/**
* Get a file and its metadata from the stash.
*
* @param $key String: key under which file information is stored
* @param $noAuth Boolean (optional) Don't check authentication. Used by maintenance scripts.
* @throws UploadStashFileNotFoundException
* @throws UploadStashNotLoggedInException
* @throws UploadStashWrongOwnerException
* @throws UploadStashBadPathException
* @return UploadStashFile
*/
public function getFile($key, $noAuth = false)
{
if (!preg_match(self::KEY_FORMAT_REGEX, $key)) {
throw new UploadStashBadPathException("key '{$key}' is not in a proper format");
}
if (!$noAuth) {
if (!$this->isLoggedIn) {
throw new UploadStashNotLoggedInException(__METHOD__ . ' No user is logged in, files must belong to users');
}
}
$dbr = $this->repo->getSlaveDb();
if (!isset($this->fileMetadata[$key])) {
// try this first. if it fails to find the row, check for lag, wait, try again. if its still missing, throw an exception.
// this more complex solution keeps things moving for page loads with many requests
// (ie. validating image ownership) when replag is high
if (!$this->fetchFileMetadata($key)) {
$lag = $dbr->getLag();
if ($lag > 0 && $lag <= self::MAX_LAG) {
// if there's not too much replication lag, just wait for the slave to catch up to our last insert.
sleep(ceil($lag));
} elseif ($lag > self::MAX_LAG) {
// that's a lot of lag to introduce into the middle of the UI.
throw new UploadStashMaxLagExceededException('Couldn\'t load stashed file metadata, and replication lag is above threshold: (MAX_LAG=' . self::MAX_LAG . ')');
}
// now that the waiting has happened, try again
$this->fetchFileMetadata($key);
}
if (!isset($this->fileMetadata[$key])) {
throw new UploadStashFileNotFoundException("key '{$key}' not found in stash");
}
// create $this->files[$key]
$this->initFile($key);
// fetch fileprops
$path = $this->fileMetadata[$key]['us_path'];
if ($this->repo->isVirtualUrl($path)) {
$path = $this->repo->resolveVirtualUrl($path);
}
$this->fileProps[$key] = File::getPropsFromPath($path);
}
if (!$this->files[$key]->exists()) {
wfDebug(__METHOD__ . " tried to get file at {$key}, but it doesn't exist\n");
throw new UploadStashBadPathException("path doesn't exist");
}
if (!$noAuth) {
if ($this->fileMetadata[$key]['us_user'] != $this->userId) {
throw new UploadStashWrongOwnerException("This file ({$key}) doesn't belong to the current user.");
}
}
return $this->files[$key];
}
/**
* Get a file and its metadata from the stash.
* The noAuth param is a bit janky but is required for automated scripts which clean out the stash.
*
* @param $key String: key under which file information is stored
* @param $noAuth Boolean (optional) Don't check authentication. Used by maintenance scripts.
* @throws UploadStashFileNotFoundException
* @throws UploadStashNotLoggedInException
* @throws UploadStashWrongOwnerException
* @throws UploadStashBadPathException
* @return UploadStashFile
*/
public function getFile($key, $noAuth = false)
{
if (!preg_match(self::KEY_FORMAT_REGEX, $key)) {
throw new UploadStashBadPathException("key '{$key}' is not in a proper format");
}
if (!$noAuth) {
if (!$this->isLoggedIn) {
throw new UploadStashNotLoggedInException(__METHOD__ . ' No user is logged in, files must belong to users');
}
}
if (!isset($this->fileMetadata[$key])) {
if (!$this->fetchFileMetadata($key)) {
// If nothing was received, it's likely due to replication lag. Check the master to see if the record is there.
$this->fetchFileMetadata($key, DB_MASTER);
}
if (!isset($this->fileMetadata[$key])) {
throw new UploadStashFileNotFoundException("key '{$key}' not found in stash");
}
// create $this->files[$key]
$this->initFile($key);
// fetch fileprops
$path = $this->fileMetadata[$key]['us_path'];
if ($this->repo->isVirtualUrl($path)) {
$path = $this->repo->resolveVirtualUrl($path);
}
$this->fileProps[$key] = File::getPropsFromPath($path);
}
if (!$this->files[$key]->exists()) {
wfDebug(__METHOD__ . " tried to get file at {$key}, but it doesn't exist\n");
throw new UploadStashBadPathException("path doesn't exist");
}
if (!$noAuth) {
if ($this->fileMetadata[$key]['us_user'] != $this->userId) {
throw new UploadStashWrongOwnerException("This file ({$key}) doesn't belong to the current user.");
}
}
return $this->files[$key];
}
