%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2016. 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/1, start_child/2, stop_child/4]).
%% Supervisor callback
-export([init/1]).
-define(DEFAULT_TIMEOUT, 50000).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link(Servers) ->
supervisor:start_link(?MODULE, [Servers]).
start_child(AccSup, ServerOpts) ->
Spec = child_spec(ServerOpts),
case supervisor:start_child(AccSup, Spec) of
{error, already_present} ->
Address = proplists:get_value(address, ServerOpts),
Port = proplists:get_value(port, ServerOpts),
Profile = proplists:get_value(profile,
proplists:get_value(ssh_opts, ServerOpts), ?DEFAULT_PROFILE),
stop_child(AccSup, Address, Port, Profile),
supervisor:start_child(AccSup, Spec);
Reply ->
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([ServerOpts]) ->
RestartStrategy = one_for_one,
MaxR = 10,
MaxT = 3600,
Children = [child_spec(ServerOpts)],
{ok, {{RestartStrategy, MaxR, MaxT}, Children}}.
%%%=========================================================================
%%% Internal functions
%%%=========================================================================
child_spec(ServerOpts) ->
Address = proplists:get_value(address, ServerOpts),
Port = proplists:get_value(port, ServerOpts),
Timeout = proplists:get_value(timeout, ServerOpts, ?DEFAULT_TIMEOUT),
Profile = proplists:get_value(profile, proplists:get_value(ssh_opts, ServerOpts), ?DEFAULT_PROFILE),
Name = id(Address, Port, Profile),
SocketOpts = proplists:get_value(socket_opts, ServerOpts),
StartFunc = {ssh_acceptor, start_link, [Port, Address,
[{active, false},
{reuseaddr, true}] ++ SocketOpts,
ServerOpts, Timeout]},
Restart = transient,
Shutdown = brutal_kill,
Modules = [ssh_acceptor],
Type = worker,
{Name, StartFunc, Restart, Shutdown, Type, Modules}.
id(Address, Port, Profile) ->
case is_list(Address) of
true ->
{ssh_acceptor_sup, any, Port, Profile};
false ->
{ssh_acceptor_sup, Address, Port, Profile}
end.
