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1 | <?php |
2 | |
3 | namespace MediaWiki\Block; |
4 | |
5 | use MediaWiki\Request\WebRequest; |
6 | use MediaWiki\User\UserIdentity; |
7 | use Stringable; |
8 | use WeakReference; |
9 | |
10 | /** |
11 | * @internal For use by BlockManager |
12 | */ |
13 | class BlockCacheKey implements Stringable { |
14 | /** Whether the key includes a non-null request */ |
15 | private bool $hasRequest; |
16 | /** A reference to the WebRequest or null */ |
17 | private ?WeakReference $requestRef; |
18 | /** A reference to the UserIdentity */ |
19 | private WeakReference $userRef; |
20 | /** Whether the UserIdentity has zero user ID */ |
21 | private bool $isAnon; |
22 | /** The part of the key indicating whether to do queries against the primary DB */ |
23 | private bool $fromPrimary; |
24 | |
25 | /** |
26 | * @param WebRequest|null $request |
27 | * @param UserIdentity $user |
28 | * @param bool $fromPrimary |
29 | */ |
30 | public function __construct( ?WebRequest $request, UserIdentity $user, bool $fromPrimary ) { |
31 | $this->requestRef = $request ? WeakReference::create( $request ) : null; |
32 | $this->hasRequest = (bool)$request; |
33 | $this->userRef = WeakReference::create( $user ); |
34 | $this->isAnon = $user->getId() === 0; |
35 | $this->fromPrimary = $fromPrimary; |
36 | } |
37 | |
38 | /** |
39 | * Compare the request part of the key with another key |
40 | * |
41 | * @param BlockCacheKey $other |
42 | * @return bool |
43 | */ |
44 | private function requestEquals( self $other ): bool { |
45 | if ( $this->hasRequest !== $other->hasRequest ) { |
46 | return false; |
47 | } elseif ( $this->hasRequest ) { |
48 | return $this->requestRef->get() |
49 | && $this->requestRef->get() === $other->requestRef->get(); |
50 | } else { |
51 | return true; |
52 | } |
53 | } |
54 | |
55 | /** |
56 | * Determine whether a new key matches a stored key sufficiently well to |
57 | * allow the stored cache entry to be returned. |
58 | * |
59 | * If a WeakReference in either key has expired, that is considered as |
60 | * a mismatch. |
61 | * |
62 | * @param BlockCacheKey $storedKey |
63 | * @return bool |
64 | */ |
65 | public function matchesStored( self $storedKey ): bool { |
66 | return $this->requestEquals( $storedKey ) |
67 | && $this->userRef->get() |
68 | && $this->userRef->get() === $storedKey->userRef->get() |
69 | && ( |
70 | ( $this->fromPrimary === $storedKey->fromPrimary ) |
71 | // If we have data from the primary, allow it to be returned |
72 | // when replica data is requested. |
73 | || ( !$this->fromPrimary && $storedKey->fromPrimary ) |
74 | ); |
75 | } |
76 | |
77 | /** |
78 | * Get the bucket for the cache entry associated with this key. |
79 | * Entries with the same partial key will replace each other in the cache. |
80 | * |
81 | * @return string |
82 | */ |
83 | public function getPartialKey(): string { |
84 | if ( $this->hasRequest ) { |
85 | return 'req'; |
86 | } |
87 | return $this->isAnon ? 'anon' : 'user'; |
88 | } |
89 | |
90 | /** |
91 | * Determine whether the specified user is the user stored in the key. This |
92 | * is used for cache invalidation. |
93 | * |
94 | * If the WeakReference has expired, it is not possible to serve a cache |
95 | * hit for the user, so that is considered to be a mismatch. |
96 | * |
97 | * @param UserIdentity $user |
98 | * @return bool |
99 | */ |
100 | public function isUser( UserIdentity $user ): bool { |
101 | return $this->userRef->get() === $user; |
102 | } |
103 | |
104 | /** |
105 | * @param WeakReference|null $ref |
106 | * @return string |
107 | */ |
108 | private static function dumpWeakRef( ?WeakReference $ref ): string { |
109 | if ( $ref === null ) { |
110 | return 'none'; |
111 | } else { |
112 | $obj = $ref->get(); |
113 | if ( $obj ) { |
114 | return '#' . spl_object_id( $obj ); |
115 | } else { |
116 | return 'expired'; |
117 | } |
118 | } |
119 | } |
120 | |
121 | /** |
122 | * Convert to a string, for debugging |
123 | * |
124 | * @return string |
125 | */ |
126 | public function __toString(): string { |
127 | return 'BlockCacheKey{' . |
128 | 'request=' . self::dumpWeakRef( $this->requestRef ) . ',' . |
129 | 'user=' . self::dumpWeakRef( $this->userRef ) . ',' . |
130 | ( $this->fromPrimary ? 'primary' : 'replica' ) . |
131 | '}'; |
132 | } |
133 | } |