maintenance/backup.inc

   1 <?php
   2 /**
   3  * Base classes for database dumpers
   4  *
   5  * Copyright © 2005 Brion Vibber <brion@pobox.com>
   6  * http://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Dump Maintenance
  25  */
  26
  27 /**
  28  * @ingroup Dump Maintenance
  29  */
  30 class DumpDBZip2Output extends DumpPipeOutput {
  31         function __construct( $file ) {
  32                 parent::__construct( "dbzip2", $file );
  33         }
  34 }
  35
  36 /**
  37  * @ingroup Dump Maintenance
  38  */
  39 class BackupDumper {
  40         var $reportingInterval = 100;
  41         var $reporting = true;
  42         var $pageCount = 0;
  43         var $revCount  = 0;
  44         var $server    = null; // use default
  45         var $pages     = null; // all pages
  46         var $skipHeader = false; // don't output <mediawiki> and <siteinfo>
  47         var $skipFooter = false; // don't output </mediawiki>
  48         var $startId    = 0;
  49         var $endId      = 0;
  50         var $revStartId = 0;
  51         var $revEndId   = 0;
  52         var $sink       = null; // Output filters
  53         var $stubText   = false; // include rev_text_id instead of text; for 2-pass dump
  54         var $dumpUploads = false;
  55         var $dumpUploadFileContents = false;
  56         var $lastTime = 0;
  57         var $pageCountLast = 0;
  58         var $revCountLast = 0;
  59         var $ID = 0;
  60
  61         var $outputTypes = array(), $filterTypes = array();
  62
  63         /**
  64          * The dependency-injected database to use.
  65          *
  66          * @var DatabaseBase|null
  67          *
  68          * @see self::setDb
  69          */
  70         protected $forcedDb = null;
  71
  72         /**
  73          * @var LoadBalancer
  74          */
  75         protected $lb;
  76
  77         function __construct( $args ) {
  78                 $this->stderr = fopen( "php://stderr", "wt" );
  79
  80                 // Built-in output and filter plugins
  81                 $this->registerOutput( 'file', 'DumpFileOutput' );
  82                 $this->registerOutput( 'gzip', 'DumpGZipOutput' );
  83                 $this->registerOutput( 'bzip2', 'DumpBZip2Output' );
  84                 $this->registerOutput( 'dbzip2', 'DumpDBZip2Output' );
  85                 $this->registerOutput( '7zip', 'Dump7ZipOutput' );
  86
  87                 $this->registerFilter( 'latest', 'DumpLatestFilter' );
  88                 $this->registerFilter( 'notalk', 'DumpNotalkFilter' );
  89                 $this->registerFilter( 'namespace', 'DumpNamespaceFilter' );
  90
  91                 $this->sink = $this->processArgs( $args );
  92         }
  93
  94         /**
  95          * @param $name String
  96          * @param $class String: name of output filter plugin class
  97          */
  98         function registerOutput( $name, $class ) {
  99                 $this->outputTypes[$name] = $class;
 100         }
 101
 102         /**
 103          * @param $name String
 104          * @param $class String: name of filter plugin class
 105          */
 106         function registerFilter( $name, $class ) {
 107                 $this->filterTypes[$name] = $class;
 108         }
 109
 110         /**
 111          * Load a plugin and register it
 112          *
 113          * @param $class String: name of plugin class; must have a static 'register'
 114          *               method that takes a BackupDumper as a parameter.
 115          * @param $file String: full or relative path to the PHP file to load, or empty
 116          */
 117         function loadPlugin( $class, $file ) {
 118                 if ( $file != '' ) {
 119                         require_once( $file );
 120                 }
 121                 $register = array( $class, 'register' );
 122                 call_user_func_array( $register, array( &$this ) );
 123         }
 124
 125         /**
 126          * @param $args Array
 127          * @return Array
 128          */
 129         function processArgs( $args ) {
 130                 $sink = null;
 131                 $sinks = array();
 132                 foreach ( $args as $arg ) {
 133                         $matches = array();
 134                         if ( preg_match( '/^--(.+?)(?:=(.+?)(?::(.+?))?)?$/', $arg, $matches ) ) {
 135                                 @list( /* $full */ , $opt, $val, $param ) = $matches;
 136                                 switch( $opt ) {
 137                                 case "plugin":
 138                                         $this->loadPlugin( $val, $param );
 139                                         break;
 140                                 case "output":
 141                                         if ( !is_null( $sink ) ) {
 142                                                 $sinks[] = $sink;
 143                                         }
 144                                         if ( !isset( $this->outputTypes[$val] ) ) {
 145                                                 $this->fatalError( "Unrecognized output sink type '$val'" );
 146                                         }
 147                                         $type = $this->outputTypes[$val];
 148                                         $sink = new $type( $param );
 149                                         break;
 150                                 case "filter":
 151                                         if ( is_null( $sink ) ) {
 152                                                 $sink = new DumpOutput();
 153                                         }
 154                                         if ( !isset( $this->filterTypes[$val] ) ) {
 155                                                 $this->fatalError( "Unrecognized filter type '$val'" );
 156                                         }
 157                                         $type = $this->filterTypes[$val];
 158                                         $filter = new $type( $sink, $param );
 159
 160                                         // references are lame in php...
 161                                         unset( $sink );
 162                                         $sink = $filter;
 163
 164                                         break;
 165                                 case "report":
 166                                         $this->reportingInterval = intval( $val );
 167                                         break;
 168                                 case "server":
 169                                         $this->server = $val;
 170                                         break;
 171                                 case "force-normal":
 172                                         if ( !function_exists( 'utf8_normalize' ) ) {
 173                                                 wfDl( "php_utfnormal.so" );
 174                                                 if ( !function_exists( 'utf8_normalize' ) ) {
 175                                                         $this->fatalError( "Failed to load UTF-8 normalization extension. " .
 176                                                                 "Install or remove --force-normal parameter to use slower code." );
 177                                                 }
 178                                         }
 179                                         break;
 180                                 default:
 181                                         $this->processOption( $opt, $val, $param );
 182                                 }
 183                         }
 184                 }
 185
 186                 if ( is_null( $sink ) ) {
 187                         $sink = new DumpOutput();
 188                 }
 189                 $sinks[] = $sink;
 190
 191                 if ( count( $sinks ) > 1 ) {
 192                         return new DumpMultiWriter( $sinks );
 193                 } else {
 194                         return $sink;
 195                 }
 196         }
 197
 198         function processOption( $opt, $val, $param ) {
 199                 // extension point for subclasses to add options
 200         }
 201
 202         function dump( $history, $text = WikiExporter::TEXT ) {
 203                 # Notice messages will foul up your XML output even if they're
 204                 # relatively harmless.
 205                 if ( ini_get( 'display_errors' ) )
 206                         ini_set( 'display_errors', 'stderr' );
 207
 208                 $this->initProgress( $history );
 209
 210                 $db = $this->backupDb();
 211                 $exporter = new WikiExporter( $db, $history, WikiExporter::STREAM, $text );
 212                 $exporter->dumpUploads = $this->dumpUploads;
 213                 $exporter->dumpUploadFileContents = $this->dumpUploadFileContents;
 214
 215                 $wrapper = new ExportProgressFilter( $this->sink, $this );
 216                 $exporter->setOutputSink( $wrapper );
 217
 218                 if ( !$this->skipHeader )
 219                         $exporter->openStream();
 220                 # Log item dumps: all or by range
 221                 if ( $history & WikiExporter::LOGS ) {
 222                         if ( $this->startId || $this->endId ) {
 223                                 $exporter->logsByRange( $this->startId, $this->endId );
 224                         } else {
 225                                 $exporter->allLogs();
 226                         }
 227                 # Page dumps: all or by page ID range
 228                 } else if ( is_null( $this->pages ) ) {
 229                         if ( $this->startId || $this->endId ) {
 230                                 $exporter->pagesByRange( $this->startId, $this->endId );
 231                         } elseif ( $this->revStartId || $this->revEndId ) {
 232                                 $exporter->revsByRange( $this->revStartId, $this->revEndId );
 233                         } else {
 234                                 $exporter->allPages();
 235                         }
 236                 # Dump of specific pages
 237                 } else {
 238                         $exporter->pagesByName( $this->pages );
 239                 }
 240
 241                 if ( !$this->skipFooter )
 242                         $exporter->closeStream();
 243
 244                 $this->report( true );
 245         }
 246
 247         /**
 248          * Initialise starting time and maximum revision count.
 249          * We'll make ETA calculations based an progress, assuming relatively
 250          * constant per-revision rate.
 251          * @param $history Integer: WikiExporter::CURRENT or WikiExporter::FULL
 252          */
 253         function initProgress( $history = WikiExporter::FULL ) {
 254                 $table = ( $history == WikiExporter::CURRENT ) ? 'page' : 'revision';
 255                 $field = ( $history == WikiExporter::CURRENT ) ? 'page_id' : 'rev_id';
 256
 257                 $dbr = $this->forcedDb;
 258                 if ( $this->forcedDb === null ) {
 259                         $dbr = wfGetDB( DB_SLAVE );
 260                 }
 261                 $this->maxCount = $dbr->selectField( $table, "MAX($field)", '', __METHOD__ );
 262                 $this->startTime = wfTime();
 263                 $this->lastTime = $this->startTime;
 264                 $this->ID = getmypid();
 265         }
 266
 267         /**
 268          * @todo Fixme: the --server parameter is currently not respected, as it
 269          * doesn't seem terribly easy to ask the load balancer for a particular
 270          * connection by name.
 271          * @return DatabaseBase
 272          */
 273         function backupDb() {
 274                 if ( $this->forcedDb !== null ) {
 275                         return $this->forcedDb;
 276                 }
 277
 278                 $this->lb = wfGetLBFactory()->newMainLB();
 279                 $db = $this->lb->getConnection( DB_SLAVE, 'backup' );
 280
 281                 // Discourage the server from disconnecting us if it takes a long time
 282                 // to read out the big ol' batch query.
 283                 $db->setSessionOptions( array( 'connTimeout' => 3600 * 24 ) );
 284
 285                 return $db;
 286         }
 287
 288         /**
 289          * Force the dump to use the provided database connection for database
 290          * operations, wherever possible.
 291          *
 292          * @param $db DatabaseBase|null: (Optional) the database connection to
 293          *            use. If null, resort to use the globally provided ways to
 294          *            get database connections.
 295          */
 296         function setDb( DatabaseBase $db = null ) {
 297                 $this->forcedDb = $db;
 298         }
 299
 300         function __destruct() {
 301                 if ( isset( $this->lb ) ) {
 302                         $this->lb->closeAll();
 303                 }
 304         }
 305
 306         function backupServer() {
 307                 global $wgDBserver;
 308                 return $this->server
 309                         ? $this->server
 310                         : $wgDBserver;
 311         }
 312
 313         function reportPage() {
 314                 $this->pageCount++;
 315         }
 316
 317         function revCount() {
 318                 $this->revCount++;
 319                 $this->report();
 320         }
 321
 322         function report( $final = false ) {
 323                 if ( $final xor ( $this->revCount % $this->reportingInterval == 0 ) ) {
 324                         $this->showReport();
 325                 }
 326         }
 327
 328         function showReport() {
 329                 if ( $this->reporting ) {
 330                         $now = wfTimestamp( TS_DB );
 331                         $nowts = wfTime();
 332                         $deltaAll = wfTime() - $this->startTime;
 333                         $deltaPart = wfTime() - $this->lastTime;
 334                         $this->pageCountPart = $this->pageCount - $this->pageCountLast;
 335                         $this->revCountPart = $this->revCount - $this->revCountLast;
 336
 337                         if ( $deltaAll ) {
 338                                 $portion = $this->revCount / $this->maxCount;
 339                                 $eta = $this->startTime + $deltaAll / $portion;
 340                                 $etats = wfTimestamp( TS_DB, intval( $eta ) );
 341                                 $pageRate = $this->pageCount / $deltaAll;
 342                                 $revRate = $this->revCount / $deltaAll;
 343                         } else {
 344                                 $pageRate = '-';
 345                                 $revRate = '-';
 346                                 $etats = '-';
 347                         }
 348                         if ( $deltaPart ) {
 349                                 $pageRatePart = $this->pageCountPart / $deltaPart;
 350                                 $revRatePart = $this->revCountPart / $deltaPart;
 351                         } else {
 352                                 $pageRatePart = '-';
 353                                 $revRatePart = '-';
 354                         }
 355                         $this->progress( sprintf( "%s: %s (ID %d) %d pages (%0.1f|%0.1f/sec all|curr), %d revs (%0.1f|%0.1f/sec all|curr), ETA %s [max %d]",
 356                                         $now, wfWikiID(), $this->ID, $this->pageCount, $pageRate, $pageRatePart, $this->revCount, $revRate, $revRatePart, $etats, $this->maxCount ) );
 357                         $this->lastTime = $nowts;
 358                         $this->revCountLast = $this->revCount;
 359                 }
 360         }
 361
 362         function progress( $string ) {
 363                 fwrite( $this->stderr, $string . "\n" );
 364         }
 365
 366         function fatalError( $msg ) {
 367                 $this->progress( "$msg\n" );
 368                 die(1);
 369         }
 370 }
 371
 372 class ExportProgressFilter extends DumpFilter {
 373         function __construct( &$sink, &$progress ) {
 374                 parent::__construct( $sink );
 375                 $this->progress = $progress;
 376         }
 377
 378         function writeClosePage( $string ) {
 379                 parent::writeClosePage( $string );
 380                 $this->progress->reportPage();
 381         }
 382
 383         function writeRevision( $rev, $string ) {
 384                 parent::writeRevision( $rev, $string );
 385                 $this->progress->revCount();
 386         }
 387 }