仓库初始化

addons/epay/library/hyperf/utils/src/Backoff.php

@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://www.hyperf.io
+ * @document https://hyperf.wiki
+ * @contact  group@hyperf.io
+ * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
+ */
+namespace Hyperf\Utils;
+
+class Backoff
+{
+    /**
+     * Max backoff.
+     */
+    private const CAP = 60 * 1000; // 1 minute
+
+    /**
+     * @var int
+     */
+    private $firstMs;
+
+    /**
+     * Backoff interval.
+     * @var int
+     */
+    private $currentMs;
+
+    /**
+     * @param int the first backoff in milliseconds
+     */
+    public function __construct(int $firstMs = 0)
+    {
+        if ($firstMs < 0) {
+            throw new \InvalidArgumentException(
+                'first backoff interval must be greater or equal than 0'
+            );
+        }
+
+        if ($firstMs > Backoff::CAP) {
+            throw new \InvalidArgumentException(
+                sprintf(
+                    'first backoff interval must be less or equal than %d milliseconds',
+                    self::CAP
+                )
+            );
+        }
+
+        $this->firstMs = $firstMs;
+        $this->currentMs = $firstMs;
+    }
+
+    /**
+     * Sleep until the next execution.
+     */
+    public function sleep(): void
+    {
+        if ($this->currentMs === 0) {
+            return;
+        }
+
+        usleep($this->currentMs * 1000);
+
+        // update backoff using Decorrelated Jitter
+        // see: https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/
+        $this->currentMs = rand($this->firstMs, $this->currentMs * 3);
+
+        if ($this->currentMs > self::CAP) {
+            $this->currentMs = self::CAP;
+        }
+    }
+
+    /**
+     * Get the next backoff for logging, etc.
+     * @return int next backoff
+     */
+    public function nextBackoff(): int
+    {
+        return $this->currentMs;
+    }
+}