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File Content: `BatchDelete.php`

<?php
namespace Aws\S3;

use Aws\AwsClientInterface;
use Aws\S3\Exception\DeleteMultipleObjectsException;
use GuzzleHttp\Promise;
use GuzzleHttp\Promise\PromisorInterface;
use GuzzleHttp\Promise\PromiseInterface;

/**
 * Efficiently deletes many objects from a single Amazon S3 bucket using an
 * iterator that yields keys. Deletes are made using the DeleteObjects API
 * operation.
 *
 *     $s3 = new Aws\S3\Client([
 *         'region' => 'us-west-2',
 *         'version' => 'latest'
 *     ]);
 *
 *     $listObjectsParams = ['Bucket' => 'foo', 'Prefix' => 'starts/with/'];
 *     $delete = Aws\S3\BatchDelete::fromListObjects($s3, $listObjectsParams);
 *     // Asynchronously delete
 *     $promise = $delete->promise();
 *     // Force synchronous completion
 *     $delete->delete();
 *
 * When using one of the batch delete creational static methods, you can supply
 * an associative array of options:
 *
 * - before: Function invoked before executing a command. The function is
 *   passed the command that is about to be executed. This can be useful
 *   for logging, adding custom request headers, etc.
 * - batch_size: The size of each delete batch. Defaults to 1000.
 *
 * @link http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
 */
class BatchDelete implements PromisorInterface
{
    private $bucket;
    /** @var AwsClientInterface */
    private $client;
    /** @var callable */
    private $before;
    /** @var PromiseInterface */
    private $cachedPromise;
    /** @var callable */
    private $promiseCreator;
    private $batchSize = 1000;
    private $queue = [];

    /**
     * Creates a BatchDelete object from all of the paginated results of a
     * ListObjects operation. Each result that is returned by the ListObjects
     * operation will be deleted.
     *
     * @param AwsClientInterface $client            AWS Client to use.
     * @param array              $listObjectsParams ListObjects API parameters
     * @param array              $options           BatchDelete options.
     *
     * @return BatchDelete
     */
    public static function fromListObjects(
        AwsClientInterface $client,
        array $listObjectsParams,
        array $options = []
    ) {
        $iter = $client->getPaginator('ListObjects', $listObjectsParams);
        $bucket = $listObjectsParams['Bucket'];
        $fn = function (BatchDelete $that) use ($iter) {
            return $iter->each(function ($result) use ($that) {
                $promises = [];
                if (is_array($result['Contents'])) {
                    foreach ($result['Contents'] as $object) {
                        if ($promise = $that->enqueue($object)) {
                            $promises[] = $promise;
                        }
                    }
                }
                return $promises ? Promise\all($promises) : null;
            });
        };

        return new self($client, $bucket, $fn, $options);
    }

    /**
     * Creates a BatchDelete object from an iterator that yields results.
     *
     * @param AwsClientInterface $client  AWS Client to use to execute commands
     * @param string             $bucket  Bucket where the objects are stored
     * @param \Iterator          $iter    Iterator that yields assoc arrays
     * @param array              $options BatchDelete options
     *
     * @return BatchDelete
     */
    public static function fromIterator(
        AwsClientInterface $client,
        $bucket,
        \Iterator $iter,
        array $options = []
    ) {
        $fn = function (BatchDelete $that) use ($iter) {
            return Promise\coroutine(function () use ($that, $iter) {
                foreach ($iter as $obj) {
                    if ($promise = $that->enqueue($obj)) {
                        yield $promise;
                    }
                }
            });
        };

        return new self($client, $bucket, $fn, $options);
    }

    public function promise()
    {
        if (!$this->cachedPromise) {
            $this->cachedPromise = $this->createPromise();
        }

        return $this->cachedPromise;
    }

    /**
     * Synchronously deletes all of the objects.
     *
     * @throws DeleteMultipleObjectsException on error.
     */
    public function delete()
    {
        $this->promise()->wait();
    }

    /**
     * @param AwsClientInterface $client    Client used to transfer the requests
     * @param string             $bucket    Bucket to delete from.
     * @param callable           $promiseFn Creates a promise.
     * @param array              $options   Hash of options used with the batch
     *
     * @throws \InvalidArgumentException if the provided batch_size is <= 0
     */
    private function __construct(
        AwsClientInterface $client,
        $bucket,
        callable $promiseFn,
        array $options = []
    ) {
        $this->client = $client;
        $this->bucket = $bucket;
        $this->promiseCreator = $promiseFn;

        if (isset($options['before'])) {
            if (!is_callable($options['before'])) {
                throw new \InvalidArgumentException('before must be callable');
            }
            $this->before = $options['before'];
        }

        if (isset($options['batch_size'])) {
            if ($options['batch_size'] <= 0) {
                throw new \InvalidArgumentException('batch_size is not > 0');
            }
            $this->batchSize = min($options['batch_size'], 1000);
        }
    }

    private function enqueue(array $obj)
    {
        $this->queue[] = $obj;
        return count($this->queue) >= $this->batchSize
            ? $this->flushQueue()
            : null;
    }

    private function flushQueue()
    {
        static $validKeys = ['Key' => true, 'VersionId' => true];

        if (count($this->queue) === 0) {
            return null;
        }

        $batch = [];
        while ($obj = array_shift($this->queue)) {
            $batch[] = array_intersect_key($obj, $validKeys);
        }

        $command = $this->client->getCommand('DeleteObjects', [
            'Bucket' => $this->bucket,
            'Delete' => ['Objects' => $batch]
        ]);

        if ($this->before) {
            call_user_func($this->before, $command);
        }

        return $this->client->executeAsync($command)
            ->then(function ($result) {
                if (!empty($result['Errors'])) {
                    throw new DeleteMultipleObjectsException(
                        $result['Deleted'] ?: [],
                        $result['Errors']
                    );
                }
                return $result;
            });
    }

    /**
     * Returns a promise that will clean up any references when it completes.
     *
     * @return PromiseInterface
     */
    private function createPromise()
    {
        // Create the promise
        $promise = call_user_func($this->promiseCreator, $this);
        $this->promiseCreator = null;

        // Cleans up the promise state and references.
        $cleanup = function () {
            $this->before = $this->client = $this->queue = null;
        };

        // When done, ensure cleanup and that any remaining are processed.
        return $promise->then(
            function () use ($cleanup)  {
                return Promise\promise_for($this->flushQueue())
                    ->then($cleanup);
            },
            function ($reason) use ($cleanup)  {
                $cleanup();
                return Promise\rejection_for($reason);
            }
        );
    }
}

Name	Size	Permission
Crypto	---	0755
Exception	---	0755
RegionalEndpoint	---	0755
UseArnRegion	---	0755
AmbiguousSuccessParser.php	2280 bytes	0644
ApplyChecksumMiddleware.php	1897 bytes	0644
BatchDelete.php	7581 bytes	0644
BucketEndpointArnMiddleware.php	9874 bytes	0644
BucketEndpointMiddleware.php	1914 bytes	0644
EndpointRegionHelperTrait.php	3466 bytes	0644
GetBucketLocationParser.php	1320 bytes	0644
MultipartCopy.php	6933 bytes	0644
MultipartUploader.php	6105 bytes	0644
MultipartUploadingTrait.php	3951 bytes	0644
ObjectCopier.php	5770 bytes	0644
ObjectUploader.php	5129 bytes	0644
PermanentRedirectMiddleware.php	1742 bytes	0644
PostObject.php	3927 bytes	0644
PostObjectV4.php	5430 bytes	0644
PutObjectUrlMiddleware.php	1569 bytes	0644
RetryableMalformedResponseParser.php	1453 bytes	0644
S3Client.php	42817 bytes	0644
S3ClientInterface.php	12266 bytes	0644
S3ClientTrait.php	8499 bytes	0644
S3EndpointMiddleware.php	9626 bytes	0644
S3MultiRegionClient.php	19494 bytes	0644
S3UriParser.php	5021 bytes	0644
SSECMiddleware.php	2289 bytes	0644
StreamWrapper.php	30598 bytes	0644
Transfer.php	15162 bytes	0644

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File Content: BatchDelete.php

File Content: `BatchDelete.php`