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<?php
namespace SMW\Elastic\Indexer;
use SMW\Elastic\Connection\Client as ElasticClient;
use SMW\Elastic\Exception\NoConnectionException;
/**
* The index uses V1/V2 to switch between versions during a rebuild allowing the
* index to be available while a reindex is on going and after the process has
* been indices will be switched (aka rollover) without down time. The index uses
* aliases to hide the "real" identity of the current active index.
*
* @see https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-rollover-index.html
*
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class Rollover {
/**
* @var ElasticClient
*/
private $connection;
/**
* @since 3.0
*
* @param ElasticClient $connection
*/
public function __construct( ElasticClient $connection ) {
$this->connection = $connection;
}
/**
* @since 3.0
*
* @param string $type
* @param string $version
*
* @return string
*/
public function rollover( $type, $version ) {
$index = $this->connection->getIndexNameByType( $type );
$indices = $this->connection->indices();
$params = [];
$actions = [];
$old = $version === 'v2' ? 'v1' : 'v2';
$check = false;
if ( $indices->exists( [ 'index' => "$index-$old" ] ) ) {
$actions = [
[ 'remove' => [ 'index' => "$index-$old", 'alias' => $index ] ],
[ 'add' => [ 'index' => "$index-$version", 'alias' => $index ] ]
];
$check = true;
} else {
// No old index
$old = $version;
$actions = [
[ 'add' => [ 'index' => "$index-$version", 'alias' => $index ] ]
];
}
$params['body'] = [ 'actions' => $actions ];
$indices->updateAliases( $params );
if ( $check && $indices->exists( [ 'index' => "$index-$old" ] ) ) {
$indices->delete( [ "index" => "$index-$old" ] );
}
$this->connection->releaseLock( $type );
return $old;
}
/**
* @since 3.0
*
* @param string $type
*
* @throws NoConnectionException
*/
public function update( $type ) {
// Fail hard since we expect to create an index but are unable to do so!
if ( !$this->connection->ping() ) {
throw new NoConnectionException();
}
$indices = $this->connection->indices();
$index = $this->connection->getIndexName(
$type
);
// Shouldn't happen but just in case where the root index is
// used as index but not an alias
if ( $indices->exists( [ 'index' => "$index" ] ) && !$indices->existsAlias( [ 'name' => "$index" ] ) ) {
$indices->delete( [ 'index' => "$index" ] );
}
// Check v1/v2 and if both exists (which shouldn't happen but most likely
// caused by an unfinshed rebuilder run) then use v1 as master
if ( $indices->exists( [ 'index' => "$index-v1" ] ) ) {
// Just in case
if ( $indices->exists( [ 'index' => "$index-v2" ] ) ) {
$indices->delete( [ 'index' => "$index-v2" ] );
}
$actions[] = [ 'add' => [ 'index' => "$index-v1", 'alias' => $index ] ];
} elseif ( $indices->exists( [ 'index' => "$index-v2" ] ) ) {
$actions[] = [ 'add' => [ 'index' => "$index-v2", 'alias' => $index ] ];
} else {
$version = $this->connection->createIndex( $type );
$actions = [
[ 'add' => [ 'index' => "$index-$version", 'alias' => $index ] ]
];
}
$params['body'] = [ 'actions' => $actions ];
$indices->updateAliases( $params );
}
/**
* @since 3.0
*
* @param string $type
*
* @throws NoConnectionException
*/
public function delete( $type ) {
// Fail hard since we expect to delete an index but are unable to do so!
if ( !$this->connection->ping() ) {
throw new NoConnectionException();
}
$indices = $this->connection->indices();
$index = $this->connection->getIndexName(
$type
);
if ( $indices->exists( [ 'index' => "$index-v1" ] ) ) {
$indices->delete( [ 'index' => "$index-v1" ] );
}
if ( $indices->exists( [ 'index' => "$index-v2" ] ) ) {
$indices->delete( [ 'index' => "$index-v2" ] );
}
if ( $indices->exists( [ 'index' => "$index" ] ) && !$indices->existsAlias( [ 'name' => "$index" ] ) ) {
$indices->delete( [ 'index' => "$index" ] );
}
$this->connection->releaseLock( $type );
}
}
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