code: def get_cid():
      
      cid = getattr(_thread_locals, 'CID', None)
      if cid is None and getattr(settings, 'CID_GENERATE', False):
          cid = str(uuid.uuid4())
          set_cid(cid)
      return cid
docs: Return the currently set correlation id (if any).
  
      If no correlation id has been set and ``CID_GENERATE`` is enabled
      in the settings, a new correlation id is set and returned.
  
      FIXME (dbaty): in version 2, just `return getattr(_thread_locals, 'CID', None)`
      We want the simplest thing here and let `generate_new_cid` do the job.