143 lines
4.0 KiB
Erlang
143 lines
4.0 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_riak_sup.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Riak connections supervisor
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%%% Created : 29 Dec 2011 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2019 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_riak_sup).
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-behaviour(supervisor).
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-author('alexey@process-one.net').
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-export([start/0, start_link/0, init/1, get_pids/0,
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get_random_pid/0, config_reloaded/0]).
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-include("logger.hrl").
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% time to wait for the supervisor to start its child before returning
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% a timeout error to the request
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-define(CONNECT_TIMEOUT, 500). % milliseconds
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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(riakc),
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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, _}} -> ok;
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{error, Why} = Err ->
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?ERROR_MSG("Failed to start ~s: ~p",
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[?MODULE, Why]),
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Err
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end
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end.
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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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start_link() ->
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supervisor:start_link({local, ?MODULE}, ?MODULE, []).
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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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is_started() ->
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whereis(?MODULE) /= undefined.
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-spec get_specs() -> [supervisor:child_spec()].
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get_specs() ->
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PoolSize = get_pool_size(),
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StartInterval = get_start_interval(),
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Server = get_riak_server(),
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Port = get_riak_port(),
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CACertFile = get_riak_cacertfile(),
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Username = get_riak_username(),
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Password = get_riak_password(),
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Options = lists:filter(
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fun(X) -> X /= nil end,
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[auto_reconnect,
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{keepalive, true},
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if CACertFile /= nil -> {cacertfile ,CACertFile};
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true -> nil
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end,
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if (Username /= nil) and (Password /= nil) ->
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{credentials, Username, Password};
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true -> nil
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end]),
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lists:map(
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fun(I) ->
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{ejabberd_riak:get_proc(I),
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{ejabberd_riak, start_link,
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[I, Server, Port, StartInterval, Options]},
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transient, 2000, worker, [?MODULE]}
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end, lists:seq(1, PoolSize)).
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get_start_interval() ->
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ejabberd_option:riak_start_interval().
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get_pool_size() ->
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ejabberd_option:riak_pool_size().
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get_riak_server() ->
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ejabberd_option:riak_server().
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get_riak_cacertfile() ->
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ejabberd_option:riak_cacertfile().
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get_riak_username() ->
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ejabberd_option:riak_username().
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get_riak_password() ->
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ejabberd_option:riak_password().
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get_riak_port() ->
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ejabberd_option:riak_port().
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get_pids() ->
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[ejabberd_riak:get_proc(I) || I <- lists:seq(1, get_pool_size())].
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get_random_pid() ->
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I = p1_rand:round_robin(get_pool_size()) + 1,
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ejabberd_riak:get_proc(I).
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