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<?php
namespace MediaWiki\CheckUser;
use Wikimedia\Rdbms\ILoadBalancer;
use Wikimedia\Rdbms\Subquery;
class CompareService extends ChangeService {
/** @var int */
private $limit;
/**
* @param ILoadBalancer $loadBalancer
* @param UserManager $userManager
* @param int $limit Maximum number of rows to access (T245499)
*/
public function __construct(
ILoadBalancer $loadBalancer,
UserManager $userManager,
$limit = 100000
) {
parent::__construct( $loadBalancer, $userManager );
$this->limit = $limit;
}
/**
* Get edits made from an ip
*
* @param string $ipHex
* @param string|null $excludeUser
* @return int
*/
public function getTotalEditsFromIp(
string $ipHex,
string $excludeUser = null
) : int {
$db = $this->loadBalancer->getConnectionRef( DB_REPLICA );
$conds = [
'cuc_ip_hex' => $ipHex,
'cuc_type' => [ RC_EDIT, RC_NEW ],
];
if ( $excludeUser ) {
$conds[] = 'cuc_user_text != ' . $db->addQuotes( $excludeUser );
}
return $db->selectRowCount( 'cu_changes', '*', $conds, __METHOD__ );
}
/**
* Get the compare query info
*
* @param string[] $targets
* @param string[] $excludeTargets
* @param string $start
* @return array
*/
public function getQueryInfo( array $targets, array $excludeTargets, string $start ): array {
$db = $this->loadBalancer->getConnectionRef( DB_REPLICA );
if ( $targets === [] ) {
throw new \LogicException( 'Cannot get query info when $targets is empty.' );
}
$limit = (int)( $this->limit / count( $targets ) );
$sqlText = [];
foreach ( $targets as $target ) {
$info = $this->getQueryInfoForSingleTarget( $target, $excludeTargets, $start, $limit );
if ( $info !== null ) {
if ( !$db->unionSupportsOrderAndLimit() ) {
unset( $info['options']['ORDER BY'], $info['options']['LIMIT'] );
}
$sqlText[] = $db->selectSQLText(
$info['tables'],
$info['fields'],
$info['conds'],
__METHOD__,
$info['options']
);
}
}
$derivedTable = $db->unionQueries( $sqlText, $db::UNION_DISTINCT );
return [
'tables' => [ 'a' => new Subquery( $derivedTable ) ],
'fields' => [
'cuc_user' => 'a.cuc_user',
'cuc_user_text' => 'a.cuc_user_text',
'cuc_ip' => 'a.cuc_ip',
'cuc_ip_hex' => 'a.cuc_ip_hex',
'cuc_agent' => 'a.cuc_agent',
'first_edit' => 'MIN(a.cuc_timestamp)',
'last_edit' => 'MAX(a.cuc_timestamp)',
'total_edits' => 'count(*)',
],
'options' => [
'GROUP BY' => [
'cuc_user_text',
'cuc_ip_hex',
'cuc_agent',
],
],
];
}
/**
* Get the query info for a single target.
*
* For the main investigation, this becomes a subquery that contributes to a derived
* table, used by getQueryInfo.
*
* For a limit check, this query is used to check whether the number of results for
* the target exceed the limit-per-target in getQueryInfo.
*
* @param string $target
* @param string[] $excludeTargets
* @param string $start
* @param int $limitPerTarget
* @param bool $limitCheck
* @return array|null Return null for invalid target
*/
public function getQueryInfoForSingleTarget(
string $target,
array $excludeTargets,
string $start,
int $limitPerTarget,
$limitCheck = false
) : ?array {
if ( $limitCheck ) {
$orderBy = null;
$offset = $limitPerTarget;
$limit = 1;
} else {
$orderBy = 'cuc_timestamp DESC';
$offset = null;
$limit = $limitPerTarget;
}
$conds = $this->buildTargetConds( $target );
if ( $conds === [] ) {
return null;
}
$conds = array_merge(
$conds,
$this->buildExcludeTargetsConds( $excludeTargets ),
$this->buildStartConds( $start )
);
$conds['cuc_type'] = [ RC_EDIT, RC_NEW ];
return [
'tables' => 'cu_changes',
'fields' => [
'cuc_id',
'cuc_user',
'cuc_user_text',
'cuc_ip',
'cuc_ip_hex',
'cuc_agent',
'cuc_timestamp',
],
'conds' => $conds,
'options' => [
'ORDER BY' => $orderBy,
'LIMIT' => $limit,
'OFFSET' => $offset,
],
];
}
/**
* Check if we have incomplete data for any of the targets.
*
* @param string[] $targets
* @param string[] $excludeTargets
* @param string $start
* @return string[]
*/
public function getTargetsOverLimit(
array $targets,
array $excludeTargets,
string $start
) : array {
if ( $targets === [] ) {
return $targets;
}
$db = $this->loadBalancer->getConnectionRef( DB_REPLICA );
// If the database does not support order and limit on a UNION
// then none of the targets can be over the limit.
if ( !$db->unionSupportsOrderAndLimit() ) {
return [];
}
$targetsOverLimit = [];
$offset = (int)( $this->limit / count( $targets ) );
foreach ( $targets as $target ) {
$info = $this->getQueryInfoForSingleTarget( $target, $excludeTargets, $start, $offset, true );
if ( $info !== null ) {
$limitCheck = $db->select(
$info['tables'],
$info['fields'],
$info['conds'],
__METHOD__,
$info['options']
);
if ( $limitCheck->numRows() > 0 ) {
$targetsOverLimit[] = $target;
}
}
}
return $targetsOverLimit;
}
}
|
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