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%%%----------------------------------------------------------------------
%%% File : ejabberd_s2s.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : S2S connections manager
%%% Created : 7 Dec 2002 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(ejabberd_s2s).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([start_link/0, init/0,
have_connection/1,
get_key/1,
try_register/1,
dirty_get_connections/0]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-record(s2s, {fromto, pid, key}).
start_link() ->
Pid = proc_lib:spawn_link(ejabberd_s2s, init, []),
register(ejabberd_s2s, Pid),
{ok, Pid}.
init() ->
update_tables(),
mnesia:create_table(s2s,[{ram_copies, [node()]},
{attributes, record_info(fields, s2s)}]),
mnesia:add_table_copy(s2s, node(), ram_copies),
mnesia:subscribe(system),
loop().
loop() ->
receive
{closed_conection, FromTo} ->
remove_connection(FromTo),
loop();
{mnesia_system_event, {mnesia_down, Node}} ->
clean_table_from_bad_node(Node),
loop();
{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();
_ ->
loop()
end.
remove_connection(FromTo) ->
F = fun() ->
mnesia:delete({s2s, FromTo})
end,
mnesia:transaction(F).
clean_table_from_bad_node(Node) ->
F = fun() ->
Es = mnesia:select(
s2s,
[{#s2s{pid = '$1', _ = '_'},
[{'==', {node, '$1'}, Node}],
['$_']}]),
lists:foreach(fun(E) ->
mnesia:delete_object(E)
end, Es)
end,
mnesia:transaction(F).
have_connection(FromTo) ->
case catch mnesia:dirty_read(s2s, FromTo) of
[_] ->
true;
_ ->
false
end.
get_key(FromTo) ->
case catch mnesia:dirty_read(s2s, FromTo) of
[E] ->
E#s2s.key;
_ ->
error
end.
try_register(FromTo) ->
Key = randoms:get_string(),
F = fun() ->
case mnesia:read({s2s, FromTo}) of
[] ->
mnesia:write(#s2s{fromto = FromTo,
pid = self(),
key = Key}),
{key, Key};
_ ->
false
end
end,
case mnesia:transaction(F) of
{atomic, Res} ->
Res;
_ ->
false
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
do_route(From, To, Packet) ->
?DEBUG("s2s manager~n\tfrom ~p~n\tto ~p~n\tpacket ~P~n",
[From, To, Packet, 8]),
case find_connection(From, To) of
{atomic, Pid} when pid(Pid) ->
?DEBUG("sending to process ~p~n", [Pid]),
% TODO
{xmlelement, Name, Attrs, Els} = Packet,
NewAttrs = jlib:replace_from_to_attrs(jlib:jid_to_string(From),
jlib:jid_to_string(To),
Attrs),
send_element(Pid, {xmlelement, Name, NewAttrs, Els}),
ok;
{aborted, Reason} ->
?DEBUG("delivery failed: ~p~n", [Reason]),
false
end.
find_connection(From, To) ->
#jid{lserver = MyServer} = From,
#jid{lserver = Server} = To,
FromTo = {MyServer, Server},
case catch mnesia:dirty_read(s2s, FromTo) of
{'EXIT', Reason} ->
{aborted, Reason};
[] ->
?DEBUG("starting new s2s connection~n", []),
Key = randoms:get_string(),
{ok, Pid} = ejabberd_s2s_out:start(MyServer, Server, {new, Key}),
F = fun() ->
case mnesia:read({s2s, FromTo}) of
[El] ->
El#s2s.pid;
[] ->
mnesia:write(#s2s{fromto = FromTo,
pid = Pid,
key = Key}),
Pid
end
end,
mnesia:transaction(F);
[El] ->
{atomic, El#s2s.pid}
end.
send_element(Pid, El) ->
Pid ! {send_element, El}.
dirty_get_connections() ->
mnesia:dirty_all_keys(s2s).
update_tables() ->
case catch mnesia:table_info(s2s, attributes) of
[fromto, node, key] ->
mnesia:transform_table(s2s, ignore, [fromto, pid, key]),
mnesia:clear_table(s2s);
[fromto, pid, key] ->
ok;
{'EXIT', _} ->
ok
end,
case lists:member(local_s2s, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(local_s2s);
false ->
ok
end.
|
