ejabberd_local

ejabberd_local用于注册发到服务器本身的IQ以及路由到本地的ejabberd_sm（message）

对外主要提供route，register_iq_handler，unregister_iq_response_handler方法

route(From, To, Packet) ->
    case catch do_route(From, To, Packet) of
      {'EXIT', Reason} ->
      ?ERROR_MSG("~p~nwhen processing: ~p",
             [Reason, {From, To, Packet}]);
      _ -> ok
    end.

do_route(From, To, Packet) ->
    ?DEBUG("local route~n\tfrom ~p~n\tto ~p~n\tpacket "
       "~P~n",
       [From, To, Packet, 8]),
    if To#jid.luser /= <<"">> ->
       ejabberd_sm:route(From, To, Packet);
       To#jid.lresource == <<"">> ->
       #xmlel{name = Name} = Packet,
       case Name of
         <<"iq">> -> process_iq(From, To, Packet);
         <<"message">> -> ok;
         <<"presence">> -> ok;
         _ -> ok
       end;
       true ->
       #xmlel{attrs = Attrs} = Packet,
       case xml:get_attr_s(<<"type">>, Attrs) of
         <<"error">> -> ok;
         <<"result">> -> ok;
         _ ->
         ejabberd_hooks:run(local_send_to_resource_hook,
                    To#jid.lserver, [From, To, Packet])
       end
    end.

route当是完整的message的信息的时候，通过ejabberd_sm:route路由信息

当是IQ信息的时候route:process_iq(From, To, Packet)处理，根据register_iq_handler注册的信息