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1 |
1 | <?php |
2 | /** |
3 | * This file deals with RAII style scoped callbacks. |
4 | * |
5 | * Copyright (C) 2016 Aaron Schulz <aschulz@wikimedia.org> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; if not, write to the Free Software Foundation, Inc., |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
20 | * http://www.gnu.org/copyleft/gpl.html |
21 | * |
22 | * @file |
23 | */ |
24 | |
25 | namespace Wikimedia; |
26 | |
27 | use InvalidArgumentException; |
28 | use UnexpectedValueException; |
29 | |
30 | /** |
31 | * Make a callback run when a dummy object leaves the scope. |
32 | */ |
33 | class ScopedCallback { |
34 | /** @var callable|null */ |
35 | protected $callback; |
36 | /** @var array */ |
37 | protected $params; |
38 | |
39 | /** |
40 | * @param callable|null $callback |
41 | * @param array $params Callback arguments (since 1.0.0, MediaWiki 1.25) |
42 | */ |
43 | public function __construct( $callback, array $params = [] ) { |
44 | if ( $callback !== null && !is_callable( $callback ) ) { |
45 | throw new InvalidArgumentException( 'Provided callback is not valid.' ); |
46 | } |
47 | $this->callback = $callback; |
48 | $this->params = $params; |
49 | } |
50 | |
51 | /** |
52 | * Trigger a scoped callback and destroy it. |
53 | * This is the same as just setting it to null. |
54 | * |
55 | * @param ScopedCallback|null &$sc |
56 | */ |
57 | public static function consume( ScopedCallback &$sc = null ) { |
58 | $sc = null; |
59 | } |
60 | |
61 | /** |
62 | * Destroy a scoped callback without triggering it. |
63 | * |
64 | * @param ScopedCallback|null &$sc |
65 | */ |
66 | public static function cancel( ScopedCallback &$sc = null ) { |
67 | if ( $sc ) { |
68 | $sc->callback = null; |
69 | } |
70 | $sc = null; |
71 | } |
72 | |
73 | /** |
74 | * Make PHP ignore user aborts/disconnects until the returned |
75 | * value leaves scope. This returns null and does nothing in CLI mode. |
76 | * |
77 | * @since 3.0.0 |
78 | * @return ScopedCallback|null |
79 | * |
80 | * @codeCoverageIgnore CI is only run via CLI, so this will never be exercised. |
81 | * Also no benefit testing a function just returns null. |
82 | */ |
83 | public static function newScopedIgnoreUserAbort() { |
84 | // ignore_user_abort previously caused an infinite loop on CLI |
85 | // https://bugs.php.net/bug.php?id=47540 |
86 | if ( PHP_SAPI != 'cli' ) { |
87 | // avoid half-finished operations |
88 | $old = ignore_user_abort( true ); |
89 | return new ScopedCallback( static function () use ( $old ) { |
90 | ignore_user_abort( (bool)$old ); |
91 | } ); |
92 | } |
93 | |
94 | return null; |
95 | } |
96 | |
97 | /** |
98 | * Trigger the callback when it leaves scope. |
99 | */ |
100 | function __destruct() { |
101 | if ( $this->callback !== null ) { |
102 | call_user_func_array( $this->callback, $this->params ); |
103 | } |
104 | } |
105 | |
106 | /** |
107 | * Do not allow this class to be serialized |
108 | * @return never |
109 | */ |
110 | function __sleep() { |
111 | throw new UnexpectedValueException( __CLASS__ . ' cannot be serialized' ); |
112 | } |
113 | |
114 | /** |
115 | * Protect the caller against arbitrary code execution |
116 | * @return never |
117 | */ |
118 | function __wakeup() { |
119 | $this->callback = null; |
120 | throw new UnexpectedValueException( __CLASS__ . ' cannot be unserialized' ); |
121 | } |
122 | } |