code: def _find_global(self, module, func):
          
          if module == __name__:
              if func == '_unpickle_call_error' or func == 'CallError':
                  return _unpickle_call_error
              elif func == '_unpickle_sender':
                  return self._unpickle_sender
              elif func == '_unpickle_context':
                  return self._unpickle_context
              elif func == 'Blob':
                  return Blob
              elif func == 'Secret':
                  return Secret
              elif func == 'Kwargs':
                  return Kwargs
          elif module == '_codecs' and func == 'encode':
              return self._unpickle_bytes
          elif module == '__builtin__' and func == 'bytes':
              return BytesType
          raise StreamError('cannot unpickle %r/%r', module, func)
docs: Return the class implementing `module_name.class_name` or raise
          `StreamError` if the module is not whitelisted.