mirror of
https://github.com/processone/ejabberd.git
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155 lines
4.6 KiB
Erlang
155 lines
4.6 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_cluster_mnesia.erl
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%%% Author : Christophe Romain <christophe.romain@process-one.net>
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%%% Purpose : Ejabberd clustering management via Mnesia
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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) 2002-2019 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_mnesia).
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-behaviour(ejabberd_cluster).
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%% API
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-export([init/0, get_nodes/0, join/1, leave/1,
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get_known_nodes/0, node_id/0, get_node_by_id/1,
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send/2, wait_for_sync/1, subscribe/1]).
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-include("logger.hrl").
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-spec init() -> ok.
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init() ->
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ok.
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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 get_known_nodes() -> [node()].
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get_known_nodes() ->
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lists:usort(mnesia:system_info(db_nodes)
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++ mnesia:system_info(extra_db_nodes)).
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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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case mnesia:change_config(extra_db_nodes, [Node]) of
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{ok, _} ->
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replicate_database(Node),
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wait_for_sync(infinity),
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application:stop(mnesia),
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application:start(ejabberd);
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{error, Reason} ->
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{error, Reason}
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end;
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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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spawn(fun() ->
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rpc:call(Master, mnesia, del_table_copy, [schema, Node]),
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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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-spec node_id() -> binary().
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node_id() ->
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integer_to_binary(erlang:phash2(node())).
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-spec get_node_by_id(binary()) -> node().
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get_node_by_id(Hash) ->
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try binary_to_integer(Hash) of
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I -> match_node_id(I)
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catch _:_ ->
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node()
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end.
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-spec send({atom(), node()}, term()) -> boolean().
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send(Dst, Msg) ->
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case erlang:send(Dst, Msg, [nosuspend, noconnect]) of
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ok -> true;
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_ -> false
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end.
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-spec wait_for_sync(timeout()) -> ok.
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wait_for_sync(Timeout) ->
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?INFO_MSG("Waiting for Mnesia synchronization to complete", []),
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mnesia:wait_for_tables(mnesia:system_info(local_tables), Timeout),
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ok.
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-spec subscribe(_) -> ok.
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subscribe(_) ->
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ok.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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replicate_database(Node) ->
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mnesia:change_table_copy_type(schema, node(), disc_copies),
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lists:foreach(
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fun(Table) ->
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Type = rpc: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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-spec match_node_id(integer()) -> node().
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match_node_id(I) ->
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match_node_id(I, get_nodes()).
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-spec match_node_id(integer(), [node()]) -> node().
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match_node_id(I, [Node|Nodes]) ->
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case erlang:phash2(Node) of
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I -> Node;
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_ -> match_node_id(I, Nodes)
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end;
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match_node_id(_I, []) ->
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node().
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