mirror of
https://github.com/processone/ejabberd.git
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237 lines
6.5 KiB
Erlang
237 lines
6.5 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% Created : 11 Jan 2017 by Evgeny Khramtsov <ekhramtsov@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_router_mnesia).
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-behaviour(ejabberd_router).
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-behaviour(gen_server).
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%% API
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-export([init/0, register_route/5, unregister_route/3, find_routes/1,
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get_all_routes/0, use_cache/0]).
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%% gen_server callbacks
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-export([init/1, handle_cast/2, handle_call/3, handle_info/2,
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terminate/2, code_change/3, start_link/0]).
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-include("ejabberd_router.hrl").
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-include("logger.hrl").
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-include_lib("stdlib/include/ms_transform.hrl").
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-record(state, {}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec init() -> ok | {error, any()}.
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init() ->
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Spec = {?MODULE, {?MODULE, start_link, []},
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transient, 5000, worker, [?MODULE]},
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case supervisor:start_child(ejabberd_backend_sup, Spec) of
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{ok, _Pid} -> ok;
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Err -> Err
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end.
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-spec start_link() -> {ok, pid()} | {error, any()}.
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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use_cache() ->
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false.
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register_route(Domain, ServerHost, LocalHint, undefined, Pid) ->
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F = fun () ->
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mnesia:write(#route{domain = Domain,
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pid = Pid,
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server_host = ServerHost,
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local_hint = LocalHint})
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end,
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transaction(F);
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register_route(Domain, ServerHost, _LocalHint, N, Pid) ->
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F = fun () ->
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case mnesia:wread({route, Domain}) of
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[] ->
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mnesia:write(#route{domain = Domain,
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server_host = ServerHost,
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pid = Pid,
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local_hint = 1}),
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lists:foreach(
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fun (I) ->
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mnesia:write(
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#route{domain = Domain,
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pid = undefined,
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server_host = ServerHost,
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local_hint = I})
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end,
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lists:seq(2, N));
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Rs ->
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lists:any(
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fun (#route{pid = undefined,
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local_hint = I} = R) ->
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mnesia:write(
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#route{domain = Domain,
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pid = Pid,
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server_host = ServerHost,
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local_hint = I}),
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mnesia:delete_object(R),
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true;
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(_) -> false
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end,
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Rs)
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end
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end,
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transaction(F).
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unregister_route(Domain, undefined, Pid) ->
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F = fun () ->
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case mnesia:select(
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route,
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ets:fun2ms(
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fun(#route{domain = D, pid = P} = R)
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when D == Domain, P == Pid -> R
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end)) of
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[R] -> mnesia:delete_object(R);
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_ -> ok
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end
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end,
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transaction(F);
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unregister_route(Domain, _, Pid) ->
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F = fun () ->
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case mnesia:select(
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route,
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ets:fun2ms(
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fun(#route{domain = D, pid = P} = R)
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when D == Domain, P == Pid -> R
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end)) of
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[R] ->
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I = R#route.local_hint,
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ServerHost = R#route.server_host,
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mnesia:write(#route{domain = Domain,
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server_host = ServerHost,
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pid = undefined,
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local_hint = I}),
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mnesia:delete_object(R);
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_ -> ok
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end
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end,
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transaction(F).
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find_routes(Domain) ->
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{ok, mnesia:dirty_read(route, Domain)}.
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get_all_routes() ->
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{ok, mnesia:dirty_select(
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route,
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ets:fun2ms(
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fun(#route{domain = Domain, server_host = ServerHost})
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when Domain /= ServerHost -> Domain
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end))}.
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%%%===================================================================
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%%% gen_server callbacks
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%%%===================================================================
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init([]) ->
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update_tables(),
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ejabberd_mnesia:create(?MODULE, route,
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[{ram_copies, [node()]},
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{type, bag},
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{attributes, record_info(fields, route)}]),
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mnesia:subscribe({table, route, simple}),
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lists:foreach(
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fun (Pid) -> erlang:monitor(process, Pid) end,
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mnesia:dirty_select(
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route,
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ets:fun2ms(
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fun(#route{pid = Pid}) -> Pid end))),
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{ok, #state{}}.
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handle_call(Request, From, State) ->
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?WARNING_MSG("Unexpected call from ~p: ~p", [From, Request]),
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{noreply, State}.
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handle_cast(Msg, State) ->
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?WARNING_MSG("Unexpected cast: ~p", [Msg]),
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{noreply, State}.
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handle_info({mnesia_table_event,
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{write, #route{pid = Pid}, _ActivityId}}, State) ->
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erlang:monitor(process, Pid),
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{noreply, State};
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handle_info({mnesia_table_event, _}, State) ->
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{noreply, State};
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handle_info({'DOWN', _Ref, _Type, Pid, _Info}, State) ->
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F = fun () ->
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Es = mnesia:select(
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route,
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ets:fun2ms(
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fun(#route{pid = P} = E)
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when P == Pid -> E
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end)),
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lists:foreach(
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fun(E) ->
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if is_integer(E#route.local_hint) ->
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LDomain = E#route.domain,
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I = E#route.local_hint,
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ServerHost = E#route.server_host,
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mnesia:write(#route{domain = LDomain,
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server_host = ServerHost,
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pid = undefined,
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local_hint = I}),
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mnesia:delete_object(E);
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true ->
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mnesia:delete_object(E)
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end
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end, Es)
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end,
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transaction(F),
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{noreply, State};
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handle_info(Info, State) ->
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?ERROR_MSG("Unexpected info: ~p", [Info]),
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{noreply, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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transaction(F) ->
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case mnesia:transaction(F) of
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{atomic, _} ->
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ok;
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{aborted, Reason} ->
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?ERROR_MSG("Mnesia transaction failed: ~p", [Reason]),
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{error, db_failure}
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end.
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-spec update_tables() -> ok.
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update_tables() ->
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try
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mnesia:transform_table(route, ignore, record_info(fields, route))
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catch exit:{aborted, {no_exists, _}} ->
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ok
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end,
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case lists:member(local_route, mnesia:system_info(tables)) of
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true -> mnesia:delete_table(local_route);
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false -> ok
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end.
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