add missing gsup_client.erl

Harald Welte 2019-08-14 13:30:49 +02:00
parent 44da7d743f
commit 51f47c0f56
1 changed files with 101 additions and 0 deletions

src/gsup_client.erl Normal file
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% simple, blocking/synchronous GSUP client
% (C) 2019 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
% 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 (or a modified version of these
% libraries), containing parts covered by the terms of the Erlang Public
% License (, 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.
-define(IPAC_PROTO_EXT_GSUP, {osmo, 5}).
-record(gsupc_state, {
-export([init/1, handle_call/3, handle_cast/2, handle_info/2]).
-export([code_change/3, terminate/2]).
%% ------------------------------------------------------------------
%% our exported API
%% ------------------------------------------------------------------
start_link(ServerAddr, ServerPort, Options) ->
gen_server:start_link(?MODULE, [ServerAddr, ServerPort, Options], [{debug, [trace]}]).
%% ------------------------------------------------------------------
%% gen_server Function Definitions
%% ------------------------------------------------------------------
init([Address, Port, Options]) ->
% register the GSUP codec with the IPA core; ignore result as we mgiht be doing this multiple times
ipa_proto:register_codec(?IPAC_PROTO_EXT_GSUP, fun gsup_protocol:encode/1, fun gsup_protocol:decode/1),
{ok, {Socket, IpaPid}} = ipa_proto:connect(Address, Port, Options),
true = ipa_proto:register_stream(Socket, ?IPAC_PROTO_EXT_GSUP, {process_id, self()}),
{ok, #gsupc_state{socket=Socket, ipa_pid=IpaPid}}.
% send a given GSUP message and synchronously wait for message type ExpRes or ExpErr
handle_call({transceive_gsup, GsupMsgTx, ExpRes, ExpErr}, _From, State) ->
Socket = State#gsupc_state.socket,
{ok, Imsi} = maps:find(imsi, GsupMsgTx),
ipa_proto:send(Socket, ?IPAC_PROTO_EXT_GSUP, GsupMsgTx),
% selective receive for only those GSUP responses we expect
{ipa, Socket, ?IPAC_PROTO_EXT_GSUP, GsupMsgRx = #{message_type := ExpRes, imsi := Imsi}} ->
{reply, GsupMsgRx, State};
{ipa, Socket, ?IPAC_PROTO_EXT_GSUP, GsupMsgRx = #{message_type := ExpErr, imsi := Imsi}} ->
{reply, GsupMsgRx, State}
after 5000 ->
{reply, timeout, State}
handle_cast(Info, S) ->
error_logger:error_report(["unknown handle_cast", {module, ?MODULE}, {info, Info}, {state, S}]),
{noreply, S}.
handle_info(Info, S) ->
error_logger:error_report(["unknown handle_info", {module, ?MODULE}, {info, Info}, {state, S}]),
{noreply, S}.
terminate(Reason, _S) ->
lager:info("terminating ~p with reason ~p~n", [?MODULE, Reason]).
code_change(_OldVsn, State, _Extra) ->
{ok, State}.