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Till Krüss
84 lines
2.5 KiB
PHP
84 lines
2.5 KiB
PHP
<?php
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/*
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* This file is part of the Predis package.
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*
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* (c) 2009-2020 Daniele Alessandri
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* (c) 2021-2026 Till Krüss
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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require __DIR__ . '/shared.php';
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// Predis allows to set Lua scripts as read-only operations for replication.
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// This works for both EVAL and EVALSHA and also for the client-side abstraction
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// built upon them (Predis\Command\ScriptCommand). This example shows a slightly
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// more complex configuration that injects a new script command in the command
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// factory used by the client and marks it as a read-only operation so that it
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// will be executed on slaves.
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use Predis\Command\ScriptCommand;
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use Predis\Connection\Replication\MasterSlaveReplication;
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use Predis\Replication\ReplicationStrategy;
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// ------------------------------------------------------------------------- //
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// Define a new script command that returns all the fields of a variable number
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// of hashes with a single roundtrip.
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class HashMultipleGetAll extends ScriptCommand
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{
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public const BODY = <<<LUA
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local hashes = {}
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for _, key in pairs(KEYS) do
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table.insert(hashes, key)
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table.insert(hashes, redis.call('hgetall', key))
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end
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return hashes
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LUA;
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public function getScript()
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{
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return self::BODY;
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}
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}
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// ------------------------------------------------------------------------- //
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$parameters = [
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'tcp://127.0.0.1:6381?role=master&database=15',
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'tcp://127.0.0.1:6382?role=slave&alias=slave-01&database=15',
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];
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$options = [
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'commands' => [
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'hmgetall' => 'HashMultipleGetAll',
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],
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'replication' => static function () {
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$strategy = new ReplicationStrategy();
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$strategy->setScriptReadOnly(HashMultipleGetAll::BODY);
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$replication = new MasterSlaveReplication($strategy);
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return $replication;
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},
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];
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// ------------------------------------------------------------------------- //
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$client = new Predis\Client($parameters, $options);
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// Execute the following commands on the master server using redis-cli:
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// $ ./redis-cli HMSET metavars foo bar hoge piyo
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// $ ./redis-cli HMSET servers master host1 slave host2
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$hashes = $client->hmgetall('metavars', 'servers');
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$replication = $client->getConnection();
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$stillOnSlave = $replication->getCurrent() === $replication->getConnectionByAlias('slave-01');
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echo 'Is still on slave? ', $stillOnSlave ? 'YES!' : 'NO!', PHP_EOL;
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var_export($hashes);
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