public function findSlaves($master_name = null)
{
$slaves = [];
if (null !== $master_name) {
$slaves = $this->client->sentinel('slaves', $master_name);
} else {
// Find out slaves attached to each master instance
foreach ($this->findMasters() as $master) {
$name = $master['name'];
$slaves = array_merge($slaves, $this->client->sentinel('slaves', $name));
}
}
return $this->getConnectionParams($slaves, 'slave');
}