if( $loggedOut !== null ) {
$this->mTouched = wfTimestamp( TS_MW, $loggedOut );
} else {
- $this->mTouched = '0'; # Allow any pages to be cached
+ $this->mTouched = '1'; # Allow any pages to be cached
}
$this->mToken = null; // Don't run cryptographic functions till we need a token
}
/**
- * Add this existing user object to the database
+ * Add this existing user object to the database. If the user already
+ * exists, a fatal status object is returned, and the user object is
+ * initialised with the data from the database.
+ *
+ * Previously, this function generated a DB error due to a key conflict
+ * if the user already existed. Many extension callers use this function
+ * in code along the lines of:
+ *
+ * $user = User::newFromName( $name );
+ * if ( !$user->isLoggedIn() ) {
+ * $user->addToDatabase();
+ * }
+ * // do something with $user...
+ *
+ * However, this was vulnerable to a race condition (bug 16020). By
+ * initialising the user object if the user exists, we aim to support this
+ * calling sequence as far as possible.
+ *
+ * Note that if the user exists, this function will acquire a write lock,
+ * so it is still advisable to make the call conditional on isLoggedIn(),
+ * and to commit the transaction after calling.
+ *
+ * @return Status
*/
public function addToDatabase() {
$this->load();
'user_registration' => $dbw->timestamp( $this->mRegistration ),
'user_editcount' => 0,
'user_touched' => $dbw->timestamp( $this->mTouched ),
- ), __METHOD__
+ ), __METHOD__,
+ array( 'IGNORE' )
);
+ if ( !$dbw->affectedRows() ) {
+ $this->mId = $dbw->selectField( 'user', 'user_id',
+ array( 'user_name' => $this->mName ), __METHOD__ );
+ $loaded = false;
+ if ( $this->mId ) {
+ if ( $this->loadFromDatabase() ) {
+ $loaded = true;
+ }
+ }
+ if ( !$loaded ) {
+ throw new MWException( __METHOD__. ": hit a key conflict attempting " .
+ "to insert a user row, but then it doesn't exist when we select it!" );
+ }
+ return Status::newFatal( 'userexists' );
+ }
$this->mId = $dbw->insertId();
// Clear instance cache other than user table data, which is already accurate
$this->clearInstanceCache();
$this->saveOptions();
+ return Status::newGood();
}
/**