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+<?php
+/**
+ * Base class for exporting
+ *
+ * Copyright © 2003, 2005, 2006 Brion Vibber <brion@pobox.com>
+ * https://www.mediawiki.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * @defgroup Dump Dump
+ */
+
+use Wikimedia\Rdbms\ResultWrapper;
+use Wikimedia\Rdbms\IDatabase;
+
+/**
+ * @ingroup SpecialPage Dump
+ */
+class WikiExporter {
+ /** @var bool Return distinct author list (when not returning full history) */
+ public $list_authors = false;
+
+ /** @var bool */
+ public $dumpUploads = false;
+
+ /** @var bool */
+ public $dumpUploadFileContents = false;
+
+ /** @var string */
+ public $author_list = "";
+
+ const FULL = 1;
+ const CURRENT = 2;
+ const STABLE = 4; // extension defined
+ const LOGS = 8;
+ const RANGE = 16;
+
+ const BUFFER = 0;
+ const STREAM = 1;
+
+ const TEXT = 0;
+ const STUB = 1;
+
+ /** @var int */
+ public $buffer;
+
+ /** @var int */
+ public $text;
+
+ /** @var DumpOutput */
+ public $sink;
+
+ /**
+ * Returns the export schema version.
+ * @return string
+ */
+ public static function schemaVersion() {
+ return "0.10";
+ }
+
+ /**
+ * If using WikiExporter::STREAM to stream a large amount of data,
+ * provide a database connection which is not managed by
+ * LoadBalancer to read from: some history blob types will
+ * make additional queries to pull source data while the
+ * main query is still running.
+ *
+ * @param IDatabase $db
+ * @param int|array $history One of WikiExporter::FULL, WikiExporter::CURRENT,
+ * WikiExporter::RANGE or WikiExporter::STABLE, or an associative array:
+ * - offset: non-inclusive offset at which to start the query
+ * - limit: maximum number of rows to return
+ * - dir: "asc" or "desc" timestamp order
+ * @param int $buffer One of WikiExporter::BUFFER or WikiExporter::STREAM
+ * @param int $text One of WikiExporter::TEXT or WikiExporter::STUB
+ */
+ function __construct( $db, $history = self::CURRENT,
+ $buffer = self::BUFFER, $text = self::TEXT ) {
+ $this->db = $db;
+ $this->history = $history;
+ $this->buffer = $buffer;
+ $this->writer = new XmlDumpWriter();
+ $this->sink = new DumpOutput();
+ $this->text = $text;
+ }
+
+ /**
+ * Set the DumpOutput or DumpFilter object which will receive
+ * various row objects and XML output for filtering. Filters
+ * can be chained or used as callbacks.
+ *
+ * @param DumpOutput &$sink
+ */
+ public function setOutputSink( &$sink ) {
+ $this->sink =& $sink;
+ }
+
+ public function openStream() {
+ $output = $this->writer->openStream();
+ $this->sink->writeOpenStream( $output );
+ }
+
+ public function closeStream() {
+ $output = $this->writer->closeStream();
+ $this->sink->writeCloseStream( $output );
+ }
+
+ /**
+ * Dumps a series of page and revision records for all pages
+ * in the database, either including complete history or only
+ * the most recent version.
+ */
+ public function allPages() {
+ $this->dumpFrom( '' );
+ }
+
+ /**
+ * Dumps a series of page and revision records for those pages
+ * in the database falling within the page_id range given.
+ * @param int $start Inclusive lower limit (this id is included)
+ * @param int $end Exclusive upper limit (this id is not included)
+ * If 0, no upper limit.
+ * @param bool $orderRevs order revisions within pages in ascending order
+ */
+ public function pagesByRange( $start, $end, $orderRevs ) {
+ if ( $orderRevs ) {
+ $condition = 'rev_page >= ' . intval( $start );
+ if ( $end ) {
+ $condition .= ' AND rev_page < ' . intval( $end );
+ }
+ } else {
+ $condition = 'page_id >= ' . intval( $start );
+ if ( $end ) {
+ $condition .= ' AND page_id < ' . intval( $end );
+ }
+ }
+ $this->dumpFrom( $condition, $orderRevs );
+ }
+
+ /**
+ * Dumps a series of page and revision records for those pages
+ * in the database with revisions falling within the rev_id range given.
+ * @param int $start Inclusive lower limit (this id is included)
+ * @param int $end Exclusive upper limit (this id is not included)
+ * If 0, no upper limit.
+ */
+ public function revsByRange( $start, $end ) {
+ $condition = 'rev_id >= ' . intval( $start );
+ if ( $end ) {
+ $condition .= ' AND rev_id < ' . intval( $end );
+ }
+ $this->dumpFrom( $condition );
+ }
+
+ /**
+ * @param Title $title
+ */
+ public function pageByTitle( $title ) {
+ $this->dumpFrom(
+ 'page_namespace=' . $title->getNamespace() .
+ ' AND page_title=' . $this->db->addQuotes( $title->getDBkey() ) );
+ }
+
+ /**
+ * @param string $name
+ * @throws MWException
+ */
+ public function pageByName( $name ) {
+ $title = Title::newFromText( $name );
+ if ( is_null( $title ) ) {
+ throw new MWException( "Can't export invalid title" );
+ } else {
+ $this->pageByTitle( $title );
+ }
+ }
+
+ /**
+ * @param array $names
+ */
+ public function pagesByName( $names ) {
+ foreach ( $names as $name ) {
+ $this->pageByName( $name );
+ }
+ }
+
+ public function allLogs() {
+ $this->dumpFrom( '' );
+ }
+
+ /**
+ * @param int $start
+ * @param int $end
+ */
+ public function logsByRange( $start, $end ) {
+ $condition = 'log_id >= ' . intval( $start );
+ if ( $end ) {
+ $condition .= ' AND log_id < ' . intval( $end );
+ }
+ $this->dumpFrom( $condition );
+ }
+
+ /**
+ * Generates the distinct list of authors of an article
+ * Not called by default (depends on $this->list_authors)
+ * Can be set by Special:Export when not exporting whole history
+ *
+ * @param array $cond
+ */
+ protected function do_list_authors( $cond ) {
+ $this->author_list = "<contributors>";
+ // rev_deleted
+
+ $revQuery = Revision::getQueryInfo( [ 'page' ] );
+ $res = $this->db->select(
+ $revQuery['tables'],
+ [
+ 'rev_user_text' => $revQuery['fields']['rev_user_text'],
+ 'rev_user' => $revQuery['fields']['rev_user'],
+ ],
+ [
+ $this->db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0',
+ $cond,
+ ],
+ __METHOD__,
+ [ 'DISTINCT' ],
+ $revQuery['joins']
+ );
+
+ foreach ( $res as $row ) {
+ $this->author_list .= "<contributor>" .
+ "<username>" .
+ htmlentities( $row->rev_user_text ) .
+ "</username>" .
+ "<id>" .
+ $row->rev_user .
+ "</id>" .
+ "</contributor>";
+ }
+ $this->author_list .= "</contributors>";
+ }
+
+ /**
+ * @param string $cond
+ * @param bool $orderRevs
+ * @throws MWException
+ * @throws Exception
+ */
+ protected function dumpFrom( $cond = '', $orderRevs = false ) {
+ # For logging dumps...
+ if ( $this->history & self::LOGS ) {
+ $where = [];
+ # Hide private logs
+ $hideLogs = LogEventsList::getExcludeClause( $this->db );
+ if ( $hideLogs ) {
+ $where[] = $hideLogs;
+ }
+ # Add on any caller specified conditions
+ if ( $cond ) {
+ $where[] = $cond;
+ }
+ # Get logging table name for logging.* clause
+ $logging = $this->db->tableName( 'logging' );
+
+ if ( $this->buffer == self::STREAM ) {
+ $prev = $this->db->bufferResults( false );
+ }
+ $result = null; // Assuring $result is not undefined, if exception occurs early
+
+ $commentQuery = CommentStore::getStore()->getJoin( 'log_comment' );
+ $actorQuery = ActorMigration::newMigration()->getJoin( 'log_user' );
+
+ try {
+ $result = $this->db->select(
+ array_merge( [ 'logging' ], $commentQuery['tables'], $actorQuery['tables'], [ 'user' ] ),
+ [ "{$logging}.*", 'user_name' ] + $commentQuery['fields'] + $actorQuery['fields'],
+ $where,
+ __METHOD__,
+ [ 'ORDER BY' => 'log_id', 'USE INDEX' => [ 'logging' => 'PRIMARY' ] ],
+ [
+ 'user' => [ 'JOIN', 'user_id = ' . $actorQuery['fields']['log_user'] ]
+ ] + $commentQuery['joins'] + $actorQuery['joins']
+ );
+ $this->outputLogStream( $result );
+ if ( $this->buffer == self::STREAM ) {
+ $this->db->bufferResults( $prev );
+ }
+ } catch ( Exception $e ) {
+ // Throwing the exception does not reliably free the resultset, and
+ // would also leave the connection in unbuffered mode.
+
+ // Freeing result
+ try {
+ if ( $result ) {
+ $result->free();
+ }
+ } catch ( Exception $e2 ) {
+ // Already in panic mode -> ignoring $e2 as $e has
+ // higher priority
+ }
+
+ // Putting database back in previous buffer mode
+ try {
+ if ( $this->buffer == self::STREAM ) {
+ $this->db->bufferResults( $prev );
+ }
+ } catch ( Exception $e2 ) {
+ // Already in panic mode -> ignoring $e2 as $e has
+ // higher priority
+ }
+
+ // Inform caller about problem
+ throw $e;
+ }
+ # For page dumps...
+ } else {
+ $revOpts = [ 'page' ];
+ if ( $this->text != self::STUB ) {
+ $revOpts[] = 'text';
+ }
+ $revQuery = Revision::getQueryInfo( $revOpts );
+
+ // We want page primary rather than revision
+ $tables = array_merge( [ 'page' ], array_diff( $revQuery['tables'], [ 'page' ] ) );
+ $join = $revQuery['joins'] + [
+ 'revision' => $revQuery['joins']['page']
+ ];
+ unset( $join['page'] );
+
+ $fields = array_merge( $revQuery['fields'], [ 'page_restrictions' ] );
+
+ $conds = [];
+ if ( $cond !== '' ) {
+ $conds[] = $cond;
+ }
+ $opts = [ 'ORDER BY' => 'page_id ASC' ];
+ $opts['USE INDEX'] = [];
+ if ( is_array( $this->history ) ) {
+ # Time offset/limit for all pages/history...
+ # Set time order
+ if ( $this->history['dir'] == 'asc' ) {
+ $op = '>';
+ $opts['ORDER BY'] = 'rev_timestamp ASC';
+ } else {
+ $op = '<';
+ $opts['ORDER BY'] = 'rev_timestamp DESC';
+ }
+ # Set offset
+ if ( !empty( $this->history['offset'] ) ) {
+ $conds[] = "rev_timestamp $op " .
+ $this->db->addQuotes( $this->db->timestamp( $this->history['offset'] ) );
+ }
+ # Set query limit
+ if ( !empty( $this->history['limit'] ) ) {
+ $opts['LIMIT'] = intval( $this->history['limit'] );
+ }
+ } elseif ( $this->history & self::FULL ) {
+ # Full history dumps...
+ # query optimization for history stub dumps
+ if ( $this->text == self::STUB && $orderRevs ) {
+ $tables = $revQuery['tables'];
+ $opts['ORDER BY'] = [ 'rev_page ASC', 'rev_id ASC' ];
+ $opts['USE INDEX']['revision'] = 'rev_page_id';
+ unset( $join['revision'] );
+ $join['page'] = [ 'INNER JOIN', 'rev_page=page_id' ];
+ }
+ } elseif ( $this->history & self::CURRENT ) {
+ # Latest revision dumps...
+ if ( $this->list_authors && $cond != '' ) { // List authors, if so desired
+ $this->do_list_authors( $cond );
+ }
+ $join['revision'] = [ 'INNER JOIN', 'page_id=rev_page AND page_latest=rev_id' ];
+ } elseif ( $this->history & self::STABLE ) {
+ # "Stable" revision dumps...
+ # Default JOIN, to be overridden...
+ $join['revision'] = [ 'INNER JOIN', 'page_id=rev_page AND page_latest=rev_id' ];
+ # One, and only one hook should set this, and return false
+ if ( Hooks::run( 'WikiExporter::dumpStableQuery', [ &$tables, &$opts, &$join ] ) ) {
+ throw new MWException( __METHOD__ . " given invalid history dump type." );
+ }
+ } elseif ( $this->history & self::RANGE ) {
+ # Dump of revisions within a specified range
+ $opts['ORDER BY'] = [ 'rev_page ASC', 'rev_id ASC' ];
+ } else {
+ # Unknown history specification parameter?
+ throw new MWException( __METHOD__ . " given invalid history dump type." );
+ }
+
+ if ( $this->buffer == self::STREAM ) {
+ $prev = $this->db->bufferResults( false );
+ }
+ $result = null; // Assuring $result is not undefined, if exception occurs early
+ try {
+ Hooks::run( 'ModifyExportQuery',
+ [ $this->db, &$tables, &$cond, &$opts, &$join ] );
+
+ # Do the query!
+ $result = $this->db->select(
+ $tables,
+ $fields,
+ $conds,
+ __METHOD__,
+ $opts,
+ $join
+ );
+ # Output dump results
+ $this->outputPageStream( $result );
+
+ if ( $this->buffer == self::STREAM ) {
+ $this->db->bufferResults( $prev );
+ }
+ } catch ( Exception $e ) {
+ // Throwing the exception does not reliably free the resultset, and
+ // would also leave the connection in unbuffered mode.
+
+ // Freeing result
+ try {
+ if ( $result ) {
+ $result->free();
+ }
+ } catch ( Exception $e2 ) {
+ // Already in panic mode -> ignoring $e2 as $e has
+ // higher priority
+ }
+
+ // Putting database back in previous buffer mode
+ try {
+ if ( $this->buffer == self::STREAM ) {
+ $this->db->bufferResults( $prev );
+ }
+ } catch ( Exception $e2 ) {
+ // Already in panic mode -> ignoring $e2 as $e has
+ // higher priority
+ }
+
+ // Inform caller about problem
+ throw $e;
+ }
+ }
+ }
+
+ /**
+ * Runs through a query result set dumping page and revision records.
+ * The result set should be sorted/grouped by page to avoid duplicate
+ * page records in the output.
+ *
+ * Should be safe for
+ * streaming (non-buffered) queries, as long as it was made on a
+ * separate database connection not managed by LoadBalancer; some
+ * blob storage types will make queries to pull source data.
+ *
+ * @param ResultWrapper $resultset
+ */
+ protected function outputPageStream( $resultset ) {
+ $last = null;
+ foreach ( $resultset as $row ) {
+ if ( $last === null ||
+ $last->page_namespace != $row->page_namespace ||
+ $last->page_title != $row->page_title ) {
+ if ( $last !== null ) {
+ $output = '';
+ if ( $this->dumpUploads ) {
+ $output .= $this->writer->writeUploads( $last, $this->dumpUploadFileContents );
+ }
+ $output .= $this->writer->closePage();
+ $this->sink->writeClosePage( $output );
+ }
+ $output = $this->writer->openPage( $row );
+ $this->sink->writeOpenPage( $row, $output );
+ $last = $row;
+ }
+ $output = $this->writer->writeRevision( $row );
+ $this->sink->writeRevision( $row, $output );
+ }
+ if ( $last !== null ) {
+ $output = '';
+ if ( $this->dumpUploads ) {
+ $output .= $this->writer->writeUploads( $last, $this->dumpUploadFileContents );
+ }
+ $output .= $this->author_list;
+ $output .= $this->writer->closePage();
+ $this->sink->writeClosePage( $output );
+ }
+ }
+
+ /**
+ * @param ResultWrapper $resultset
+ */
+ protected function outputLogStream( $resultset ) {
+ foreach ( $resultset as $row ) {
+ $output = $this->writer->writeLogItem( $row );
+ $this->sink->writeLogItem( $row, $output );
+ }
+ }
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-04 20:46:15 +0000