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%%%----------------------------------------------------------------------
%%% File : ejabberd_cluster.erl
%%% Author : Christophe Romain <christophe.romain@process-one.net>
%%% Purpose : Ejabberd clustering management
%%% Created : 7 Oct 2015 by Christophe Romain <christophe.romain@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 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_cluster).
%% API
-export([get_nodes/0, call/4, multicall/3, multicall/4]).
-export([join/1, leave/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-spec get_nodes() -> [node()].
get_nodes() ->
mnesia:system_info(running_db_nodes).
-spec call(node(), module(), atom(), [any()]) -> any().
call(Node, Module, Function, Args) ->
rpc:call(Node, Module, Function, Args, 5000).
-spec multicall(module(), atom(), [any()]) -> {list(), [node()]}.
multicall(Module, Function, Args) ->
multicall(get_nodes(), Module, Function, Args).
-spec multicall([node()], module(), atom(), list()) -> {list(), [node()]}.
multicall(Nodes, Module, Function, Args) ->
rpc:multicall(Nodes, Module, Function, Args, 5000).
-spec join(node()) -> ok | {error, any()}.
join(Node) ->
case {node(), net_adm:ping(Node)} of
{Node, _} ->
{error, {not_master, Node}};
{_, pong} ->
application:stop(ejabberd),
application:stop(mnesia),
mnesia:delete_schema([node()]),
application:start(mnesia),
mnesia:change_config(extra_db_nodes, [Node]),
mnesia:change_table_copy_type(schema, node(), disc_copies),
spawn(fun() ->
lists:foreach(fun(Table) ->
Type = call(Node, mnesia, table_info, [Table, storage_type]),
mnesia:add_table_copy(Table, node(), Type)
end, mnesia:system_info(tables)--[schema])
end),
application:start(ejabberd);
_ ->
{error, {no_ping, Node}}
end.
-spec leave(node()) -> ok | {error, any()}.
leave(Node) ->
case {node(), net_adm:ping(Node)} of
{Node, _} ->
Cluster = get_nodes()--[Node],
leave(Cluster, Node);
{_, pong} ->
rpc:call(Node, ?MODULE, leave, [Node], 10000);
{_, pang} ->
case mnesia:del_table_copy(schema, Node) of
{atomic, ok} -> ok;
{aborted, Reason} -> {error, Reason}
end
end.
leave([], Node) ->
{error, {no_cluster, Node}};
leave([Master|_], Node) ->
application:stop(ejabberd),
application:stop(mnesia),
call(Master, mnesia, del_table_copy, [schema, Node]),
spawn(fun() ->
mnesia:delete_schema([node()]),
erlang:halt(0)
end),
ok.
|
