mirror of
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258 lines
8.2 KiB
Erlang
258 lines
8.2 KiB
Erlang
%%% ====================================================================
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%%% ``The contents of this file are subject to the Erlang Public License,
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%%% Version 1.1, (the "License"); you may not use this file except in
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%%% compliance with the License. You should have received a copy of the
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%%% Erlang Public License along with this software. If not, it can be
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%%% retrieved via the world wide web at http://www.erlang.org/.
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%%%
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%%% Software distributed under the License is distributed on an "AS IS"
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%%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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%%% the License for the specific language governing rights and limitations
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%%% under the License.
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%%%
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%%% The Initial Developer of the Original Code is ProcessOne.
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%%% Portions created by ProcessOne are Copyright 2006-2010, ProcessOne
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%%% All Rights Reserved.''
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%%% This software is copyright 2006-2010, ProcessOne.
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%%%
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%%%
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%%% @copyright 2006-2010 ProcessOne
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%%% @author Christophe Romain <christophe.romain@process-one.net>
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%%% [http://www.process-one.net/]
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%%% @version {@vsn}, {@date} {@time}
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%%% @end
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%%% ====================================================================
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%%% @doc The module <strong>{@module}</strong> is the default PubSub node tree plugin.
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%%% <p>It is used as a default for all unknown PubSub node type. It can serve
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%%% as a developer basis and reference to build its own custom pubsub node tree
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%%% types.</p>
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%%% <p>PubSub node tree plugins are using the {@link gen_nodetree} behaviour.</p>
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%%% <p><strong>The API isn't stabilized yet</strong>. The pubsub plugin
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%%% development is still a work in progress. However, the system is already
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%%% useable and useful as is. Please, send us comments, feedback and
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%%% improvements.</p>
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-module(nodetree_tree).
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-author('christophe.romain@process-one.net').
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-include_lib("stdlib/include/qlc.hrl").
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-include("pubsub.hrl").
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-include("jlib.hrl").
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-behaviour(gen_pubsub_nodetree).
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-export([init/3,
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terminate/2,
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options/0,
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set_node/1,
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get_node/3,
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get_node/2,
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get_node/1,
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get_nodes/2,
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get_nodes/1,
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get_parentnodes/3,
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get_parentnodes_tree/3,
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get_subnodes/3,
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get_subnodes_tree/3,
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create_node/6,
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delete_node/2
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]).
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%% ================
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%% API definition
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%% ================
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%% @spec (Host, ServerHost, Opts) -> any()
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%% Host = mod_pubsub:host()
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%% ServerHost = host()
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%% Opts = list()
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%% @doc <p>Called during pubsub modules initialisation. Any pubsub plugin must
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%% implement this function. It can return anything.</p>
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%% <p>This function is mainly used to trigger the setup task necessary for the
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%% plugin. It can be used for example by the developer to create the specific
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%% module database schema if it does not exists yet.</p>
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init(_Host, _ServerHost, _Opts) ->
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mnesia:create_table(pubsub_node,
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[{disc_copies, [node()]},
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{attributes, record_info(fields, pubsub_node)}]),
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mnesia:add_table_index(pubsub_node, id),
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NodesFields = record_info(fields, pubsub_node),
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case mnesia:table_info(pubsub_node, attributes) of
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NodesFields -> ok;
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_ ->
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ok
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%% mnesia:transform_table(pubsub_state, ignore, StatesFields)
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end,
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ok.
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terminate(_Host, _ServerHost) ->
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ok.
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%% @spec () -> [Option]
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%% Option = mod_pubsub:nodetreeOption()
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%% @doc Returns the default pubsub node tree options.
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options() ->
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[{virtual_tree, false}].
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%% @spec (NodeRecord) -> ok | {error, Reason}
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%% Record = mod_pubsub:pubsub_node()
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set_node(Record) when is_record(Record, pubsub_node) ->
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mnesia:write(Record);
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set_node(_) ->
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{error, ?ERR_INTERNAL_SERVER_ERROR}.
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get_node(Host, Node, _From) ->
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get_node(Host, Node).
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%% @spec (Host, Node) -> pubsubNode() | {error, Reason}
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%% Host = mod_pubsub:host()
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%% Node = mod_pubsub:pubsubNode()
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get_node(Host, Node) ->
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case catch mnesia:read({pubsub_node, {Host, Node}}) of
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[Record] when is_record(Record, pubsub_node) -> Record;
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[] -> {error, ?ERR_ITEM_NOT_FOUND};
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Error -> Error
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end.
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get_node(NodeId) ->
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case catch mnesia:index_read(pubsub_node, NodeId, #pubsub_node.id) of
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[Record] when is_record(Record, pubsub_node) -> Record;
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[] -> {error, ?ERR_ITEM_NOT_FOUND};
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Error -> Error
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end.
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get_nodes(Host, _From) ->
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get_nodes(Host).
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%% @spec (Host) -> [pubsubNode()] | {error, Reason}
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%% Host = mod_pubsub:host() | mod_pubsub:jid()
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get_nodes(Host) ->
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mnesia:match_object(#pubsub_node{nodeid = {Host, '_'}, _ = '_'}).
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%% @spec (Host, Node, From) -> [{Depth, Record}] | {error, Reason}
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%% Host = mod_pubsub:host() | mod_pubsub:jid()
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%% Node = mod_pubsub:pubsubNode()
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%% From = mod_pubsub:jid()
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%% Depth = integer()
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%% Record = pubsubNode()
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%% @doc <p>Default node tree does not handle parents, return empty list.</p>
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get_parentnodes(_Host, _Node, _From) ->
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[].
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%% @spec (Host, Node, From) -> [{Depth, Record}] | {error, Reason}
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%% Host = mod_pubsub:host() | mod_pubsub:jid()
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%% Node = mod_pubsub:pubsubNode()
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%% From = mod_pubsub:jid()
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%% Depth = integer()
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%% Record = pubsubNode()
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%% @doc <p>Default node tree does not handle parents, return a list
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%% containing just this node.</p>
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get_parentnodes_tree(Host, Node, From) ->
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case get_node(Host, Node, From) of
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N when is_record(N, pubsub_node) -> [{0, [N]}];
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_Error -> []
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end.
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%% @spec (Host, Node, From) -> [pubsubNode()] | {error, Reason}
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%% Host = mod_pubsub:host()
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%% Node = mod_pubsub:pubsubNode()
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%% From = mod_pubsub:jid()
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get_subnodes(Host, Node, _From) ->
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get_subnodes(Host, Node).
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get_subnodes(Host, <<>>) ->
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Q = qlc:q([N || #pubsub_node{nodeid = {NHost, _},
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parents = Parents} = N <- mnesia:table(pubsub_node),
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Host == NHost,
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Parents == []]),
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qlc:e(Q);
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get_subnodes(Host, Node) ->
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Q = qlc:q([N || #pubsub_node{nodeid = {NHost, _},
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parents = Parents} = N <- mnesia:table(pubsub_node),
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Host == NHost,
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lists:member(Node, Parents)]),
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qlc:e(Q).
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get_subnodes_tree(Host, Node, _From) ->
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get_subnodes_tree(Host, Node).
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%% @spec (Host, Index) -> [pubsubNodeIdx()] | {error, Reason}
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%% Host = mod_pubsub:host()
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%% Node = mod_pubsub:pubsubNode()
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%% From = mod_pubsub:jid()
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get_subnodes_tree(Host, Node) ->
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case get_node(Host, Node) of
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{error, _} ->
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[];
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Rec ->
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BasePlugin = list_to_atom("node_"++Rec#pubsub_node.type),
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BasePath = BasePlugin:node_to_path(Node),
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mnesia:foldl(fun(#pubsub_node{nodeid = {H, N}} = R, Acc) ->
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Plugin = list_to_atom("node_"++R#pubsub_node.type),
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Path = Plugin:node_to_path(N),
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case lists:prefix(BasePath, Path) and (H == Host) of
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true -> [R | Acc];
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false -> Acc
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end
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end, [], pubsub_node)
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end.
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%% @spec (Host, Node, Type, Owner, Options, Parents) -> ok | {error, Reason}
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%% Host = mod_pubsub:host() | mod_pubsub:jid()
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%% Node = mod_pubsub:pubsubNode()
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%% NodeType = mod_pubsub:nodeType()
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%% Owner = mod_pubsub:jid()
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%% Options = list()
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create_node(Host, Node, Type, Owner, Options, Parents) ->
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BJID = jlib:jid_tolower(jlib:jid_remove_resource(Owner)),
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case catch mnesia:read({pubsub_node, {Host, Node}}) of
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[] ->
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ParentExists =
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case Host of
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{_U, _S, _R} ->
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%% This is special case for PEP handling
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%% PEP does not uses hierarchy
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true;
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_ ->
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case Parents of
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[] -> true;
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[Parent|_] ->
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case catch mnesia:read({pubsub_node, {Host, Parent}}) of
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[#pubsub_node{owners = [{[], Host, []}]}] -> true;
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[#pubsub_node{owners = Owners}] -> lists:member(BJID, Owners);
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_ -> false
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end;
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_ ->
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false
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end
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end,
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case ParentExists of
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true ->
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NodeId = pubsub_index:new(node),
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mnesia:write(#pubsub_node{nodeid = {Host, Node},
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id = NodeId,
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parents = Parents,
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type = Type,
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owners = [BJID],
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options = Options}),
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{ok, NodeId};
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false ->
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%% Requesting entity is prohibited from creating nodes
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{error, ?ERR_FORBIDDEN}
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end;
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_ ->
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%% NodeID already exists
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{error, ?ERR_CONFLICT}
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end.
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%% @spec (Host, Node) -> [mod_pubsub:node()]
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%% Host = mod_pubsub:host() | mod_pubsub:jid()
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%% Node = mod_pubsub:pubsubNode()
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delete_node(Host, Node) ->
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Removed = get_subnodes_tree(Host, Node),
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lists:foreach(fun(#pubsub_node{nodeid = {_, N}, id = I}) ->
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pubsub_index:free(node, I),
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mnesia:delete({pubsub_node, {Host, N}})
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end, Removed),
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Removed.
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