102 lines
3.8 KiB
Erlang
102 lines
3.8 KiB
Erlang
% simple, blocking/synchronous GSUP client
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% (C) 2019 by Harald Welte <laforge@gnumonks.org>
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%
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% All Rights Reserved
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%
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% This program is free software; you can redistribute it and/or modify
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% it under the terms of the GNU Affero General Public License as
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% published by the Free Software Foundation; either version 3 of the
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% License, or (at your option) any later version.
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%
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% This program is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU Affero General Public License
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% along with this program. If not, see <http://www.gnu.org/licenses/>.
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%
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% Additional Permission under GNU AGPL version 3 section 7:
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%
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% If you modify this Program, or any covered work, by linking or
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% combining it with runtime libraries of Erlang/OTP as released by
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% Ericsson on http://www.erlang.org (or a modified version of these
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% libraries), containing parts covered by the terms of the Erlang Public
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% License (http://www.erlang.org/EPLICENSE), the licensors of this
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% Program grant you additional permission to convey the resulting work
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% without the need to license the runtime libraries of Erlang/OTP under
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% the GNU Affero General Public License. Corresponding Source for a
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% non-source form of such a combination shall include the source code
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% for the parts of the runtime libraries of Erlang/OTP used as well as
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% that of the covered work.
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-module(gsup_client).
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-behaviour(gen_server).
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-include_lib("osmo_gsup/include/gsup_protocol.hrl").
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-define(IPAC_PROTO_EXT_GSUP, {osmo, 5}).
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-record(gsupc_state, {
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socket,
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ipa_pid
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}).
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-export([start_link/3]).
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2]).
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-export([code_change/3, terminate/2]).
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%% ------------------------------------------------------------------
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%% our exported API
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%% ------------------------------------------------------------------
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start_link(ServerAddr, ServerPort, Options) ->
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gen_server:start_link(?MODULE, [ServerAddr, ServerPort, Options], [{debug, [trace]}]).
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%% ------------------------------------------------------------------
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%% gen_server Function Definitions
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%% ------------------------------------------------------------------
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init([Address, Port, Options]) ->
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ipa_proto:init(),
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% register the GSUP codec with the IPA core; ignore result as we mgiht be doing this multiple times
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ipa_proto:register_codec(?IPAC_PROTO_EXT_GSUP, fun gsup_protocol:encode/1, fun gsup_protocol:decode/1),
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{ok, {Socket, IpaPid}} = ipa_proto:connect(Address, Port, Options),
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true = ipa_proto:register_stream(Socket, ?IPAC_PROTO_EXT_GSUP, {process_id, self()}),
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ipa_proto:unblock(Socket),
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{ok, #gsupc_state{socket=Socket, ipa_pid=IpaPid}}.
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% send a given GSUP message and synchronously wait for message type ExpRes or ExpErr
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handle_call({transceive_gsup, GsupMsgTx, ExpRes, ExpErr}, _From, State) ->
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Socket = State#gsupc_state.socket,
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{ok, Imsi} = maps:find(imsi, GsupMsgTx),
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ipa_proto:send(Socket, ?IPAC_PROTO_EXT_GSUP, GsupMsgTx),
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% selective receive for only those GSUP responses we expect
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receive
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{ipa, Socket, ?IPAC_PROTO_EXT_GSUP, GsupMsgRx = #{message_type := ExpRes, imsi := Imsi}} ->
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{reply, GsupMsgRx, State};
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{ipa, Socket, ?IPAC_PROTO_EXT_GSUP, GsupMsgRx = #{message_type := ExpErr, imsi := Imsi}} ->
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{reply, GsupMsgRx, State}
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after 5000 ->
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{reply, timeout, State}
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end.
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handle_cast(Info, S) ->
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error_logger:error_report(["unknown handle_cast", {module, ?MODULE}, {info, Info}, {state, S}]),
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{noreply, S}.
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handle_info(Info, S) ->
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error_logger:error_report(["unknown handle_info", {module, ?MODULE}, {info, Info}, {state, S}]),
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{noreply, S}.
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terminate(Reason, _S) ->
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lager:info("terminating ~p with reason ~p~n", [?MODULE, Reason]).
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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