includes/filerepo/OldLocalFile.php

   1 <?php
   2
   3 /**
   4  * Class to represent a file in the oldimage table
   5  *
   6  * @addtogroup FileRepo
   7  */
   8 class OldLocalFile extends LocalFile {
   9         var $requestedTime, $archive_name;
  10
  11         const CACHE_VERSION = 1;
  12         const MAX_CACHE_ROWS = 20;
  13
  14         static function newFromTitle( $title, $repo, $time ) {
  15                 return new self( $title, $repo, $time, null );
  16         }
  17
  18         static function newFromArchiveName( $title, $repo, $archiveName ) {
  19                 return new self( $title, $repo, null, $archiveName );
  20         }
  21
  22         static function newFromRow( $row, $repo ) {
  23                 $title = Title::makeTitle( NS_IMAGE, $row->oi_name );
  24                 $file = new self( $title, $repo, null, $row->oi_archive_name );
  25                 $file->loadFromRow( $row, 'oi_' );
  26                 return $file;
  27         }
  28
  29         /**
  30          * @param Title $title
  31          * @param FileRepo $repo
  32          * @param string $time Timestamp or null to load by archive name
  33          * @param string $archiveName Archive name or null to load by timestamp
  34          */
  35         function __construct( $title, $repo, $time, $archiveName ) {
  36                 parent::__construct( $title, $repo );
  37                 $this->requestedTime = $time;
  38                 $this->archive_name = $archiveName;
  39                 if ( is_null( $time ) && is_null( $archiveName ) ) {
  40                         throw new MWException( __METHOD__.': must specify at least one of $time or $archiveName' );
  41                 }
  42         }
  43
  44         function getCacheKey() {
  45                 $hashedName = md5($this->getName());
  46                 return wfMemcKey( 'oldfile', $hashedName );
  47         }
  48
  49         function getArchiveName() {
  50                 if ( !isset( $this->archive_name ) ) {
  51                         $this->load();
  52                 }
  53                 return $this->archive_name;
  54         }
  55
  56         function isOld() {
  57                 return true;
  58         }
  59
  60         /**
  61          * Try to load file metadata from memcached. Returns true on success.
  62          */
  63         function loadFromCache() {
  64                 global $wgMemc;
  65                 wfProfileIn( __METHOD__ );
  66                 $this->dataLoaded = false;
  67                 $key = $this->getCacheKey();
  68                 if ( !$key ) {
  69                         return false;
  70                 }
  71                 $oldImages = $wgMemc->get( $key );
  72
  73                 if ( isset( $oldImages['version'] ) && $oldImages['version'] == self::CACHE_VERSION ) {
  74                         unset( $oldImages['version'] );
  75                         $more = isset( $oldImages['more'] );
  76                         unset( $oldImages['more'] );
  77                         $found = false;
  78                         if ( is_null( $this->requestedTime ) ) {
  79                                 foreach ( $oldImages as $timestamp => $info ) {
  80                                         if ( $info['archive_name'] == $this->archive_name ) {
  81                                                 $found = true;
  82                                                 break;
  83                                         }
  84                                 }
  85                         } else {
  86                                 krsort( $oldImages );
  87                                 foreach ( $oldImages as $timestamp => $info ) {
  88                                         if ( $timestamp <= $this->requestedTime ) {
  89                                                 $found = true;
  90                                                 break;
  91                                         }
  92                                 }
  93                         }
  94                         if ( $found ) {
  95                                 wfDebug( "Pulling file metadata from cache key {$key}[{$timestamp}]\n" );
  96                                 $this->dataLoaded = true;
  97                                 $this->fileExists = true;
  98                                 foreach ( $info as $name => $value ) {
  99                                         $this->$name = $value;
 100                                 }
 101                         } elseif ( $more ) {
 102                                 wfDebug( "Cache key was truncated, oldimage row might be found in the database\n" );
 103                         } else {
 104                                 wfDebug( "Image did not exist at the specified time.\n" );
 105                                 $this->fileExists = false;
 106                                 $this->dataLoaded = true;
 107                         }
 108                 }
 109
 110                 if ( $this->dataLoaded ) {
 111                         wfIncrStats( 'image_cache_hit' );
 112                 } else {
 113                         wfIncrStats( 'image_cache_miss' );
 114                 }
 115
 116                 wfProfileOut( __METHOD__ );
 117                 return $this->dataLoaded;
 118         }
 119
 120         function saveToCache() {
 121                 // Cache the entire history of the image (up to MAX_CACHE_ROWS).
 122                 // This is expensive, so we only do it if $wgMemc is real
 123                 global $wgMemc;
 124                 if ( $wgMemc instanceof FakeMemcachedClient ) {
 125                         return;
 126                 }
 127                 $key = $this->getCacheKey();
 128                 if ( !$key ) {
 129                         return;
 130                 }
 131                 wfProfileIn( __METHOD__ );
 132
 133                 $dbr = $this->repo->getSlaveDB();
 134                 $res = $dbr->select( 'oldimage', $this->getCacheFields( 'oi_' ),
 135                         array( 'oi_name' => $this->getName() ), __METHOD__,
 136                         array(
 137                                 'LIMIT' => self::MAX_CACHE_ROWS + 1,
 138                                 'ORDER BY' => 'oi_timestamp DESC',
 139                         ));
 140                 $cache = array( 'version' => self::CACHE_VERSION );
 141                 $numRows = $dbr->numRows( $res );
 142                 if ( $numRows > self::MAX_CACHE_ROWS ) {
 143                         $cache['more'] = true;
 144                         $numRows--;
 145                 }
 146                 for ( $i = 0; $i < $numRows; $i++ ) {
 147                         $row = $dbr->fetchObject( $res );
 148                         $decoded = $this->decodeRow( $row, 'oi_' );
 149                         $cache[$row->oi_timestamp] = $decoded;
 150                 }
 151                 $dbr->freeResult( $res );
 152                 $wgMemc->set( $key, $cache, 7*86400 /* 1 week */ );
 153                 wfProfileOut( __METHOD__ );
 154         }
 155
 156         function loadFromDB() {
 157                 wfProfileIn( __METHOD__ );
 158                 $dbr = $this->repo->getSlaveDB();
 159                 $conds = array( 'oi_name' => $this->getName() );
 160                 if ( is_null( $this->requestedTime ) ) {
 161                         $conds['oi_archive_name'] = $this->archive_name;
 162                 } else {
 163                         $conds[] = 'oi_timestamp <= ' . $dbr->addQuotes( $this->requestedTime );
 164                 }
 165                 $row = $dbr->selectRow( 'oldimage', $this->getCacheFields( 'oi_' ),
 166                         $conds, __METHOD__, array( 'ORDER BY' => 'oi_timestamp DESC' ) );
 167                 if ( $row ) {
 168                         $this->loadFromRow( $row, 'oi_' );
 169                 } else {
 170                         $this->fileExists = false;
 171                 }
 172                 $this->dataLoaded = true;
 173                 wfProfileOut( __METHOD__ );
 174         }
 175
 176         function getCacheFields( $prefix = 'img_' ) {
 177                 $fields = parent::getCacheFields( $prefix );
 178                 $fields[] = $prefix . 'archive_name';
 179
 180                 // XXX: Temporary hack before schema update
 181                 $fields = array_diff( $fields, array(
 182                         'oi_media_type', 'oi_major_mime', 'oi_minor_mime', 'oi_metadata' ) );
 183                 return $fields;
 184         }
 185
 186         function getRel() {
 187                 return 'archive/' . $this->getHashPath() . $this->getArchiveName();
 188         }
 189
 190         function getUrlRel() {
 191                 return 'archive/' . $this->getHashPath() . urlencode( $this->getArchiveName() );
 192         }
 193
 194         function upgradeRow() {
 195                 wfProfileIn( __METHOD__ );
 196
 197                 $this->loadFromFile();
 198
 199                 $dbw = $this->repo->getMasterDB();
 200                 list( $major, $minor ) = self::splitMime( $this->mime );
 201
 202                 wfDebug(__METHOD__.': upgrading '.$this->archive_name." to the current schema\n");
 203                 $dbw->update( 'oldimage',
 204                         array(
 205                                 'oi_width' => $this->width,
 206                                 'oi_height' => $this->height,
 207                                 'oi_bits' => $this->bits,
 208                                 #'oi_media_type' => $this->media_type,
 209                                 #'oi_major_mime' => $major,
 210                                 #'oi_minor_mime' => $minor,
 211                                 #'oi_metadata' => $this->metadata,
 212                                 'oi_sha1' => $this->sha1,
 213                         ), array(
 214                                 'oi_name' => $this->getName(),
 215                                 'oi_archive_name' => $this->archive_name ),
 216                         __METHOD__
 217                 );
 218                 wfProfileOut( __METHOD__ );
 219         }
 220 }
 221
 222
 223