% M2UA / M3UA / SUA AS gsn_fsm according to RFC3868 4.3.1 % (C) 2011-2012 by Harald Welte % % All Rights Reserved % % This program is free software; you can redistribute it and/or modify % it under the terms of the GNU Affero General Public License as % published by the Free Software Foundation; either version 3 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 Affero General Public License % along with this program. If not, see . % % Additional Permission under GNU AGPL version 3 section 7: % % If you modify this Program, or any covered work, by linking or % combining it with runtime libraries of Erlang/OTP as released by % Ericsson on https://www.erlang.org (or a modified version of these % libraries), containing parts covered by the terms of the Erlang Public % License (https://www.erlang.org/EPLICENSE), the licensors of this % Program grant you additional permission to convey the resulting work % without the need to license the runtime libraries of Erlang/OTP under % the GNU Affero General Public License. Corresponding Source for a % non-source form of such a combination shall include the source code % for the parts of the runtime libraries of Erlang/OTP used as well as % that of the covered work. -module(xua_as_fsm). -author('Harald Welte '). -behaviour(gen_fsm). -include("osmo_util.hrl"). -include("m3ua.hrl"). % gen_fsm exports -export([init/1, terminate/3, code_change/4, handle_event/3, handle_sync_event/4, handle_info/3]). % states in this FSM -export([as_down/2, as_inactive/2, as_active/2, as_pending/2]). % exported API -export([create_asp/2]). % Timeouts in milliseconds -define(T_R_TIMEOUT, 2*60*100). -record(as_state, { as_sup_pid, role, t_r, asp_list }). create_asp(Name, AspFsmArgs) -> AsFsmName = sg_as_sup:get_as_fsm_name(Name), gen_fsm:sync_send_all_state_event(AsFsmName, {create_asp, AspFsmArgs}). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % gen_fsm callbacks %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% init([AsSupPid]) when is_pid(AsSupPid) -> AsState = #as_state{asp_list = [], as_sup_pid = AsSupPid, role = sg}, {ok, as_down, AsState}. terminate(Reason, State, _LoopDat) -> io:format("Terminating ~p in State ~p (Reason: ~p)~n", [?MODULE, State, Reason]), ok. code_change(_OldVsn, StateName, LoopDat, _Extra) -> {ok, StateName, LoopDat}. handle_sync_event({create_asp, Args}, From, State, LoopDat) -> % resolve the ASP supervisor PID AsSupPid = LoopDat#as_state.as_sup_pid, AsChildList = supervisor:which_children(AsSupPid), io:format("AsSupPid ~p, ChildList ~p~n", [AsSupPid, AsChildList]), {asp_sup, AspSupPid, _, _} = lists:keyfind(asp_sup, 1, AsChildList), % actually tell it to start a new ASP, prepend our own Pid Ret = supervisor:start_child(AspSupPid, [self()|Args]), LoopDatOut = case Ret of {ok, AspPid} -> link(AspPid), LoopDat#as_state{asp_list = [AspPid|LoopDat#as_state.asp_list]}; {ok, AspPid, _} -> link(AspPid), LoopDat#as_state{asp_list = [AspPid|LoopDat#as_state.asp_list]}; _ -> LoopDat end, {reply, Ret, State, LoopDatOut}. handle_event(Event, State, LoopDat) -> io:format("Unknown Event ~p in state ~p~n", [Event, State]), {next_state, State, LoopDat}. handle_info({'EXIT', Pid, Reason}, State, LoopDat) -> io:format("EXIT from Process ~p (~p), cleaning up ASP list~n", [Pid, Reason]), % FIXME: send fake ASP-DOWN event about ASP to self NewAspList = lists:delete(Pid, LoopDat#as_state.asp_list), {next_state, State, LoopDat#as_state{asp_list = NewAspList}}; handle_info(Info, State, LoopDat) -> io:format("Unknown Info ~p in state ~p~n", [Info, State]), {next_state, State, LoopDat}. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % STATE "as_down" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% as_down(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_INACTIVE', spec_name = indication, parameters = _Params}, LoopDat) -> % One ASP transitions into ASP-INACTIVE next_state(as_inactive, LoopDat); as_down(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_DOWN', spec_name = indication, parameters = _Params}, LoopDat) -> % ignore next_state(as_down, LoopDat). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % STATE "as_inactive" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% as_inactive(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_DOWN', spec_name = indication, parameters = AsPid}, LoopDat) -> % One ASP transitions into ASP-DOWN % FIXME: check if there are any other ASP != DOWN, if yes -> as_inactive case check_any_other_asp_not_down(LoopDat, AsPid) of true -> next_state(as_inactive, LoopDat); false -> next_state(as_down, LoopDat) end; as_inactive(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_ACTIVE', spec_name = indication, parameters = Params}, LoopDat) -> % One ASP transitions to ASP-ACTIVE next_state(as_active, LoopDat); as_inactive(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_INACTIVE', spec_name = indication, parameters = _Params}, LoopDat) -> % ignore next_state(as_inactive, LoopDat). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % STATE "as_active" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% as_active(#primitive{subsystem = 'ASPAS', gen_name = InactDown, spec_name = indication, parameters = AspPid}, LoopDat) when InactDown == 'ASP_DOWN'; InactDown == 'ASP_INACTIVE' -> % One ASP transitions to ASP-INACTIVE % check if there are other ASP in active, if yes -> as_active case check_any_other_asp_in_active(LoopDat, AspPid) of true -> next_state(as_active, LoopDat); false -> {ok, Tr} = timer:apply_after(?T_R_TIMEOUT, gen_fsm, send_event, [self(), {timer_expired, t_r}]), next_state(as_pending, LoopDat#as_state{t_r = Tr}) end; as_active(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_ACTIVE', spec_name = indication, parameters = _Params}, LoopDat) -> % ignore next_state(as_active, LoopDat). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % STATE "as_pending" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% as_pending(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_ACTIVE', spec_name = indication}, LoopDat) -> % One ASP transitions into ASP-ACTIVE timer:cancel(LoopDat#as_state.t_r), next_state(as_active, LoopDat); as_pending(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_INACTIVE', spec_name = indication, parameters = _Params}, LoopDat) -> % ignore next_state(as_pending, LoopDat); % FIXME: do we need to re-check as_pending state if we get ASP_DOWN of the last % inactive ASP ? as_pending(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_DOWN', spec_name = indication, parameters = _Params}, LoopDat) -> next_state(as_pending, LoopDat); as_pending({timer_expired, t_r}, LoopDat) -> % check if there is at least one ASP in ASP-INACTIVE -> AS-INACTIVE case check_any_other_asp_in_inactive(LoopDat, undefined) of true -> next_state(as_inactive, LoopDat); false -> next_state(as_down, LoopDat) end. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % helper functions %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% next_state(NewState, LoopDat) -> %FIXME Module:as_state_change(NewState, LoopDat#as_state.ext_state), {next_state, NewState, LoopDat}. %create_asp(LoopDatIn = #as_state{asp_module = {AspModule, AspModuleArgs}, % asp_list = AspListIn}) -> % Args = [AspModule, AspModuleArgs, UserFun, UserFunArgs, SctpPid], % {ok, AspPid} = gen_fsm:start_link(xua_asp_fsm, Args, [{debug, [trace]}]), % {AspPid, LoopDatIn#{asp_list = [AspPid|AspListIn]}}. check_any_other_asp_in_inactive(LoopDat, AspPid) -> check_any_other_asp_in_state('ASP_INACTIVE', LoopDat, AspPid). check_any_other_asp_in_active(LoopDat, AspPid) -> check_any_other_asp_in_state('ASP_ACTIVE', LoopDat, AspPid). check_any_other_asp_not_down(LoopDat, AspPid) -> ListWithoutMe = lists:delete(AspPid, LoopDat#as_state.asp_list), StateList = build_asp_state_list(ListWithoutMe), not lists:all(fun(E) -> E == 'ASP_DOWN' end, StateList). check_any_other_asp_in_state(State, LoopDat, AspPid) -> ListWithoutMe = lists:delete(AspPid, LoopDat#as_state.asp_list), StateList = build_asp_state_list(ListWithoutMe), lists:member(State, StateList). build_asp_state_list(ListOfPids) -> [xua_asp_fsm:get_state(X) || X <- ListOfPids].