code: def rpc_get_names(self, filename, source, offset):
          
          source = get_source(source)
          if hasattr(self.backend, "rpc_get_names"):
              return self.backend.rpc_get_names(filename, source, offset)
          else:
              raise Fault("get_names not implemented by current backend",
                          code=400)
docs: Get all possible names