Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_router.erl
Christophe Romain f39ccd73c5 Merge remote branch 'mainline/2.1.x' into 2.2.x
2011-02-14 13:54:06 +01:00

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%%%----------------------------------------------------------------------
%%% File : ejabberd_router.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Main router
%%% Created : 27 Nov 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2011 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_router).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([route/3,
route_error/4,
register_route/1,
register_route/2,
register_routes/1,
unregister_route/1,
unregister_routes/1,
dirty_get_all_routes/0,
dirty_get_all_domains/0,
make_id/0
]).
-export([start_link/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-record(route, {domain, pid, local_hint}).
-record(state, {}).
%% "rr" stands for Record-Route.
-define(ROUTE_PREFIX, "rr-").
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
route(From, To, Packet) ->
case catch route_check_id(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end.
%% Route the error packet only if the originating packet is not an error itself.
%% RFC3920 9.3.1
route_error(From, To, ErrPacket, OrigPacket) ->
{xmlelement, _Name, Attrs, _Els} = OrigPacket,
case "error" == xml:get_attr_s("type", Attrs) of
false ->
route(From, To, ErrPacket);
true ->
ok
end.
register_route(Domain) ->
register_route(Domain, undefined).
register_route(Domain, LocalHint) ->
case jlib:nameprep(Domain) of
error ->
erlang:error({invalid_domain, Domain});
LDomain ->
Pid = self(),
case get_component_number(LDomain) of
undefined ->
F = fun() ->
mnesia:write(#route{domain = LDomain,
pid = Pid,
local_hint = LocalHint})
end,
mnesia:transaction(F);
N ->
F = fun() ->
case mnesia:wread({route, LDomain}) of
[] ->
mnesia:write(
#route{domain = LDomain,
pid = Pid,
local_hint = 1}),
lists:foreach(
fun(I) ->
mnesia:write(
#route{domain = LDomain,
pid = undefined,
local_hint = I})
end, lists:seq(2, N));
Rs ->
lists:any(
fun(#route{pid = undefined,
local_hint = I} = R) ->
mnesia:write(
#route{domain = LDomain,
pid = Pid,
local_hint = I}),
mnesia:delete_object(R),
true;
(_) ->
false
end, Rs)
end
end,
mnesia:transaction(F)
end
end.
register_routes(Domains) ->
lists:foreach(fun(Domain) ->
register_route(Domain)
end, Domains).
unregister_route(Domain) ->
case jlib:nameprep(Domain) of
error ->
erlang:error({invalid_domain, Domain});
LDomain ->
Pid = self(),
case get_component_number(LDomain) of
undefined ->
F = fun() ->
case mnesia:match_object(
#route{domain = LDomain,
pid = Pid,
_ = '_'}) of
[R] ->
mnesia:delete_object(R);
_ ->
ok
end
end,
mnesia:transaction(F);
_ ->
F = fun() ->
case mnesia:match_object(#route{domain=LDomain,
pid = Pid,
_ = '_'}) of
[R] ->
I = R#route.local_hint,
mnesia:write(
#route{domain = LDomain,
pid = undefined,
local_hint = I}),
mnesia:delete_object(R);
_ ->
ok
end
end,
mnesia:transaction(F)
end
end.
unregister_routes(Domains) ->
lists:foreach(fun(Domain) ->
unregister_route(Domain)
end, Domains).
dirty_get_all_routes() ->
lists:usort(mnesia:dirty_all_keys(route)) -- ?MYHOSTS.
dirty_get_all_domains() ->
lists:usort(mnesia:dirty_all_keys(route)).
make_id() ->
?ROUTE_PREFIX ++ randoms:get_string() ++ "-" ++ ejabberd_cluster:node_id().
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
update_tables(),
mnesia:create_table(route,
[{ram_copies, [node()]},
{type, bag},
{attributes,
record_info(fields, route)}]),
mnesia:add_table_copy(route, node(), ram_copies),
mnesia:subscribe({table, route, simple}),
lists:foreach(
fun(Pid) ->
erlang:monitor(process, Pid)
end,
mnesia:dirty_select(route, [{{route, '_', '$1', '_'}, [], ['$1']}])),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
handle_info({route, From, To, Packet}, State) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end,
{noreply, State};
handle_info({mnesia_table_event, {write, #route{pid = Pid}, _ActivityId}},
State) ->
erlang:monitor(process, Pid),
{noreply, State};
handle_info({'DOWN', _Ref, _Type, Pid, _Info}, State) ->
F = fun() ->
Es = mnesia:select(
route,
[{#route{pid = Pid, _ = '_'},
[],
['$_']}]),
lists:foreach(
fun(E) ->
if
is_integer(E#route.local_hint) ->
LDomain = E#route.domain,
I = E#route.local_hint,
mnesia:write(
#route{domain = LDomain,
pid = undefined,
local_hint = I}),
mnesia:delete_object(E);
true ->
mnesia:delete_object(E)
end
end, Es)
end,
mnesia:transaction(F),
{noreply, State};
handle_info(_Info, State) ->
{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.
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
route_check_id(From, To, {xmlelement, "iq", Attrs, _} = Packet) ->
case xml:get_attr_s("id", Attrs) of
?ROUTE_PREFIX ++ Rest ->
Type = xml:get_attr_s("type", Attrs),
if Type == "error"; Type == "result" ->
case string:tokens(Rest, "-") of
[_, NodeID] ->
case ejabberd_cluster:get_node_by_id(NodeID) of
Node when Node == node() ->
do_route(From, To, Packet);
Node ->
{ejabberd_router, Node} !
{route, From, To, Packet}
end;
_ ->
do_route(From, To, Packet)
end;
true ->
do_route(From, To, Packet)
end;
_ ->
do_route(From, To, Packet)
end;
route_check_id(From, To, Packet) ->
do_route(From, To, Packet).
do_route(OrigFrom, OrigTo, OrigPacket) ->
?DEBUG("route~n\tfrom ~p~n\tto ~p~n\tpacket ~p~n",
[OrigFrom, OrigTo, OrigPacket]),
case ejabberd_hooks:run_fold(filter_packet,
{OrigFrom, OrigTo, OrigPacket}, []) of
{From, To, Packet} ->
LDstDomain = To#jid.lserver,
case mnesia:dirty_read(route, LDstDomain) of
[] ->
ejabberd_s2s:route(From, To, Packet);
[R] ->
Pid = R#route.pid,
if
node(Pid) == node() ->
case R#route.local_hint of
{apply, Module, Function} ->
Module:Function(From, To, Packet);
_ ->
Pid ! {route, From, To, Packet}
end;
is_pid(Pid) ->
Pid ! {route, From, To, Packet};
true ->
drop
end;
Rs ->
Value = case ejabberd_config:get_local_option(
{domain_balancing, LDstDomain}) of
undefined -> now();
random -> now();
source -> jlib:jid_tolower(From);
destination -> jlib:jid_tolower(To);
bare_source ->
jlib:jid_remove_resource(
jlib:jid_tolower(From));
bare_destination ->
jlib:jid_remove_resource(
jlib:jid_tolower(To))
end,
case get_component_number(LDstDomain) of
undefined ->
case [R || R <- Rs, node(R#route.pid) == node()] of
[] ->
R = lists:nth(erlang:phash(Value, length(Rs)), Rs),
Pid = R#route.pid,
if
is_pid(Pid) ->
Pid ! {route, From, To, Packet};
true ->
drop
end;
LRs ->
R = lists:nth(erlang:phash(Value, length(LRs)), LRs),
Pid = R#route.pid,
case R#route.local_hint of
{apply, Module, Function} ->
Module:Function(From, To, Packet);
_ ->
Pid ! {route, From, To, Packet}
end
end;
_ ->
SRs = lists:ukeysort(#route.local_hint, Rs),
R = lists:nth(erlang:phash(Value, length(SRs)), SRs),
Pid = R#route.pid,
if
is_pid(Pid) ->
Pid ! {route, From, To, Packet};
true ->
drop
end
end
end;
drop ->
?DEBUG("packet dropped~n", []),
ok
end.
get_component_number(LDomain) ->
case ejabberd_config:get_local_option(
{domain_balancing_component_number, LDomain}) of
N when is_integer(N),
N > 1 ->
N;
_ ->
undefined
end.
update_tables() ->
case catch mnesia:table_info(route, attributes) of
[domain, node, pid] ->
mnesia:delete_table(route);
[domain, pid] ->
mnesia:delete_table(route);
[domain, pid, local_hint] ->
ok;
{'EXIT', _} ->
ok
end,
case lists:member(local_route, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(local_route);
false ->
ok
end.
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