110 lines
3.5 KiB
Erlang
110 lines
3.5 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% Author : Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%% Created : 6 Apr 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2021 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%-------------------------------------------------------------------
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-module(ejabberd_redis_sup).
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-behaviour(supervisor).
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%% API
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-export([start/0, stop/0, start_link/0]).
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-export([get_pool_size/0, config_reloaded/0]).
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%% Supervisor callbacks
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-export([init/1]).
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-include("logger.hrl").
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%%%===================================================================
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%%% API functions
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%%%===================================================================
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start() ->
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case is_started() of
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true -> ok;
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false ->
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ejabberd:start_app(eredis),
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Spec = {?MODULE, {?MODULE, start_link, []},
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permanent, infinity, supervisor, [?MODULE]},
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case supervisor:start_child(ejabberd_db_sup, Spec) of
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{ok, _} -> ok;
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{error, {already_started, Pid}} ->
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%% Wait for the supervisor to fully start
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_ = supervisor:count_children(Pid),
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ok;
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{error, Why} = Err ->
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?ERROR_MSG("Failed to start ~ts: ~p", [?MODULE, Why]),
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Err
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end
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end.
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stop() ->
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ejabberd_hooks:delete(config_reloaded, ?MODULE, config_reloaded, 20),
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_ = supervisor:terminate_child(ejabberd_db_sup, ?MODULE),
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_ = supervisor:delete_child(ejabberd_db_sup, ?MODULE),
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ok.
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start_link() ->
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supervisor:start_link({local, ?MODULE}, ?MODULE, []).
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config_reloaded() ->
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case is_started() of
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true ->
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lists:foreach(
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fun(Spec) ->
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supervisor:start_child(?MODULE, Spec)
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end, get_specs()),
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PoolSize = get_pool_size(),
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lists:foreach(
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fun({Id, _, _, _}) when Id > PoolSize ->
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case supervisor:terminate_child(?MODULE, Id) of
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ok -> supervisor:delete_child(?MODULE, Id);
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_ -> ok
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end;
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(_) ->
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ok
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end, supervisor:which_children(?MODULE));
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false ->
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ok
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end.
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%%%===================================================================
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%%% Supervisor callbacks
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%%%===================================================================
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init([]) ->
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ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 20),
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{ok, {{one_for_one, 500, 1}, get_specs()}}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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get_specs() ->
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lists:map(
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fun(I) ->
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{I, {ejabberd_redis, start_link, [I]},
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transient, 2000, worker, [?MODULE]}
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end, lists:seq(1, get_pool_size())).
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get_pool_size() ->
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ejabberd_option:redis_pool_size() + 1.
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is_started() ->
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whereis(?MODULE) /= undefined.
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