code: def rpc_get_all_namespaces( self, **con_info ):
          
          db = get_db_state(self.working_dir)
          all_namespaces = db.get_all_namespace_ids()
          db.close()
  
          return self.success_response( {'namespaces': all_namespaces} )
docs: Get all namespace names
          Return {'status': true, 'namespaces': [...]} on success
          Return {'error': ...} on error