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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_shovel_dyn_worker_sup_sup).
-behaviour(mirrored_supervisor).
-export([start_link/0, init/1, adjust/2, stop_child/1]).
-import(rabbit_misc, [pget/2]).
-include("rabbit_shovel.hrl").
-include_lib("rabbit_common/include/rabbit.hrl").
-define(SUPERVISOR, ?MODULE).
start_link() ->
Pid = case mirrored_supervisor:start_link(
{local, ?SUPERVISOR}, ?SUPERVISOR,
fun rabbit_misc:execute_mnesia_transaction/1, ?MODULE, []) of
{ok, Pid0} -> Pid0;
{error, {already_started, Pid0}} -> Pid0
end,
Shovels = rabbit_runtime_parameters:list_component(<<"shovel">>),
[start_child({pget(vhost, Shovel), pget(name, Shovel)},
pget(value, Shovel)) || Shovel <- Shovels],
{ok, Pid}.
adjust(Name, Def) ->
case child_exists(Name) of
true -> stop_child(Name);
false -> ok
end,
start_child(Name, Def).
start_child(Name, Def) ->
case mirrored_supervisor:start_child(
?SUPERVISOR,
{Name, {rabbit_shovel_dyn_worker_sup, start_link, [Name, Def]},
transient, ?WORKER_WAIT, worker, [rabbit_shovel_dyn_worker_sup]}) of
{ok, _Pid} -> ok;
{error, {already_started, _Pid}} -> ok
end.
child_exists(Name) ->
lists:any(fun ({N, _, _, _}) -> N =:= Name end,
mirrored_supervisor:which_children(?SUPERVISOR)).
stop_child(Name) ->
case get(shovel_worker_autodelete) of
true -> ok; %% [1]
_ ->
ok = mirrored_supervisor:terminate_child(?SUPERVISOR, Name),
ok = mirrored_supervisor:delete_child(?SUPERVISOR, Name),
rabbit_shovel_status:remove(Name)
end.
%% [1] An autodeleting worker removes its own parameter, and thus ends
%% up here via the parameter callback. It is a transient worker that
%% is just about to terminate normally - so we don't need to tell the
%% supervisor to stop us - and as usual if we call into our own
%% supervisor we risk deadlock.
%%
%% See rabbit_shovel_worker:maybe_autodelete/1
%%----------------------------------------------------------------------------
init([]) ->
{ok, {{one_for_one, 3, 10}, []}}.
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