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PhabricatorFileUploadSource.php
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Mon, Jan 27, 04:56

PhabricatorFileUploadSource.php
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<?php
abstract class PhabricatorFileUploadSource
extends Phobject {
private $name;
private $relativeTTL;
private $viewPolicy;
private $rope;
private $data;
private $shouldChunk;
private $didRewind;
private $totalBytesWritten = 0;
private $totalBytesRead = 0;
private $byteLimit = 0;
public function setName($name) {
$this->name = $name;
return $this;
}
public function getName() {
return $this->name;
}
public function setRelativeTTL($relative_ttl) {
$this->relativeTTL = $relative_ttl;
return $this;
}
public function getRelativeTTL() {
return $this->relativeTTL;
}
public function setViewPolicy($view_policy) {
$this->viewPolicy = $view_policy;
return $this;
}
public function getViewPolicy() {
return $this->viewPolicy;
}
public function setByteLimit($byte_limit) {
$this->byteLimit = $byte_limit;
return $this;
}
public function getByteLimit() {
return $this->byteLimit;
}
public function uploadFile() {
if (!$this->shouldChunkFile()) {
return $this->writeSingleFile();
} else {
return $this->writeChunkedFile();
}
}
private function getDataIterator() {
if (!$this->data) {
$this->data = $this->newDataIterator();
}
return $this->data;
}
private function getRope() {
if (!$this->rope) {
$this->rope = new PhutilRope();
}
return $this->rope;
}
abstract protected function newDataIterator();
abstract protected function getDataLength();
private function readFileData() {
$data = $this->getDataIterator();
if (!$this->didRewind) {
$data->rewind();
$this->didRewind = true;
} else {
if ($data->valid()) {
$data->next();
}
}
if (!$data->valid()) {
return false;
}
$read_bytes = $data->current();
$this->totalBytesRead += strlen($read_bytes);
if ($this->byteLimit && ($this->totalBytesRead > $this->byteLimit)) {
throw new PhabricatorFileUploadSourceByteLimitException();
}
$rope = $this->getRope();
$rope->append($read_bytes);
return true;
}
private function shouldChunkFile() {
if ($this->shouldChunk !== null) {
return $this->shouldChunk;
}
$threshold = PhabricatorFileStorageEngine::getChunkThreshold();
if ($threshold === null) {
// If there are no chunk engines available, we clearly can't chunk the
// file.
$this->shouldChunk = false;
} else {
// If we don't know how large the file is, we're going to read some data
// from it until we know whether it's a small file or not. This will give
// us enough information to make a decision about chunking.
$length = $this->getDataLength();
if ($length === null) {
$rope = $this->getRope();
while ($this->readFileData()) {
$length = $rope->getByteLength();
if ($length > $threshold) {
break;
}
}
}
$this->shouldChunk = ($length > $threshold);
}
return $this->shouldChunk;
}
private function writeSingleFile() {
while ($this->readFileData()) {
// Read the entire file.
}
$rope = $this->getRope();
$data = $rope->getAsString();
$parameters = $this->getNewFileParameters();
return PhabricatorFile::newFromFileData($data, $parameters);
}
private function writeChunkedFile() {
$engine = $this->getChunkEngine();
$parameters = $this->getNewFileParameters();
$data_length = $this->getDataLength();
if ($data_length !== null) {
$length = $data_length;
} else {
$length = 0;
}
$file = PhabricatorFile::newChunkedFile($engine, $length, $parameters);
$file->saveAndIndex();
$rope = $this->getRope();
// Read the source, writing chunks as we get enough data.
while ($this->readFileData()) {
while (true) {
$rope_length = $rope->getByteLength();
if ($rope_length < $engine->getChunkSize()) {
break;
}
$this->writeChunk($file, $engine);
}
}
// If we have extra bytes at the end, write them. Note that it's possible
// that we have more than one chunk of bytes left if the read was very
// fast.
while ($rope->getByteLength()) {
$this->writeChunk($file, $engine);
}
$file->setIsPartial(0);
if ($data_length === null) {
$file->setByteSize($this->getTotalBytesWritten());
}
$file->save();
return $file;
}
private function writeChunk(
PhabricatorFile $file,
PhabricatorFileStorageEngine $engine) {
$offset = $this->getTotalBytesWritten();
$max_length = $engine->getChunkSize();
$rope = $this->getRope();
$data = $rope->getPrefixBytes($max_length);
$actual_length = strlen($data);
$rope->removeBytesFromHead($actual_length);
$params = array(
'name' => $file->getMonogram().'.chunk-'.$offset,
'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
'chunk' => true,
);
// If this isn't the initial chunk, provide a dummy MIME type so we do not
// try to detect it. See T12857.
if ($offset > 0) {
$params['mime-type'] = 'application/octet-stream';
}
$chunk_data = PhabricatorFile::newFromFileData($data, $params);
$chunk = PhabricatorFileChunk::initializeNewChunk(
$file->getStorageHandle(),
$offset,
$offset + $actual_length);
$chunk
->setDataFilePHID($chunk_data->getPHID())
->save();
$this->setTotalBytesWritten($offset + $actual_length);
return $chunk;
}
private function getNewFileParameters() {
$parameters = array(
'name' => $this->getName(),
'viewPolicy' => $this->getViewPolicy(),
);
$ttl = $this->getRelativeTTL();
if ($ttl !== null) {
$parameters['ttl.relative'] = $ttl;
}
return $parameters;
}
private function getChunkEngine() {
$chunk_engines = PhabricatorFileStorageEngine::loadWritableChunkEngines();
if (!$chunk_engines) {
throw new Exception(
pht(
'Unable to upload file: this server is not configured with any '.
'storage engine which can store large files.'));
}
return head($chunk_engines);
}
private function setTotalBytesWritten($total_bytes_written) {
$this->totalBytesWritten = $total_bytes_written;
return $this;
}
private function getTotalBytesWritten() {
return $this->totalBytesWritten;
}
}

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