mirror of
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125 lines
3.9 KiB
Erlang
125 lines
3.9 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : nodetree_virtual.erl
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%%% Author : Christophe Romain <christophe.romain@process-one.net>
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%%% Purpose : Standard node tree plugin using no storage backend
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%%% Created : 1 Dec 2007 by Christophe Romain <christophe.romain@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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%%% @doc The module <strong>{@module}</strong> is the PubSub node tree plugin that
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%%% allow virtual nodes handling. This prevent storage of nodes.
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%%% <p>PubSub node tree plugins are using the {@link gen_nodetree} behaviour.</p>
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%%% <p>This plugin development is still a work in progress. Due to optimizations in
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%%% mod_pubsub, this plugin can not work anymore without altering functioning.
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%%% Please, send us comments, feedback and improvements.</p>
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-module(nodetree_virtual).
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-behaviour(gen_pubsub_nodetree).
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-author('christophe.romain@process-one.net').
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-include("pubsub.hrl").
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-export([init/3, terminate/2, options/0, set_node/1,
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get_node/3, get_node/2, get_node/1, get_nodes/2,
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get_nodes/1, get_parentnodes/3, get_parentnodes_tree/3,
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get_subnodes/3, get_subnodes_tree/3, create_node/6,
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delete_node/2]).
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init(_Host, _ServerHost, _Opts) ->
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ok.
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terminate(_Host, _ServerHost) ->
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ok.
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options() ->
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[{virtual_tree, true}].
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set_node(_Node) ->
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ok.
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get_node(Host, Node, _From) ->
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get_node(Host, Node).
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get_node(Host, Node) ->
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Nidx = nodeidx(Host, Node),
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node_record(Host, Node, Nidx).
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get_node(Nidx) ->
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{Host, Node} = nodeid(Nidx),
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node_record(Host, Node, Nidx).
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get_nodes(Host, _From) ->
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get_nodes(Host).
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get_nodes(_Host) ->
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[].
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get_parentnodes(_Host, _Node, _From) ->
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[].
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get_parentnodes_tree(Host, Node, From) ->
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[{0, [get_node(Host, Node, From)]}].
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get_subnodes(Host, Node, _From) ->
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get_subnodes(Host, Node).
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get_subnodes(_Host, _Node) ->
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[].
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get_subnodes_tree(Host, Node, _From) ->
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get_subnodes_tree(Host, Node).
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get_subnodes_tree(_Host, _Node) ->
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[].
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create_node(Host, Node, _Type, _Owner, _Options, _Parents) ->
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{error, {virtual, nodeidx(Host, Node)}}.
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delete_node(Host, Node) ->
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[get_node(Host, Node)].
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%% internal helper
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node_record({U,S,R}, Node, Nidx) ->
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Host = mod_pubsub:host(S),
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Type = <<"pep">>,
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Module = mod_pubsub:plugin(Host, Type),
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#pubsub_node{nodeid = {{U,S,R},Node}, id = Nidx, type = Type,
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owners = [{U,S,R}],
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options = Module:options()};
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node_record(Host, Node, Nidx) ->
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[Type|_] = mod_pubsub:plugins(Host),
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Module = mod_pubsub:plugin(Host, Type),
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#pubsub_node{nodeid = {Host, Node}, id = Nidx, type = Type,
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owners = [{<<"">>, Host, <<"">>}],
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options = Module:options()}.
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nodeidx({U,S,R}, Node) ->
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JID = jid:encode(jid:make(U,S,R)),
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<<JID/binary, ":", Node/binary>>;
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nodeidx(Host, Node) ->
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<<Host/binary, ":", Node/binary>>.
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nodeid(Nidx) ->
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[Head, Node] = binary:split(Nidx, <<":">>),
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case jid:decode(Head) of
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{jid,<<>>,Host,<<>>,_,_,_} -> {Host, Node};
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{jid,U,S,R,_,_,_} -> {{U,S,R}, Node}
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end.
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