2.13.4.19. Configuring Redis in OpenCart

Setting process Redis differs in different versions of OpenCart.

OpenCart 3.0
OpenCart 2.2-2.3
OpenCart 2.0-2.1
OpenCart 1.5

At the end of each of the two configuration files — config.php and admin/config.php — add the following code (in the line with the parameter CACHE_HOSTNAME insteadof example substitute hosting account namewhere the site is hosted):
```
// CACHE
define('CACHE_HOSTNAME', '/home/example/.system/redis.sock');
define('CACHE_PORT', 0);
define('CACHE_PREFIX', 'oc_');
```

In file system/library/cache/redis.php:

Find a line like this:

$this->cache->setTimeout(CACHE_PREFIX . $key, $this->expire);

And replace in it setTimeout on expireso that it looks like this:

$this->cache->expire(CACHE_PREFIX . $key, $this->expire);

Find a line like this:

$this->cache->delete(CACHE_PREFIX . $key);

And replace in it delete on delso that it looks like this:

$this->cache->del(CACHE_PREFIX . $key);

In file system/config/default.php find a block of code like this:

// Cache
$_['cache_engine'] = 'file'; // apc, file, mem or memcached
$_['cache_expire'] = 3600;

And in the line with the parameter cache_engine replace file on redisto make this block look like this:

// Cache
$_['cache_engine'] = 'redis'; // apc, file, mem or memcached
$_['cache_expire'] = 3600;

Check the site is working.

At the end of each of the two configuration files — config.php and admin/config.php — add the following code (in the line with the parameter CACHE_HOSTNAME insteadof example substitute hosting account namewhere the site is hosted):
```
// CACHE
define('CACHE_HOSTNAME', '/home/example/.system/redis.sock');
define('CACHE_PORT', 0);
define('CACHE_PREFIX', 'oc_');
```

In the catalog system/library/cache create a file redis.php with content like this:

<?php
namespace Cache;
class Redis {
	private $expire;
	private $cache;
	public function __construct($expire) {
		$this->expire = $expire;
		$this->cache = new \Redis();
		$this->cache->pconnect(CACHE_HOSTNAME, CACHE_PORT);
	}
	public function get($key) {
		$data = $this->cache->get(CACHE_PREFIX . $key);
		return json_decode($data, true);
	}
	public function set($key, $value) {
		$status = $this->cache->set(CACHE_PREFIX . $key, json_encode($value));
		if ($status) {
			$this->cache->expire(CACHE_PREFIX . $key, $this->expire);
		}
		return $status;
	}
	public function delete($key) {
		$this->cache->delete(CACHE_PREFIX . $key);
	}
}

In file system/config/default.php find a block of code like this:

// Cache
$_['cache_type'] = 'file'; // apc, file, mem or memcached
$_['cache_expire'] = 3600;

And in the line with the parameter cache_engine replace file on redisto make this block look like this:

// Cache
$_['cache_type'] = 'redis'; // apc, file, mem or memcached
$_['cache_expire'] = 3600;

Check the site is working.

At the end of each of the two configuration files — config.php and admin/config.php — add the following code (in the line with the parameter CACHE_HOSTNAME insteadof example substitute hosting account namewhere the site is hosted):
```
// CACHE
define('CACHE_HOSTNAME', '/home/example/.system/redis.sock');
define('CACHE_PORT', 0);
define('CACHE_PREFIX', 'oc_');
```

In the catalog system/library/cache create a file redis.php with content like this:

<?php
namespace Cache;
class Redis {
	private $expire;
	private $cache;
	public function __construct($expire) {
		$this->expire = $expire;
		$this->cache = new \Redis();
		$this->cache->pconnect(CACHE_HOSTNAME, CACHE_PORT);
	}
	public function get($key) {
		$data = $this->cache->get(CACHE_PREFIX . $key);
		return json_decode($data, true);
	}
	public function set($key, $value) {
		$status = $this->cache->set(CACHE_PREFIX . $key, json_encode($value));
		if ($status) {
			$this->cache->expire(CACHE_PREFIX . $key, $this->expire);
		}
		return $status;
	}
	public function delete($key) {
		$this->cache->delete(CACHE_PREFIX . $key);
	}
}

In each of the two index files - index.php and admin/index.php — find a block of code like this:
```
// Cache
$cache = new Cache('file');
$registry->set('cache', $cache);
```
And in the line with the parameter $cache replace file on redisto make this block look like this:
```
// Cache
$cache = new Cache('redis');
$registry->set('cache', $cache);
```
Check the site is working.

At the end of each of the two configuration files — config.php and admin/config.php — add the following code (in the line with the parameter REDIS_HOSTNAME insteadof example substitute hosting account namewhere the site is hosted):
```
// CACHE
define('CACHE_DRIVER', 'redis');
define('REDIS_HOSTNAME', '/home/example/.system/redis.sock');
define('REDIS_PORT', '0');
```

Replace file content system/library/cache.php to this (the driver code is taken fromhere):

<?php
final class Cache
{
    private $expire = 3600;
    private $serialize_type = 'json';
    private $cache_mode = 'redis';
    public function __construct()
    {
        $this->site_key = substr(md5(HTTP_SERVER), 0, 5);
        $this->redis = new Redis();
        if (!$this->redis->connect(REDIS_HOSTNAME, REDIS_PORT)) {
            $this->cache_mode = 'file';
        }
    }
    public function getCacheMode()
    {
        return $this->cache_mode;
    }
    public function setCacheMode($cache_mode = 'redis')
    {
        $this->cache_mode = $cache_mode;
    }
    public function setSerializeType($serialize_type = 'serialize')
    {
        $this->serialize_type = $serialize_type;
    }
    public function getSerializeType()
    {
        return $this->serialize_type;
    }
    public function get($key)
    {
        if ($this->cache_mode == 'redis') {
            $cache = $this->redis->get($key . '.' . $this->site_key);
        } else {
            $files = glob(DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\._-]/i', '', $key) . '.*');
            if ($files) {
                $cache = file_get_contents($files[0]);
                foreach ($files as $file) {
                    $time = substr(strrchr($file, '.'), 1);
                    if ($time < time()) {
                        if (file_exists($file)) {
                            unlink($file);
                        }
                    }
                }
            }
        }
        if ($this->serialize_type == 'json') {
            $data = json_decode($cache, true);
        } else {
            $data = unserialize($cache);
        }
        return $data;
    }
    public function set($key, $value, $expire = 0)
    {
        if ($expire == 0) {
            $expire = rand($this->expire, $this->expire + 400);
        }
        if ($this->cache_mode == 'redis') {
            $res = $this->redis->set($key . '.' . $this->site_key, json_encode($value), $expire);
        } else {
            $this->remove($key);
            $file = DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\._-]/i', '', $key) . '.' . (time() + $expire);
            $handle = fopen($file, 'w');
            if ($this->serialize_type == 'json') {
                $data = json_encode($value);
            } else {
                $data = serialize($value);
            }
            fwrite($handle, $data);
            fclose($handle);
        }
    }
    public function delete($key)
    {
        if ($this->cache_mode == 'redis') {
            $this->redis->delete($key . '.' . $this->site_key);
        } else {
            $files = glob(DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\._-]/i', '', $key) . '.*');
            if ($files) {
                foreach ($files as $file) {
                    if (file_exists($file)) {
                        unlink($file);
                        clearstatcache();
                    }
                }
            }
        }
    }
}

Check the site is working.

2.13.4.19. Configuring Redis in OpenCart

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