v2: Updates

* Simplifies & beautifies everything
* Introduces a new Class system.
* Errors are defaulted to AWS's handler.
* New function names & more efficient handling.
* Should fix a majority of the errors.

Please read the README for more!

aws/Aws/Retry/RetryHelperTrait.php

@@ -0,0 +1,56 @@
+<?php
+namespace Aws\Retry;
+
+use Aws\Exception\AwsException;
+use Aws\ResultInterface;
+
+trait RetryHelperTrait
+{
+    private function addRetryHeader($request, $retries, $delayBy)
+    {
+        return $request->withHeader('aws-sdk-retry', "{$retries}/{$delayBy}");
+    }
+
+
+    private function updateStats($retries, $delay, array &$stats)
+    {
+        if (!isset($stats['total_retry_delay'])) {
+            $stats['total_retry_delay'] = 0;
+        }
+
+        $stats['total_retry_delay'] += $delay;
+        $stats['retries_attempted'] = $retries;
+    }
+
+    private function updateHttpStats($value, array &$stats)
+    {
+        if (empty($stats['http'])) {
+            $stats['http'] = [];
+        }
+
+        if ($value instanceof AwsException) {
+            $resultStats = $value->getTransferInfo();
+            $stats['http'] []= $resultStats;
+        } elseif ($value instanceof ResultInterface) {
+            $resultStats = isset($value['@metadata']['transferStats']['http'][0])
+                ? $value['@metadata']['transferStats']['http'][0]
+                : [];
+            $stats['http'] []= $resultStats;
+        }
+    }
+
+    private function bindStatsToReturn($return, array $stats)
+    {
+        if ($return instanceof ResultInterface) {
+            if (!isset($return['@metadata'])) {
+                $return['@metadata'] = [];
+            }
+
+            $return['@metadata']['transferStats'] = $stats;
+        } elseif ($return instanceof AwsException) {
+            $return->setTransferInfo($stats);
+        }
+
+        return $return;
+    }
+}