<?php
namespace Aws\Multipart;
use Aws\AwsClientInterface as Client;
use Aws\CommandInterface;
use Aws\CommandPool;
use Aws\Exception\AwsException;
use Aws\Exception\MultipartUploadException;
use Aws\Result;
use Aws\ResultInterface;
use GuzzleHttp\Promise;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Psr7;
use InvalidArgumentException as IAE;
use Psr\Http\Message\RequestInterface;
/**
* Encapsulates the execution of a multipart upload to S3 or Glacier.
*
* @internal
*/
abstract class AbstractUploadManager implements Promise\PromisorInterface
{
const DEFAULT_CONCURRENCY = 5;
/** @var array Default values for base multipart configuration */
private static $defaultConfig = [
'part_size' => null,
'state' => null,
'concurrency' => self::DEFAULT_CONCURRENCY,
'before_initiate' => null,
'before_upload' => null,
'before_complete' => null,
];
/** @var Client Client used for the upload. */
protected $client;
/** @var array Configuration used to perform the upload. */
protected $config;
/** @var array Service-specific information about the upload workflow. */
protected $info;
/** @var PromiseInterface Promise that represents the multipart upload. */
protected $promise;
/** @var UploadState State used to manage the upload. */
protected $state;
/**
* @param Client $client
* @param array $config
*/
public function __construct(Client $client, array $config = [])
{
$this->client = $client;
$this->info = $this->loadUploadWorkflowInfo();
$this->config = $config + self::$defaultConfig;
$this->state = $this->determineState();
}
/**
* Returns the current state of the upload
*
* @return UploadState
*/
public function getState()
{
return $this->state;
}
/**
* Upload the source using multipart upload operations.
*
* @return Result The result of the CompleteMultipartUpload operation.
* @throws \LogicException if the upload is already complete or aborted.
* @throws MultipartUploadException if an upload operation fails.
*/
public function upload()
{
return $this->promise()->wait();
}
/**
* Upload the source asynchronously using multipart upload operations.
*
* @return PromiseInterface
*/
public function promise()
{
if ($this->promise) {
return $this->promise;
}
return $this->promise = Promise\coroutine(function () {
// Initiate the upload.
if ($this->state->isCompleted()) {
throw new \LogicException('This multipart upload has already '
. 'been completed or aborted.'
);
} elseif (!$this->state->isInitiated()) {
$result = (yield $this->execCommand('initiate', $this->getInitiateParams()));
$this->state->setUploadId(
$this->info['id']['upload_id'],
$result[$this->info['id']['upload_id']]
);
$this->state->setStatus(UploadState::INITIATED);
}
// Create a command pool from a generator that yields UploadPart
// commands for each upload part.
$resultHandler = $this->getResultHandler($errors);
$commands = new CommandPool(
$this->client,
$this->getUploadCommands($resultHandler),
[
'concurrency' => $this->config['concurrency'],
'before' => $this->config['before_upload'],
]
);
// Execute the pool of commands concurrently, and process errors.
yield $commands->promise();
if ($errors) {
throw new MultipartUploadException($this->state, $errors);
}
// Complete the multipart upload.
yield $this->execCommand('complete', $this->getCompleteParams());
$this->state->setStatus(UploadState::COMPLETED);
})->otherwise(function (\Exception $e) {
// Throw errors from the operations as a specific Multipart error.
if ($e instanceof AwsException) {
$e = new MultipartUploadException($this->state, $e);
}
throw $e;
});
}
protected function getConfig()
{
return $this->config;
}
/**
* Provides service-specific information about the multipart upload
* workflow.
*
* This array of data should include the keys: 'command', 'id', and 'part_num'.
*
* @return array
*/
abstract protected function loadUploadWorkflowInfo();
/**
* Determines the part size to use for upload parts.
*
* Examines the provided partSize value and the source to determine the
* best possible part size.
*
* @throws \InvalidArgumentException if the part size is invalid.
*
* @return int
*/
abstract protected function determinePartSize();
/**
* Uses information from the Command and Result to determine which part was
* uploaded and mark it as uploaded in the upload's state.
*
* @param CommandInterface $command
* @param ResultInterface $result
*/
abstract protected function handleResult(
CommandInterface $command,
ResultInterface $result
);
/**
* Gets the service-specific parameters used to initiate the upload.
*
* @return array
*/
abstract protected function getInitiateParams();
/**
* Gets the service-specific parameters used to complete the upload.
*
* @return array
*/
abstract protected function getCompleteParams();
/**
* Based on the config and service-specific workflow info, creates a
* `Promise` for an `UploadState` object.
*
* @return PromiseInterface A `Promise` that resolves to an `UploadState`.
*/
private function determineState()
{
// If the state was provided via config, then just use it.
if ($this->config['state'] instanceof UploadState) {
return $this->config['state'];
}
// Otherwise, construct a new state from the provided identifiers.
$required = $this->info['id'];
$id = [$required['upload_id'] => null];
unset($required['upload_id']);
foreach ($required as $key => $param) {
if (!$this->config[$key]) {
throw new IAE('You must provide a value for "' . $key . '" in '
. 'your config for the MultipartUploader for '
. $this->client->getApi()->getServiceFullName() . '.');
}
$id[$param] = $this->config[$key];
}
$state = new UploadState($id);
$state->setPartSize($this->determinePartSize());
return $state;
}
/**
* Executes a MUP command with all of the parameters for the operation.
*
* @param string $operation Name of the operation.
* @param array $params Service-specific params for the operation.
*
* @return PromiseInterface
*/
private function execCommand($operation, array $params)
{
// Create the command.
$command = $this->client->getCommand(
$this->info['command'][$operation],
$params + $this->state->getId()
);
// Execute the before callback.
if (is_callable($this->config["before_{$operation}"])) {
$this->config["before_{$operation}"]($command);
}
// Execute the command asynchronously and return the promise.
return $this->client->executeAsync($command);
}
/**
* Returns a middleware for processing responses of part upload operations.
*
* - Adds an onFulfilled callback that calls the service-specific
* handleResult method on the Result of the operation.
* - Adds an onRejected callback that adds the error to an array of errors.
* - Has a passedByRef $errors arg that the exceptions get added to. The
* caller should use that &$errors array to do error handling.
*
* @param array $errors Errors from upload operations are added to this.
*
* @return callable
*/
private function getResultHandler(&$errors = [])
{
return function (callable $handler) use (&$errors) {
return function (
CommandInterface $command,
RequestInterface $request = null
) use ($handler, &$errors) {
return $handler($command, $request)->then(
function (ResultInterface $result) use ($command) {
$this->handleResult($command, $result);
return $result;
},
function (AwsException $e) use (&$errors) {
$errors[$e->getCommand()[$this->info['part_num']]] = $e;
return new Result();
}
);
};
};
}
/**
* Creates a generator that yields part data for the upload's source.
*
* Yields associative arrays of parameters that are ultimately merged in
* with others to form the complete parameters of a command. This can
* include the Body parameter, which is a limited stream (i.e., a Stream
* object, decorated with a LimitStream).
*
* @param callable $resultHandler
*
* @return \Generator
*/
abstract protected function getUploadCommands(callable $resultHandler);
}
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