code: def get_db_state(working_dir):
      
      impl = sys.modules[__name__]
      db_inst = BlockstackDB.get_readonly_instance(working_dir)
      assert db_inst, 'Failed to instantiate database handle'
      return db_inst
docs: Callback to the virtual chain state engine.
      Get a *read-only* handle to our state engine implementation
      (i.e. our name database).
  
      Note that in this implementation, the database
      handle returned will only support read-only operations by default.
      Attempts to save state with the handle will lead to program abort.
  
      Returns the handle on success
      Raises on error