anchor.diff:  handle_call(_, _From, State) ->
       {reply, invalid, State}.
   
  -% -----------------------------------------------------------------------------
  +% -------------------------------------------------------------------------
   
   handle_cast(_, State) ->
       {noreply, State}.
   
  -% -----------------------------------------------------------------------------
  +% -------------------------------------------------------------------------
   
   handle_info(_, State) ->
       {noreply, State}.
   
  -% -----------------------------------------------------------------------------
  +% -------------------------------------------------------------------------
   
   terminate(Reason, _State) ->
   	?info("Terminating due to ~p.", [Reason]),
  
positive.code: 	gen_server:call(Pid, {user, Username}).
  
  
  %% ----------------------------------------------------------------------------
  %% gen_server
  %% ----------------------------------------------------------------------------
  
  init({gen_server, [Host] = _Args}) ->
  	State = #state{
  
negative.code: code_change(_OldVersion, State, _Extra) ->
  	{reply, State}.
  
  %% ------------------------------------------------------------------------
  %% Internal API
  %% ------------------------------------------------------------------------
  
  %% @doc Authenticate user against mongo
  handle_auth(Username, Password, State) ->
  