162 lines
4.5 KiB
Erlang
162 lines
4.5 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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get_pids/0,
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transform_options/1,
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get_random_pid/0,
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get_random_pid/1
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]).
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-include("ejabberd.hrl").
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-include("logger.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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-define(DEFAULT_RIAK_HOST, "127.0.0.1").
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-define(DEFAULT_RIAK_PORT, 8087).
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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 lists:any(
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fun(Host) ->
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is_riak_configured(Host)
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end, ?MYHOSTS) of
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true ->
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ejabberd:start_app(riakc),
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do_start();
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false ->
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ok
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end.
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is_riak_configured(Host) ->
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ServerConfigured = ejabberd_config:get_option(
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{riak_server, Host},
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fun(_) -> true end, false),
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PortConfigured = ejabberd_config:get_option(
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{riak_port, Host},
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fun(_) -> true end, false),
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AuthConfigured = lists:member(
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ejabberd_auth_riak,
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ejabberd_auth:auth_modules(Host)),
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Modules = ejabberd_config:get_option(
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{modules, Host},
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fun(L) when is_list(L) -> L end, []),
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ModuleWithRiakDBConfigured = lists:any(
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fun({_Module, Opts}) ->
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gen_mod:db_type(Opts) == riak
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end, Modules),
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ServerConfigured or PortConfigured
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or AuthConfigured or ModuleWithRiakDBConfigured.
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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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supervisor:start_link({local, ?MODULE}, ?MODULE, []).
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init([]) ->
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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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{ok, {{one_for_one, PoolSize*10, 1},
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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*1000]},
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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_config:get_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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get_pool_size() ->
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ejabberd_config:get_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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get_riak_server() ->
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ejabberd_config:get_option(
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riak_server,
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fun(S) ->
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binary_to_list(iolist_to_binary(S))
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end, ?DEFAULT_RIAK_HOST).
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get_riak_port() ->
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ejabberd_config:get_option(
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riak_port,
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fun(P) when is_integer(P), P > 0, P < 65536 -> P end,
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?DEFAULT_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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get_random_pid(now()).
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get_random_pid(Term) ->
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I = erlang:phash2(Term, get_pool_size()) + 1,
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ejabberd_riak:get_proc(I).
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transform_options(Opts) ->
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lists:foldl(fun transform_options/2, [], Opts).
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transform_options({riak_server, {S, P}}, Opts) ->
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[{riak_server, S}, {riak_port, P}|Opts];
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transform_options(Opt, Opts) ->
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[Opt|Opts].
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