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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/ssh_system_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 ssh server instance supervisor, an instans of this supervisor
+%% exists for every ip-address and port combination, hangs under
+%% sshd_sup.
+%%----------------------------------------------------------------------
+
+-module(ssh_system_sup).
+
+-behaviour(supervisor).
+
+-export([start_link/1, stop_listener/1,
+ stop_listener/2, stop_system/1,
+ stop_system/2, system_supervisor/2,
+ subsystem_supervisor/1, channel_supervisor/1,
+ connection_supervisor/1,
+ acceptor_supervisor/1, start_subsystem/2, restart_subsystem/2, restart_acceptor/2]).
+
+%% Supervisor callback
+-export([init/1]).
+
+%%%=========================================================================
+%%% API
+%%%=========================================================================
+start_link(ServerOpts) ->
+ Address = proplists:get_value(address, ServerOpts),
+ Port = proplists:get_value(port, ServerOpts),
+ Name = make_name(Address, Port),
+ supervisor:start_link({local, Name}, ?MODULE, [ServerOpts]).
+
+stop_listener(SysSup) ->
+ stop_acceptor(SysSup).
+
+stop_listener(Address, Port) ->
+ Name = make_name(Address, Port),
+ stop_acceptor(whereis(Name)).
+
+stop_system(SysSup) ->
+ Name = sshd_sup:system_name(SysSup),
+ sshd_sup:stop_child(Name).
+
+stop_system(Address, Port) ->
+ sshd_sup:stop_child(Address, Port).
+
+system_supervisor(Address, Port) ->
+ Name = make_name(Address, Port),
+ whereis(Name).
+
+subsystem_supervisor(SystemSup) ->
+ ssh_subsystem_sup(supervisor:which_children(SystemSup)).
+
+channel_supervisor(SystemSup) ->
+ SubSysSup = ssh_subsystem_sup(supervisor:which_children(SystemSup)),
+ ssh_subsystem_sup:channel_supervisor(SubSysSup).
+
+connection_supervisor(SystemSup) ->
+ SubSysSup = ssh_subsystem_sup(supervisor:which_children(SystemSup)),
+ ssh_subsystem_sup:connection_supervisor(SubSysSup).
+
+acceptor_supervisor(SystemSup) ->
+ ssh_acceptor_sup(supervisor:which_children(SystemSup)).
+
+start_subsystem(SystemSup, Options) ->
+ Spec = ssh_subsystem_child_spec(Options),
+ supervisor:start_child(SystemSup, Spec).
+
+restart_subsystem(Address, Port) ->
+ SysSupName = make_name(Address, Port),
+ SubSysName = id(ssh_subsystem_sup, Address, Port),
+ case supervisor:terminate_child(SysSupName, SubSysName) of
+ ok ->
+ supervisor:restart_child(SysSupName, SubSysName);
+ Error ->
+ Error
+ end.
+
+restart_acceptor(Address, Port) ->
+ SysSupName = make_name(Address, Port),
+ AcceptorName = id(ssh_acceptor_sup, Address, Port),
+ supervisor:restart_child(SysSupName, AcceptorName).
+
+%%%=========================================================================
+%%% Supervisor callback
+%%%=========================================================================
+init([ServerOpts]) ->
+ RestartStrategy = one_for_one,
+ MaxR = 10,
+ MaxT = 3600,
+ Children = child_specs(ServerOpts),
+ {ok, {{RestartStrategy, MaxR, MaxT}, Children}}.
+
+%%%=========================================================================
+%%% Internal functions
+%%%=========================================================================
+child_specs(ServerOpts) ->
+ [ssh_acceptor_child_spec(ServerOpts)].
+
+ssh_acceptor_child_spec(ServerOpts) ->
+ Address = proplists:get_value(address, ServerOpts),
+ Port = proplists:get_value(port, ServerOpts),
+ Name = id(ssh_acceptor_sup, Address, Port),
+ StartFunc = {ssh_acceptor_sup, start_link, [ServerOpts]},
+ Restart = permanent,
+ Shutdown = infinity,
+ Modules = [ssh_acceptor_sup],
+ Type = supervisor,
+ {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+
+ssh_subsystem_child_spec(ServerOpts) ->
+ Name = make_ref(),
+ StartFunc = {ssh_subsystem_sup, start_link, [ServerOpts]},
+ Restart = temporary,
+ Shutdown = infinity,
+ Modules = [ssh_subsystem_sup],
+ Type = supervisor,
+ {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+
+
+id(Sup, Address, Port) ->
+ {Sup, Address, Port}.
+
+make_name(Address, Port) ->
+ list_to_atom(lists:flatten(io_lib:format("ssh_system_~p_~p_sup",
+ [Address, Port]))).
+
+ssh_subsystem_sup([{_, Child, _, [ssh_subsystem_sup]} | _]) ->
+ Child;
+ssh_subsystem_sup([_ | Rest]) ->
+ ssh_subsystem_sup(Rest).
+
+ssh_acceptor_sup([{_, Child, _, [ssh_acceptor_sup]} | _]) ->
+ Child;
+ssh_acceptor_sup([_ | Rest]) ->
+ ssh_acceptor_sup(Rest).
+
+stop_acceptor(Sup) ->
+ [Name] =
+ [SupName || {SupName, _, _, [ssh_acceptor_sup]} <-
+ supervisor:which_children(Sup)],
+ supervisor:terminate_child(Sup, Name).
+