Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_local.erl

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Erlang
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%%%----------------------------------------------------------------------
%%% File : ejabberd_local.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Route local packets
%%% Created : 30 Nov 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2014 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_local).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start_link/0]).
-export([route/3, route_iq/4, route_iq/5,
process_iq_reply/3, register_iq_handler/4,
register_iq_handler/5, register_iq_response_handler/4,
register_iq_response_handler/5, unregister_iq_handler/2,
unregister_iq_response_handler/2, refresh_iq_handlers/0,
bounce_resource_packet/3]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("jlib.hrl").
-record(state, {}).
-record(iq_response, {id = <<"">> :: binary(),
module :: atom(),
function :: atom() | fun(),
timer = make_ref() :: reference()}).
-define(IQTABLE, local_iqtable).
%% This value is used in SIP and Megaco for a transaction lifetime.
-define(IQ_TIMEOUT, 32000).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [],
[]).
process_iq(From, To, Packet) ->
IQ = jlib:iq_query_info(Packet),
case IQ of
#iq{xmlns = XMLNS} ->
Host = To#jid.lserver,
case ets:lookup(?IQTABLE, {XMLNS, Host}) of
[{_, Module, Function}] ->
ResIQ = Module:Function(From, To, IQ),
if ResIQ /= ignore ->
ejabberd_router:route(To, From, jlib:iq_to_xml(ResIQ));
true -> ok
end;
[{_, Module, Function, Opts}] ->
gen_iq_handler:handle(Host, Module, Function, Opts,
From, To, IQ);
[] ->
Err = jlib:make_error_reply(Packet,
?ERR_FEATURE_NOT_IMPLEMENTED),
ejabberd_router:route(To, From, Err)
end;
reply ->
IQReply = jlib:iq_query_or_response_info(Packet),
process_iq_reply(From, To, IQReply);
_ ->
Err = jlib:make_error_reply(Packet, ?ERR_BAD_REQUEST),
ejabberd_router:route(To, From, Err),
ok
end.
process_iq_reply(From, To, #iq{id = ID} = IQ) ->
case get_iq_callback(ID) of
{ok, undefined, Function} -> Function(IQ), ok;
{ok, Module, Function} ->
Module:Function(From, To, IQ), ok;
_ -> nothing
end.
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.
route_iq(From, To, IQ, F) ->
route_iq(From, To, IQ, F, undefined).
route_iq(From, To, #iq{type = Type} = IQ, F, Timeout)
when is_function(F) ->
Packet = if Type == set; Type == get ->
ID = randoms:get_string(),
Host = From#jid.lserver,
register_iq_response_handler(Host, ID, undefined, F, Timeout),
jlib:iq_to_xml(IQ#iq{id = ID});
true ->
jlib:iq_to_xml(IQ)
end,
ejabberd_router:route(From, To, Packet).
register_iq_response_handler(Host, ID, Module,
Function) ->
register_iq_response_handler(Host, ID, Module, Function,
undefined).
register_iq_response_handler(_Host, ID, Module,
Function, Timeout0) ->
Timeout = case Timeout0 of
undefined -> ?IQ_TIMEOUT;
N when is_integer(N), N > 0 -> N
end,
TRef = erlang:start_timer(Timeout, ejabberd_local, ID),
mnesia:dirty_write(#iq_response{id = ID,
module = Module,
function = Function,
timer = TRef}).
register_iq_handler(Host, XMLNS, Module, Fun) ->
ejabberd_local !
{register_iq_handler, Host, XMLNS, Module, Fun}.
register_iq_handler(Host, XMLNS, Module, Fun, Opts) ->
ejabberd_local !
{register_iq_handler, Host, XMLNS, Module, Fun, Opts}.
unregister_iq_response_handler(_Host, ID) ->
catch get_iq_callback(ID), ok.
unregister_iq_handler(Host, XMLNS) ->
ejabberd_local ! {unregister_iq_handler, Host, XMLNS}.
refresh_iq_handlers() ->
ejabberd_local ! refresh_iq_handlers.
bounce_resource_packet(From, To, Packet) ->
Err = jlib:make_error_reply(Packet,
?ERR_ITEM_NOT_FOUND),
ejabberd_router:route(To, From, Err),
stop.
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
lists:foreach(fun (Host) ->
ejabberd_router:register_route(Host,
{apply, ?MODULE,
route}),
ejabberd_hooks:add(local_send_to_resource_hook, Host,
?MODULE, bounce_resource_packet,
100)
end,
?MYHOSTS),
catch ets:new(?IQTABLE, [named_table, public]),
update_table(),
mnesia:create_table(iq_response,
[{ram_copies, [node()]},
{attributes, record_info(fields, iq_response)}]),
mnesia:add_table_copy(iq_response, node(), ram_copies),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call(_Request, _From, State) ->
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
Reply = ok, {reply, Reply, State}.
handle_cast(_Msg, State) -> {noreply, State}.
handle_info({route, From, To, Packet}, State) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ -> ok
end,
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module,
Function},
State) ->
ets:insert(?IQTABLE, {{XMLNS, Host}, Module, Function}),
catch mod_disco:register_feature(Host, XMLNS),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module,
Function, Opts},
State) ->
ets:insert(?IQTABLE,
{{XMLNS, Host}, Module, Function, Opts}),
catch mod_disco:register_feature(Host, XMLNS),
{noreply, State};
handle_info({unregister_iq_handler, Host, XMLNS},
State) ->
case ets:lookup(?IQTABLE, {XMLNS, Host}) of
[{_, Module, Function, Opts}] ->
gen_iq_handler:stop_iq_handler(Module, Function, Opts);
_ -> ok
end,
ets:delete(?IQTABLE, {XMLNS, Host}),
catch mod_disco:unregister_feature(Host, XMLNS),
{noreply, State};
handle_info(refresh_iq_handlers, State) ->
lists:foreach(fun (T) ->
case T of
{{XMLNS, Host}, _Module, _Function, _Opts} ->
catch mod_disco:register_feature(Host, XMLNS);
{{XMLNS, Host}, _Module, _Function} ->
catch mod_disco:register_feature(Host, XMLNS);
_ -> ok
end
end,
ets:tab2list(?IQTABLE)),
{noreply, State};
handle_info({timeout, _TRef, ID}, State) ->
process_iq_timeout(ID),
{noreply, State};
%%--------------------------------------------------------------------
%% Function: terminate(Reason, State) -> void()
%% Description: This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any necessary
%% cleaning up. When it returns, the gen_server terminates with Reason.
%% The return value is ignored.
%%--------------------------------------------------------------------
%%--------------------------------------------------------------------
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, _State) -> ok.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
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.
update_table() ->
case catch mnesia:table_info(iq_response, attributes) of
[id, module, function] ->
mnesia:delete_table(iq_response);
[id, module, function, timer] ->
ok;
{'EXIT', _} ->
ok
end.
get_iq_callback(ID) ->
case mnesia:dirty_read(iq_response, ID) of
[#iq_response{module = Module, timer = TRef,
function = Function}] ->
cancel_timer(TRef),
mnesia:dirty_delete(iq_response, ID),
{ok, Module, Function};
_ ->
error
end.
process_iq_timeout(ID) ->
spawn(fun process_iq_timeout/0) ! ID.
process_iq_timeout() ->
receive
ID ->
case get_iq_callback(ID) of
{ok, undefined, Function} ->
Function(timeout);
_ ->
ok
end
after 5000 ->
ok
end.
cancel_timer(TRef) ->
case erlang:cancel_timer(TRef) of
false ->
receive {timeout, TRef, _} -> ok after 0 -> ok end;
_ -> ok
end.
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