--- /dev/null
+<?php
+/**
+ * CDN cache purging.
+ *
+ * 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 Cache
+ */
+
+use Wikimedia\Assert\Assert;
+use MediaWiki\MediaWikiServices;
+
+/**
+ * Handles purging appropriate CDN URLs given a title (or titles)
+ * @ingroup Cache
+ */
+class CdnCacheUpdate implements DeferrableUpdate, MergeableUpdate {
+ /** @var string[] Collection of URLs to purge */
+ protected $urls = [];
+
+ /**
+ * @param string[] $urlArr Collection of URLs to purge
+ */
+ public function __construct( array $urlArr ) {
+ $this->urls = $urlArr;
+ }
+
+ public function merge( MergeableUpdate $update ) {
+ /** @var CdnCacheUpdate $update */
+ Assert::parameterType( __CLASS__, $update, '$update' );
+
+ $this->urls = array_merge( $this->urls, $update->urls );
+ }
+
+ /**
+ * Create an update object from an array of Title objects, or a TitleArray object
+ *
+ * @param Traversable|Title[] $titles
+ * @param string[] $urlArr
+ * @return CdnCacheUpdate
+ */
+ public static function newFromTitles( $titles, $urlArr = [] ) {
+ ( new LinkBatch( $titles ) )->execute();
+ /** @var Title $title */
+ foreach ( $titles as $title ) {
+ $urlArr = array_merge( $urlArr, $title->getCdnUrls() );
+ }
+
+ return new CdnCacheUpdate( $urlArr );
+ }
+
+ /**
+ * @param Title $title
+ * @return CdnCacheUpdate
+ * @deprecated since 1.27
+ */
+ public static function newSimplePurge( Title $title ) {
+ return new CdnCacheUpdate( $title->getCdnUrls() );
+ }
+
+ /**
+ * Purges the list of URLs passed to the constructor.
+ */
+ public function doUpdate() {
+ global $wgCdnReboundPurgeDelay;
+
+ self::purge( $this->urls );
+
+ if ( $wgCdnReboundPurgeDelay > 0 ) {
+ JobQueueGroup::singleton()->lazyPush( new CdnPurgeJob(
+ Title::makeTitle( NS_SPECIAL, 'Badtitle/' . __CLASS__ ),
+ [
+ 'urls' => $this->urls,
+ 'jobReleaseTimestamp' => time() + $wgCdnReboundPurgeDelay
+ ]
+ ) );
+ }
+ }
+
+ /**
+ * Purges a list of CDN nodes defined in $wgSquidServers.
+ * $urlArr should contain the full URLs to purge as values
+ * (example: $urlArr[] = 'http://my.host/something')
+ *
+ * @param string[] $urlArr List of full URLs to purge
+ */
+ public static function purge( array $urlArr ) {
+ global $wgSquidServers, $wgHTCPRouting;
+
+ if ( !$urlArr ) {
+ return;
+ }
+
+ // Remove duplicate URLs from list
+ $urlArr = array_unique( $urlArr );
+
+ wfDebugLog( 'squid', __METHOD__ . ': ' . implode( ' ', $urlArr ) );
+
+ // Reliably broadcast the purge to all edge nodes
+ $relayer = MediaWikiServices::getInstance()->getEventRelayerGroup()
+ ->getRelayer( 'cdn-url-purges' );
+ $ts = microtime( true );
+ $relayer->notifyMulti(
+ 'cdn-url-purges',
+ array_map(
+ function ( $url ) use ( $ts ) {
+ return [
+ 'url' => $url,
+ 'timestamp' => $ts,
+ ];
+ },
+ $urlArr
+ )
+ );
+
+ // Send lossy UDP broadcasting if enabled
+ if ( $wgHTCPRouting ) {
+ self::HTCPPurge( $urlArr );
+ }
+
+ // Do direct server purges if enabled (this does not scale very well)
+ if ( $wgSquidServers ) {
+ // Maximum number of parallel connections per squid
+ $maxSocketsPerSquid = 8;
+ // Number of requests to send per socket
+ // 400 seems to be a good tradeoff, opening a socket takes a while
+ $urlsPerSocket = 400;
+ $socketsPerSquid = ceil( count( $urlArr ) / $urlsPerSocket );
+ if ( $socketsPerSquid > $maxSocketsPerSquid ) {
+ $socketsPerSquid = $maxSocketsPerSquid;
+ }
+
+ $pool = new SquidPurgeClientPool;
+ $chunks = array_chunk( $urlArr, ceil( count( $urlArr ) / $socketsPerSquid ) );
+ foreach ( $wgSquidServers as $server ) {
+ foreach ( $chunks as $chunk ) {
+ $client = new SquidPurgeClient( $server );
+ foreach ( $chunk as $url ) {
+ $client->queuePurge( $url );
+ }
+ $pool->addClient( $client );
+ }
+ }
+
+ $pool->run();
+ }
+ }
+
+ /**
+ * Send Hyper Text Caching Protocol (HTCP) CLR requests.
+ *
+ * @throws MWException
+ * @param string[] $urlArr Collection of URLs to purge
+ */
+ private static function HTCPPurge( array $urlArr ) {
+ global $wgHTCPRouting, $wgHTCPMulticastTTL;
+
+ // HTCP CLR operation
+ $htcpOpCLR = 4;
+
+ // @todo FIXME: PHP doesn't support these socket constants (include/linux/in.h)
+ if ( !defined( "IPPROTO_IP" ) ) {
+ define( "IPPROTO_IP", 0 );
+ define( "IP_MULTICAST_LOOP", 34 );
+ define( "IP_MULTICAST_TTL", 33 );
+ }
+
+ // pfsockopen doesn't work because we need set_sock_opt
+ $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
+ if ( !$conn ) {
+ $errstr = socket_strerror( socket_last_error() );
+ wfDebugLog( 'squid', __METHOD__ .
+ ": Error opening UDP socket: $errstr" );
+
+ return;
+ }
+
+ // Set socket options
+ socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_LOOP, 0 );
+ if ( $wgHTCPMulticastTTL != 1 ) {
+ // Set multicast time to live (hop count) option on socket
+ socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_TTL,
+ $wgHTCPMulticastTTL );
+ }
+
+ // Get sequential trx IDs for packet loss counting
+ $ids = UIDGenerator::newSequentialPerNodeIDs(
+ 'squidhtcppurge', 32, count( $urlArr ), UIDGenerator::QUICK_VOLATILE
+ );
+
+ foreach ( $urlArr as $url ) {
+ if ( !is_string( $url ) ) {
+ throw new MWException( 'Bad purge URL' );
+ }
+ $url = self::expand( $url );
+ $conf = self::getRuleForURL( $url, $wgHTCPRouting );
+ if ( !$conf ) {
+ wfDebugLog( 'squid', __METHOD__ .
+ "No HTCP rule configured for URL {$url} , skipping" );
+ continue;
+ }
+
+ if ( isset( $conf['host'] ) && isset( $conf['port'] ) ) {
+ // Normalize single entries
+ $conf = [ $conf ];
+ }
+ foreach ( $conf as $subconf ) {
+ if ( !isset( $subconf['host'] ) || !isset( $subconf['port'] ) ) {
+ throw new MWException( "Invalid HTCP rule for URL $url\n" );
+ }
+ }
+
+ // Construct a minimal HTCP request diagram
+ // as per RFC 2756
+ // Opcode 'CLR', no response desired, no auth
+ $htcpTransID = current( $ids );
+ next( $ids );
+
+ $htcpSpecifier = pack( 'na4na*na8n',
+ 4, 'HEAD', strlen( $url ), $url,
+ 8, 'HTTP/1.0', 0 );
+
+ $htcpDataLen = 8 + 2 + strlen( $htcpSpecifier );
+ $htcpLen = 4 + $htcpDataLen + 2;
+
+ // Note! Squid gets the bit order of the first
+ // word wrong, wrt the RFC. Apparently no other
+ // implementation exists, so adapt to Squid
+ $htcpPacket = pack( 'nxxnCxNxxa*n',
+ $htcpLen, $htcpDataLen, $htcpOpCLR,
+ $htcpTransID, $htcpSpecifier, 2 );
+
+ wfDebugLog( 'squid', __METHOD__ .
+ "Purging URL $url via HTCP" );
+ foreach ( $conf as $subconf ) {
+ socket_sendto( $conn, $htcpPacket, $htcpLen, 0,
+ $subconf['host'], $subconf['port'] );
+ }
+ }
+ }
+
+ /**
+ * Expand local URLs to fully-qualified URLs using the internal protocol
+ * and host defined in $wgInternalServer. Input that's already fully-
+ * qualified will be passed through unchanged.
+ *
+ * This is used to generate purge URLs that may be either local to the
+ * main wiki or include a non-native host, such as images hosted on a
+ * second internal server.
+ *
+ * Client functions should not need to call this.
+ *
+ * @param string $url
+ * @return string
+ */
+ public static function expand( $url ) {
+ return wfExpandUrl( $url, PROTO_INTERNAL );
+ }
+
+ /**
+ * Find the HTCP routing rule to use for a given URL.
+ * @param string $url URL to match
+ * @param array $rules Array of rules, see $wgHTCPRouting for format and behavior
+ * @return mixed Element of $rules that matched, or false if nothing matched
+ */
+ private static function getRuleForURL( $url, $rules ) {
+ foreach ( $rules as $regex => $routing ) {
+ if ( $regex === '' || preg_match( $regex, $url ) ) {
+ return $routing;
+ }
+ }
+
+ return false;
+ }
+}
+
+/**
+ * @deprecated since 1.27
+ */
+class SquidUpdate extends CdnCacheUpdate {
+ // Keep class name for b/c
+}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff