depicter / modules / GuzzleHttp / RetryMiddleware.php

RetryMiddleware.php in Depicter — Popup & Slider Builder 1.9.6, at modules/GuzzleHttp/RetryMiddleware.php

117 lines 3.6 KB

Raw Download Zip

1	<?php
2
3	namespace Depicter\GuzzleHttp;
4
5	use Depicter\GuzzleHttp\Promise as P;
6	use Depicter\GuzzleHttp\Promise\PromiseInterface;
7	use Depicter\Psr\Http\Message\RequestInterface;
8	use Depicter\Psr\Http\Message\ResponseInterface;
9
10	/**
11	* Middleware that retries requests based on the boolean result of
12	* invoking the provided "decider" function.
13	*
14	* @final
15	*/
16	class RetryMiddleware
17	{
18	/**
19	* @var callable(RequestInterface, array): PromiseInterface
20	*/
21	private $nextHandler;
22
23	/**
24	* @var callable
25	*/
26	private $decider;
27
28	/**
29	* @var callable(int)
30	*/
31	private $delay;
32
33	/**
34	* @param callable $decider Function that accepts the number of retries,
35	* a request, [response], and [exception] and
36	* returns true if the request is to be
37	* retried.
38	* @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
39	* @param (callable(int): int)\|null $delay Function that accepts the number of retries
40	* and returns the number of
41	* milliseconds to delay.
42	*/
43	public function __construct(callable $decider, callable $nextHandler, callable $delay = null)
44	{
45	$this->decider = $decider;
46	$this->nextHandler = $nextHandler;
47	$this->delay = $delay ?: __CLASS__ . '::exponentialDelay';
48	}
49
50	/**
51	* Default exponential backoff delay function.
52	*
53	* @return int milliseconds.
54	*/
55	public static function exponentialDelay(int $retries): int
56	{
57	return (int) \pow(2, $retries - 1) * 1000;
58	}
59
60	public function __invoke(RequestInterface $request, array $options): PromiseInterface
61	{
62	if (!isset($options['retries'])) {
63	$options['retries'] = 0;
64	}
65
66	$fn = $this->nextHandler;
67	return $fn($request, $options)
68	->then(
69	$this->onFulfilled($request, $options),
70	$this->onRejected($request, $options)
71	);
72	}
73
74	/**
75	* Execute fulfilled closure
76	*/
77	private function onFulfilled(RequestInterface $request, array $options): callable
78	{
79	return function ($value) use ($request, $options) {
80	if (!($this->decider)(
81	$options['retries'],
82	$request,
83	$value,
84	null
85	)) {
86	return $value;
87	}
88	return $this->doRetry($request, $options, $value);
89	};
90	}
91
92	/**
93	* Execute rejected closure
94	*/
95	private function onRejected(RequestInterface $req, array $options): callable
96	{
97	return function ($reason) use ($req, $options) {
98	if (!($this->decider)(
99	$options['retries'],
100	$req,
101	null,
102	$reason
103	)) {
104	return P\Create::rejectionFor($reason);
105	}
106	return $this->doRetry($req, $options);
107	};
108	}
109
110	private function doRetry(RequestInterface $request, array $options, ResponseInterface $response = null): PromiseInterface
111	{
112	$options['delay'] = ($this->delay)(++$options['retries'], $response);
113
114	return $this($request, $options);
115	}
116	}
117