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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Maintenance\Validators; |
| 4 | |
| 5 | use CirrusSearch\Maintenance\Printer; |
| 6 | use CirrusSearch\Maintenance\Reindexer; |
| 7 | use Elastica\Client; |
| 8 | use MediaWiki\Language\RawMessage; |
| 9 | use Status; |
| 10 | |
| 11 | class SpecificAliasValidator extends IndexAliasValidator { |
| 12 | /** |
| 13 | * @var Reindexer |
| 14 | */ |
| 15 | private $reindexer; |
| 16 | |
| 17 | /** |
| 18 | * @var array |
| 19 | */ |
| 20 | private $reindexParams; |
| 21 | |
| 22 | /** |
| 23 | * @var Validator[] |
| 24 | */ |
| 25 | private $reindexValidators; |
| 26 | |
| 27 | /** |
| 28 | * @var bool |
| 29 | */ |
| 30 | private $reindexAndRemoveOk; |
| 31 | |
| 32 | /** |
| 33 | * @param Client $client |
| 34 | * @param string $aliasName |
| 35 | * @param string $specificIndexName |
| 36 | * @param bool $startOver |
| 37 | * @param Reindexer $reindexer |
| 38 | * @param array $reindexParams |
| 39 | * @param Validator[] $reindexValidators |
| 40 | * @param bool $reindexAndRemoveOk |
| 41 | * @param Printer|null $out |
| 42 | */ |
| 43 | public function __construct( |
| 44 | Client $client, |
| 45 | $aliasName, |
| 46 | $specificIndexName, |
| 47 | $startOver, |
| 48 | Reindexer $reindexer, |
| 49 | array $reindexParams, |
| 50 | array $reindexValidators, |
| 51 | $reindexAndRemoveOk, |
| 52 | Printer $out = null |
| 53 | ) { |
| 54 | // @todo: this constructor takes too many arguments - refactor! |
| 55 | |
| 56 | parent::__construct( $client, $aliasName, $specificIndexName, $startOver, $out ); |
| 57 | |
| 58 | $this->reindexer = $reindexer; |
| 59 | $this->reindexParams = $reindexParams; |
| 60 | $this->reindexValidators = $reindexValidators; |
| 61 | $this->reindexAndRemoveOk = $reindexAndRemoveOk; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * @param string[] $add |
| 66 | * @param string[] $remove |
| 67 | * @return Status |
| 68 | */ |
| 69 | protected function updateIndices( array $add, array $remove ) { |
| 70 | if ( !$remove ) { |
| 71 | return $this->updateFreeIndices( $add ); |
| 72 | } |
| 73 | |
| 74 | if ( !$this->reindexAndRemoveOk ) { |
| 75 | $this->output( "cannot correct!\n" ); |
| 76 | return Status::newFatal( new RawMessage( |
| 77 | "The alias is held by another index which means it might be actively serving\n" . |
| 78 | "queries. You can solve this problem by running this program again with\n" . |
| 79 | "--reindexAndRemoveOk. Make sure you understand the consequences of either\n" . |
| 80 | "choice." ) ); |
| 81 | } |
| 82 | |
| 83 | try { |
| 84 | $this->output( "is taken...\n" ); |
| 85 | $this->outputIndented( "\tReindexing...\n" ); |
| 86 | $this->reindexer->reindex( ...$this->reindexParams ); |
| 87 | # Expecting this to usually be a noop, index should have been created with |
| 88 | # appropriate settings and reindexer should restore all the settings it |
| 89 | # changed, but it couldn't hurt to check again. |
| 90 | foreach ( $this->reindexValidators as $validator ) { |
| 91 | $status = $validator->validate(); |
| 92 | if ( !$status->isOK() ) { |
| 93 | return $status; |
| 94 | } |
| 95 | } |
| 96 | // Validators might have changed replica counts, wait for everything to |
| 97 | // get to green. |
| 98 | $this->reindexer->waitForGreen(); |
| 99 | } catch ( \Exception $e ) { |
| 100 | return Status::newFatal( new RawMessage( $e->getMessage() ) ); |
| 101 | } |
| 102 | |
| 103 | // now add alias & remove indices for real |
| 104 | $status = Status::newGood(); |
| 105 | $status->merge( $this->swapAliases( $add ) ); |
| 106 | $toRemove = []; |
| 107 | foreach ( $remove as $indexToRemove ) { |
| 108 | $resp = $this->client->request( $indexToRemove . '/_alias', 'GET' ); |
| 109 | if ( !$resp->isOk() ) { |
| 110 | return Status::newFatal( "Cannot fetch aliases of the old index $indexToRemove" ); |
| 111 | } |
| 112 | if ( count( $resp->getData()[$indexToRemove]['aliases'] ?? [] ) > 0 ) { |
| 113 | $this->outputIndented( "\t$indexToRemove still have active aliases, cannot remove.\n" ); |
| 114 | } else { |
| 115 | $toRemove[] = $indexToRemove; |
| 116 | } |
| 117 | } |
| 118 | $status->merge( parent::updateIndices( [], $toRemove ) ); |
| 119 | return $status; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * @param string[] $add |
| 124 | * @return Status |
| 125 | */ |
| 126 | public function updateFreeIndices( array $add ) { |
| 127 | $this->output( "alias is free..." ); |
| 128 | |
| 129 | foreach ( $add as $indexName ) { |
| 130 | $index = $this->client->getIndex( $indexName ); |
| 131 | $index->addAlias( $this->aliasName, false ); |
| 132 | } |
| 133 | |
| 134 | $this->output( "corrected\n" ); |
| 135 | |
| 136 | return Status::newGood(); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * @param array $add |
| 141 | * @return Status |
| 142 | */ |
| 143 | public function swapAliases( array $add ) { |
| 144 | $this->outputIndented( "\tSwapping alias..." ); |
| 145 | |
| 146 | foreach ( $add as $indexName ) { |
| 147 | $index = $this->client->getIndex( $indexName ); |
| 148 | $index->addAlias( $this->aliasName, true ); |
| 149 | } |
| 150 | |
| 151 | $this->output( "done\n" ); |
| 152 | |
| 153 | return Status::newGood(); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * @param string $name |
| 158 | * @return bool |
| 159 | */ |
| 160 | protected function shouldRemoveFromAlias( $name ) { |
| 161 | return true; |
| 162 | } |
| 163 | } |