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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/ssh/src/sshd_sup.erl
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The R13B03 release.OTP_R13B03
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2008-2009. 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) ->
+ case supervisor:terminate_child(?MODULE, Name) of
+ ok ->
+ supervisor:delete_child(?MODULE, Name);
+ Error ->
+ Error
+ end.
+
+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 = transient,
+ 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).