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<?php
namespace MediaWiki\Block;
use MediaWiki\Request\WebRequest;
use MediaWiki\User\UserIdentity;
use Stringable;
use WeakReference;
/**
* @internal For use by BlockManager
*/
class BlockCacheKey implements Stringable {
/** Whether the key includes a non-null request */
private bool $hasRequest;
/** A reference to the WebRequest or null */
private ?WeakReference $requestRef;
/** A reference to the UserIdentity */
private WeakReference $userRef;
/** Whether the UserIdentity has zero user ID */
private bool $isAnon;
/** The part of the key indicating whether to do queries against the primary DB */
private bool $fromPrimary;
/**
* @param WebRequest|null $request
* @param UserIdentity $user
* @param bool $fromPrimary
*/
public function __construct( ?WebRequest $request, UserIdentity $user, bool $fromPrimary ) {
$this->requestRef = $request ? WeakReference::create( $request ) : null;
$this->hasRequest = (bool)$request;
$this->userRef = WeakReference::create( $user );
$this->isAnon = $user->getId() === 0;
$this->fromPrimary = $fromPrimary;
}
/**
* Compare the request part of the key with another key
*
* @param BlockCacheKey $other
* @return bool
*/
private function requestEquals( self $other ): bool {
if ( $this->hasRequest !== $other->hasRequest ) {
return false;
} elseif ( $this->hasRequest ) {
return $this->requestRef->get()
&& $this->requestRef->get() === $other->requestRef->get();
} else {
return true;
}
}
/**
* Determine whether a new key matches a stored key sufficiently well to
* allow the stored cache entry to be returned.
*
* If a WeakReference in either key has expired, that is considered as
* a mismatch.
*
* @param BlockCacheKey $storedKey
* @return bool
*/
public function matchesStored( self $storedKey ): bool {
return $this->requestEquals( $storedKey )
&& $this->userRef->get()
&& $this->userRef->get() === $storedKey->userRef->get()
&& (
( $this->fromPrimary === $storedKey->fromPrimary )
// If we have data from the primary, allow it to be returned
// when replica data is requested.
|| ( !$this->fromPrimary && $storedKey->fromPrimary )
);
}
/**
* Get the bucket for the cache entry associated with this key.
* Entries with the same partial key will replace each other in the cache.
*/
public function getPartialKey(): string {
if ( $this->hasRequest ) {
return 'req';
}
return $this->isAnon ? 'anon' : 'user';
}
/**
* Determine whether the specified user is the user stored in the key. This
* is used for cache invalidation.
*
* If the WeakReference has expired, it is not possible to serve a cache
* hit for the user, so that is considered to be a mismatch.
*
* @param UserIdentity $user
* @return bool
*/
public function isUser( UserIdentity $user ): bool {
return $this->userRef->get() === $user;
}
/**
* @param WeakReference|null $ref
* @return string
*/
private static function dumpWeakRef( ?WeakReference $ref ): string {
if ( $ref === null ) {
return 'none';
} else {
$obj = $ref->get();
if ( $obj ) {
return '#' . spl_object_id( $obj );
} else {
return 'expired';
}
}
}
/**
* Convert to a string, for debugging
*/
public function __toString(): string {
return 'BlockCacheKey{' .
'request=' . self::dumpWeakRef( $this->requestRef ) . ',' .
'user=' . self::dumpWeakRef( $this->userRef ) . ',' .
( $this->fromPrimary ? 'primary' : 'replica' ) .
'}';
}
}