835 lines
24 KiB
PHP
835 lines
24 KiB
PHP
<?php
|
|
/**
|
|
* Object caching using a SQL database.
|
|
*
|
|
* 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\Rdbms\Database;
|
|
use Wikimedia\Rdbms\IDatabase;
|
|
use Wikimedia\Rdbms\DBError;
|
|
use Wikimedia\Rdbms\DBQueryError;
|
|
use Wikimedia\Rdbms\DBConnectionError;
|
|
use \MediaWiki\MediaWikiServices;
|
|
use \Wikimedia\WaitConditionLoop;
|
|
use \Wikimedia\Rdbms\TransactionProfiler;
|
|
use Wikimedia\Rdbms\LoadBalancer;
|
|
|
|
/**
|
|
* Class to store objects in the database
|
|
*
|
|
* @ingroup Cache
|
|
*/
|
|
class SqlBagOStuff extends BagOStuff {
|
|
/** @var array[] (server index => server config) */
|
|
protected $serverInfos;
|
|
/** @var string[] (server index => tag/host name) */
|
|
protected $serverTags;
|
|
/** @var int */
|
|
protected $numServers;
|
|
/** @var int */
|
|
protected $lastExpireAll = 0;
|
|
/** @var int */
|
|
protected $purgePeriod = 100;
|
|
/** @var int */
|
|
protected $shards = 1;
|
|
/** @var string */
|
|
protected $tableName = 'objectcache';
|
|
/** @var bool */
|
|
protected $replicaOnly = false;
|
|
/** @var int */
|
|
protected $syncTimeout = 3;
|
|
|
|
/** @var LoadBalancer|null */
|
|
protected $separateMainLB;
|
|
/** @var array */
|
|
protected $conns;
|
|
/** @var array UNIX timestamps */
|
|
protected $connFailureTimes = [];
|
|
/** @var array Exceptions */
|
|
protected $connFailureErrors = [];
|
|
|
|
/**
|
|
* Constructor. Parameters are:
|
|
* - server: A server info structure in the format required by each
|
|
* element in $wgDBServers.
|
|
*
|
|
* - servers: An array of server info structures describing a set of database servers
|
|
* to distribute keys to. If this is specified, the "server" option will be
|
|
* ignored. If string keys are used, then they will be used for consistent
|
|
* hashing *instead* of the host name (from the server config). This is useful
|
|
* when a cluster is replicated to another site (with different host names)
|
|
* but each server has a corresponding replica in the other cluster.
|
|
*
|
|
* - purgePeriod: The average number of object cache requests in between
|
|
* garbage collection operations, where expired entries
|
|
* are removed from the database. Or in other words, the
|
|
* reciprocal of the probability of purging on any given
|
|
* request. If this is set to zero, purging will never be
|
|
* done.
|
|
*
|
|
* - tableName: The table name to use, default is "objectcache".
|
|
*
|
|
* - shards: The number of tables to use for data storage on each server.
|
|
* If this is more than 1, table names will be formed in the style
|
|
* objectcacheNNN where NNN is the shard index, between 0 and
|
|
* shards-1. The number of digits will be the minimum number
|
|
* required to hold the largest shard index. Data will be
|
|
* distributed across all tables by key hash. This is for
|
|
* MySQL bugs 61735 and 61736.
|
|
* - slaveOnly: Whether to only use replica DBs and avoid triggering
|
|
* garbage collection logic of expired items. This only
|
|
* makes sense if the primary DB is used and only if get()
|
|
* calls will be used. This is used by ReplicatedBagOStuff.
|
|
* - syncTimeout: Max seconds to wait for replica DBs to catch up for WRITE_SYNC.
|
|
*
|
|
* @param array $params
|
|
*/
|
|
public function __construct( $params ) {
|
|
parent::__construct( $params );
|
|
|
|
$this->attrMap[self::ATTR_EMULATION] = self::QOS_EMULATION_SQL;
|
|
$this->attrMap[self::ATTR_SYNCWRITES] = self::QOS_SYNCWRITES_NONE;
|
|
|
|
if ( isset( $params['servers'] ) ) {
|
|
$this->serverInfos = [];
|
|
$this->serverTags = [];
|
|
$this->numServers = count( $params['servers'] );
|
|
$index = 0;
|
|
foreach ( $params['servers'] as $tag => $info ) {
|
|
$this->serverInfos[$index] = $info;
|
|
if ( is_string( $tag ) ) {
|
|
$this->serverTags[$index] = $tag;
|
|
} else {
|
|
$this->serverTags[$index] = isset( $info['host'] ) ? $info['host'] : "#$index";
|
|
}
|
|
++$index;
|
|
}
|
|
} elseif ( isset( $params['server'] ) ) {
|
|
$this->serverInfos = [ $params['server'] ];
|
|
$this->numServers = count( $this->serverInfos );
|
|
} else {
|
|
// Default to using the main wiki's database servers
|
|
$this->serverInfos = false;
|
|
$this->numServers = 1;
|
|
$this->attrMap[self::ATTR_SYNCWRITES] = self::QOS_SYNCWRITES_BE;
|
|
}
|
|
if ( isset( $params['purgePeriod'] ) ) {
|
|
$this->purgePeriod = intval( $params['purgePeriod'] );
|
|
}
|
|
if ( isset( $params['tableName'] ) ) {
|
|
$this->tableName = $params['tableName'];
|
|
}
|
|
if ( isset( $params['shards'] ) ) {
|
|
$this->shards = intval( $params['shards'] );
|
|
}
|
|
if ( isset( $params['syncTimeout'] ) ) {
|
|
$this->syncTimeout = $params['syncTimeout'];
|
|
}
|
|
$this->replicaOnly = !empty( $params['slaveOnly'] );
|
|
}
|
|
|
|
protected function getSeparateMainLB() {
|
|
global $wgDBtype;
|
|
|
|
if ( $this->usesMainDB() && $wgDBtype !== 'sqlite' ) {
|
|
if ( !$this->separateMainLB ) {
|
|
// We must keep a separate connection to MySQL in order to avoid deadlocks
|
|
$lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
|
|
$this->separateMainLB = $lbFactory->newMainLB();
|
|
}
|
|
return $this->separateMainLB;
|
|
} else {
|
|
// However, SQLite has an opposite behavior due to DB-level locking
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a connection to the specified database
|
|
*
|
|
* @param int $serverIndex
|
|
* @return IDatabase
|
|
* @throws MWException
|
|
*/
|
|
protected function getDB( $serverIndex ) {
|
|
if ( !isset( $this->conns[$serverIndex] ) ) {
|
|
if ( $serverIndex >= $this->numServers ) {
|
|
throw new MWException( __METHOD__ . ": Invalid server index \"$serverIndex\"" );
|
|
}
|
|
|
|
# Don't keep timing out trying to connect for each call if the DB is down
|
|
if ( isset( $this->connFailureErrors[$serverIndex] )
|
|
&& ( time() - $this->connFailureTimes[$serverIndex] ) < 60
|
|
) {
|
|
throw $this->connFailureErrors[$serverIndex];
|
|
}
|
|
|
|
# If server connection info was given, use that
|
|
if ( $this->serverInfos ) {
|
|
$info = $this->serverInfos[$serverIndex];
|
|
$type = isset( $info['type'] ) ? $info['type'] : 'mysql';
|
|
$host = isset( $info['host'] ) ? $info['host'] : '[unknown]';
|
|
$this->logger->debug( __CLASS__ . ": connecting to $host" );
|
|
// Use a blank trx profiler to ignore expections as this is a cache
|
|
$info['trxProfiler'] = new TransactionProfiler();
|
|
$db = Database::factory( $type, $info );
|
|
$db->clearFlag( DBO_TRX );
|
|
} else {
|
|
$index = $this->replicaOnly ? DB_REPLICA : DB_MASTER;
|
|
if ( $this->getSeparateMainLB() ) {
|
|
$db = $this->getSeparateMainLB()->getConnection( $index );
|
|
$db->clearFlag( DBO_TRX ); // auto-commit mode
|
|
} else {
|
|
$db = wfGetDB( $index );
|
|
// Can't mess with transaction rounds (DBO_TRX) :(
|
|
}
|
|
}
|
|
$this->logger->debug( sprintf( "Connection %s will be used for SqlBagOStuff", $db ) );
|
|
$this->conns[$serverIndex] = $db;
|
|
}
|
|
|
|
return $this->conns[$serverIndex];
|
|
}
|
|
|
|
/**
|
|
* Get the server index and table name for a given key
|
|
* @param string $key
|
|
* @return array Server index and table name
|
|
*/
|
|
protected function getTableByKey( $key ) {
|
|
if ( $this->shards > 1 ) {
|
|
$hash = hexdec( substr( md5( $key ), 0, 8 ) ) & 0x7fffffff;
|
|
$tableIndex = $hash % $this->shards;
|
|
} else {
|
|
$tableIndex = 0;
|
|
}
|
|
if ( $this->numServers > 1 ) {
|
|
$sortedServers = $this->serverTags;
|
|
ArrayUtils::consistentHashSort( $sortedServers, $key );
|
|
reset( $sortedServers );
|
|
$serverIndex = key( $sortedServers );
|
|
} else {
|
|
$serverIndex = 0;
|
|
}
|
|
return [ $serverIndex, $this->getTableNameByShard( $tableIndex ) ];
|
|
}
|
|
|
|
/**
|
|
* Get the table name for a given shard index
|
|
* @param int $index
|
|
* @return string
|
|
*/
|
|
protected function getTableNameByShard( $index ) {
|
|
if ( $this->shards > 1 ) {
|
|
$decimals = strlen( $this->shards - 1 );
|
|
return $this->tableName .
|
|
sprintf( "%0{$decimals}d", $index );
|
|
} else {
|
|
return $this->tableName;
|
|
}
|
|
}
|
|
|
|
protected function doGet( $key, $flags = 0 ) {
|
|
$casToken = null;
|
|
|
|
return $this->getWithToken( $key, $casToken, $flags );
|
|
}
|
|
|
|
protected function getWithToken( $key, &$casToken, $flags = 0 ) {
|
|
$values = $this->getMulti( [ $key ] );
|
|
if ( array_key_exists( $key, $values ) ) {
|
|
$casToken = $values[$key];
|
|
return $values[$key];
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public function getMulti( array $keys, $flags = 0 ) {
|
|
$values = []; // array of (key => value)
|
|
|
|
$keysByTable = [];
|
|
foreach ( $keys as $key ) {
|
|
list( $serverIndex, $tableName ) = $this->getTableByKey( $key );
|
|
$keysByTable[$serverIndex][$tableName][] = $key;
|
|
}
|
|
|
|
$this->garbageCollect(); // expire old entries if any
|
|
|
|
$dataRows = [];
|
|
foreach ( $keysByTable as $serverIndex => $serverKeys ) {
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
foreach ( $serverKeys as $tableName => $tableKeys ) {
|
|
$res = $db->select( $tableName,
|
|
[ 'keyname', 'value', 'exptime' ],
|
|
[ 'keyname' => $tableKeys ],
|
|
__METHOD__,
|
|
// Approximate write-on-the-fly BagOStuff API via blocking.
|
|
// This approximation fails if a ROLLBACK happens (which is rare).
|
|
// We do not want to flush the TRX as that can break callers.
|
|
$db->trxLevel() ? [ 'LOCK IN SHARE MODE' ] : []
|
|
);
|
|
if ( $res === false ) {
|
|
continue;
|
|
}
|
|
foreach ( $res as $row ) {
|
|
$row->serverIndex = $serverIndex;
|
|
$row->tableName = $tableName;
|
|
$dataRows[$row->keyname] = $row;
|
|
}
|
|
}
|
|
} catch ( DBError $e ) {
|
|
$this->handleReadError( $e, $serverIndex );
|
|
}
|
|
}
|
|
|
|
foreach ( $keys as $key ) {
|
|
if ( isset( $dataRows[$key] ) ) { // HIT?
|
|
$row = $dataRows[$key];
|
|
$this->debug( "get: retrieved data; expiry time is " . $row->exptime );
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $row->serverIndex );
|
|
if ( $this->isExpired( $db, $row->exptime ) ) { // MISS
|
|
$this->debug( "get: key has expired" );
|
|
} else { // HIT
|
|
$values[$key] = $this->unserialize( $db->decodeBlob( $row->value ) );
|
|
}
|
|
} catch ( DBQueryError $e ) {
|
|
$this->handleWriteError( $e, $db, $row->serverIndex );
|
|
}
|
|
} else { // MISS
|
|
$this->debug( 'get: no matching rows' );
|
|
}
|
|
}
|
|
|
|
return $values;
|
|
}
|
|
|
|
public function setMulti( array $data, $expiry = 0 ) {
|
|
$keysByTable = [];
|
|
foreach ( $data as $key => $value ) {
|
|
list( $serverIndex, $tableName ) = $this->getTableByKey( $key );
|
|
$keysByTable[$serverIndex][$tableName][] = $key;
|
|
}
|
|
|
|
$this->garbageCollect(); // expire old entries if any
|
|
|
|
$result = true;
|
|
$exptime = (int)$expiry;
|
|
foreach ( $keysByTable as $serverIndex => $serverKeys ) {
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
$result = false;
|
|
continue;
|
|
}
|
|
|
|
if ( $exptime < 0 ) {
|
|
$exptime = 0;
|
|
}
|
|
|
|
if ( $exptime == 0 ) {
|
|
$encExpiry = $this->getMaxDateTime( $db );
|
|
} else {
|
|
$exptime = $this->convertExpiry( $exptime );
|
|
$encExpiry = $db->timestamp( $exptime );
|
|
}
|
|
foreach ( $serverKeys as $tableName => $tableKeys ) {
|
|
$rows = [];
|
|
foreach ( $tableKeys as $key ) {
|
|
$rows[] = [
|
|
'keyname' => $key,
|
|
'value' => $db->encodeBlob( $this->serialize( $data[$key] ) ),
|
|
'exptime' => $encExpiry,
|
|
];
|
|
}
|
|
|
|
try {
|
|
$db->replace(
|
|
$tableName,
|
|
[ 'keyname' ],
|
|
$rows,
|
|
__METHOD__
|
|
);
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
$result = false;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
public function set( $key, $value, $exptime = 0, $flags = 0 ) {
|
|
$ok = $this->setMulti( [ $key => $value ], $exptime );
|
|
if ( ( $flags & self::WRITE_SYNC ) == self::WRITE_SYNC ) {
|
|
$ok = $this->waitForReplication() && $ok;
|
|
}
|
|
|
|
return $ok;
|
|
}
|
|
|
|
protected function cas( $casToken, $key, $value, $exptime = 0 ) {
|
|
list( $serverIndex, $tableName ) = $this->getTableByKey( $key );
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
$exptime = intval( $exptime );
|
|
|
|
if ( $exptime < 0 ) {
|
|
$exptime = 0;
|
|
}
|
|
|
|
if ( $exptime == 0 ) {
|
|
$encExpiry = $this->getMaxDateTime( $db );
|
|
} else {
|
|
$exptime = $this->convertExpiry( $exptime );
|
|
$encExpiry = $db->timestamp( $exptime );
|
|
}
|
|
// (T26425) use a replace if the db supports it instead of
|
|
// delete/insert to avoid clashes with conflicting keynames
|
|
$db->update(
|
|
$tableName,
|
|
[
|
|
'keyname' => $key,
|
|
'value' => $db->encodeBlob( $this->serialize( $value ) ),
|
|
'exptime' => $encExpiry
|
|
],
|
|
[
|
|
'keyname' => $key,
|
|
'value' => $db->encodeBlob( $this->serialize( $casToken ) )
|
|
],
|
|
__METHOD__
|
|
);
|
|
} catch ( DBQueryError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
|
|
return false;
|
|
}
|
|
|
|
return (bool)$db->affectedRows();
|
|
}
|
|
|
|
public function delete( $key ) {
|
|
list( $serverIndex, $tableName ) = $this->getTableByKey( $key );
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
$db->delete(
|
|
$tableName,
|
|
[ 'keyname' => $key ],
|
|
__METHOD__ );
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public function incr( $key, $step = 1 ) {
|
|
list( $serverIndex, $tableName ) = $this->getTableByKey( $key );
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
$step = intval( $step );
|
|
$row = $db->selectRow(
|
|
$tableName,
|
|
[ 'value', 'exptime' ],
|
|
[ 'keyname' => $key ],
|
|
__METHOD__,
|
|
[ 'FOR UPDATE' ] );
|
|
if ( $row === false ) {
|
|
// Missing
|
|
|
|
return null;
|
|
}
|
|
$db->delete( $tableName, [ 'keyname' => $key ], __METHOD__ );
|
|
if ( $this->isExpired( $db, $row->exptime ) ) {
|
|
// Expired, do not reinsert
|
|
|
|
return null;
|
|
}
|
|
|
|
$oldValue = intval( $this->unserialize( $db->decodeBlob( $row->value ) ) );
|
|
$newValue = $oldValue + $step;
|
|
$db->insert( $tableName,
|
|
[
|
|
'keyname' => $key,
|
|
'value' => $db->encodeBlob( $this->serialize( $newValue ) ),
|
|
'exptime' => $row->exptime
|
|
], __METHOD__, 'IGNORE' );
|
|
|
|
if ( $db->affectedRows() == 0 ) {
|
|
// Race condition. See T30611
|
|
$newValue = null;
|
|
}
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
return null;
|
|
}
|
|
|
|
return $newValue;
|
|
}
|
|
|
|
public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
|
|
$ok = $this->mergeViaCas( $key, $callback, $exptime, $attempts );
|
|
if ( ( $flags & self::WRITE_SYNC ) == self::WRITE_SYNC ) {
|
|
$ok = $this->waitForReplication() && $ok;
|
|
}
|
|
|
|
return $ok;
|
|
}
|
|
|
|
public function changeTTL( $key, $expiry = 0 ) {
|
|
list( $serverIndex, $tableName ) = $this->getTableByKey( $key );
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
$db->update(
|
|
$tableName,
|
|
[ 'exptime' => $db->timestamp( $this->convertExpiry( $expiry ) ) ],
|
|
[ 'keyname' => $key, 'exptime > ' . $db->addQuotes( $db->timestamp( time() ) ) ],
|
|
__METHOD__
|
|
);
|
|
if ( $db->affectedRows() == 0 ) {
|
|
return false;
|
|
}
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @param IDatabase $db
|
|
* @param string $exptime
|
|
* @return bool
|
|
*/
|
|
protected function isExpired( $db, $exptime ) {
|
|
return $exptime != $this->getMaxDateTime( $db ) && wfTimestamp( TS_UNIX, $exptime ) < time();
|
|
}
|
|
|
|
/**
|
|
* @param IDatabase $db
|
|
* @return string
|
|
*/
|
|
protected function getMaxDateTime( $db ) {
|
|
if ( time() > 0x7fffffff ) {
|
|
return $db->timestamp( 1 << 62 );
|
|
} else {
|
|
return $db->timestamp( 0x7fffffff );
|
|
}
|
|
}
|
|
|
|
protected function garbageCollect() {
|
|
if ( !$this->purgePeriod || $this->replicaOnly ) {
|
|
// Disabled
|
|
return;
|
|
}
|
|
// Only purge on one in every $this->purgePeriod requests.
|
|
if ( $this->purgePeriod !== 1 && mt_rand( 0, $this->purgePeriod - 1 ) ) {
|
|
return;
|
|
}
|
|
$now = time();
|
|
// Avoid repeating the delete within a few seconds
|
|
if ( $now > ( $this->lastExpireAll + 1 ) ) {
|
|
$this->lastExpireAll = $now;
|
|
$this->expireAll();
|
|
}
|
|
}
|
|
|
|
public function expireAll() {
|
|
$this->deleteObjectsExpiringBefore( wfTimestampNow() );
|
|
}
|
|
|
|
/**
|
|
* Delete objects from the database which expire before a certain date.
|
|
* @param string $timestamp
|
|
* @param bool|callable $progressCallback
|
|
* @return bool
|
|
*/
|
|
public function deleteObjectsExpiringBefore( $timestamp, $progressCallback = false ) {
|
|
for ( $serverIndex = 0; $serverIndex < $this->numServers; $serverIndex++ ) {
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
$dbTimestamp = $db->timestamp( $timestamp );
|
|
$totalSeconds = false;
|
|
$baseConds = [ 'exptime < ' . $db->addQuotes( $dbTimestamp ) ];
|
|
for ( $i = 0; $i < $this->shards; $i++ ) {
|
|
$maxExpTime = false;
|
|
while ( true ) {
|
|
$conds = $baseConds;
|
|
if ( $maxExpTime !== false ) {
|
|
$conds[] = 'exptime >= ' . $db->addQuotes( $maxExpTime );
|
|
}
|
|
$rows = $db->select(
|
|
$this->getTableNameByShard( $i ),
|
|
[ 'keyname', 'exptime' ],
|
|
$conds,
|
|
__METHOD__,
|
|
[ 'LIMIT' => 100, 'ORDER BY' => 'exptime' ] );
|
|
if ( $rows === false || !$rows->numRows() ) {
|
|
break;
|
|
}
|
|
$keys = [];
|
|
$row = $rows->current();
|
|
$minExpTime = $row->exptime;
|
|
if ( $totalSeconds === false ) {
|
|
$totalSeconds = wfTimestamp( TS_UNIX, $timestamp )
|
|
- wfTimestamp( TS_UNIX, $minExpTime );
|
|
}
|
|
foreach ( $rows as $row ) {
|
|
$keys[] = $row->keyname;
|
|
$maxExpTime = $row->exptime;
|
|
}
|
|
|
|
$db->delete(
|
|
$this->getTableNameByShard( $i ),
|
|
[
|
|
'exptime >= ' . $db->addQuotes( $minExpTime ),
|
|
'exptime < ' . $db->addQuotes( $dbTimestamp ),
|
|
'keyname' => $keys
|
|
],
|
|
__METHOD__ );
|
|
|
|
if ( $progressCallback ) {
|
|
if ( intval( $totalSeconds ) === 0 ) {
|
|
$percent = 0;
|
|
} else {
|
|
$remainingSeconds = wfTimestamp( TS_UNIX, $timestamp )
|
|
- wfTimestamp( TS_UNIX, $maxExpTime );
|
|
if ( $remainingSeconds > $totalSeconds ) {
|
|
$totalSeconds = $remainingSeconds;
|
|
}
|
|
$processedSeconds = $totalSeconds - $remainingSeconds;
|
|
$percent = ( $i + $processedSeconds / $totalSeconds )
|
|
/ $this->shards * 100;
|
|
}
|
|
$percent = ( $percent / $this->numServers )
|
|
+ ( $serverIndex / $this->numServers * 100 );
|
|
call_user_func( $progressCallback, $percent );
|
|
}
|
|
}
|
|
}
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Delete content of shard tables in every server.
|
|
* Return true if the operation is successful, false otherwise.
|
|
* @return bool
|
|
*/
|
|
public function deleteAll() {
|
|
for ( $serverIndex = 0; $serverIndex < $this->numServers; $serverIndex++ ) {
|
|
$db = null;
|
|
try {
|
|
$db = $this->getDB( $serverIndex );
|
|
for ( $i = 0; $i < $this->shards; $i++ ) {
|
|
$db->delete( $this->getTableNameByShard( $i ), '*', __METHOD__ );
|
|
}
|
|
} catch ( DBError $e ) {
|
|
$this->handleWriteError( $e, $db, $serverIndex );
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Serialize an object and, if possible, compress the representation.
|
|
* On typical message and page data, this can provide a 3X decrease
|
|
* in storage requirements.
|
|
*
|
|
* @param mixed &$data
|
|
* @return string
|
|
*/
|
|
protected function serialize( &$data ) {
|
|
$serial = serialize( $data );
|
|
|
|
if ( function_exists( 'gzdeflate' ) ) {
|
|
return gzdeflate( $serial );
|
|
} else {
|
|
return $serial;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Unserialize and, if necessary, decompress an object.
|
|
* @param string $serial
|
|
* @return mixed
|
|
*/
|
|
protected function unserialize( $serial ) {
|
|
if ( function_exists( 'gzinflate' ) ) {
|
|
MediaWiki\suppressWarnings();
|
|
$decomp = gzinflate( $serial );
|
|
MediaWiki\restoreWarnings();
|
|
|
|
if ( false !== $decomp ) {
|
|
$serial = $decomp;
|
|
}
|
|
}
|
|
|
|
$ret = unserialize( $serial );
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Handle a DBError which occurred during a read operation.
|
|
*
|
|
* @param DBError $exception
|
|
* @param int $serverIndex
|
|
*/
|
|
protected function handleReadError( DBError $exception, $serverIndex ) {
|
|
if ( $exception instanceof DBConnectionError ) {
|
|
$this->markServerDown( $exception, $serverIndex );
|
|
}
|
|
$this->logger->error( "DBError: {$exception->getMessage()}" );
|
|
if ( $exception instanceof DBConnectionError ) {
|
|
$this->setLastError( BagOStuff::ERR_UNREACHABLE );
|
|
$this->logger->debug( __METHOD__ . ": ignoring connection error" );
|
|
} else {
|
|
$this->setLastError( BagOStuff::ERR_UNEXPECTED );
|
|
$this->logger->debug( __METHOD__ . ": ignoring query error" );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle a DBQueryError which occurred during a write operation.
|
|
*
|
|
* @param DBError $exception
|
|
* @param IDatabase|null $db DB handle or null if connection failed
|
|
* @param int $serverIndex
|
|
* @throws Exception
|
|
*/
|
|
protected function handleWriteError( DBError $exception, IDatabase $db = null, $serverIndex ) {
|
|
if ( !$db ) {
|
|
$this->markServerDown( $exception, $serverIndex );
|
|
} elseif ( $db->wasReadOnlyError() ) {
|
|
if ( $db->trxLevel() && $this->usesMainDB() ) {
|
|
// Errors like deadlocks and connection drops already cause rollback.
|
|
// For consistency, we have no choice but to throw an error and trigger
|
|
// complete rollback if the main DB is also being used as the cache DB.
|
|
throw $exception;
|
|
}
|
|
}
|
|
|
|
$this->logger->error( "DBError: {$exception->getMessage()}" );
|
|
if ( $exception instanceof DBConnectionError ) {
|
|
$this->setLastError( BagOStuff::ERR_UNREACHABLE );
|
|
$this->logger->debug( __METHOD__ . ": ignoring connection error" );
|
|
} else {
|
|
$this->setLastError( BagOStuff::ERR_UNEXPECTED );
|
|
$this->logger->debug( __METHOD__ . ": ignoring query error" );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Mark a server down due to a DBConnectionError exception
|
|
*
|
|
* @param DBError $exception
|
|
* @param int $serverIndex
|
|
*/
|
|
protected function markServerDown( DBError $exception, $serverIndex ) {
|
|
unset( $this->conns[$serverIndex] ); // bug T103435
|
|
|
|
if ( isset( $this->connFailureTimes[$serverIndex] ) ) {
|
|
if ( time() - $this->connFailureTimes[$serverIndex] >= 60 ) {
|
|
unset( $this->connFailureTimes[$serverIndex] );
|
|
unset( $this->connFailureErrors[$serverIndex] );
|
|
} else {
|
|
$this->logger->debug( __METHOD__ . ": Server #$serverIndex already down" );
|
|
return;
|
|
}
|
|
}
|
|
$now = time();
|
|
$this->logger->info( __METHOD__ . ": Server #$serverIndex down until " . ( $now + 60 ) );
|
|
$this->connFailureTimes[$serverIndex] = $now;
|
|
$this->connFailureErrors[$serverIndex] = $exception;
|
|
}
|
|
|
|
/**
|
|
* Create shard tables. For use from eval.php.
|
|
*/
|
|
public function createTables() {
|
|
for ( $serverIndex = 0; $serverIndex < $this->numServers; $serverIndex++ ) {
|
|
$db = $this->getDB( $serverIndex );
|
|
if ( $db->getType() !== 'mysql' ) {
|
|
throw new MWException( __METHOD__ . ' is not supported on this DB server' );
|
|
}
|
|
|
|
for ( $i = 0; $i < $this->shards; $i++ ) {
|
|
$db->query(
|
|
'CREATE TABLE ' . $db->tableName( $this->getTableNameByShard( $i ) ) .
|
|
' LIKE ' . $db->tableName( 'objectcache' ),
|
|
__METHOD__ );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return bool Whether the main DB is used, e.g. wfGetDB( DB_MASTER )
|
|
*/
|
|
protected function usesMainDB() {
|
|
return !$this->serverInfos;
|
|
}
|
|
|
|
protected function waitForReplication() {
|
|
if ( !$this->usesMainDB() ) {
|
|
// Custom DB server list; probably doesn't use replication
|
|
return true;
|
|
}
|
|
|
|
$lb = $this->getSeparateMainLB()
|
|
?: MediaWikiServices::getInstance()->getDBLoadBalancer();
|
|
|
|
if ( $lb->getServerCount() <= 1 ) {
|
|
return true; // no replica DBs
|
|
}
|
|
|
|
// Main LB is used; wait for any replica DBs to catch up
|
|
$masterPos = $lb->getMasterPos();
|
|
|
|
$loop = new WaitConditionLoop(
|
|
function () use ( $lb, $masterPos ) {
|
|
return $lb->waitForAll( $masterPos, 1 );
|
|
},
|
|
$this->syncTimeout,
|
|
$this->busyCallbacks
|
|
);
|
|
|
|
return ( $loop->invoke() === $loop::CONDITION_REACHED );
|
|
}
|
|
}
|