|
1
|
|
|
<?php |
|
2
|
|
|
namespace Ackintosh\Ganesha\Strategy; |
|
3
|
|
|
|
|
4
|
|
|
use Ackintosh\Ganesha; |
|
5
|
|
|
use Ackintosh\Ganesha\Configuration; |
|
6
|
|
|
use Ackintosh\Ganesha\Exception\StorageException; |
|
7
|
|
|
use Ackintosh\Ganesha\Storage; |
|
8
|
|
|
use Ackintosh\Ganesha\StrategyInterface; |
|
9
|
|
|
use InvalidArgumentException; |
|
10
|
|
|
use LogicException; |
|
11
|
|
|
|
|
12
|
|
|
class Count implements StrategyInterface |
|
13
|
|
|
{ |
|
14
|
|
|
/** |
|
15
|
|
|
* @var Configuration |
|
16
|
|
|
*/ |
|
17
|
|
|
private $configuration; |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* @var Storage |
|
21
|
|
|
*/ |
|
22
|
|
|
private $storage; |
|
23
|
|
|
|
|
24
|
|
|
/** |
|
25
|
|
|
* @var array |
|
26
|
|
|
*/ |
|
27
|
|
|
private static $requirements = [ |
|
28
|
|
|
'adapter', |
|
29
|
|
|
'failureCountThreshold', |
|
30
|
|
|
'intervalToHalfOpen', |
|
31
|
|
|
]; |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* @param Configuration $configuration |
|
35
|
|
|
* @param Storage $storage |
|
36
|
|
|
*/ |
|
37
|
|
|
private function __construct(Configuration $configuration, Storage $storage) |
|
38
|
|
|
{ |
|
39
|
|
|
$this->configuration = $configuration; |
|
40
|
|
|
$this->storage = $storage; |
|
41
|
|
|
} |
|
42
|
|
|
|
|
43
|
|
|
/** |
|
44
|
|
|
* @param array $params |
|
45
|
|
|
* @throws LogicException |
|
46
|
|
|
*/ |
|
47
|
|
|
public static function validate(array $params): void |
|
48
|
|
|
{ |
|
49
|
|
|
foreach (self::$requirements as $r) { |
|
50
|
|
|
if (!isset($params[$r])) { |
|
51
|
|
|
throw new LogicException($r . ' is required'); |
|
52
|
|
|
} |
|
53
|
|
|
} |
|
54
|
|
|
|
|
55
|
|
|
if (!call_user_func([$params['adapter'], 'supportCountStrategy'])) { |
|
56
|
|
|
throw new InvalidArgumentException(get_class($params['adapter']) . " doesn't support Count Strategy."); |
|
57
|
|
|
} |
|
58
|
|
|
} |
|
59
|
|
|
|
|
60
|
|
|
/** |
|
61
|
|
|
* @param Configuration $configuration |
|
62
|
|
|
* @return Count |
|
63
|
|
|
*/ |
|
64
|
|
|
public static function create(Configuration $configuration): StrategyInterface |
|
65
|
|
|
{ |
|
66
|
|
|
return new self( |
|
67
|
|
|
$configuration, |
|
68
|
|
|
new Storage( |
|
69
|
|
|
$configuration['adapter'], |
|
|
|
|
|
|
70
|
|
|
$configuration['storageKeys'], |
|
|
|
|
|
|
71
|
|
|
null |
|
72
|
|
|
) |
|
73
|
|
|
); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
/** |
|
77
|
|
|
* @param string $service |
|
78
|
|
|
* @return int |
|
79
|
|
|
*/ |
|
80
|
|
|
public function recordFailure(string $service): int |
|
81
|
|
|
{ |
|
82
|
|
|
$this->storage->setLastFailureTime($service, time()); |
|
83
|
|
|
$this->storage->incrementFailureCount($service); |
|
84
|
|
|
|
|
85
|
|
|
if ($this->storage->getFailureCount($service) >= $this->configuration['failureCountThreshold'] |
|
86
|
|
|
&& $this->storage->getStatus($service) === Ganesha::STATUS_CALMED_DOWN |
|
87
|
|
|
) { |
|
88
|
|
|
$this->storage->setStatus($service, Ganesha::STATUS_TRIPPED); |
|
89
|
|
|
return Ganesha::STATUS_TRIPPED; |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
|
|
return Ganesha::STATUS_CALMED_DOWN; |
|
93
|
|
|
} |
|
94
|
|
|
|
|
95
|
|
|
/** |
|
96
|
|
|
* @param string $service |
|
97
|
|
|
* @return int |
|
98
|
|
|
*/ |
|
99
|
|
|
public function recordSuccess(string $service): ?int |
|
100
|
|
|
{ |
|
101
|
|
|
$this->storage->decrementFailureCount($service); |
|
102
|
|
|
|
|
103
|
|
|
$status = $this->storage->getStatus($service); |
|
104
|
|
|
if ($this->storage->getFailureCount($service) === 0 |
|
105
|
|
|
&& $status === Ganesha::STATUS_TRIPPED |
|
106
|
|
|
) { |
|
107
|
|
|
$this->storage->setStatus($service, Ganesha::STATUS_CALMED_DOWN); |
|
108
|
|
|
return Ganesha::STATUS_CALMED_DOWN; |
|
109
|
|
|
} |
|
110
|
|
|
|
|
111
|
|
|
return null; |
|
112
|
|
|
} |
|
113
|
|
|
|
|
114
|
|
|
/** |
|
115
|
|
|
* @return void |
|
116
|
|
|
*/ |
|
117
|
|
|
public function reset(): void |
|
118
|
|
|
{ |
|
119
|
|
|
$this->storage->reset(); |
|
120
|
|
|
} |
|
121
|
|
|
|
|
122
|
|
|
/** |
|
123
|
|
|
* @param string $service |
|
124
|
|
|
* @return bool |
|
125
|
|
|
*/ |
|
126
|
|
|
public function isAvailable(string $service): bool |
|
127
|
|
|
{ |
|
128
|
|
|
return $this->isClosed($service) || $this->isHalfOpen($service); |
|
129
|
|
|
} |
|
130
|
|
|
|
|
131
|
|
|
/** |
|
132
|
|
|
* @param string $service |
|
133
|
|
|
* @return bool |
|
134
|
|
|
* @throws StorageException |
|
135
|
|
|
*/ |
|
136
|
|
|
private function isClosed(string $service): bool |
|
137
|
|
|
{ |
|
138
|
|
|
return $this->storage->getFailureCount($service) < $this->configuration['failureCountThreshold']; |
|
139
|
|
|
} |
|
140
|
|
|
|
|
141
|
|
|
/** |
|
142
|
|
|
* @param string $service |
|
143
|
|
|
* @return bool |
|
144
|
|
|
* @throws StorageException |
|
145
|
|
|
*/ |
|
146
|
|
|
private function isHalfOpen(string $service): bool |
|
147
|
|
|
{ |
|
148
|
|
|
if (is_null($lastFailureTime = $this->storage->getLastFailureTime($service))) { |
|
149
|
|
|
return false; |
|
150
|
|
|
} |
|
151
|
|
|
|
|
152
|
|
|
if ((time() - $lastFailureTime) > $this->configuration['intervalToHalfOpen']) { |
|
153
|
|
|
$this->storage->setFailureCount($service, $this->configuration['failureCountThreshold']); |
|
|
|
|
|
|
154
|
|
|
$this->storage->setLastFailureTime($service, time()); |
|
155
|
|
|
return true; |
|
156
|
|
|
} |
|
157
|
|
|
|
|
158
|
|
|
return false; |
|
159
|
|
|
} |
|
160
|
|
|
} |
|
161
|
|
|
|
ackintosh /
ganesha
Loading history...