def caller_name(self, skip=2):
        """
        Get a name of a caller in the format module.class.method

       `skip` specifies how many levels of stack to skip while getting caller
       name. skip=1 means "who calls me", skip=2 "who calls my caller" etc.

       An empty string is returned if skipped levels exceed stack height
       """
        stack = inspect.stack()
        start = 0 + skip
        if len(stack) < start + 1:
            return ''
        parentframe = stack[start][0]

        name = []
        module = inspect.getmodule(parentframe)
        # `modname` can be None when frame is executed directly in console
        # TODO(asr1kteam): consider using __main__
        if module:
            name.append(module.__name__)
        # detect classname
        if 'self' in parentframe.f_locals:
            # I don't know any way to detect call from the object method
            # XXX: there seems to be no way to detect static method call,
            # it will be just a function call
            name.append(parentframe.f_locals['self'].__class__.__name__)
        codename = parentframe.f_code.co_name
        if codename != '<module>':  # top level usually
            name.append(codename)  # function or a method
        del parentframe
        return ".".join(name)