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%%%----------------------------------------------------------------------
%%% File : ejabberd_router.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Main router
%%% Created : 27 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(ejabberd_router).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([route/3,
register_route/1,
unregister_route/1,
dirty_get_all_routes/0,
dirty_get_all_domains/0
]).
-export([start_link/0, init/0]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-record(route, {domain, pid}).
start_link() ->
Pid = proc_lib:spawn_link(ejabberd_router, init, []),
register(ejabberd_router, Pid),
{ok, Pid}.
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}),
loop().
loop() ->
receive
{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,
loop();
{register_route, Domain, Pid} ->
F = fun() ->
mnesia:write(#route{domain = Domain,
pid = Pid})
end,
mnesia:transaction(F),
loop();
{unregister_route, Domain, Pid} ->
F = fun() ->
mnesia:delete_object(#route{domain = Domain,
pid = Pid})
end,
mnesia:transaction(F),
loop();
{mnesia_table_event, {write, #route{pid = Pid}, _ActivityId}} ->
erlang:monitor(process, Pid),
loop();
{'DOWN', _Ref, _Type, Pid, _Info} ->
F = fun() ->
Es = mnesia:select(
route,
[{#route{pid = Pid, _ = '_'},
[],
['$_']}]),
lists:foreach(fun(E) ->
mnesia:delete_object(E)
end, Es)
end,
mnesia:transaction(F),
loop();
_ ->
loop()
end.
do_route(From, To, Packet) ->
?DEBUG("route~n\tfrom ~p~n\tto ~p~n\tpacket ~p~n", [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,
?DEBUG("routed to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet};
Rs ->
Rs1 = case [R || R <- Rs, node(R#route.pid) == node()] of
[] -> Rs;
LRs -> LRs
end,
R = lists:nth(erlang:phash(now(), length(Rs1)), Rs1),
Pid = R#route.pid,
?DEBUG("routed to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet}
end.
route(From, To, Packet) ->
ejabberd_router ! {route, From, To, Packet}.
register_route(Domain) ->
ejabberd_router ! {register_route, Domain, self()}.
unregister_route(Domain) ->
ejabberd_router ! {unregister_route, Domain, self()}.
dirty_get_all_routes() ->
lists:delete(?MYNAME, lists:usort(mnesia:dirty_all_keys(route))).
dirty_get_all_domains() ->
lists:usort(mnesia:dirty_all_keys(route)).
update_tables() ->
case catch mnesia:table_info(route, attributes) of
[domain, node, pid] ->
mnesia:delete_table(route);
[domain, pid] ->
ok;
{'EXIT', _} ->
ok
end,
case lists:member(local_route, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(local_route);
false ->
ok
end.
|
