%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2018. 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: The acceptor supervisor for ssh servers hangs under
%% ssh_system_sup.
%%----------------------------------------------------------------------
-module(ssh_acceptor_sup).
-behaviour(supervisor).
-include("ssh.hrl").
-export([start_link/4, start_child/5, stop_child/4]).
%% Supervisor callback
-export([init/1]).
-define(DEFAULT_TIMEOUT, 50000).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link(Address, Port, Profile, Options) ->
supervisor:start_link(?MODULE, [Address, Port, Profile, Options]).
start_child(AccSup, Address, Port, Profile, Options) ->
Spec = child_spec(Address, Port, Profile, Options),
case supervisor:start_child(AccSup, Spec) of
{error, already_present} ->
%% Is this ever called?
stop_child(AccSup, Address, Port, Profile),
supervisor:start_child(AccSup, Spec);
Reply ->
%% Reply = {ok,SystemSupPid} when the user calls ssh:daemon
%% after having called ssh:stop_listening
Reply
end.
stop_child(AccSup, Address, Port, Profile) ->
Name = id(Address, Port, Profile),
case supervisor:terminate_child(AccSup, Name) of
ok ->
supervisor:delete_child(AccSup, Name);
Error ->
Error
end.
%%%=========================================================================
%%% Supervisor callback
%%%=========================================================================
init([Address, Port, Profile, Options]) ->
%% Initial start of ssh_acceptor_sup for this port or new start after
%% ssh:stop_daemon
SupFlags = #{strategy => one_for_one,
intensity => 10,
period => 3600
},
ChildSpecs = [child_spec(Address, Port, Profile, Options)],
{ok, {SupFlags,ChildSpecs}}.
%%%=========================================================================
%%% Internal functions
%%%=========================================================================
child_spec(Address, Port, Profile, Options) ->
Timeout = ?GET_INTERNAL_OPT(timeout, Options, ?DEFAULT_TIMEOUT),
#{id => id(Address, Port, Profile),
start => {ssh_acceptor, start_link, [Port, Address, Options, Timeout]},
restart => transient % because a crashed listener could be replaced by a new one
}.
id(Address, Port, Profile) ->
{ssh_acceptor_sup, Address, Port, Profile}.
