<?php
namespace Aws\Multipart;
use Aws\AwsClientInterface as Client;
use GuzzleHttp\Psr7;
use InvalidArgumentException as IAE;
use Psr\Http\Message\StreamInterface as Stream;
abstract class AbstractUploader extends AbstractUploadManager
{
/** @var Stream Source of the data to be uploaded. */
protected $source;
/**
* @param Client $client
* @param mixed $source
* @param array $config
*/
public function __construct(Client $client, $source, array $config = [])
{
$this->source = $this->determineSource($source);
parent::__construct($client, $config);
}
/**
* Create a stream for a part that starts at the current position and
* has a length of the upload part size (or less with the final part).
*
* @param Stream $stream
*
* @return Psr7\LimitStream
*/
protected function limitPartStream(Stream $stream)
{
// Limit what is read from the stream to the part size.
return new Psr7\LimitStream(
$stream,
$this->state->getPartSize(),
$this->source->tell()
);
}
protected function getUploadCommands(callable $resultHandler)
{
// Determine if the source can be seeked.
$seekable = $this->source->isSeekable()
&& $this->source->getMetadata('wrapper_type') === 'plainfile';
for ($partNumber = 1; $this->isEof($seekable); $partNumber++) {
// If we haven't already uploaded this part, yield a new part.
if (!$this->state->hasPartBeenUploaded($partNumber)) {
$partStartPos = $this->source->tell();
if (!($data = $this->createPart($seekable, $partNumber))) {
break;
}
$command = $this->client->getCommand(
$this->info['command']['upload'],
$data + $this->state->getId()
);
$command->getHandlerList()->appendSign($resultHandler, 'mup');
yield $command;
if ($this->source->tell() > $partStartPos) {
continue;
}
}
// Advance the source's offset if not already advanced.
if ($seekable) {
$this->source->seek(min(
$this->source->tell() + $this->state->getPartSize(),
$this->source->getSize()
));
} else {
$this->source->read($this->state->getPartSize());
}
}
}
/**
* Generates the parameters for an upload part by analyzing a range of the
* source starting from the current offset up to the part size.
*
* @param bool $seekable
* @param int $number
*
* @return array|null
*/
abstract protected function createPart($seekable, $number);
/**
* Checks if the source is at EOF.
*
* @param bool $seekable
*
* @return bool
*/
private function isEof($seekable)
{
return $seekable
? $this->source->tell() < $this->source->getSize()
: !$this->source->eof();
}
/**
* Turns the provided source into a stream and stores it.
*
* If a string is provided, it is assumed to be a filename, otherwise, it
* passes the value directly to `Psr7\stream_for()`.
*
* @param mixed $source
*
* @return Stream
*/
private function determineSource($source)
{
// Use the contents of a file as the data source.
if (is_string($source)) {
$source = Psr7\try_fopen($source, 'r');
}
// Create a source stream.
$stream = Psr7\stream_for($source);
if (!$stream->isReadable()) {
throw new IAE('Source stream must be readable.');
}
return $stream;
}
}
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