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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2013. 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 top supervisor for ssh servers hangs under
%% ssh_sup.
%%----------------------------------------------------------------------
-module(sshd_sup).
-behaviour(supervisor).
-export([start_link/1, start_child/1, stop_child/1,
stop_child/2, system_name/1]).
%% Supervisor callback
-export([init/1]).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link(Servers) ->
supervisor:start_link({local, ?MODULE}, ?MODULE, [Servers]).
start_child(ServerOpts) ->
Address = proplists:get_value(address, ServerOpts),
Port = proplists:get_value(port, ServerOpts),
case ssh_system_sup:system_supervisor(Address, Port) of
undefined ->
Spec = child_spec(Address, Port, ServerOpts),
case supervisor:start_child(?MODULE, Spec) of
{error, already_present} ->
Name = id(Address, Port),
supervisor:delete_child(?MODULE, Name),
supervisor:start_child(?MODULE, Spec);
Reply ->
Reply
end;
Pid ->
AccPid = ssh_system_sup:acceptor_supervisor(Pid),
ssh_acceptor_sup:start_child(AccPid, ServerOpts)
end.
stop_child(Name) ->
supervisor:terminate_child(?MODULE, Name).
stop_child(Address, Port) ->
Name = id(Address, Port),
stop_child(Name).
system_name(SysSup) ->
Children = supervisor:which_children(sshd_sup),
system_name(SysSup, Children).
%%%=========================================================================
%%% Supervisor callback
%%%=========================================================================
init([Servers]) ->
RestartStrategy = one_for_one,
MaxR = 10,
MaxT = 3600,
Fun = fun(ServerOpts) ->
Address = proplists:get_value(address, ServerOpts),
Port = proplists:get_value(port, ServerOpts),
child_spec(Address, Port, ServerOpts)
end,
Children = lists:map(Fun, Servers),
{ok, {{RestartStrategy, MaxR, MaxT}, Children}}.
%%%=========================================================================
%%% Internal functions
%%%=========================================================================
child_spec(Address, Port, ServerOpts) ->
Name = id(Address, Port),
StartFunc = {ssh_system_sup, start_link, [ServerOpts]},
Restart = temporary,
Shutdown = infinity,
Modules = [ssh_system_sup],
Type = supervisor,
{Name, StartFunc, Restart, Shutdown, Type, Modules}.
id(Address, Port) ->
{server, ssh_system_sup, Address, Port}.
system_name([], _ ) ->
undefined;
system_name(SysSup, [{Name, SysSup, _, _} | _]) ->
Name;
system_name(SysSup, [_ | Rest]) ->
system_name(SysSup, Rest).
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