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<?php
/**
* Send purge requests for pages edited in date range to squid/varnish.
*
* 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
* @ingroup Maintenance
*/
require_once __DIR__ . '/Maintenance.php';
/**
* Maintenance script that sends purge requests for pages edited in a date
* range to squid/varnish.
*
* Can be used to recover from an HTCP message partition or other major cache
* layer interruption.
*
* @ingroup Maintenance
*/
class PurgeChangedPages extends Maintenance {
public function __construct() {
parent::__construct();
$this->addDescription( 'Send purge requests for edits in date range to squid/varnish' );
$this->addOption( 'starttime', 'Starting timestamp', true, true );
$this->addOption( 'endtime', 'Ending timestamp', true, true );
$this->addOption( 'htcp-dest', 'HTCP announcement destination (IP:port)', false, true );
$this->addOption( 'sleep-per-batch', 'Milliseconds to sleep between batches', false, true );
$this->addOption( 'dry-run', 'Do not send purge requests' );
$this->addOption( 'verbose', 'Show more output', false, false, 'v' );
$this->setBatchSize( 100 );
}
public function execute() {
global $wgHTCPRouting;
if ( $this->hasOption( 'htcp-dest' ) ) {
$parts = explode( ':', $this->getOption( 'htcp-dest' ) );
if ( count( $parts ) < 2 ) {
// Add default htcp port
$parts[] = '4827';
}
// Route all HTCP messages to provided host:port
$wgHTCPRouting = [
'' => [ 'host' => $parts[0], 'port' => $parts[1] ],
];
if ( $this->hasOption( 'verbose' ) ) {
$this->output( "HTCP broadcasts to {$parts[0]}:{$parts[1]}\n" );
}
}
$dbr = $this->getDB( DB_SLAVE );
$minTime = $dbr->timestamp( $this->getOption( 'starttime' ) );
$maxTime = $dbr->timestamp( $this->getOption( 'endtime' ) );
if ( $maxTime < $minTime ) {
$this->error( "\nERROR: starttime after endtime\n" );
$this->maybeHelp( true );
}
$stuckCount = 0; // loop breaker
while ( true ) {
// Adjust bach size if we are stuck in a second that had many changes
$bSize = $this->mBatchSize + ( $stuckCount * $this->mBatchSize );
$res = $dbr->select(
[ 'page', 'revision' ],
[
'rev_timestamp',
'page_namespace',
'page_title',
],
[
"rev_timestamp > " . $dbr->addQuotes( $minTime ),
"rev_timestamp <= " . $dbr->addQuotes( $maxTime ),
// Only get rows where the revision is the latest for the page.
// Other revisions would be duplicate and we don't need to purge if
// there has been an edit after the interesting time window.
"page_latest = rev_id",
],
__METHOD__,
[ 'ORDER BY' => 'rev_timestamp', 'LIMIT' => $bSize ],
[
'page' => [ 'INNER JOIN', 'rev_page=page_id' ],
]
);
if ( !$res->numRows() ) {
// nothing more found so we are done
break;
}
// Kludge to not get stuck in loops for batches with the same timestamp
list( $rows, $lastTime ) = $this->pageableSortedRows( $res, 'rev_timestamp', $bSize );
if ( !count( $rows ) ) {
++$stuckCount;
continue;
}
// Reset suck counter
$stuckCount = 0;
$this->output( "Processing changes from {$minTime} to {$lastTime}.\n" );
// Advance past the last row next time
$minTime = $lastTime;
// Create list of URLs from page_namespace + page_title
$urls = [];
foreach ( $rows as $row ) {
$title = Title::makeTitle( $row->page_namespace, $row->page_title );
$urls[] = $title->getInternalURL();
}
if ( $this->hasOption( 'dry-run' ) || $this->hasOption( 'verbose' ) ) {
$this->output( implode( "\n", $urls ) . "\n" );
if ( $this->hasOption( 'dry-run' ) ) {
continue;
}
}
// Send batch of purge requests out to squids
$squid = new CdnCacheUpdate( $urls, count( $urls ) );
$squid->doUpdate();
if ( $this->hasOption( 'sleep-per-batch' ) ) {
// sleep-per-batch is milliseconds, usleep wants micro seconds.
usleep( 1000 * (int)$this->getOption( 'sleep-per-batch' ) );
}
}
$this->output( "Done!\n" );
}
/**
* Remove all the rows in a result set with the highest value for column
* $column unless the number of rows is less $limit. This returns the new
* array of rows and the highest value of column $column for the rows left.
* The ordering of rows is maintained.
*
* This is useful for paging on mostly-unique values that may sometimes
* have large clumps of identical values. It should be safe to do the next
* query on items with a value higher than the highest of the rows returned here.
* If this returns an empty array for a non-empty query result, then all the rows
* had the same column value and the query should be repeated with a higher LIMIT.
*
* @todo move this elsewhere
*
* @param ResultWrapper $res Query result sorted by $column (ascending)
* @param string $column
* @param int $limit
* @return array (array of rows, string column value)
*/
protected function pageableSortedRows( ResultWrapper $res, $column, $limit ) {
$rows = iterator_to_array( $res, false );
$count = count( $rows );
if ( !$count ) {
return [ [], null ]; // nothing to do
} elseif ( $count < $limit ) {
return [ $rows, $rows[$count - 1]->$column ]; // no more rows left
}
$lastValue = $rows[$count - 1]->$column; // should be the highest
for ( $i = $count - 1; $i >= 0; --$i ) {
if ( $rows[$i]->$column === $lastValue ) {
unset( $rows[$i] );
} else {
break;
}
}
$lastValueLeft = count( $rows ) ? $rows[count( $rows ) - 1]->$column : null;
return [ $rows, $lastValueLeft ];
}
}
$maintClass = "PurgeChangedPages";
require_once RUN_MAINTENANCE_IF_MAIN;