Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 1 | % M2UA / M3UA / SUA AS gsn_fsm according to RFC3868 4.3.1 |
| 2 | |
| 3 | % (C) 2011-2012 by Harald Welte <laforge@gnumonks.org> |
| 4 | % |
| 5 | % All Rights Reserved |
| 6 | % |
| 7 | % This program is free software; you can redistribute it and/or modify |
| 8 | % it under the terms of the GNU Affero General Public License as |
| 9 | % published by the Free Software Foundation; either version 3 of the |
| 10 | % License, or (at your option) any later version. |
| 11 | % |
| 12 | % This program is distributed in the hope that it will be useful, |
| 13 | % but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | % GNU General Public License for more details. |
| 16 | % |
| 17 | % You should have received a copy of the GNU Affero General Public License |
| 18 | % along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | % |
| 20 | % Additional Permission under GNU AGPL version 3 section 7: |
| 21 | % |
| 22 | % If you modify this Program, or any covered work, by linking or |
| 23 | % combining it with runtime libraries of Erlang/OTP as released by |
| 24 | % Ericsson on http://www.erlang.org (or a modified version of these |
| 25 | % libraries), containing parts covered by the terms of the Erlang Public |
| 26 | % License (http://www.erlang.org/EPLICENSE), the licensors of this |
| 27 | % Program grant you additional permission to convey the resulting work |
| 28 | % without the need to license the runtime libraries of Erlang/OTP under |
| 29 | % the GNU Affero General Public License. Corresponding Source for a |
| 30 | % non-source form of such a combination shall include the source code |
| 31 | % for the parts of the runtime libraries of Erlang/OTP used as well as |
| 32 | % that of the covered work. |
| 33 | |
| 34 | -module(xua_as_fsm). |
| 35 | -author('Harald Welte <laforge@gnumonks.org>'). |
| 36 | -behaviour(gen_fsm). |
| 37 | |
| 38 | -include("osmo_util.hrl"). |
| 39 | -include("m3ua.hrl"). |
| 40 | |
| 41 | % gen_fsm exports |
Harald Welte | ee7964c | 2012-05-07 23:55:02 +0200 | [diff] [blame^] | 42 | -export([init/1, terminate/3, code_change/4, handle_event/3, handle_sync_event/4, handle_info/3]). |
Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 43 | |
| 44 | % states in this FSM |
| 45 | -export([as_down/2, as_inactive/2, as_active/2, as_pending/2]). |
| 46 | |
| 47 | % Timeouts in milliseconds |
| 48 | -define(T_R_TIMEOUT, 2*60*100). |
| 49 | |
| 50 | -record(as_state, { |
Harald Welte | ee7964c | 2012-05-07 23:55:02 +0200 | [diff] [blame^] | 51 | as_sup_pid, |
Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 52 | role, |
| 53 | t_r, |
| 54 | asp_list |
| 55 | }). |
| 56 | |
| 57 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 58 | % gen_fsm callbacks |
| 59 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 60 | |
Harald Welte | ee7964c | 2012-05-07 23:55:02 +0200 | [diff] [blame^] | 61 | init([AsSupPid]) when is_pid(AsSupPid) -> |
Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 62 | AsState = #as_state{asp_list = [], |
Harald Welte | ee7964c | 2012-05-07 23:55:02 +0200 | [diff] [blame^] | 63 | as_sup_pid = AsSupPid, |
Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 64 | role = sg}, |
| 65 | {ok, as_down, AsState}. |
| 66 | |
| 67 | terminate(Reason, State, _LoopDat) -> |
| 68 | io:format("Terminating ~p in State ~p (Reason: ~p)~n", |
| 69 | [?MODULE, State, Reason]), |
| 70 | ok. |
| 71 | |
| 72 | code_change(_OldVsn, StateName, LoopDat, _Extra) -> |
| 73 | {ok, StateName, LoopDat}. |
| 74 | |
Harald Welte | ee7964c | 2012-05-07 23:55:02 +0200 | [diff] [blame^] | 75 | handle_sync_event({create_asp, Args}, From, State, LoopDat) -> |
| 76 | % resolve the ASP supervisor PID |
| 77 | AsSupPid = LoopDat#as_state.as_sup_pid, |
| 78 | AsChildList = supervisor:which_children(AsSupPid), |
| 79 | io:format("AsSupPid ~p, ChildList ~p~n", [AsSupPid, AsChildList]), |
| 80 | {asp_sup, AspSupPid, _, _} = lists:keyfind(asp_sup, 1, AsChildList), |
| 81 | % actually tell it to start a new ASP, prepend our own Pid |
| 82 | Ret = supervisor:start_child(AspSupPid, [self()|Args]), |
| 83 | LoopDatOut = case Ret of |
| 84 | {ok, AspPid} -> |
| 85 | link(AspPid), |
| 86 | LoopDat#as_state{asp_list = [AspPid|LoopDat#as_state.asp_list]}; |
| 87 | {ok, AspPid, _} -> |
| 88 | link(AspPid), |
| 89 | LoopDat#as_state{asp_list = [AspPid|LoopDat#as_state.asp_list]}; |
| 90 | _ -> |
| 91 | LoopDat |
| 92 | end, |
| 93 | {reply, Ret, State, LoopDatOut}. |
| 94 | |
Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 95 | handle_event(Event, State, LoopDat) -> |
| 96 | io:format("Unknown Event ~p in state ~p~n", [Event, State]), |
| 97 | {next_state, State, LoopDat}. |
| 98 | |
| 99 | handle_info({'EXIT', Pid, Reason}, State, LoopDat) -> |
| 100 | io:format("EXIT from Process ~p (~p), cleaning up ASP list~n", |
| 101 | [Pid, Reason]), |
| 102 | % FIXME: send fake ASP-DOWN event about ASP to self |
Harald Welte | ee7964c | 2012-05-07 23:55:02 +0200 | [diff] [blame^] | 103 | NewAspList = lists:delete(Pid, LoopDat#as_state.asp_list), |
| 104 | {next_state, State, LoopDat#as_state{asp_list = NewAspList}}; |
Harald Welte | fbd4f73 | 2012-05-06 23:29:42 +0200 | [diff] [blame] | 105 | |
| 106 | handle_info(Info, State, LoopDat) -> |
| 107 | io:format("Unknown Info ~p in state ~p~n", [Info, State]), |
| 108 | {next_state, State, LoopDat}. |
| 109 | |
| 110 | |
| 111 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 112 | % STATE "as_down" |
| 113 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 114 | |
| 115 | as_down(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_INACTIVE', |
| 116 | spec_name = indication, parameters = _Params}, LoopDat) -> |
| 117 | % One ASP transitions into ASP-INACTIVE |
| 118 | next_state(as_inactive, LoopDat); |
| 119 | |
| 120 | as_down(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_DOWN', |
| 121 | spec_name = indication, parameters = _Params}, LoopDat) -> |
| 122 | % ignore |
| 123 | next_state(as_down, LoopDat). |
| 124 | |
| 125 | |
| 126 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 127 | % STATE "as_inactive" |
| 128 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 129 | |
| 130 | as_inactive(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_DOWN', |
| 131 | spec_name = indication, parameters = AsPid}, LoopDat) -> |
| 132 | % One ASP transitions into ASP-DOWN |
| 133 | % FIXME: check if there are any other ASP != DOWN, if yes -> as_inactive |
| 134 | case check_any_other_asp_not_down(LoopDat, AsPid) of |
| 135 | true -> |
| 136 | next_state(as_inactive, LoopDat); |
| 137 | false -> |
| 138 | next_state(as_down, LoopDat) |
| 139 | end; |
| 140 | |
| 141 | as_inactive(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_ACTIVE', |
| 142 | spec_name = indication, parameters = Params}, LoopDat) -> |
| 143 | % One ASP transitions to ASP-ACTIVE |
| 144 | next_state(as_active, LoopDat); |
| 145 | |
| 146 | as_inactive(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_INACTIVE', |
| 147 | spec_name = indication, parameters = _Params}, LoopDat) -> |
| 148 | % ignore |
| 149 | next_state(as_inactive, LoopDat). |
| 150 | |
| 151 | |
| 152 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 153 | % STATE "as_active" |
| 154 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 155 | |
| 156 | as_active(#primitive{subsystem = 'ASPAS', gen_name = InactDown, |
| 157 | spec_name = indication, parameters = AspPid}, LoopDat) when |
| 158 | InactDown == 'ASP_DOWN'; InactDown == 'ASP_INACTIVE' -> |
| 159 | % One ASP transitions to ASP-INACTIVE |
| 160 | % check if there are other ASP in active, if yes -> as_active |
| 161 | case check_any_other_asp_in_active(LoopDat, AspPid) of |
| 162 | true -> |
| 163 | next_state(as_active, LoopDat); |
| 164 | false -> |
| 165 | {ok, Tr} = timer:apply_after(?T_R_TIMEOUT, gen_fsm, send_event, |
| 166 | [self(), {timer_expired, t_r}]), |
| 167 | next_state(as_pending, LoopDat#as_state{t_r = Tr}) |
| 168 | end; |
| 169 | |
| 170 | as_active(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_ACTIVE', |
| 171 | spec_name = indication, parameters = _Params}, LoopDat) -> |
| 172 | % ignore |
| 173 | next_state(as_active, LoopDat). |
| 174 | |
| 175 | |
| 176 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 177 | % STATE "as_pending" |
| 178 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 179 | |
| 180 | as_pending(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_ACTIVE', |
| 181 | spec_name = indication}, LoopDat) -> |
| 182 | % One ASP transitions into ASP-ACTIVE |
| 183 | timer:cancel(LoopDat#as_state.t_r), |
| 184 | next_state(as_active, LoopDat); |
| 185 | |
| 186 | as_pending(#primitive{subsystem = 'ASPAS', gen_name = 'ASP_INACTIVE', |
| 187 | spec_name = indication, parameters = _Params}, LoopDat) -> |
| 188 | % ignore |
| 189 | next_state(as_pending, LoopDat); |
| 190 | |
| 191 | % FIXME: do we need to re-check as_pending state if we get ASP_DOWN of the last |
| 192 | % inactive ASP ? |
| 193 | |
| 194 | as_pending({timer_expired, t_r}, LoopDat) -> |
| 195 | % check if there is at least one ASP in ASP-INACTIVE -> AS-INACTIVE |
| 196 | case check_any_other_asp_in_inactive(LoopDat, undefined) of |
| 197 | true -> |
| 198 | next_state(as_inactive, LoopDat); |
| 199 | false -> |
| 200 | next_state(as_down, LoopDat) |
| 201 | end. |
| 202 | |
| 203 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 204 | % helper functions |
| 205 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 206 | |
| 207 | next_state(NewState, LoopDat) -> |
| 208 | %FIXME Module:as_state_change(NewState, LoopDat#as_state.ext_state), |
| 209 | {next_state, NewState, LoopDat}. |
| 210 | |
| 211 | %create_asp(LoopDatIn = #as_state{asp_module = {AspModule, AspModuleArgs}, |
| 212 | % asp_list = AspListIn}) -> |
| 213 | % Args = [AspModule, AspModuleArgs, UserFun, UserFunArgs, SctpPid], |
| 214 | % {ok, AspPid} = gen_fsm:start_link(xua_asp_fsm, Args, [{debug, [trace]}]), |
| 215 | % {AspPid, LoopDatIn#{asp_list = [AspPid|AspListIn]}}. |
| 216 | |
| 217 | |
| 218 | |
| 219 | check_any_other_asp_in_inactive(LoopDat, AspPid) -> |
| 220 | check_any_other_asp_in_state('ASP_INACTIVE', LoopDat, AspPid). |
| 221 | |
| 222 | check_any_other_asp_in_active(LoopDat, AspPid) -> |
| 223 | check_any_other_asp_in_state('ASP_ACTIVE', LoopDat, AspPid). |
| 224 | |
| 225 | check_any_other_asp_not_down(LoopDat, AspPid) -> |
| 226 | ListWithoutMe = lists:delete(AspPid, LoopDat#as_state.asp_list), |
| 227 | StateList = build_asp_state_list(ListWithoutMe), |
| 228 | not lists:all('ASP_DOWN', StateList). |
| 229 | |
| 230 | check_any_other_asp_in_state(State, LoopDat, AspPid) -> |
| 231 | ListWithoutMe = lists:delete(AspPid, LoopDat#as_state.asp_list), |
| 232 | StateList = build_asp_state_list(ListWithoutMe), |
| 233 | lists:member(State, StateList). |
| 234 | |
| 235 | build_asp_state_list(ListOfPids) -> |
| 236 | % FIXME |
| 237 | []. |