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<?php
namespace Aws\S3;
use GuzzleHttp\Promise\PromisorInterface;
use GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Uploads an object to S3, using a PutObject command or a multipart upload as
* appropriate.
*/
class ObjectUploader implements PromisorInterface
{
const DEFAULT_MULTIPART_THRESHOLD = 16777216;
private $client;
private $bucket;
private $key;
private $body;
private $acl;
private $options;
private static $defaults = [
'before_upload' => null,
'concurrency' => 3,
'mup_threshold' => self::DEFAULT_MULTIPART_THRESHOLD,
'params' => [],
'part_size' => null,
];
/**
* @param S3ClientInterface $client The S3 Client used to execute
* the upload command(s).
* @param string $bucket Bucket to upload the object.
* @param string $key Key of the object.
* @param mixed $body Object data to upload. Can be a
* StreamInterface, PHP stream
* resource, or a string of data to
* upload.
* @param string $acl ACL to apply to the copy
* (default: private).
* @param array $options Options used to configure the
* copy process. Options passed in
* through 'params' are added to
* the sub command(s).
*/
public function __construct(
S3ClientInterface $client,
$bucket,
$key,
$body,
$acl = 'private',
array $options = []
) {
$this->client = $client;
$this->bucket = $bucket;
$this->key = $key;
$this->body = Psr7\stream_for($body);
$this->acl = $acl;
$this->options = $options + self::$defaults;
}
public function promise()
{
/** @var int $mup_threshold */
$mup_threshold = $this->options['mup_threshold'];
if ($this->requiresMultipart($this->body, $mup_threshold)) {
// Perform a multipart upload.
return (new MultipartUploader($this->client, $this->body, [
'bucket' => $this->bucket,
'key' => $this->key,
'acl' => $this->acl
] + $this->options))->promise();
} else {
// Perform a regular PutObject operation.
$command = $this->client->getCommand('PutObject', [
'Bucket' => $this->bucket,
'Key' => $this->key,
'Body' => $this->body,
'ACL' => $this->acl,
] + $this->options['params']);
if (is_callable($this->options['before_upload'])) {
$this->options['before_upload']($command);
}
return $this->client->executeAsync($command);
}
}
public function upload()
{
return $this->promise()->wait();
}
/**
* Determines if the body should be uploaded using PutObject or the
* Multipart Upload System. It also modifies the passed-in $body as needed
* to support the upload.
*
* @param StreamInterface $body Stream representing the body.
* @param integer $threshold Minimum bytes before using Multipart.
*
* @return bool
*/
private function requiresMultipart(StreamInterface &$body, $threshold)
{
// If body size known, compare to threshold to determine if Multipart.
if ($body->getSize() !== null) {
return $body->getSize() >= $threshold;
}
/**
* Handle the situation where the body size is unknown.
* Read up to 5MB into a buffer to determine how to upload the body.
* @var StreamInterface $buffer
*/
$buffer = Psr7\stream_for();
Psr7\copy_to_stream($body, $buffer, MultipartUploader::PART_MIN_SIZE);
// If body < 5MB, use PutObject with the buffer.
if ($buffer->getSize() < MultipartUploader::PART_MIN_SIZE) {
$buffer->seek(0);
$body = $buffer;
return false;
}
// If body >= 5 MB, then use multipart. [YES]
if ($body->isSeekable()) {
// If the body is seekable, just rewind the body.
$body->seek(0);
} else {
// If the body is non-seekable, stitch the rewind the buffer and
// the partially read body together into one stream. This avoids
// unnecessary disc usage and does not require seeking on the
// original stream.
$buffer->seek(0);
$body = new Psr7\AppendStream([$buffer, $body]);
}
return true;
}
}