cache->inCache($path)) {
$children = $this->cache->getFolderContents($path);
foreach ($children as $child) {
$existingChildren[] = $child['name'];
}
$children = $this->cache->getFolderContentsById($folderId);
foreach ($children as $child) {
$existingChildren[$child['name']] = $child;
}
return $existingChildren;
}
/**
* Get the children from the storage
*
* @param string $folder
* @return string[]
*/
protected function getNewChildren($folder) {
$children = array();
if ($this->storage->is_dir($folder) && ($dh = $this->storage->opendir($folder))) {
if (is_resource($dh)) {
while (($file = readdir($dh)) !== false) {
if (!Filesystem::isIgnoredDir($file)) {
$children[] = $file;
}
}
}
}
return $children;
}
/**
* scan all the files and folders in a folder
*
* @param string $path
* @param bool $recursive
* @param int $reuse
* @param array $folderData existing cache data for the folder to be scanned
* @return int the size of the scanned folder or -1 if the size is unknown at this stage
*/
public function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1) {
protected function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $folderData = null) {
if ($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();
$existingChildren = $this->getExistingChildren($path);
$newChildren = array();
if ($this->storage->is_dir($path) && ($dh = $this->storage->opendir($path))) {
$exceptionOccurred = false;
if ($this->useTransactions) {
\OC_DB::beginTransaction();
}
if (is_resource($dh)) {
while (($file = readdir($dh)) !== false) {
$child = ($path) ? $path . '/' . $file : $file;
if (!Filesystem::isIgnoredDir($file)) {
$newChildren[] = $file;
try {
$data = $this->scanFile($child, $reuse);
if ($data) {
if ($data['mimetype'] === 'httpd/unix-directory' and $recursive === self::SCAN_RECURSIVE) {
$childQueue[] = $child;
} else if ($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
\OC_Log::write('core', 'Exception while scanning file "' . $child . '": ' . $ex->getMessage(), \OC_Log::DEBUG);
$exceptionOccurred = true;
}
if (is_array($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, $existingData);
if ($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
\OC_Log::write('core', 'Exception while scanning file "' . $child . '": ' . $ex->getMessage(), \OC_Log::DEBUG);
$exceptionOccurred = true;
}
$removedChildren = \array_diff($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
$this->cache->loadMimetypes();
}
}
$removedChildren = \array_diff(array_keys($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
$this->cache->loadMimetypes();
}
foreach ($childQueue as $child) {
$childSize = $this->scanChildren($child, self::SCAN_RECURSIVE, $reuse);
if ($childSize === -1) {
$size = -1;
} else if ($size !== -1) {
$size += $childSize;
}
foreach ($childQueue as $child => $childData) {
$childSize = $this->scanChildren($child, self::SCAN_RECURSIVE, $reuse, $childData);
if ($childSize === -1) {
$size = -1;
} else if ($size !== -1) {
$size += $childSize;
}
$this->updateCache($path, array('size' => $size));
}
if (!is_array($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;