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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2020-2020. 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 listen options tracker
%%----------------------------------------------------------------------
-module(ssl_upgrade_server_session_cache_sup).
-behaviour(supervisor).
-include("ssl_internal.hrl").
%% API
-export([start_link/0,
start_link_dist/0]).
-export([start_child/1]).
%% Supervisor callback
-export([init/1]).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link() ->
supervisor:start_link({local, sup_name(normal)}, ?MODULE, []).
start_link_dist() ->
supervisor:start_link({local, sup_name(dist)}, ?MODULE, []).
start_child(Type) ->
SupName = sup_name(Type),
Children = supervisor:count_children(SupName),
Workers = proplists:get_value(workers, Children),
case Workers of
0 ->
%% In case two upgrade servers are started very close to each other
%% only one will be able to grab the local name and we will use
%% that process for handling pre TLS-1.3 sessions for
%% servers with to us unknown listeners.
case supervisor:start_child(SupName, [ssl_unknown_listener | ssl_config:pre_1_3_session_opts()]) of
{error, {already_started, Child}} ->
{ok, Child};
{ok, _} = Return ->
Return
end;
1 ->
[{_,Child,_, _}] = supervisor:which_children(SupName),
{ok, Child}
end.
%%%=========================================================================
%%% Supervisor callback
%%%=========================================================================
init(_O) ->
RestartStrategy = simple_one_for_one,
MaxR = 3,
MaxT = 3600,
Name = undefined, % As simple_one_for_one is used.
StartFunc = {ssl_server_session_cache, start_link, []},
Restart = transient, % Should be restarted only on abnormal termination
Shutdown = 4000,
Modules = [ssl_server_session_cache],
Type = worker,
ChildSpec = {Name, StartFunc, Restart, Shutdown, Type, Modules},
{ok, {{RestartStrategy, MaxR, MaxT}, [ChildSpec]}}.
sup_name(normal) ->
?MODULE;
sup_name(dist) ->
list_to_atom(atom_to_list(?MODULE) ++ "_dist").
|
