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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2016-2020. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% Purpose: Supervisor for a procsses dispatching upd datagrams to
%% correct DTLS handler
%%----------------------------------------------------------------------
-module(dtls_listener_sup).
-behaviour(supervisor).
%% API
-export([start_link/0]).
-export([start_child/1,
lookup_listener/2,
register_listener/3]).
%% Supervisor callback
-export([init/1]).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
start_child(Args) ->
supervisor:start_child(?MODULE, Args).
lookup_listener(IP, Port) ->
try ets:lookup(dtls_listener_sup, {IP, Port}) of
[] ->
undefined;
[{{IP, Port}, {Owner, Handler}}] ->
case erlang:is_process_alive(Handler) of
true ->
case (Owner =/= undefined) andalso
erlang:is_process_alive(Owner) of
true ->
%% Trying to bind port that is already bound
{error, already_listening};
false ->
%% Re-open same listen socket when the handler
%% is dead.
{ok, Handler}
end;
false ->
ets:delete(dtls_listener_sup, {IP, Port}),
undefined
end
catch _:_ ->
undefined
end.
register_listener(OwnerAndListner, IP, Port) ->
ets:insert(dtls_listener_sup, {{IP, Port}, OwnerAndListner}).
%%%=========================================================================
%%% Supervisor callback
%%%=========================================================================
init(_O) ->
ets:new(dtls_listener_sup, [named_table, public, set]),
RestartStrategy = simple_one_for_one,
MaxR = 0,
MaxT = 3600,
Name = undefined, % As simple_one_for_one is used.
StartFunc = {dtls_packet_demux, start_link, []},
Restart = temporary, % E.g. should not be restarted
Shutdown = 4000,
Modules = [dtls_packet_demux],
Type = worker,
ChildSpec = {Name, StartFunc, Restart, Shutdown, Type, Modules},
{ok, {{RestartStrategy, MaxR, MaxT}, [ChildSpec]}}.
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