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Mini Shell
<?php
namespace Aws;
use Aws\Exception\AwsException;
use Aws\Retry\ConfigurationInterface;
use Aws\Retry\QuotaManager;
use Aws\Retry\RateLimiter;
use Aws\Retry\RetryHelperTrait;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Promise;
use Psr\Http\Message\RequestInterface;
/**
* Middleware that retries failures. V2 implementation that supports 'standard'
* and 'adaptive' modes.
*
* @internal
*/
class RetryMiddlewareV2
{
use RetryHelperTrait;
private static $standardThrottlingErrors = [
'Throttling' => true,
'ThrottlingException' => true,
'ThrottledException' => true,
'RequestThrottledException' => true,
'TooManyRequestsException' => true,
'ProvisionedThroughputExceededException' => true,
'TransactionInProgressException' => true,
'RequestLimitExceeded' => true,
'BandwidthLimitExceeded' => true,
'LimitExceededException' => true,
'RequestThrottled' => true,
'SlowDown' => true,
'PriorRequestNotComplete' => true,
'EC2ThrottledException' => true,
];
private static $standardTransientErrors = [
'RequestTimeout' => true,
'RequestTimeoutException' => true,
];
private static $standardTransientStatusCodes = [
500 => true,
502 => true,
503 => true,
504 => true,
];
private $collectStats;
private $decider;
private $delayer;
private $maxAttempts;
private $maxBackoff;
private $mode;
private $nextHandler;
private $options;
private $quotaManager;
private $rateLimiter;
public static function wrap($config, $options)
{
return function (callable $handler) use (
$config,
$options
) {
return new static(
$config,
$handler,
$options
);
};
}
public static function createDefaultDecider(
QuotaManager $quotaManager,
$maxAttempts = 3,
$options = []
) {
$retryCurlErrors = [];
if (extension_loaded('curl')) {
$retryCurlErrors[CURLE_RECV_ERROR] = true;
}
return function(
$attempts,
CommandInterface $command,
$result
) use ($options, $quotaManager, $retryCurlErrors, $maxAttempts) {
// Release retry tokens back to quota on a successful result
$quotaManager->releaseToQuota($result);
// Allow command-level option to override this value
// # of attempts = # of retries + 1
$maxAttempts = (null !== $command['@retries'])
? $command['@retries'] + 1
: $maxAttempts;
$isRetryable = self::isRetryable(
$result,
$retryCurlErrors,
$options
);
if ($isRetryable) {
// Retrieve retry tokens and check if quota has been exceeded
if (!$quotaManager->hasRetryQuota($result)) {
return false;
}
if ($attempts >= $maxAttempts) {
if (!empty($result) && $result instanceof AwsException) {
$result->setMaxRetriesExceeded();
}
return false;
}
}
return $isRetryable;
};
}
public function __construct(
ConfigurationInterface $config,
callable $handler,
$options = []
) {
$this->options = $options;
$this->maxAttempts = $config->getMaxAttempts();
$this->mode = $config->getMode();
$this->nextHandler = $handler;
$this->quotaManager = new QuotaManager();
$this->maxBackoff = isset($options['max_backoff'])
? $options['max_backoff']
: 20000;
$this->collectStats = isset($options['collect_stats'])
? (bool) $options['collect_stats']
: false;
$this->decider = isset($options['decider'])
? $options['decider']
: self::createDefaultDecider(
$this->quotaManager,
$this->maxAttempts,
$options
);
$this->delayer = isset($options['delayer'])
? $options['delayer']
: function ($attempts) {
return $this->exponentialDelayWithJitter($attempts);
};
if ($this->mode === 'adaptive') {
$this->rateLimiter = isset($options['rate_limiter'])
? $options['rate_limiter']
: new RateLimiter();
}
}
public function __invoke(CommandInterface $cmd, RequestInterface $req)
{
$decider = $this->decider;
$delayer = $this->delayer;
$handler = $this->nextHandler;
$attempts = 1;
$monitoringEvents = [];
$requestStats = [];
$req = $this->addRetryHeader($req, 0, 0);
$callback = function ($value) use (
$handler,
$cmd,
$req,
$decider,
$delayer,
&$attempts,
&$requestStats,
&$monitoringEvents,
&$callback
) {
if ($this->mode === 'adaptive') {
$this->rateLimiter->updateSendingRate($this->isThrottlingError($value));
}
$this->updateHttpStats($value, $requestStats);
if ($value instanceof MonitoringEventsInterface) {
$reversedEvents = array_reverse($monitoringEvents);
$monitoringEvents = array_merge($monitoringEvents, $value->getMonitoringEvents());
foreach ($reversedEvents as $event) {
$value->prependMonitoringEvent($event);
}
}
if ($value instanceof \Exception || $value instanceof \Throwable) {
if (!$decider($attempts, $cmd, $value)) {
return Promise\Create::rejectionFor(
$this->bindStatsToReturn($value, $requestStats)
);
}
} elseif ($value instanceof ResultInterface
&& !$decider($attempts, $cmd, $value)
) {
return $this->bindStatsToReturn($value, $requestStats);
}
$delayBy = $delayer($attempts++);
$cmd['@http']['delay'] = $delayBy;
if ($this->collectStats) {
$this->updateStats($attempts - 1, $delayBy, $requestStats);
}
// Update retry header with retry count and delayBy
$req = $this->addRetryHeader($req, $attempts - 1, $delayBy);
// Get token from rate limiter, which will sleep if necessary
if ($this->mode === 'adaptive') {
$this->rateLimiter->getSendToken();
}
return $handler($cmd, $req)->then($callback, $callback);
};
// Get token from rate limiter, which will sleep if necessary
if ($this->mode === 'adaptive') {
$this->rateLimiter->getSendToken();
}
return $handler($cmd, $req)->then($callback, $callback);
}
/**
* Amount of milliseconds to delay as a function of attempt number
*
* @param $attempts
* @return mixed
*/
public function exponentialDelayWithJitter($attempts)
{
$rand = mt_rand() / mt_getrandmax();
return min(1000 * $rand * pow(2, $attempts) , $this->maxBackoff);
}
private static function isRetryable(
$result,
$retryCurlErrors,
$options = []
) {
$errorCodes = self::$standardThrottlingErrors + self::$standardTransientErrors;
if (!empty($options['transient_error_codes'])
&& is_array($options['transient_error_codes'])
) {
foreach($options['transient_error_codes'] as $code) {
$errorCodes[$code] = true;
}
}
if (!empty($options['throttling_error_codes'])
&& is_array($options['throttling_error_codes'])
) {
foreach($options['throttling_error_codes'] as $code) {
$errorCodes[$code] = true;
}
}
$statusCodes = self::$standardTransientStatusCodes;
if (!empty($options['status_codes'])
&& is_array($options['status_codes'])
) {
foreach($options['status_codes'] as $code) {
$statusCodes[$code] = true;
}
}
if (!empty($options['curl_errors'])
&& is_array($options['curl_errors'])
) {
foreach($options['curl_errors'] as $code) {
$retryCurlErrors[$code] = true;
}
}
if ($result instanceof \Exception || $result instanceof \Throwable) {
$isError = true;
} else {
$isError = false;
}
if (!$isError) {
if (!isset($result['@metadata']['statusCode'])) {
return false;
}
return isset($statusCodes[$result['@metadata']['statusCode']]);
}
if (!($result instanceof AwsException)) {
return false;
}
if ($result->isConnectionError()) {
return true;
}
if (!empty($errorCodes[$result->getAwsErrorCode()])) {
return true;
}
if (!empty($statusCodes[$result->getStatusCode()])) {
return true;
}
if (count($retryCurlErrors)
&& ($previous = $result->getPrevious())
&& $previous instanceof RequestException
) {
if (method_exists($previous, 'getHandlerContext')) {
$context = $previous->getHandlerContext();
return !empty($context['errno'])
&& isset($retryCurlErrors[$context['errno']]);
}
$message = $previous->getMessage();
foreach (array_keys($retryCurlErrors) as $curlError) {
if (strpos($message, 'cURL error ' . $curlError . ':') === 0) {
return true;
}
}
}
// Check error shape for the retryable trait
if (!empty($errorShape = $result->getAwsErrorShape())) {
$definition = $errorShape->toArray();
if (!empty($definition['retryable'])) {
return true;
}
}
return false;
}
private function isThrottlingError($result)
{
if ($result instanceof AwsException) {
// Check pre-defined throttling errors
$throttlingErrors = self::$standardThrottlingErrors;
if (!empty($this->options['throttling_error_codes'])
&& is_array($this->options['throttling_error_codes'])
) {
foreach($this->options['throttling_error_codes'] as $code) {
$throttlingErrors[$code] = true;
}
}
if (!empty($result->getAwsErrorCode())
&& !empty($throttlingErrors[$result->getAwsErrorCode()])
) {
return true;
}
// Check error shape for the throttling trait
if (!empty($errorShape = $result->getAwsErrorShape())) {
$definition = $errorShape->toArray();
if (!empty($definition['retryable']['throttling'])) {
return true;
}
}
}
return false;
}
}
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