Extended Session in L5 does not persist between requests - php

Question

I am extending the session provider in order to persist some required data. I started editing AppServiceProvider's boot method:
\Session::extend('desk', function($app)
{
return new Desk();
});
Desk class looks like:
namespace App\Services;
use Illuminate\Session\ExistenceAwareInterface;
class Desk implements \SessionHandlerInterface, ExistenceAwareInterface{
/**
* The existence state of the session.
* #var bool
*/
protected $exists;
public function close()
{
return true;
}
public function destroy($session_id)
{
$session = $em->find('Session', $session_id);
$em->remove($session);
$em->flush();
return true;
}
public function gc($maxlifetime)
{
// TODO: Implement gc() method.
}
public function open($save_path, $session_id)
{
return true;
}
public function read($session_id)
{
$session = $em->find('Session', $session_id);
if ($sesion !== null){
$this->exists = true;
return $session->getPayload();
}
}
public function write($session_id, $session_data)
{
$session = $em->find('Session', $session_id);
if ($session === null){
$session = new Session($session_id, $session_data);
$em->persist($session);
}
else{
$session->setPayload($session_data);
}
$em->flush();
$this->exists = true;
}
public function setExists($value)
{
$this->exists = $value;
return $this;
}
}
After finish the implementation, I changed the session config to this:
return [
'driver' => 'desk',
'lifetime' => 120,
'expire_on_close' => false,
'encrypt' => false,
'files' => storage_path().'/framework/sessions',
'connection' => null,
'table' => 'sessions',
'lottery' => [2, 100],
'cookie' => 'lote_session',
'path' => '/',
'domain' => null,
'secure' => false,
];
When I load the page there is not problem, but after do a success login request and then, refresh the page, the session expires and the user is a guest again. Do I miss something?
Additional information: if I revert the session driver to "file", everything goes fine.

Answer 1

Well, for others that need/want to extends the session provider like me, pay attention to session's table structure. My mistake was that the payload column was set as:
payload varchar(255) not null
Because of laravel serialization data, the payload value could be has more than 255 characters length, in consequence, it will break the data and make it inconsistent. You can consider:
payload text not null