code: def get_current_span():
      
      # Check against the old, ScopeManager-less implementation,
      # for backwards compatibility.
      context = RequestContextManager.current_context()
      if context is not None:
          return context.span
  
      active = opentracing.tracer.scope_manager.active
      return active.span if active else None
docs: Access current request context and extract current Span from it.
      :return:
          Return current span associated with the current request context.
          If no request context is present in thread local, or the context
          has no span, return None.