278 lines
8.4 KiB
Erlang
278 lines
8.4 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_s2s.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose : S2S connections manager
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%%% Created : 7 Dec 2002 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(ejabberd_s2s).
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-author('alexey@sevcom.net').
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-vsn('$Revision$ ').
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-behaviour(gen_server).
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%% API
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-export([start_link/0,
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route/3,
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have_connection/1,
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get_key/1,
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try_register/1,
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remove_connection/1,
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dirty_get_connections/0,
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ctl_process/2
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]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-include("ejabberd_ctl.hrl").
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-record(s2s, {fromto, pid, key}).
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-record(state, {}).
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%%====================================================================
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%% API
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
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%% Description: Starts the server
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%%--------------------------------------------------------------------
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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route(From, To, Packet) ->
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case catch do_route(From, To, Packet) of
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{'EXIT', Reason} ->
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?ERROR_MSG("~p~nwhen processing: ~p",
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[Reason, {From, To, Packet}]);
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_ ->
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ok
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end.
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remove_connection(FromTo) ->
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F = fun() ->
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mnesia:delete({s2s, FromTo})
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end,
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mnesia:transaction(F).
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have_connection(FromTo) ->
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case catch mnesia:dirty_read(s2s, FromTo) of
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[_] ->
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true;
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_ ->
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false
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end.
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get_key(FromTo) ->
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case catch mnesia:dirty_read(s2s, FromTo) of
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[E] ->
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E#s2s.key;
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_ ->
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error
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end.
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try_register(FromTo) ->
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Key = randoms:get_string(),
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F = fun() ->
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case mnesia:read({s2s, FromTo}) of
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[] ->
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mnesia:write(#s2s{fromto = FromTo,
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pid = self(),
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key = Key}),
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{key, Key};
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_ ->
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false
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end
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end,
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case mnesia:transaction(F) of
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{atomic, Res} ->
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Res;
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_ ->
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false
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end.
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dirty_get_connections() ->
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mnesia:dirty_all_keys(s2s).
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init(Args) -> {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%% Description: Initiates the server
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%%--------------------------------------------------------------------
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init([]) ->
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update_tables(),
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mnesia:create_table(s2s, [{ram_copies, [node()]},
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{attributes, record_info(fields, s2s)}]),
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mnesia:add_table_copy(s2s, node(), ram_copies),
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mnesia:subscribe(system),
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ejabberd_ctl:register_commands(
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[{"incoming-s2s-number", "print number of incoming s2s connections on the node"},
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{"outgoing-s2s-number", "print number of outgoing s2s connections on the node"}],
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?MODULE, ctl_process),
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{ok, #state{}}.
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%%--------------------------------------------------------------------
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%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} |
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%% {stop, Reason, State}
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%% Description: Handling call messages
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%%--------------------------------------------------------------------
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_cast(Msg, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling cast messages
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%%--------------------------------------------------------------------
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handle_cast(_Msg, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info(Info, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling all non call/cast messages
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%%--------------------------------------------------------------------
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handle_info({mnesia_system_event, {mnesia_down, Node}}, State) ->
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clean_table_from_bad_node(Node),
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{noreply, State};
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handle_info({route, From, To, Packet}, State) ->
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case catch do_route(From, To, Packet) of
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{'EXIT', Reason} ->
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?ERROR_MSG("~p~nwhen processing: ~p",
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[Reason, {From, To, Packet}]);
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_ ->
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ok
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end,
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{noreply, State};
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handle_info(_Info, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate(Reason, State) -> void()
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%% Description: This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any necessary
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%% cleaning up. When it returns, the gen_server terminates with Reason.
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%% The return value is ignored.
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%%--------------------------------------------------------------------
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terminate(_Reason, _State) ->
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ok.
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%%--------------------------------------------------------------------
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%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
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%% Description: Convert process state when code is changed
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%%--------------------------------------------------------------------
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%--------------------------------------------------------------------
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%%% Internal functions
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%%--------------------------------------------------------------------
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clean_table_from_bad_node(Node) ->
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F = fun() ->
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Es = mnesia:select(
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s2s,
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[{#s2s{pid = '$1', _ = '_'},
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[{'==', {node, '$1'}, Node}],
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['$_']}]),
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lists:foreach(fun(E) ->
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mnesia:delete_object(E)
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end, Es)
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end,
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mnesia:transaction(F).
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do_route(From, To, Packet) ->
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?DEBUG("s2s manager~n\tfrom ~p~n\tto ~p~n\tpacket ~P~n",
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[From, To, Packet, 8]),
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case find_connection(From, To) of
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{atomic, Pid} when pid(Pid) ->
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?DEBUG("sending to process ~p~n", [Pid]),
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% TODO
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{xmlelement, Name, Attrs, Els} = Packet,
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NewAttrs = jlib:replace_from_to_attrs(jlib:jid_to_string(From),
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jlib:jid_to_string(To),
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Attrs),
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send_element(Pid, {xmlelement, Name, NewAttrs, Els}),
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ok;
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{aborted, Reason} ->
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?DEBUG("delivery failed: ~p~n", [Reason]),
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false
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end.
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find_connection(From, To) ->
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#jid{lserver = MyServer} = From,
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#jid{lserver = Server} = To,
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FromTo = {MyServer, Server},
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case catch mnesia:dirty_read(s2s, FromTo) of
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{'EXIT', Reason} ->
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{aborted, Reason};
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[] ->
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?DEBUG("starting new s2s connection~n", []),
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Key = randoms:get_string(),
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{ok, Pid} = ejabberd_s2s_out:start(MyServer, Server, {new, Key}),
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F = fun() ->
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case mnesia:read({s2s, FromTo}) of
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[El] ->
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El#s2s.pid;
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[] ->
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mnesia:write(#s2s{fromto = FromTo,
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pid = Pid,
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key = Key}),
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Pid
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end
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end,
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TRes = mnesia:transaction(F),
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ejabberd_s2s_out:start_connection(Pid),
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TRes;
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[El] ->
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{atomic, El#s2s.pid}
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end.
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send_element(Pid, El) ->
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Pid ! {send_element, El}.
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ctl_process(_Val, ["incoming-s2s-number"]) ->
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N = length(supervisor:which_children(ejabberd_s2s_in_sup)),
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io:format("~p~n", [N]),
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{stop, ?STATUS_SUCCESS};
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ctl_process(_Val, ["outgoing-s2s-number"]) ->
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N = length(supervisor:which_children(ejabberd_s2s_out_sup)),
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io:format("~p~n", [N]),
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{stop, ?STATUS_SUCCESS};
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ctl_process(Val, _Args) ->
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Val.
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update_tables() ->
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case catch mnesia:table_info(s2s, attributes) of
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[fromto, node, key] ->
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mnesia:transform_table(s2s, ignore, [fromto, pid, key]),
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mnesia:clear_table(s2s);
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[fromto, pid, key] ->
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ok;
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{'EXIT', _} ->
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ok
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end,
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case lists:member(local_s2s, mnesia:system_info(tables)) of
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true ->
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mnesia:delete_table(local_s2s);
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false ->
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ok
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end.
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