TransformerManager::transform

public function transform($fileId)
{
	$result = new Result();
	if (!Loader::includeModule('transformer'))
	{
		$result->addError(new Error('Could not include module transformer'));

		return $result;
	}

	$fileData = CFile::getByID($fileId)->fetch();
	if (!$fileData)
	{
		$result->addError(new Error('Could not find file'));

		return $result;
	}

	$transformation = $this->buildTransformationByFile($fileData);
	if (!$transformation)
	{
		$result->addError(new Error('There is no transformation for file'));

		return $result;
	}

	if(
		$transformation->getInputMaxSize() > 0 &&
		$fileData['FILE_SIZE'] > $transformation->getInputMaxSize()
	)
	{
		$result->addError(new Error('Too big file for transformation'));

		return $result;
	}

	$transformer = $transformation->buildTransformer();
	if (!$transformer)
	{
		$result->addError(new Error('Could not build transformer'));

		return $result;
	}

	$shouldSendPullTag = true;
	$information = $this->getTransformationInformation($fileId);
	if ($this->shouldSendToTransformation($information, $fileData))
	{
		$result = $transformer->transform(
			(int)$fileId,
			[$transformation->getOutputExtension()],
			'main',
			CallbackHandler::class,
			['id' => $fileId, 'fileId' => $fileId, 'queue' => self::QUEUE_NAME]
		);

		if (!$result->isSuccess())
		{
			$shouldSendPullTag = false;
		}
	}

	if (isset($information['status']) && $information['status'] == Command::STATUS_ERROR)
	{
		$shouldSendPullTag = false;
		$result->addError(new Error('Could not transform file', Command::STATUS_ERROR));
	}

	if ($shouldSendPullTag)
	{
		$pullTag = $this->subscribeCurrentUserForTransformation($fileId);
		$result->setData([
			'pullTag' => $pullTag,
	 	]);
	}

	return $result;
}