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