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MySQLPrimaryPos.php
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MySQLPrimaryPos.php
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<?php
namespace Wikimedia\Rdbms;
use InvalidArgumentException;
use Stringable;
/**
* DBPrimaryPos implementation for MySQL and MariaDB.
*
* Note that primary positions and sync logic here make some assumptions:
*
* - Binlog-based usage assumes single-source replication and non-hierarchical replication.
* - GTID-based usage allows getting/syncing with multi-source replication. It is assumed
* that GTID sets are complete (e.g. include all domains on the server).
*
* @see https://mariadb.com/kb/en/library/gtid/
* @see https://dev.mysql.com/doc/refman/5.6/en/replication-gtids-concepts.html
* @internal
*/
class MySQLPrimaryPos implements Stringable, DBPrimaryPos {
/** @var string One of (BINARY_LOG, GTID_MYSQL, GTID_MARIA) */
private $style;
/** @var string|null Base name of all Binary Log files */
private $binLog;
/** @var array<int,int|string>|null Binary Log position tuple (index number, event number) */
private $logPos;
/** @var string[] Map of (server_uuid/gtid_domain_id => GTID) */
private $gtids = [];
/** @var string|null Active GTID domain ID */
private $activeDomain;
/** @var string|null ID of the server were DB writes originate */
private $activeServerId;
/** @var string|null UUID of the server were DB writes originate */
private $activeServerUUID;
/** @var float UNIX timestamp */
private $asOfTime = 0.0;
private const BINARY_LOG = 'binary-log';
private const GTID_MARIA = 'gtid-maria';
private const GTID_MYSQL = 'gtid-mysql';
/** Key name of the 6 digit binary log index number of a position tuple */
public const CORD_INDEX = 0;
/** Key name of the 64 bit binary log event number of a position tuple */
public const CORD_EVENT = 1;
/**
* @param string $position One of (comma separated GTID list, <binlog file>/<64 bit integer>)
* @param float $asOfTime UNIX timestamp
*/
public function __construct( $position, $asOfTime ) {
$this->init( $position, $asOfTime );
}
/**
* @param string $position
* @param float $asOfTime
*/
protected function init( $position, $asOfTime ) {
$m = [];
if ( preg_match( '!^(.+)\.(\d+)/(\d+)$!', $position, $m ) ) {
$this->binLog = $m[1]; // ideally something like host name
$this->logPos = [ self::CORD_INDEX => (int)$m[2], self::CORD_EVENT => $m[3] ];
$this->style = self::BINARY_LOG;
} else {
$gtids = array_filter( array_map( 'trim', explode( ',', $position ) ) );
foreach ( $gtids as $gtid ) {
$components = self::parseGTID( $gtid );
if ( !$components ) {
throw new InvalidArgumentException( "Invalid GTID '$gtid'." );
}
[ $domain, $eventNumber, , $this->style ] = $components;
if ( isset( $this->gtids[$domain] ) ) {
// For MySQL, handle the case where some past issue caused a gap in the
// executed GTID set, e.g. [last_purged+1,N-1] and [N+1,N+2+K]. Ignore the
// gap by using the GTID with the highest ending event number.
[ , $otherEventNumber ] = self::parseGTID( $this->gtids[$domain] );
if ( $eventNumber > $otherEventNumber ) {
$this->gtids[$domain] = $gtid;
}
} else {
$this->gtids[$domain] = $gtid;
}
}
if ( !$this->gtids ) {
throw new InvalidArgumentException( "GTID set cannot be empty." );
}
}
$this->asOfTime = $asOfTime;
}
public function asOfTime() {
return $this->asOfTime;
}
public function hasReached( DBPrimaryPos $pos ) {
if ( !( $pos instanceof self ) ) {
throw new InvalidArgumentException( "Position not an instance of " . __CLASS__ );
}
// Prefer GTID comparisons, which work with multi-tier replication
$thisPosByDomain = $this->getActiveGtidCoordinates();
$thatPosByDomain = $pos->getActiveGtidCoordinates();
if ( $thisPosByDomain && $thatPosByDomain ) {
$comparisons = [];
// Check that this has positions reaching those in $pos for all domains in common
foreach ( $thatPosByDomain as $domain => $thatPos ) {
if ( isset( $thisPosByDomain[$domain] ) ) {
$comparisons[] = ( $thatPos <= $thisPosByDomain[$domain] );
}
}
// Check that $this has a GTID for at least one domain also in $pos; due to MariaDB
// quirks, prior primary switch-overs may result in inactive garbage GTIDs that cannot
// be cleaned up. Assume that the domains in both this and $pos cover the relevant
// active channels.
return ( $comparisons && !in_array( false, $comparisons, true ) );
}
// Fallback to the binlog file comparisons
$thisBinPos = $this->getBinlogCoordinates();
$thatBinPos = $pos->getBinlogCoordinates();
if ( $thisBinPos && $thatBinPos && $thisBinPos['binlog'] === $thatBinPos['binlog'] ) {
return ( $thisBinPos['pos'] >= $thatBinPos['pos'] );
}
// Comparing totally different binlogs does not make sense
return false;
}
/**
* @return array<int,int|string>|null Tuple of (binary log file number, 64 bit event number)
* @since 1.31
*/
public function getLogPosition() {
return $this->gtids ? null : $this->logPos;
}
/**
* @return string|null Name of the binary log file for this position
* @since 1.31
*/
public function getLogFile() {
// @phan-suppress-next-line PhanTypeArraySuspiciousNullable
return $this->gtids ? null : "{$this->binLog}.{$this->logPos[self::CORD_INDEX]}";
}
/**
* @return array<string,string> Map of (server_uuid/gtid_domain_id => GTID)
* @since 1.31
*/
public function getGTIDs() {
return $this->gtids;
}
/**
* Set the GTID domain known to be used in new commits on a replication stream of interest
*
* This makes getRelevantActiveGTIDs() filter out GTIDs from other domains
*
* @see MySQLPrimaryPos::getRelevantActiveGTIDs()
* @see https://mariadb.com/kb/en/library/gtid/#gtid_domain_id
*
* @param string|int|null $id @@gtid_domain_id of the active replication stream
* @return MySQLPrimaryPos This instance (since 1.34)
* @since 1.31
*/
public function setActiveDomain( $id ) {
$this->activeDomain = (string)$id;
return $this;
}
/**
* Set the server ID known to be used in new commits on a replication stream of interest
*
* This makes getRelevantActiveGTIDs() filter out GTIDs from other origin servers
*
* @see MySQLPrimaryPos::getRelevantActiveGTIDs()
*
* @param string|int|null $id @@server_id of the server were writes originate
* @return MySQLPrimaryPos This instance (since 1.34)
* @since 1.31
*/
public function setActiveOriginServerId( $id ) {
$this->activeServerId = (string)$id;
return $this;
}
/**
* Set the server UUID known to be used in new commits on a replication stream of interest
*
* This makes getRelevantActiveGTIDs() filter out GTIDs from other origin servers
*
* @see MySQLPrimaryPos::getRelevantActiveGTIDs()
*
* @param string|null $id @@server_uuid of the server were writes originate
* @return MySQLPrimaryPos This instance (since 1.34)
* @since 1.31
*/
public function setActiveOriginServerUUID( $id ) {
$this->activeServerUUID = $id;
return $this;
}
/**
* @param MySQLPrimaryPos $pos
* @param MySQLPrimaryPos $refPos
* @return string[] List of active GTIDs from $pos that have domains in $refPos
* @since 1.34
*/
public static function getRelevantActiveGTIDs( MySQLPrimaryPos $pos, MySQLPrimaryPos $refPos ) {
return array_values( array_intersect_key(
$pos->gtids,
$pos->getActiveGtidCoordinates(),
$refPos->gtids
) );
}
/**
* @see https://mariadb.com/kb/en/mariadb/gtid
* @see https://dev.mysql.com/doc/refman/5.6/en/replication-gtids-concepts.html
* @return array<string,int> Map of (server_uuid/gtid_domain_id => integer position)
*/
protected function getActiveGtidCoordinates() {
$gtidInfos = [];
foreach ( $this->gtids as $gtid ) {
[ $domain, $pos, $server ] = self::parseGTID( $gtid );
$ignore = false;
// Filter out GTIDs from non-active replication domains
if ( $this->style === self::GTID_MARIA && $this->activeDomain !== null ) {
$ignore = $ignore || ( $domain !== $this->activeDomain );
}
// Likewise for GTIDs from non-active replication origin servers
if ( $this->style === self::GTID_MARIA && $this->activeServerId !== null ) {
$ignore = $ignore || ( $server !== $this->activeServerId );
} elseif ( $this->style === self::GTID_MYSQL && $this->activeServerUUID !== null ) {
$ignore = $ignore || ( $server !== $this->activeServerUUID );
}
if ( !$ignore ) {
$gtidInfos[$domain] = $pos;
}
}
return $gtidInfos;
}
/**
* @param string $id GTID
* @return string[]|null (domain ID, event number, source server ID, style) for MariaDB,
* (source server UUID, event number, source server UUID, style) for MySQL, or null
*/
protected static function parseGTID( $id ) {
$m = [];
if ( preg_match( '!^(\d+)-(\d+)-(\d+)$!', $id, $m ) ) {
// MariaDB style: "<32 bit domain ID>-<32 bit server id>-<64 bit event number>"
$channelId = $m[1];
$originServerId = $m[2];
$eventNumber = $m[3];
$style = self::GTID_MARIA;
} elseif ( preg_match( '!^(\w{8}-\w{4}-\w{4}-\w{4}-\w{12}):(?:\d+-|)(\d+)$!', $id, $m ) ) {
// MySQL style: "<server UUID>:<64 bit event number>[-<64 bit event number>]".
// Normally, the first number should reflect the point (gtid_purged) where older
// binary logs where purged to save space. When doing comparisons, it may as well
// be 1 in that case. Assume that this is generally the situation.
$channelId = $m[1];
$originServerId = $m[1];
$eventNumber = $m[2];
$style = self::GTID_MYSQL;
} else {
return null;
}
return [ $channelId, $eventNumber, $originServerId, $style ];
}
/**
* @see https://dev.mysql.com/doc/refman/5.7/en/show-master-status.html
* @see https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html
* @return array|false Map of (binlog:<string>, pos:(<integer>, <integer>)) or false
*/
protected function getBinlogCoordinates() {
return ( $this->binLog !== null && $this->logPos !== null )
? [ 'binlog' => $this->binLog, 'pos' => $this->logPos ]
: false;
}
public static function newFromArray( array $data ) {
$pos = new self( $data['position'], $data['asOfTime'] );
if ( isset( $data['activeDomain'] ) ) {
$pos->setActiveDomain( $data['activeDomain'] );
}
if ( isset( $data['activeServerId'] ) ) {
$pos->setActiveOriginServerId( $data['activeServerId'] );
}
if ( isset( $data['activeServerUUID'] ) ) {
$pos->setActiveOriginServerUUID( $data['activeServerUUID'] );
}
return $pos;
}
public function toArray(): array {
return [
'_type_' => get_class( $this ),
'position' => $this->__toString(),
'activeDomain' => $this->activeDomain,
'activeServerId' => $this->activeServerId,
'activeServerUUID' => $this->activeServerUUID,
'asOfTime' => $this->asOfTime
];
}
/**
* @return string GTID set or <binary log file>/<position> (e.g db1034-bin.000976/843431247)
*/
public function __toString() {
return $this->gtids
? implode( ',', $this->gtids )
// @phan-suppress-next-line PhanTypeArraySuspiciousNullable
: $this->getLogFile() . "/{$this->logPos[self::CORD_EVENT]}";
}
}

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MySQLPrimaryPos.php (10 KB)

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