Amazon S3 Multi-Region Client

The AWS SDK for PHP provides a generic multi-region client that can be used with any service, which allows users to specify to which region to send a command by providing an @region input parameter to any command. In addition, the SDK provides a multi-region client for Amazon S3 that responds intelligently to specific S3 errors and reroutes commands accordingly. This allows users to use the same client to talk to multiple regions -- a particularly useful feature for users of the Amazon S3 Stream Wrapper whose buckets reside in multiple regions.

Basic Usage

The basic usage pattern of an Amazon S3 client is the same whether using a standard S3 client or its multi-region counterpart. The only usage difference at the command level is that a region may be specified using the @region input parameter.

// Create a multi-region S3 client
$s3Client = (new \Aws\Sdk)->createMultiRegionS3(['version' => 'latest']);

// You can also use the client constructor
$s3Client = new \Aws\S3\S3MultiRegionClient([
    'version' => 'latest',
    // Any region specified while creating the client will be used as the
    // default region
    'region' => 'us-west-2',
]);

// Get the contents of a bucket
$objects = $s3Client->listObjects(['Bucket' => $bucketName]);

// If you would like to specify the region to which to send a command, do so
// by providing an @region parameter
$objects = $s3Client->listObjects([
    'Bucket' => $bucketName,
    '@region' => 'eu-west-1',
]);

Important

When using the multi-region S3 client, you will not encounter any permanent redirect exceptions. A standard S3 client will throw an instance of Aws\S3\Exception\PermanentRedirectException when a command is sent to the wrong region; a multi-region client will instead redispatch the command to the correct region.

Bucket Region Cache

Amazon S3 multi-region clients maintain an internal cache of the regions in which given buckets reside. By default, each client has its own in-memory cache. To share a cache between clients or processes, supply an instance of Aws\CacheInterface as the bucket_region_cache option to your multi-region client.

use Aws\DoctrineCacheAdapter;
use Aws\Sdk;
use Doctrine\Common\Cache\ApcuCache;

$sdk = new Aws\Sdk([
    'version' => 'latest',
    'region' => 'us-west-2',
    'S3' => [
        'bucket_region_cache' => new DoctrineCacheAdapter(new ApcuCache),
    ],
]);