|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Tourstream\RedisLockStrategy; |
|
4
|
|
|
|
|
5
|
|
|
/*************************************************************** |
|
6
|
|
|
* Copyright notice |
|
7
|
|
|
* |
|
8
|
|
|
* (c) 2017 Alexander Miehe ([email protected]) |
|
9
|
|
|
* All rights reserved |
|
10
|
|
|
* |
|
11
|
|
|
* You may not remove or change the name of the author above. See: |
|
12
|
|
|
* http://www.gnu.org/licenses/gpl-faq.html#IWantCredit |
|
13
|
|
|
* |
|
14
|
|
|
* This script is part of the Typo3 project. The Typo3 project is |
|
15
|
|
|
* free software; you can redistribute it and/or modify |
|
16
|
|
|
* it under the terms of the GNU General Public License as published by |
|
17
|
|
|
* the Free Software Foundation; either version 3 of the License, or |
|
18
|
|
|
* (at your option) any later version. |
|
19
|
|
|
* |
|
20
|
|
|
* The GNU General Public License can be found at |
|
21
|
|
|
* http://www.gnu.org/copyleft/gpl.html. |
|
22
|
|
|
* A copy is found in the LICENSE and distributed with these scripts. |
|
23
|
|
|
* |
|
24
|
|
|
* |
|
25
|
|
|
* This script is distributed in the hope that it will be useful, |
|
26
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
27
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
28
|
|
|
* GNU General Public License for more details. |
|
29
|
|
|
* |
|
30
|
|
|
* This copyright notice MUST APPEAR in all copies of the script! |
|
31
|
|
|
***************************************************************/ |
|
32
|
|
|
|
|
33
|
|
|
use TYPO3\CMS\Core\Locking\Exception\LockAcquireException; |
|
34
|
|
|
use TYPO3\CMS\Core\Locking\Exception\LockCreateException; |
|
35
|
|
|
use TYPO3\CMS\Core\Locking\Exception\LockAcquireWouldBlockException; |
|
36
|
|
|
use TYPO3\CMS\Core\Locking\LockingStrategyInterface; |
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* @author Alexander Miehe <[email protected]> |
|
40
|
|
|
*/ |
|
41
|
|
|
class RedisLockStrategy implements LockingStrategyInterface |
|
42
|
|
|
{ |
|
43
|
|
|
/** |
|
44
|
|
|
* @var \Redis A key-value data store |
|
45
|
|
|
*/ |
|
46
|
|
|
private $redis; |
|
47
|
|
|
|
|
48
|
|
|
/** |
|
49
|
|
|
* @var string The locking subject, i.e. a string to discriminate the lock |
|
50
|
|
|
*/ |
|
51
|
|
|
private $subject; |
|
52
|
|
|
|
|
53
|
|
|
/** |
|
54
|
|
|
* @var boolean TRUE if lock is acquired |
|
55
|
|
|
*/ |
|
56
|
|
|
private $isAcquired = false; |
|
57
|
|
|
|
|
58
|
|
|
/** |
|
59
|
|
|
* @var int Seconds the lock remains persistent |
|
60
|
|
|
*/ |
|
61
|
|
|
private $ttl = 3600; |
|
62
|
|
|
|
|
63
|
|
|
/** |
|
64
|
|
|
* @var int Seconds to wait for a lock |
|
65
|
|
|
*/ |
|
66
|
|
|
private $blTo = 60; |
|
67
|
|
|
|
|
68
|
|
|
/** |
|
69
|
|
|
* @inheritdoc |
|
70
|
|
|
*/ |
|
71
|
10 |
|
public function __construct($subject) |
|
72
|
|
|
{ |
|
73
|
10 |
|
$config = null; |
|
74
|
|
|
|
|
75
|
10 |
|
if (\array_key_exists('redis_lock', $GLOBALS['TYPO3_CONF_VARS']['SYS'])) { |
|
76
|
9 |
|
$config = $GLOBALS['TYPO3_CONF_VARS']['SYS']['redis_lock']; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
10 |
|
if (!\is_array($config)) { |
|
80
|
2 |
|
throw new LockCreateException('no configuration for redis lock strategy found'); |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
8 |
|
if (!\array_key_exists('host', $config)) { |
|
84
|
1 |
|
throw new LockCreateException('no host for redis lock strategy found'); |
|
85
|
|
|
} |
|
86
|
7 |
|
$port = 6379; |
|
87
|
|
|
|
|
88
|
7 |
|
if (\array_key_exists('port', $config)) { |
|
89
|
6 |
|
$port = (int) $config['port']; |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
7 |
|
if (!\array_key_exists('database', $config)) { |
|
93
|
1 |
|
throw new LockCreateException('no database for redis lock strategy found'); |
|
94
|
|
|
} |
|
95
|
|
|
|
|
96
|
6 |
|
if (\array_key_exists('ttl', $config)) { |
|
97
|
|
|
$this->ttl = (int) $config['ttl']; |
|
98
|
|
|
} |
|
99
|
|
|
|
|
100
|
6 |
|
$this->subject = $subject; |
|
101
|
6 |
|
$this->redis = new \Redis(); |
|
102
|
6 |
|
$this->redis->connect($config['host'], $port); |
|
103
|
|
|
|
|
104
|
6 |
|
if (\array_key_exists('auth', $config)) { |
|
105
|
|
|
$this->redis->auth($config['auth']); |
|
106
|
|
|
} |
|
107
|
|
|
|
|
108
|
6 |
|
$this->redis->select((int) $config['database']); |
|
109
|
|
|
|
|
110
|
6 |
|
if (!$this->redis->exists($this->subject)) { |
|
111
|
6 |
|
$this->create(); |
|
112
|
|
|
} |
|
113
|
6 |
|
} |
|
114
|
|
|
|
|
115
|
|
|
/** |
|
116
|
|
|
* @inheritdoc |
|
117
|
|
|
*/ |
|
118
|
10 |
|
public static function getCapabilities() |
|
119
|
|
|
{ |
|
120
|
10 |
|
return self::LOCK_CAPABILITY_EXCLUSIVE | self::LOCK_CAPABILITY_NOBLOCK; |
|
121
|
|
|
} |
|
122
|
|
|
|
|
123
|
|
|
/** |
|
124
|
|
|
* @inheritdoc |
|
125
|
|
|
*/ |
|
126
|
10 |
|
public static function getPriority() |
|
127
|
|
|
{ |
|
128
|
10 |
|
return 100; |
|
129
|
|
|
} |
|
130
|
|
|
|
|
131
|
|
|
/** |
|
132
|
|
|
* @inheritdoc |
|
133
|
|
|
*/ |
|
134
|
4 |
|
public function acquire($mode = self::LOCK_CAPABILITY_EXCLUSIVE) |
|
135
|
|
|
{ |
|
136
|
4 |
|
if ($this->isAcquired) { |
|
137
|
|
|
return true; |
|
138
|
|
|
} |
|
139
|
|
|
|
|
140
|
4 |
|
if ($mode & self::LOCK_CAPABILITY_EXCLUSIVE) { |
|
141
|
|
|
|
|
142
|
4 |
|
if ($mode & self::LOCK_CAPABILITY_NOBLOCK) { |
|
143
|
|
|
|
|
144
|
1 |
|
echo $this->redis->llen($this->subject); |
|
145
|
|
|
|
|
146
|
1 |
|
$r = $this->redis->lPop($this->subject); |
|
|
|
|
|
|
147
|
|
|
|
|
148
|
1 |
|
echo $r; |
|
149
|
|
|
|
|
150
|
|
|
// this does not block |
|
151
|
1 |
|
$this->isAcquired = (bool) $r; |
|
152
|
|
|
|
|
153
|
1 |
|
if (!$this->isAcquired) { |
|
154
|
1 |
|
throw new LockAcquireWouldBlockException('could not acquire lock'); |
|
155
|
|
|
} |
|
156
|
|
|
} else { |
|
157
|
|
|
|
|
158
|
|
|
// this blocks iff the list is empty |
|
159
|
3 |
|
$this->isAcquired = (bool) $this->redis->blPop([$this->subject], $this->blTo); |
|
160
|
|
|
|
|
161
|
3 |
|
if (!$this->isAcquired) { |
|
162
|
4 |
|
throw new LockAcquireException('could not acquire lock'); |
|
163
|
|
|
} |
|
164
|
|
|
} |
|
165
|
|
|
|
|
166
|
|
|
} else { |
|
167
|
|
|
throw new LockAcquireException('insufficient capabilities'); |
|
168
|
|
|
} |
|
169
|
|
|
|
|
170
|
4 |
|
return true; |
|
171
|
|
|
} |
|
172
|
|
|
|
|
173
|
|
|
/** |
|
174
|
|
|
* @inheritdoc |
|
175
|
|
|
*/ |
|
176
|
2 |
|
public function isAcquired() |
|
177
|
|
|
{ |
|
178
|
2 |
|
return $this->isAcquired; |
|
179
|
|
|
} |
|
180
|
|
|
|
|
181
|
|
|
/** |
|
182
|
|
|
* @inheritdoc |
|
183
|
|
|
*/ |
|
184
|
2 |
|
public function destroy() |
|
185
|
|
|
{ |
|
186
|
2 |
|
$this->redis->del($this->subject); |
|
187
|
2 |
|
} |
|
188
|
|
|
|
|
189
|
|
|
/** |
|
190
|
|
|
* @inheritdoc |
|
191
|
|
|
*/ |
|
192
|
1 |
|
public function release() |
|
193
|
|
|
{ |
|
194
|
1 |
|
if (!$this->isAcquired) { |
|
195
|
1 |
|
return true; |
|
196
|
|
|
} |
|
197
|
|
|
|
|
198
|
1 |
|
$this->isAcquired = !$this->create(); |
|
199
|
|
|
|
|
200
|
1 |
|
return !$this->isAcquired; |
|
201
|
|
|
} |
|
202
|
|
|
|
|
203
|
|
|
/** |
|
204
|
|
|
* create synchronization object, i.e. |
|
205
|
|
|
* a simple list with some single random value |
|
206
|
|
|
* |
|
207
|
|
|
* @return boolean TRUE on success |
|
208
|
|
|
* @throws LockCreateException |
|
209
|
|
|
*/ |
|
210
|
6 |
|
private function create() |
|
211
|
|
|
{ |
|
212
|
6 |
|
if (!$this->redis->rPush($this->subject, uniqid())) { |
|
213
|
|
|
throw new LockCreateException('could not create lock entry'); |
|
214
|
|
|
} |
|
215
|
|
|
|
|
216
|
6 |
|
if (!$this->redis->expire($this->subject, $this->ttl)) { |
|
217
|
|
|
throw new LockCreateException('could not set ttl to lock entry'); |
|
218
|
|
|
} |
|
219
|
|
|
|
|
220
|
6 |
|
return true; |
|
221
|
|
|
} |
|
222
|
|
|
|
|
223
|
|
|
} |
|
224
|
|
|
|
tourstream /
typo3-redis-lock-strategy
Short variable names may make your code harder to understand. Variable names should be self-descriptive. This check looks for variable names who are shorter than a configured minimum.