README

Yii Caching Library - Redis Handler

This package provides the Redis handler and implements PSR-16 cache.

Requirements

• PHP 8.0 or higher.

Installation

The package could be installed with Composer:

composer require yiisoft/cache-redis

General usage

For more information about the client instance and connection configuration, see the documentation of the predis/predis package.

/**
 * @var \Predis\ClientInterface $client Predis client instance to use.
 */
$cache = new \Yiisoft\Cache\Redis\RedisCache($client);

The package does not contain any additional functionality for interacting with the cache, except those defined in the PSR-16 interface.

$parameters = ['user_id' => 42];
$key = 'demo';

// try retrieving $data from cache
$data = $cache->get($key);

if ($data === null) {
    // $data is not found in cache, calculate it from scratch
    $data = calculateData($parameters);
    
    // store $data in cache for an hour so that it can be retrieved next time
    $cache->set($key, $data, 3600);
}

// $data is available here

In order to delete value you can use:

$cache->delete($key);
// Or all cache
$cache->clear();

To work with values in a more efficient manner, batch operations should be used:

• getMultiple()
• setMultiple()
• deleteMultiple()

This package can be used as a cache handler for the Yii Caching Library.

Redis cluster supported

The package implements Redis cluster support via Predis package.

For example, if your cluster configuration has three master nodes and three slave nodes, your client configuration might look like this:

$client = new \Predis\Client([
        ['host' => 'redis-node-1', 'port' => 'redis-node-port-1',],
        ['host' => 'redis-node-2', 'port' => 'redis-node-port-2',],
        ['host' => 'redis-node-3', 'port' => 'redis-node-port-3',],
        ['host' => 'redis-node-4', 'port' => 'redis-node-port-4',],
        ['host' => 'redis-node-5', 'port' => 'redis-node-port-5',],
        ['host' => 'redis-node-6', 'port' => 'redis-node-port-6',],
    ],
    [
        'cluster' => 'redis',
        'parameters' => [
            'password' => 'Password',
        ],
    ]
);
$cache = new \Yiisoft\Cache\Redis\RedisCache($client);

Predis will route commands on its own when specifying Redis nodes in the cluster to the appropriate nodes depending on the keys that are specified in the commands.

You can implement \Predis\Distribution\DistributorInterface to create their own distributors used by the client to distribute keys among a cluster of servers.

Then your config might look like this:

$client = new \Predis\Client([
        ['host' => 'redis-node-1', 'port' => 'redis-node-port-1',],
        ['host' => 'redis-node-2', 'port' => 'redis-node-port-2',],
        ['host' => 'redis-node-3', 'port' => 'redis-node-port-3',],
        ['host' => 'redis-node-4', 'port' => 'redis-node-port-4',],
        ['host' => 'redis-node-5', 'port' => 'redis-node-port-5',],
        ['host' => 'redis-node-6', 'port' => 'redis-node-port-6',],
    ],
    [
        'cluster' => static function () {
            $distributor = new \CustomDistributor(); // Your custom distributor
            $strategy = new \Predis\Cluster\PredisStrategy($distributor);

            return new \Predis\Connection\Cluster\PredisCluster($strategy);
        },
        'parameters' => [
            'password' => 'Password',
        ],
    ]
);

Documentation

• Internals

If you need help or have a question, the Yii Forum is a good place for that. You may also check out other Yii Community Resources.

License

The Yii Caching Library - Redis Handler is free software. It is released under the terms of the BSD License. Please see LICENSE for more information.

Maintained by Yii Software.

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