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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2020. 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%
%%
-module(erl_distribution).
-behaviour(supervisor).
-include_lib("kernel/include/logger.hrl").
-export([start_link/0,start_link/3,init/1,start/1,stop/0]).
-define(DBG,erlang:display([?MODULE,?LINE])).
%% Called during system start-up.
start_link() ->
do_start_link([{sname,shortnames},{name,longnames}]).
%% Called from net_kernel:start/1 to start distribution after the
%% system has already started.
start(Args) ->
C = #{id => net_sup_dynamic,
start => {?MODULE,start_link,[Args,false,net_sup_dynamic]},
restart => permanent,
shutdown => 1000,
type => supervisor,
modules => [erl_distribution]},
supervisor:start_child(kernel_sup, C).
%% Stop distribution.
stop() ->
case supervisor:terminate_child(kernel_sup, net_sup_dynamic) of
ok ->
supervisor:delete_child(kernel_sup, net_sup_dynamic);
Error ->
case whereis(net_sup) of
Pid when is_pid(Pid) ->
%% Dist. started through -sname | -name flags
{error, not_allowed};
_ ->
Error
end
end.
%%%
%%% Internal helper functions.
%%%
%% Helper start function.
start_link(Args, CleanHalt, NetSup) ->
supervisor:start_link({local,net_sup}, ?MODULE, [Args,CleanHalt,NetSup]).
init(NetArgs) ->
Epmd =
case init:get_argument(no_epmd) of
{ok, [[]]} ->
[];
_ ->
EpmdMod = net_kernel:epmd_module(),
[#{id => EpmdMod,
start => {EpmdMod,start_link,[]},
restart => permanent,
shutdown => 2000,
type => worker,
modules => [EpmdMod]}]
end,
Auth = #{id => auth,
start => {auth,start_link,[]},
restart => permanent,
shutdown => 2000,
type => worker,
modules => [auth]},
Kernel = #{id => net_kernel,
start => {net_kernel,start_link,NetArgs},
restart => permanent,
shutdown => 2000,
type => worker,
modules => [net_kernel]},
EarlySpecs = net_kernel:protocol_childspecs(),
SupFlags = #{strategy => one_for_all,
intensity => 0,
period => 1},
{ok, {SupFlags, EarlySpecs ++ Epmd ++ [Auth,Kernel]}}.
do_start_link([{Arg,Flag}|T]) ->
case init:get_argument(Arg) of
{ok,[[Name]]} ->
start_link([list_to_atom(Name),Flag|ticktime()], true, net_sup);
{ok,[[Name]|_Rest]} ->
?LOG_WARNING("Multiple -~p given to erl, using the first, ~p",
[Arg, Name]),
start_link([list_to_atom(Name),Flag|ticktime()], true, net_sup);
{ok,[Invalid|_]} ->
?LOG_ERROR("Invalid -~p given to erl, ~ts",
[Arg, lists:join(" ",Invalid)]),
do_start_link(T);
_ ->
do_start_link(T)
end;
do_start_link([]) ->
ignore.
ticktime() ->
%% catch, in case the system was started with boot file start_old,
%% i.e. running without the application_controller.
%% Time is given in seconds. The net_kernel tick time is
%% Time/4 milliseconds.
case catch application:get_env(net_ticktime) of
{ok, Value} when is_integer(Value), Value > 0 ->
[Value * 250]; %% i.e. 1000 / 4 = 250 ms.
_ ->
[]
end.
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