|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace RateLimit; |
|
6
|
|
|
|
|
7
|
|
|
use RateLimit\Exception\CannotUseRateLimiter; |
|
8
|
|
|
use RateLimit\Exception\LimitExceeded; |
|
9
|
|
|
|
|
10
|
|
|
final class ApcuRateLimiter implements RateLimiter, SilentRateLimiter |
|
11
|
|
|
{ |
|
12
|
|
|
/** @var string */ |
|
13
|
|
|
private $keyPrefix; |
|
14
|
|
|
|
|
15
|
5 |
|
public function __construct(string $keyPrefix = '') |
|
16
|
|
|
{ |
|
17
|
5 |
|
if (!\extension_loaded('apcu') || \ini_get('apc.enabled') === '0') { |
|
18
|
|
|
throw new CannotUseRateLimiter('APCu extension is not loaded or not enabled.'); |
|
19
|
|
|
} |
|
20
|
|
|
|
|
21
|
5 |
|
if (\ini_get('apc.use_request_time') === '1') { |
|
22
|
|
|
throw new CannotUseRateLimiter('APCu ini configuration "apc.use_request_time" should be set to "0".'); |
|
23
|
|
|
} |
|
24
|
|
|
|
|
25
|
5 |
|
$this->keyPrefix = $keyPrefix; |
|
26
|
5 |
|
} |
|
27
|
|
|
|
|
28
|
2 |
|
public function limit(string $identifier, Rate $rate): void |
|
29
|
|
|
{ |
|
30
|
2 |
|
$interval = $rate->getInterval(); |
|
31
|
2 |
|
$valueKey = $this->valueKey($identifier, $interval); |
|
32
|
2 |
|
$timeKey = $this->timeKey($identifier, $interval); |
|
33
|
|
|
|
|
34
|
2 |
|
$current = $this->getCurrent($valueKey); |
|
35
|
2 |
|
if ($current >= $rate->getOperations()) { |
|
36
|
2 |
|
throw LimitExceeded::for($identifier, $rate); |
|
37
|
|
|
} |
|
38
|
|
|
|
|
39
|
2 |
|
$this->updateCounter($valueKey, $timeKey, $rate->getInterval()); |
|
40
|
2 |
|
} |
|
41
|
|
|
|
|
42
|
3 |
|
public function limitSilently(string $identifier, Rate $rate): Status |
|
43
|
|
|
{ |
|
44
|
3 |
|
$interval = $rate->getInterval(); |
|
45
|
3 |
|
$valueKey = $this->valueKey($identifier, $interval); |
|
46
|
3 |
|
$timeKey = $this->timeKey($identifier, $interval); |
|
47
|
|
|
|
|
48
|
3 |
|
$current = $this->getCurrent($valueKey); |
|
49
|
3 |
|
if ($current <= $rate->getOperations()) { |
|
50
|
3 |
|
$current = $this->updateCounter($valueKey, $timeKey, $interval); |
|
51
|
|
|
} |
|
52
|
|
|
|
|
53
|
3 |
|
return Status::from( |
|
54
|
3 |
|
\sprintf('%s%s', $this->keyPrefix, $identifier), |
|
55
|
3 |
|
$current, |
|
56
|
3 |
|
$rate->getOperations(), |
|
57
|
3 |
|
\time() + \max(0, $interval - $this->getElapsedTime($timeKey)) |
|
58
|
|
|
); |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
5 |
|
private function valueKey(string $identifier, int $interval): string |
|
62
|
|
|
{ |
|
63
|
5 |
|
return "{$this->keyPrefix}{$identifier}:value:$interval"; |
|
64
|
|
|
} |
|
65
|
|
|
|
|
66
|
5 |
|
private function timeKey(string $identifier, int $interval): string |
|
67
|
|
|
{ |
|
68
|
5 |
|
return "{$this->keyPrefix}{$identifier}:time:$interval"; |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
5 |
|
private function getCurrent(string $valueKey): int |
|
72
|
|
|
{ |
|
73
|
5 |
|
return (int) \apcu_fetch($valueKey); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
5 |
|
private function updateCounter(string $valueKey, string $timeKey, int $interval): int |
|
77
|
|
|
{ |
|
78
|
5 |
|
$current = \apcu_inc($valueKey, 1, $success, $interval); |
|
79
|
|
|
|
|
80
|
5 |
|
if ($current === 1) { |
|
81
|
5 |
|
\apcu_store($timeKey, \time(), $interval); |
|
82
|
|
|
} |
|
83
|
|
|
|
|
84
|
5 |
|
return $current === false ? 1 : $current; |
|
85
|
|
|
} |
|
86
|
|
|
|
|
87
|
3 |
|
protected function getElapsedTime(string $timeKey): int |
|
88
|
|
|
{ |
|
89
|
3 |
|
return \time() - (int) \apcu_fetch($timeKey); |
|
90
|
|
|
} |
|
91
|
|
|
} |
|
92
|
|
|
|
nikolaposa /
rate-limit
