mirror of
https://github.com/processone/ejabberd.git
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144 lines
3.9 KiB
Erlang
144 lines
3.9 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) 2002-2011 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
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_riak_sup).
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-author('alexey@process-one.net').
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%% API
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-export([start/0,
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start_link/0,
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init/1,
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add_pid/1,
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remove_pid/1,
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get_pids/0,
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get_random_pid/0
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]).
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-include("ejabberd.hrl").
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-define(DEFAULT_POOL_SIZE, 10).
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-define(DEFAULT_RIAK_START_INTERVAL, 30). % 30 seconds
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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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-record(riak_pool, {undefined, pid}).
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start() ->
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StartRiak = ejabberd_config:get_local_option(
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riak_server, fun(_) -> true end, false),
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if
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StartRiak ->
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do_start();
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true ->
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ok
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end.
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do_start() ->
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SupervisorName = ?MODULE,
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ChildSpec =
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{SupervisorName,
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{?MODULE, start_link, []},
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transient,
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infinity,
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supervisor,
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[?MODULE]},
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case supervisor:start_child(ejabberd_sup, ChildSpec) of
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{ok, _PID} ->
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ok;
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_Error ->
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?ERROR_MSG("Start of supervisor ~p failed:~n~p~nRetrying...~n",
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[SupervisorName, _Error]),
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timer:sleep(5000),
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start()
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end.
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start_link() ->
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mnesia:create_table(riak_pool,
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[{ram_copies, [node()]},
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{type, bag},
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{local_content, true},
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{attributes, record_info(fields, riak_pool)}]),
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mnesia:add_table_copy(riak_pool, node(), ram_copies),
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F = fun() ->
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mnesia:delete({riak_pool, undefined})
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end,
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mnesia:ets(F),
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supervisor:start_link({local, ?MODULE}, ?MODULE, []).
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init([]) ->
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PoolSize =
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ejabberd_config:get_local_option(
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riak_pool_size,
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fun(N) when is_integer(N), N >= 1 -> N end,
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?DEFAULT_POOL_SIZE),
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StartInterval =
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ejabberd_config:get_local_option(
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riak_start_interval,
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fun(N) when is_integer(N), N >= 1 -> N end,
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?DEFAULT_RIAK_START_INTERVAL),
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{Server, Port} =
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ejabberd_config:get_local_option(
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riak_server,
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fun({S, P}) when is_integer(P), P > 0, P < 65536 ->
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{binary_to_list(iolist_to_binary(S)), P}
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end, {"127.0.0.1", 8081}),
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{ok, {{one_for_one, PoolSize*10, 1},
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lists:map(
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fun(I) ->
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{I,
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{ejabberd_riak, start_link,
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[Server, Port, StartInterval*1000]},
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transient,
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2000,
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worker,
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[?MODULE]}
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end, lists:seq(1, PoolSize))}}.
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get_pids() ->
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Rs = mnesia:dirty_read(riak_pool, undefined),
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[R#riak_pool.pid || R <- Rs].
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get_random_pid() ->
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Pids = get_pids(),
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lists:nth(erlang:phash(now(), length(Pids)), Pids).
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add_pid(Pid) ->
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F = fun() ->
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mnesia:write(
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#riak_pool{pid = Pid})
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end,
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mnesia:ets(F).
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remove_pid(Pid) ->
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F = fun() ->
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mnesia:delete_object(
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#riak_pool{pid = Pid})
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end,
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mnesia:ets(F).
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