%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% Purpose: The acceptor supervisor for ssh servers hangs under
%% ssh_system_sup.
%%----------------------------------------------------------------------
-module(ssh_acceptor_sup).
-behaviour(supervisor).
-export([start_link/1, start_child/2, stop_child/2]).
%% 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),
Name = id(Address, Port),
supervisor:delete_child(?MODULE, Name),
supervisor:start_child(AccSup, Spec);
Reply ->
Reply
end.
stop_child(Address, Port) ->
Name = id(Address, Port),
case supervisor:terminate_child(?MODULE, Name) of
ok ->
supervisor:delete_child(?MODULE, 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),
Name = id(Address, Port),
SocketOpts = proplists:get_value(socket_opts, ServerOpts),
StartFunc = {ssh_acceptor, start_link, [Port, Address,
[{active, false},
{reuseaddr, true}] ++ SocketOpts,
ServerOpts, Timeout]},
Restart = permanent,
Shutdown = 3600,
Modules = [ssh_acceptor],
Type = worker,
{Name, StartFunc, Restart, Shutdown, Type, Modules}.
id(Address, Port) ->
{ssh_acceptor_sup, Address, Port}.
