%%%---------------------------------------------------------------------- %%% File : nodetree_virtual.erl %%% Author : Christophe Romain %%% Purpose : Standard node tree plugin using no storage backend %%% Created : 1 Dec 2007 by Christophe Romain %%% %%% %%% ejabberd, Copyright (C) 2002-2022 ProcessOne %%% %%% This program is free software; you can redistribute it and/or %%% modify it under the terms of the GNU General Public License as %%% published by the Free Software Foundation; either version 2 of the %%% License, or (at your option) any later version. %%% %%% This program is distributed in the hope that it will be useful, %%% but WITHOUT ANY WARRANTY; without even the implied warranty of %%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU %%% General Public License for more details. %%% %%% You should have received a copy of the GNU General Public License along %%% with this program; if not, write to the Free Software Foundation, Inc., %%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. %%% %%%---------------------------------------------------------------------- %%% @doc The module {@module} is the PubSub node tree plugin that %%% allow virtual nodes handling. This prevent storage of nodes. %%%

PubSub node tree plugins are using the {@link gen_nodetree} behaviour.

%%%

This plugin development is still a work in progress. Due to optimizations in %%% mod_pubsub, this plugin can not work anymore without altering functioning. %%% Please, send us comments, feedback and improvements.

-module(nodetree_virtual). -behaviour(gen_pubsub_nodetree). -author('christophe.romain@process-one.net'). -include("pubsub.hrl"). -export([init/3, terminate/2, options/0, set_node/1, get_node/3, get_node/2, get_node/1, get_nodes/2, get_nodes/1, get_all_nodes/1, get_parentnodes/3, get_parentnodes_tree/3, get_subnodes/3, get_subnodes_tree/3, create_node/6, delete_node/2]). init(_Host, _ServerHost, _Opts) -> ok. terminate(_Host, _ServerHost) -> ok. options() -> [{virtual_tree, true}]. set_node(_Node) -> ok. get_node(Host, Node, _From) -> get_node(Host, Node). get_node(Host, Node) -> Nidx = nodeidx(Host, Node), node_record(Host, Node, Nidx). get_node(Nidx) -> {Host, Node} = nodeid(Nidx), node_record(Host, Node, Nidx). get_nodes(Host) -> get_nodes(Host, infinity). get_nodes(_Host, _Limit) -> []. get_all_nodes(_Host) -> []. get_parentnodes(_Host, _Node, _From) -> []. get_parentnodes_tree(Host, Node, From) -> [{0, [get_node(Host, Node, From)]}]. get_subnodes(_Host, _Node, _From) -> []. get_subnodes_tree(Host, Node, _From) -> get_subnodes_tree(Host, Node). get_subnodes_tree(_Host, _Node) -> []. create_node(Host, Node, _Type, _Owner, _Options, _Parents) -> {error, {virtual, nodeidx(Host, Node)}}. delete_node(Host, Node) -> [get_node(Host, Node)]. %% internal helper node_record({U,S,R}, Node, Nidx) -> Host = mod_pubsub:host(S), Type = <<"pep">>, Module = mod_pubsub:plugin(Host, Type), #pubsub_node{nodeid = {{U,S,R},Node}, id = Nidx, type = Type, owners = [{U,S,R}], options = Module:options()}; node_record(Host, Node, Nidx) -> [Type|_] = mod_pubsub:plugins(Host), Module = mod_pubsub:plugin(Host, Type), #pubsub_node{nodeid = {Host, Node}, id = Nidx, type = Type, owners = [{<<"">>, Host, <<"">>}], options = Module:options()}. nodeidx({U,S,R}, Node) -> JID = jid:encode(jid:make(U,S,R)), <>; nodeidx(Host, Node) -> <>. nodeid(Nidx) -> [Head, Node] = binary:split(Nidx, <<":">>), case jid:decode(Head) of {jid,<<>>,Host,<<>>,_,_,_} -> {Host, Node}; {jid,U,S,R,_,_,_} -> {{U,S,R}, Node} end.