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|
%%%----------------------------------------------------------------------
%%% File : ejabberd_riak_sup.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Riak connections supervisor
%%% Created : 29 Dec 2011 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2019 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_riak_sup).
-behaviour(supervisor).
-author('alexey@process-one.net').
-export([start/0, start_link/0, init/1, get_pids/0,
get_random_pid/0, config_reloaded/0]).
-include("logger.hrl").
% time to wait for the supervisor to start its child before returning
% a timeout error to the request
-define(CONNECT_TIMEOUT, 500). % milliseconds
start() ->
case is_started() of
true -> ok;
false ->
ejabberd:start_app(riakc),
Spec = {?MODULE, {?MODULE, start_link, []},
permanent, infinity, supervisor, [?MODULE]},
case supervisor:start_child(ejabberd_db_sup, Spec) of
{ok, _} -> ok;
{error, {already_started, _}} -> ok;
{error, Why} = Err ->
?ERROR_MSG("Failed to start ~s: ~p",
[?MODULE, Why]),
Err
end
end.
config_reloaded() ->
case is_started() of
true ->
lists:foreach(
fun(Spec) ->
supervisor:start_child(?MODULE, Spec)
end, get_specs()),
PoolSize = get_pool_size(),
lists:foreach(
fun({Id, _, _, _}) when Id > PoolSize ->
case supervisor:terminate_child(?MODULE, Id) of
ok -> supervisor:delete_child(?MODULE, Id);
_ -> ok
end;
(_) ->
ok
end, supervisor:which_children(?MODULE));
false ->
ok
end.
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
init([]) ->
ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 20),
{ok, {{one_for_one, 500, 1}, get_specs()}}.
is_started() ->
whereis(?MODULE) /= undefined.
-spec get_specs() -> [supervisor:child_spec()].
get_specs() ->
PoolSize = get_pool_size(),
StartInterval = get_start_interval(),
Server = get_riak_server(),
Port = get_riak_port(),
CACertFile = get_riak_cacertfile(),
Username = get_riak_username(),
Password = get_riak_password(),
Options = lists:filter(
fun(X) -> X /= nil end,
[auto_reconnect,
{keepalive, true},
if CACertFile /= nil -> {cacertfile ,CACertFile};
true -> nil
end,
if (Username /= nil) and (Password /= nil) ->
{credentials, Username, Password};
true -> nil
end]),
lists:map(
fun(I) ->
{ejabberd_riak:get_proc(I),
{ejabberd_riak, start_link,
[I, Server, Port, StartInterval, Options]},
transient, 2000, worker, [?MODULE]}
end, lists:seq(1, PoolSize)).
get_start_interval() ->
ejabberd_option:riak_start_interval().
get_pool_size() ->
ejabberd_option:riak_pool_size().
get_riak_server() ->
ejabberd_option:riak_server().
get_riak_cacertfile() ->
ejabberd_option:riak_cacertfile().
get_riak_username() ->
ejabberd_option:riak_username().
get_riak_password() ->
ejabberd_option:riak_password().
get_riak_port() ->
ejabberd_option:riak_port().
get_pids() ->
[ejabberd_riak:get_proc(I) || I <- lists:seq(1, get_pool_size())].
get_random_pid() ->
I = p1_rand:round_robin(get_pool_size()) + 1,
ejabberd_riak:get_proc(I).
|
