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<?php
/**
* @file
* Interwiki table entry
*/
/**
* The interwiki class
* All information is loaded on creation when called by Interwiki::fetch( $prefix ).
* All work is done on slave, because this should *never* change (except during schema updates etc, which arent wiki-related)
*/
class Interwiki {
// Cache - removes oldest entry when it hits limit
protected static $smCache = array();
const CACHE_LIMIT = 100; // 0 means unlimited, any other value is max number of entries.
protected $mPrefix, $mURL, $mLocal, $mTrans;
function __construct( $prefix = null, $url = '', $local = 0, $trans = 0 )
{
$this->mPrefix = $prefix;
$this->mURL = $url;
$this->mLocal = $local;
$this->mTrans = $trans;
}
/**
* Check whether an interwiki prefix exists
*
* @return bool Whether it exists
* @param $prefix string Interwiki prefix to use
*/
static public function isValidInterwiki( $prefix ){
$result = self::fetch( $prefix );
return (bool)$result;
}
/**
* Fetch an Interwiki object
*
* @return Interwiki Object, or null if not valid
* @param $prefix string Interwiki prefix to use
*/
static public function fetch( $prefix ) {
global $wgContLang;
if( $prefix == '' ) {
return null;
}
$prefix = $wgContLang->lc( $prefix );
if( isset( self::$smCache[$prefix] ) ){
return self::$smCache[$prefix];
}
global $wgInterwikiCache;
if ($wgInterwikiCache) {
$iw = Interwiki::getInterwikiCached( $prefix );
} else {
$iw = Interwiki::load( $prefix );
if( !$iw ){
$iw = false;
}
}
if( self::CACHE_LIMIT && count( self::$smCache ) >= self::CACHE_LIMIT ){
reset( self::$smCache );
unset( self::$smCache[ key( self::$smCache ) ] );
}
self::$smCache[$prefix] = $iw;
return $iw;
}
/**
* Fetch interwiki prefix data from local cache in constant database.
*
* @note More logic is explained in DefaultSettings.
*
* @param $prefix \type{\string} Interwiki prefix
* @return \type{\Interwiki} An interwiki object
*/
protected static function getInterwikiCached( $prefix ) {
$value = self::getInterwikiCacheEntry( $prefix );
$s = new Interwiki( $prefix );
if ( $value != '' ) {
// Split values
list( $local, $url ) = explode( ' ', $value, 2 );
$s->mURL = $url;
$s->mLocal = (int)$local;
}else{
$s = false;
}
return $s;
}
/**
* Get entry from interwiki cache
*
* @note More logic is explained in DefaultSettings.
*
* @param $prefix \type{\string} Database key
* @return \type{\string) The entry
*/
protected static function getInterwikiCacheEntry( $prefix ){
global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
static $db, $site;
wfDebug( __METHOD__ . "( $prefix )\n" );
if( !$db ){
$db = dba_open( $wgInterwikiCache, 'r', 'cdb' );
}
/* Resolve site name */
if( $wgInterwikiScopes>=3 && !$site ) {
$site = dba_fetch( '__sites:' . wfWikiID(), $db );
if ( $site == "" ){
$site = $wgInterwikiFallbackSite;
}
}
$value = dba_fetch( wfMemcKey( $prefix ), $db );
// Site level
if ( $value == '' && $wgInterwikiScopes >= 3 ) {
$value = dba_fetch( "_{$site}:{$prefix}", $db );
}
// Global Level
if ( $value == '' && $wgInterwikiScopes >= 2 ) {
$value = dba_fetch( "__global:{$prefix}", $db );
}
if ( $value == 'undef' )
$value = '';
return $value;
}
/**
* Load the interwiki, trying first memcached then the DB
*
* @param $prefix The interwiki prefix
* @return bool The prefix is valid
* @static
*
*/
protected static function load( $prefix ) {
global $wgMemc, $wgInterwikiExpiry;
$key = wfMemcKey( 'interwiki', $prefix );
$mc = $wgMemc->get( $key );
$iw = false;
if( $mc && is_array( $mc ) ){ // is_array is hack for old keys
$iw = Interwiki::loadFromArray( $mc );
if( $iw ){
return $iw;
}
}
$db = wfGetDB( DB_SLAVE );
$row = $db->fetchRow( $db->select( 'interwiki', '*', array( 'iw_prefix' => $prefix ),
__METHOD__ ) );
$iw = Interwiki::loadFromArray( $row );
if ( $iw ) {
$mc = array( 'iw_url' => $iw->mURL, 'iw_local' => $iw->mLocal, 'iw_trans' => $iw->mTrans );
$wgMemc->add( $key, $mc, $wgInterwikiExpiry );
return $iw;
}
return false;
}
/**
* Fill in member variables from an array (e.g. memcached result, Database::fetchRow, etc)
*
* @return bool Whether everything was there
* @param $res ResultWrapper Row from the interwiki table
* @static
*/
protected static function loadFromArray( $mc ) {
if( isset( $mc['iw_url'] ) && isset( $mc['iw_local'] ) && isset( $mc['iw_trans'] ) ){
$iw = new Interwiki();
$iw->mURL = $mc['iw_url'];
$iw->mLocal = $mc['iw_local'];
$iw->mTrans = $mc['iw_trans'];
return $iw;
}
return false;
}
/**
* Get the URL for a particular title (or with $1 if no title given)
*
* @param $title string What text to put for the article name
* @return string The URL
*/
function getURL( $title = null ){
$url = $this->mURL;
if( $title != null ){
$url = str_replace( "$1", $title, $url );
}
return $url;
}
function isLocal(){
return $this->mLocal;
}
function isTranscludable(){
return $this->mTrans;
}
}
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