Chapril/xmpp.chapril.org-ejabberd
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Make ejabberd_cluster modular

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For setting the cluster backend new global option 'cluster_backend' is
introduced. The default and only available value at the moment is 'mnesia'
This commit is contained in:
Evgeniy Khramtsov 2017-07-06 15:47:00 +03:00
parent 56d273477e
commit ffdaff3740
6 changed files with 300 additions and 130 deletions
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25
src/ejabberd_app.erl
View File

@ -25,12 +25,11 @@
-module(ejabberd_app).
-behaviour(ejabberd_config).
-author('alexey@process-one.net').
-behaviour(application).
-export([start/2, prep_stop/1, stop/1, opt_type/1]).
-export([start/2, prep_stop/1, stop/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
@ -49,13 +48,12 @@ start(normal, _Args) ->
setup_if_elixir_conf_used(),
ejabberd_config:start(),
ejabberd_mnesia:start(),
set_settings_from_config(),
file_queue_init(),
maybe_add_nameservers(),
connect_nodes(),
case ejabberd_sup:start_link() of
{ok, SupPid} ->
register_elixir_config_hooks(),
ejabberd_cluster:wait_for_sync(infinity),
{T2, _} = statistics(wall_clock),
?INFO_MSG("ejabberd ~s is started in the node ~p in ~.2fs",
[?VERSION, node(), (T2-T1)/1000]),
@ -88,12 +86,6 @@ stop(_State) ->
%%% Internal functions
%%%
connect_nodes() ->
Nodes = ejabberd_config:get_option(cluster_nodes, []),
lists:foreach(fun(Node) ->
net_kernel:connect_node(Node)
end, Nodes).
%% If ejabberd is running on some Windows machine, get nameservers and add to Erlang
maybe_add_nameservers() ->
case os:type() of
@ -136,10 +128,6 @@ delete_pid_file() ->
file:delete(PidFilename)
end.
set_settings_from_config() ->
Ticktime = ejabberd_config:get_option(net_ticktime, 60),
net_kernel:set_net_ticktime(Ticktime).
file_queue_init() ->
QueueDir = case ejabberd_config:queue_dir() of
undefined ->
@ -160,15 +148,6 @@ start_apps() ->
ejabberd:start_app(xmpp),
ejabberd:start_app(cache_tab).
-spec opt_type(net_ticktime) -> fun((pos_integer()) -> pos_integer());
(cluster_nodes) -> fun(([node()]) -> [node()]);
(atom()) -> atom().
opt_type(net_ticktime) ->
fun (P) when is_integer(P), P > 0 -> P end;
opt_type(cluster_nodes) ->
fun (Ns) -> true = lists:all(fun is_atom/1, Ns), Ns end;
opt_type(_) -> [cluster_nodes, net_ticktime].
setup_if_elixir_conf_used() ->
case ejabberd_config:is_using_elixir_config() of
true -> 'Elixir.Ejabberd.Config.Store':start_link();

250
src/ejabberd_cluster.erl
View File

@ -1,152 +1,192 @@
%%%----------------------------------------------------------------------
%%% 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>
%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2017, Evgeny Khramtsov
%%% @doc
%%%
%%%
%%% 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.
%%%
%%%----------------------------------------------------------------------
%%% @end
%%% Created : 5 Jul 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(ejabberd_cluster).
-behaviour(ejabberd_config).
-behaviour(gen_server).
%% API
-export([get_nodes/0, call/4, multicall/3, multicall/4,
eval_everywhere/3, eval_everywhere/4]).
-export([join/1, leave/1, get_known_nodes/0]).
-export([node_id/0, get_node_by_id/1]).
-export([start_link/0, call/4, multicall/3, multicall/4, eval_everywhere/3,
eval_everywhere/4]).
%% Backend dependent API
-export([get_nodes/0, get_known_nodes/0, join/1, leave/1, subscribe/0,
subscribe/1, node_id/0, get_node_by_id/1, send/2, wait_for_sync/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([opt_type/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-spec get_nodes() -> [node()].
-type dst() :: pid() | atom() | {atom(), node()}.
get_nodes() ->
mnesia:system_info(running_db_nodes).
-callback init() -> ok | {error, any()}.
-callback get_nodes() -> [node()].
-callback get_known_nodes() -> [node()].
-callback join(node()) -> ok | {error, any()}.
-callback leave(node()) -> ok | {error, any()}.
-callback node_id() -> binary().
-callback get_node_by_id(binary()) -> node().
-callback send({atom(), node()}, term()) -> boolean().
-callback wait_for_sync(timeout()) -> ok | {error, any()}.
-callback subscribe(dst()) -> ok.
-spec get_known_nodes() -> [node()].
-record(state, {}).
get_known_nodes() ->
lists:usort(mnesia:system_info(db_nodes)
++ mnesia:system_info(extra_db_nodes)).
%%%===================================================================
%%% API
%%%===================================================================
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
-spec call(node(), module(), atom(), [any()]) -> any().
call(Node, Module, Function, Args) ->
rpc:call(Node, Module, Function, Args, 5000).
rpc:call(Node, Module, Function, Args, rpc_timeout()).
-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).
rpc:multicall(Nodes, Module, Function, Args, rpc_timeout()).
-spec eval_everywhere(module(), atom(), [any()]) -> ok.
eval_everywhere(Module, Function, Args) ->
eval_everywhere(get_nodes(), Module, Function, Args),
ok.
-spec eval_everywhere([node()], module(), atom(), [any()]) -> ok.
eval_everywhere(Nodes, Module, Function, Args) ->
rpc:eval_everywhere(Nodes, Module, Function, Args),
ok.
-spec join(node()) -> ok | {error, any()}.
%%%===================================================================
%%% Backend dependent API
%%%===================================================================
-spec get_nodes() -> [node()].
get_nodes() ->
Mod = get_mod(),
Mod:get_nodes().
-spec get_known_nodes() -> [node()].
get_known_nodes() ->
Mod = get_mod(),
Mod:get_known_nodes().
-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.
Mod = get_mod(),
Mod:join(Node).
-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.
Mod = get_mod(),
Mod:leave(Node).
-spec node_id() -> binary().
node_id() ->
integer_to_binary(erlang:phash2(node())).
Mod = get_mod(),
Mod:node_id().
-spec get_node_by_id(binary()) -> node().
get_node_by_id(Hash) ->
try binary_to_integer(Hash) of
I -> match_node_id(I)
catch _:_ ->
node()
get_node_by_id(ID) ->
Mod = get_mod(),
Mod:get_node_by_id(ID).
-spec send(dst(), term()) -> boolean().
send(Dst, Msg) ->
IsLocal = case Dst of
{_, Node} -> Node == node();
Pid when is_pid(Pid) -> node(Pid) == node();
Name when is_atom(Name) -> true;
_ -> false
end,
if IsLocal ->
erlang:send(Dst, Msg),
true;
true ->
Mod = get_mod(),
Mod:send(Dst, Msg)
end.
-spec wait_for_sync(timeout()) -> ok | {error, any()}.
wait_for_sync(Timeout) ->
Mod = get_mod(),
Mod:wait_for_sync(Timeout).
-spec subscribe() -> ok.
subscribe() ->
subscribe(self()).
-spec subscribe(dst()) -> ok.
subscribe(Proc) ->
Mod = get_mod(),
Mod:subscribe(Proc).
%%%===================================================================
%%% gen_server API
%%%===================================================================
init([]) ->
Ticktime = ejabberd_config:get_option(net_ticktime, 60),
Nodes = ejabberd_config:get_option(cluster_nodes, []),
net_kernel:set_net_ticktime(Ticktime),
lists:foreach(fun(Node) ->
net_kernel:connect_node(Node)
end, Nodes),
Mod = get_mod(),
case Mod:init() of
ok ->
Mod:subscribe(?MODULE),
{ok, #state{}};
{error, Reason} ->
{stop, Reason}
end.
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info({node_up, Node}, State) ->
?INFO_MSG("Node ~s has joined", [Node]),
{noreply, State};
handle_info({node_down, Node}, State) ->
?INFO_MSG("Node ~s has left", [Node]),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
-spec match_node_id(integer()) -> node().
match_node_id(I) ->
match_node_id(I, get_nodes()).
get_mod() ->
Backend = ejabberd_config:get_option(cluster_backend, mnesia),
list_to_atom("ejabberd_cluster_" ++ atom_to_list(Backend)).
-spec match_node_id(integer(), [node()]) -> node().
match_node_id(I, [Node|Nodes]) ->
case erlang:phash2(Node) of
I -> Node;
_ -> match_node_id(I, Nodes)
end;
match_node_id(_I, []) ->
node().
rpc_timeout() ->
timer:seconds(ejabberd_config:get_option(rpc_timeout, 5)).
opt_type(net_ticktime) ->
fun (P) when is_integer(P), P > 0 -> P end;
opt_type(cluster_nodes) ->
fun (Ns) -> true = lists:all(fun is_atom/1, Ns), Ns end;
opt_type(rpc_timeout) ->
fun (T) when is_integer(T), T > 0 -> T end;
opt_type(cluster_backend) ->
fun (T) -> ejabberd_config:v_db(?MODULE, T) end;
opt_type(_) ->
[rpc_timeout, cluster_backend, cluster_nodes, net_ticktime].

144
src/ejabberd_cluster_mnesia.erl Normal file
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@ -0,0 +1,144 @@
%%%----------------------------------------------------------------------
%%% 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_mnesia).
-behaviour(ejabberd_cluster).
%% API
-export([init/0, get_nodes/0, join/1, leave/1,
get_known_nodes/0, node_id/0, get_node_by_id/1,
send/2, wait_for_sync/1, subscribe/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-spec init() -> ok.
init() ->
ok.
-spec get_nodes() -> [node()].
get_nodes() ->
mnesia:system_info(running_db_nodes).
-spec get_known_nodes() -> [node()].
get_known_nodes() ->
lists:usort(mnesia:system_info(db_nodes)
++ mnesia:system_info(extra_db_nodes)).
-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 = ejabberd_cluster: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),
ejabberd_cluster:call(Master, mnesia, del_table_copy, [schema, Node]),
spawn(fun() ->
mnesia:delete_schema([node()]),
erlang:halt(0)
end),
ok.
-spec node_id() -> binary().
node_id() ->
integer_to_binary(erlang:phash2(node())).
-spec get_node_by_id(binary()) -> node().
get_node_by_id(Hash) ->
try binary_to_integer(Hash) of
I -> match_node_id(I)
catch _:_ ->
node()
end.
-spec send({atom(), node()}, term()) -> boolean().
send(Dst, Msg) ->
erlang:send(Dst, Msg).
-spec wait_for_sync(timeout()) -> ok.
wait_for_sync(Timeout) ->
?INFO_MSG("Waiting for Mnesia synchronization to complete", []),
mnesia:wait_for_tables(mnesia:system_info(local_tables), Timeout),
ok.
-spec subscribe(_) -> ok.
subscribe(_) ->
ok.
%%%===================================================================
%%% Internal functions
%%%===================================================================
-spec match_node_id(integer()) -> node().
match_node_id(I) ->
match_node_id(I, get_nodes()).
-spec match_node_id(integer(), [node()]) -> node().
match_node_id(I, [Node|Nodes]) ->
case erlang:phash2(Node) of
I -> Node;
_ -> match_node_id(I, Nodes)
end;
match_node_id(_I, []) ->
node().

2
src/ejabberd_listener.erl
View File

@ -109,6 +109,7 @@ init_udp(PortIP, Module, Opts, SockOpts, Port, IPS) ->
{ok, Socket} ->
%% Inform my parent that this port was opened succesfully
proc_lib:init_ack({ok, self()}),
application:ensure_started(ejabberd),
start_module_sup(Port, Module),
?INFO_MSG("Start accepting UDP connections at ~s for ~p",
[format_portip(PortIP), Module]),
@ -134,6 +135,7 @@ init_tcp(PortIP, Module, Opts, SockOpts, Port, IPS) ->
ListenSocket = listen_tcp(PortIP, Module, SockOpts, Port, IPS),
%% Inform my parent that this port was opened succesfully
proc_lib:init_ack({ok, self()}),
application:ensure_started(ejabberd),
start_module_sup(Port, Module),
?INFO_MSG("Start accepting TCP connections at ~s for ~p",
[format_portip(PortIP), Module]),

2
src/ejabberd_mnesia.erl
View File

@ -68,8 +68,6 @@ init([]) ->
_ -> ok
end,
ejabberd:start_app(mnesia, permanent),
?DEBUG("Waiting for Mnesia tables synchronization...", []),
mnesia:wait_for_tables(mnesia:system_info(local_tables), infinity),
Schema = read_schema_file(),
{ok, #state{schema = Schema}};
false ->

7
src/ejabberd_sup.erl
View File

@ -41,6 +41,12 @@ init([]) ->
brutal_kill,
worker,
[ejabberd_hooks]},
Cluster = {ejabberd_cluster,
{ejabberd_cluster, start_link, []},
permanent,
5000,
worker,
[ejabberd_cluster]},
SystemMonitor =
{ejabberd_system_monitor,
{ejabberd_system_monitor, start_link, []},
@ -152,6 +158,7 @@ init([]) ->
permanent, 5000, worker, [ejabberd_pkix]},
{ok, {{one_for_one, 10, 1},
[Hooks,
Cluster,
CyrSASL,
Translation,
AccessPerms,