AWS sdk: how to slow down requests - php

Question

The scenario:
I use this function to upload a entire directory to AWS bucket at once and some folders are really big (like 30GBs) of photos.
$client->uploadDirectory(
MY_SOURCE,
SPACES_NAME,
DESTINATION,
array(
'concurrency' => 1,
'debug' => TRUE,
'force' => FALSE,
'options' => array(
'ServerSideEncryption' => 'AES256',
),
)
);
The error:
Even with concurrency = 1, after a while my script end's up with the following error:
503 Slowdown Please reduce your request rate.
My question is
Is there some parameter that limit requests? Readding docs I can't find a way to make this function slow down requests. I know there's a limit of 100 files/second and I want to obey this limit, but don't know where to put this.

Answer 1

You can try to use Middlewares to slow down the requests. Something like this:
use Aws\Middleware;
use Psr\Http\Message\RequestInterface;
...
$s3Client->getHandlerList()->appendInit(Middleware::mapRequest(function (RequestInterface $request) {
sleep(1);
return $request;
}));
$s3Client->uploadDirectory(...);
See the docs.

Answer 2

Ok, I'v found a solution:
First, I have a specific server to do this, scripts run without time limit and can use a really good ammount of memory.
$counter = 0;
$files = scanDirAndSubdir($folder);
foreach($files as $file){
if(is_file($file)){
$ACL = 'private';
$insert[] = $client->getCommand('putObject',array(
'Bucket' => SPACES_NAME,
'Key' => $file,
'SourceFile' => $file,
'ACL' => $ACL,
));
if($counter==100){
// Executes all commands at once
$pool = new Aws\CommandPool($client, $insert);
$promisse = $pool->promise();
$promisse->wait();
$counter = 0;
sleep(1);
}
$counter ++;
}
}