%%%----------------------------------------------------------------------
%%% File : ejabberd_s2s.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose :
%%% 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_lib("mnemosyne/include/mnemosyne.hrl").
-include("ejabberd.hrl").
-record(s2s, {fromto, node, key}).
-record(local_s2s, {fromto, pid}).
start_link() ->
{ok, proc_lib:spawn_link(ejabberd_s2s, init, [])}.
init() ->
register(ejabberd_s2s, self()),
mnesia:create_table(s2s,[{ram_copies, [node()]},
{attributes, record_info(fields, s2s)}]),
mnesia:add_table_index(session, node),
mnesia:create_table(local_s2s,
[{ram_copies, [node()]},
{local_content, true},
{attributes, record_info(fields, local_s2s)}]),
mnesia:add_table_copy(local_s2s, node(), ram_copies),
mnesia:subscribe(system),
loop().
loop() ->
receive
%{open_connection, User, Resource, From} ->
% replace_and_register_my_connection(User, Resource, From),
% replace_alien_connection(User, Resource),
% loop();
{closed_conection, FromTo} ->
remove_connection(FromTo),
loop();
%{replace, User, Resource} ->
% replace_my_connection(User, Resource),
% loop();
{mnesia_system_event, {mnesia_down, Node}} ->
clean_table_from_bad_node(Node),
loop();
{route, From, To, Packet} ->
do_route(From, To, Packet),
loop();
_ ->
loop()
end.
%open_session(User, Resource) ->
% ejabberd_s2s ! {open_session, User, Resource, self()}.
%
%close_session(User, Resource) ->
% ejabberd_s2s ! {close_session, User, Resource}.
remove_connection(FromTo) ->
F = fun() ->
mnesia:delete({local_s2s, FromTo}),
mnesia:delete({s2s, FromTo})
end,
mnesia:transaction(F).
clean_table_from_bad_node(Node) ->
F = fun() ->
Es = mnesia:index_read(s2s, Node, #s2s.node),
lists:foreach(fun(E) ->
mnesia:delete_object(s2s, E, write)
end, Es)
end,
mnesia:transaction(F).
%have_connection(FromTo) ->
% F = fun() ->
% [E] = mnesia:read({s2s, FromTo})
% end,
% case mnesia:transaction(F) of
% {atomic, _} ->
% true;
% _ ->
% false
% end.
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;
_ ->
""
end.
try_register(FromTo) ->
Key = randoms:get_string(),
F = fun() ->
case mnesia:read({s2s, FromTo}) of
[] ->
mnesia:write(#s2s{fromto = FromTo,
node = node(),
key = Key}),
mnesia:write(#local_s2s{fromto = FromTo,
pid = self()}),
{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]),
{_, MyServer, _} = From,
{User, Server, Resource} = To,
FromTo = {MyServer, Server},
Key = randoms:get_string(),
case find_connection(FromTo, Key) of
{atomic, {local, 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;
{atomic, {remote, Node}} ->
?DEBUG("sending to node ~p~n", [Node]),
{ejabberd_s2s, Node} ! {route, From, To, Packet},
ok;
{atomic, new} ->
?DEBUG("starting new s2s connection~n", []),
Pid = ejabberd_s2s_out:start(MyServer, Server, {new, Key}),
mnesia:transaction(fun() ->
mnesia:write(#local_s2s{fromto = FromTo,
pid = Pid})
end),
{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;
{atomic, not_exists} ->
?DEBUG("packet droped~n", []),
ok;
{aborted, Reason} ->
?DEBUG("delivery failed: ~p~n", [Reason]),
false
end.
find_connection(FromTo, Key) ->
F = fun() ->
case mnesia:read({local_s2s, FromTo}) of
[] ->
case mnesia:read({s2s, FromTo}) of
[Er] ->
{remote, Er#s2s.node};
[] ->
mnesia:write(#s2s{fromto = FromTo,
node = node(),
key = Key}),
new
end;
[El] ->
{local, El#local_s2s.pid}
end
end,
case catch mnesia:dirty_read({local_s2s, FromTo}) of
{'EXIT', Reason} ->
{aborted, Reason};
[] ->
case catch mnesia:dirty_read({s2s, FromTo}) of
[Er] ->
{atomic, {remote, Er#s2s.node}};
[] ->
mnesia:transaction(F)
end;
[El] ->
{atomic, {local, El#local_s2s.pid}}
end.
send_element(Pid, El) ->
Pid ! {send_element, El}.
dirty_get_connections() ->
mnesia:dirty_all_keys(s2s).
