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1 files changed, 277 insertions, 0 deletions

diff --git a/vendor/aws/aws-sdk-php/src/RetryMiddleware.php b/vendor/aws/aws-sdk-php/src/RetryMiddleware.php
new file mode 100644
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--- /dev/null
+++ b/vendor/aws/aws-sdk-php/src/RetryMiddleware.php
@@ -0,0 +1,277 @@
+<?php
+namespace Aws;
+
+use Aws\Exception\AwsException;
+use Aws\Retry\RetryHelperTrait;
+use GuzzleHttp\Exception\RequestException;
+use Psr\Http\Message\RequestInterface;
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Promise;
+
+/**
+ * Middleware that retries failures. V1 implemention that supports 'legacy' mode.
+ *
+ * @internal
+ */
+class RetryMiddleware
+{
+    use RetryHelperTrait;
+
+    private static $retryStatusCodes = [
+        500 => true,
+        502 => true,
+        503 => true,
+        504 => true
+    ];
+
+    private static $retryCodes = [
+        // Throttling error
+        'RequestLimitExceeded'                   => true,
+        'Throttling'                             => true,
+        'ThrottlingException'                    => true,
+        'ThrottledException'                     => true,
+        'ProvisionedThroughputExceededException' => true,
+        'RequestThrottled'                       => true,
+        'BandwidthLimitExceeded'                 => true,
+        'RequestThrottledException'              => true,
+        'TooManyRequestsException'               => true,
+        'IDPCommunicationError'                  => true,
+        'EC2ThrottledException'                  => true,
+    ];
+
+    private $decider;
+    private $delay;
+    private $nextHandler;
+    private $collectStats;
+
+    public function __construct(
+        callable $decider,
+        callable $delay,
+        callable $nextHandler,
+        $collectStats = false
+    ) {
+        $this->decider = $decider;
+        $this->delay = $delay;
+        $this->nextHandler = $nextHandler;
+        $this->collectStats = (bool) $collectStats;
+    }
+
+    /**
+     * Creates a default AWS retry decider function.
+     *
+     * The optional $extraConfig parameter is an associative array
+     * that specifies additional retry conditions on top of the ones specified
+     * by default by the Aws\RetryMiddleware class, with the following keys:
+     *
+     * - errorCodes: (string[]) An indexed array of AWS exception codes to retry.
+     *   Optional.
+     * - statusCodes: (int[]) An indexed array of HTTP status codes to retry.
+     *   Optional.
+     * - curlErrors: (int[]) An indexed array of Curl error codes to retry. Note
+     *   these should be valid Curl constants. Optional.
+     *
+     * @param int $maxRetries
+     * @param array $extraConfig
+     * @return callable
+     */
+    public static function createDefaultDecider(
+        $maxRetries = 3,
+        $extraConfig = []
+    ) {
+        $retryCurlErrors = [];
+        if (extension_loaded('curl')) {
+            $retryCurlErrors[CURLE_RECV_ERROR] = true;
+        }
+
+        return function (
+            $retries,
+            CommandInterface $command,
+            RequestInterface $request,
+            ResultInterface $result = null,
+            $error = null
+        ) use ($maxRetries, $retryCurlErrors, $extraConfig) {
+            // Allow command-level options to override this value
+            $maxRetries = null !== $command['@retries'] ?
+                $command['@retries']
+                : $maxRetries;
+
+            $isRetryable = self::isRetryable(
+                $result,
+                $error,
+                $retryCurlErrors,
+                $extraConfig
+            );
+
+            if ($retries >= $maxRetries) {
+                if (!empty($error)
+                    && $error instanceof AwsException
+                    && $isRetryable
+                ) {
+                    $error->setMaxRetriesExceeded();
+                }
+                return false;
+            }
+
+            return $isRetryable;
+        };
+    }
+
+    private static function isRetryable(
+        $result,
+        $error,
+        $retryCurlErrors,
+        $extraConfig = []
+    ) {
+        $errorCodes = self::$retryCodes;
+        if (!empty($extraConfig['error_codes'])
+            && is_array($extraConfig['error_codes'])
+        ) {
+            foreach($extraConfig['error_codes'] as $code) {
+                $errorCodes[$code] = true;
+            }
+        }
+
+        $statusCodes = self::$retryStatusCodes;
+        if (!empty($extraConfig['status_codes'])
+            && is_array($extraConfig['status_codes'])
+        ) {
+            foreach($extraConfig['status_codes'] as $code) {
+                $statusCodes[$code] = true;
+            }
+        }
+
+        if (!empty($extraConfig['curl_errors'])
+            && is_array($extraConfig['curl_errors'])
+        ) {
+            foreach($extraConfig['curl_errors'] as $code) {
+                $retryCurlErrors[$code] = true;
+            }
+        }
+
+        if (!$error) {
+            if (!isset($result['@metadata']['statusCode'])) {
+                return false;
+            }
+            return isset($statusCodes[$result['@metadata']['statusCode']]);
+        }
+
+        if (!($error instanceof AwsException)) {
+            return false;
+        }
+
+        if ($error->isConnectionError()) {
+            return true;
+        }
+
+        if (isset($errorCodes[$error->getAwsErrorCode()])) {
+            return true;
+        }
+
+        if (isset($statusCodes[$error->getStatusCode()])) {
+            return true;
+        }
+
+        if (count($retryCurlErrors)
+            && ($previous = $error->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;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Delay function that calculates an exponential delay.
+     *
+     * Exponential backoff with jitter, 100ms base, 20 sec ceiling
+     *
+     * @param $retries - The number of retries that have already been attempted
+     *
+     * @return int
+     *
+     * @link https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/
+     */
+    public static function exponentialDelay($retries)
+    {
+        return mt_rand(0, (int) min(20000, (int) pow(2, $retries) * 100));
+    }
+
+    /**
+     * @param CommandInterface $command
+     * @param RequestInterface $request
+     *
+     * @return PromiseInterface
+     */
+    public function __invoke(
+        CommandInterface $command,
+        RequestInterface $request = null
+    ) {
+        $retries = 0;
+        $requestStats = [];
+        $monitoringEvents = [];
+        $handler = $this->nextHandler;
+        $decider = $this->decider;
+        $delay = $this->delay;
+
+        $request = $this->addRetryHeader($request, 0, 0);
+
+        $g = function ($value) use (
+            $handler,
+            $decider,
+            $delay,
+            $command,
+            $request,
+            &$retries,
+            &$requestStats,
+            &$monitoringEvents,
+            &$g
+        ) {
+            $this->updateHttpStats($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($retries, $command, $request, null, $value)) {
+                    return Promise\Create::rejectionFor(
+                        $this->bindStatsToReturn($value, $requestStats)
+                    );
+                }
+            } elseif ($value instanceof ResultInterface
+                && !$decider($retries, $command, $request, $value, null)
+            ) {
+                return $this->bindStatsToReturn($value, $requestStats);
+            }
+
+            // Delay fn is called with 0, 1, ... so increment after the call.
+            $delayBy = $delay($retries++);
+            $command['@http']['delay'] = $delayBy;
+            if ($this->collectStats) {
+                $this->updateStats($retries, $delayBy, $requestStats);
+            }
+
+            // Update retry header with retry count and delayBy
+            $request = $this->addRetryHeader($request, $retries, $delayBy);
+
+            return $handler($command, $request)->then($g, $g);
+        };
+
+        return $handler($command, $request)->then($g, $g);
+    }
+}