Clear FileSystemCache in Symfony 3.4 - symfony

Question

I use Symfony\Component\Cache\Simple\FilesystemCache;
It works when I $cache->set $cache->get $cache->clear() etc
I don't want to use a custom ttl. I want to clear the cache setted only with console.
But when I do php bin/console cache:clear, it doesn't clear cache I have set before with FilesystemCache.
I have tried to clear every pools with console but it doesn't clear $cache either.

Answer 1

1. Why it happens
Symfony's bin/console cache:clear command clears the cache only from kernel cache dir, which is var/cache/{env} by default.
When you create instance of FilesystemCache, you can provide a path where you want to store your cache as a 3rd parameter. Here's a signature of FilesystemCache constructor
public function __construct(string $namespace = '', int $defaultLifetime = 0, string $directory = null)
If you don't provide 3rd parameter it will end up as sys_get_temp_dir().'/symfony-cache', which is /tmp/symfony-cache on Linux.
As you can see it's a different directory and it won't be cleared by cache:clear command.
2. How to fix it
The proper way
You need to create your own data-cache:clear command. It's very simple https://symfony.com/doc/current/console.html
In execute() method of your command you should instantiate your FilesystemCache and call clear() on it. Example:
protected function execute(InputInterface $input, OutputInterface $output)
{
$cache = new FilesystemCache();
$cache->clear();
}
Then you can call php bin/console data-cache:clear from console.
If you decide to switch to some other caching engine in future (Redis, Memcached etc.) you can simply adjust that command to clear that cache.
The wrong way
It will only work if you keep using FilesystemCache and does not
provide fine-grained control of which cache you actually clear.
You can store your cache in kernel.cache_dir by passing a 3rd parameter to FilesystemCache when you instantiate it.
Example:
$cache = new FilesystemCache('', 0, $container->getParameter('kernel.cache_dir').'/data-cache');
or when configured as a service
Symfony\Component\Cache\Simple\FilesystemCache:
arguments:
- ''
- 0
- '%kernel.cache_dir%/data-cache'
This way Symfony's cache:clear command will work for you, but it's not a good idea to store these 2 types of cache in the same place.
If you change some of your project files, you may want to clear only
kernel cache in /var/cache while keeping your data cache intact and
vice versa. That's why I recommend not to use this solution!

Answer 2

It finally works, using AdapterInterface
<?php
namespace Gh\GhBundle\Manager;
use Symfony\Component\Cache\Adapter\AdapterInterface;
class AppManager
{
protected $_rootDir;
protected $_cache;
public function __construct($rootDir, AdapterInterface $cache)
{
$this->_rootDir = $rootDir;
$this->_cache = $cache;
}
/**
*
* Get version of this app
* #return string
*/
public function getVersion()
{
$cache = $this->_cache;
$numVersion = $cache->getItem('stats.num_version');
if (!$numVersion->isHit()) {
$version = !file_exists($this->_rootDir . '/RELEASE.TXT') ? 'dev' : file_get_contents($this->_rootDir . '/RELEASE.TXT');
$numVersion->set($version);
$cache->save($numVersion);
}
return $numVersion->get();
}
/**
*
* Get name of this app
* #return string
*/
public function getName()
{
return 'GH';
}
}