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Diffstat (limited to 'src/ejabberd_router_redis.erl')
| -rw-r--r-- | src/ejabberd_router_redis.erl | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/ejabberd_router_redis.erl b/src/ejabberd_router_redis.erl new file mode 100644 index 000000000..b0f79d2a3 --- /dev/null +++ b/src/ejabberd_router_redis.erl @@ -0,0 +1,189 @@ +%%%------------------------------------------------------------------- +%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net> +%%% Created : 28 Mar 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net> +%%% +%%% +%%% ejabberd, Copyright (C) 2002-2019 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_router_redis). +-behaviour(ejabberd_router). +-behaviour(gen_server). + +%% API +-export([init/0, register_route/5, unregister_route/3, find_routes/1, + get_all_routes/0]). +%% gen_server callbacks +-export([init/1, handle_cast/2, handle_call/3, handle_info/2, + terminate/2, code_change/3, start_link/0]). + +-include("logger.hrl"). +-include("ejabberd_router.hrl"). + +-record(state, {}). + +-define(ROUTES_KEY, <<"ejabberd:routes">>). +-define(DOMAINS_KEY, <<"ejabberd:domains">>). + +%%%=================================================================== +%%% API +%%%=================================================================== +init() -> + Spec = {?MODULE, {?MODULE, start_link, []}, + transient, 5000, worker, [?MODULE]}, + case supervisor:start_child(ejabberd_backend_sup, Spec) of + {ok, _Pid} -> ok; + Err -> Err + end. + +-spec start_link() -> {ok, pid()} | {error, any()}. +start_link() -> + gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). + +register_route(Domain, ServerHost, LocalHint, _, Pid) -> + DomKey = domain_key(Domain), + PidKey = term_to_binary(Pid), + T = term_to_binary({ServerHost, LocalHint}), + case ejabberd_redis:multi( + fun() -> + ejabberd_redis:hset(DomKey, PidKey, T), + ejabberd_redis:sadd(?DOMAINS_KEY, [Domain]), + if Domain /= ServerHost -> + ejabberd_redis:sadd(?ROUTES_KEY, [Domain]); + true -> + ok + end + end) of + {ok, _} -> + ok; + {error, _} -> + {error, db_failure} + end. + +unregister_route(Domain, _, Pid) -> + DomKey = domain_key(Domain), + PidKey = term_to_binary(Pid), + try + {ok, Num} = ejabberd_redis:hdel(DomKey, [PidKey]), + if Num > 0 -> + {ok, Len} = ejabberd_redis:hlen(DomKey), + if Len == 0 -> + {ok, _} = ejabberd_redis:multi( + fun() -> + ejabberd_redis:del([DomKey]), + ejabberd_redis:srem(?ROUTES_KEY, [Domain]), + ejabberd_redis:srem(?DOMAINS_KEY, [Domain]) + end), + ok; + true -> + ok + end; + true -> + ok + end + catch _:{badmatch, {error, _}} -> + {error, db_failure} + end. + +find_routes(Domain) -> + DomKey = domain_key(Domain), + case ejabberd_redis:hgetall(DomKey) of + {ok, Vals} -> + {ok, decode_routes(Domain, Vals)}; + _ -> + {error, db_failure} + end. + +get_all_routes() -> + case ejabberd_redis:smembers(?ROUTES_KEY) of + {ok, Routes} -> + {ok, Routes}; + _ -> + {error, db_failure} + end. + +get_all_domains() -> + case ejabberd_redis:smembers(?DOMAINS_KEY) of + {ok, Domains} -> + {ok, Domains}; + _ -> + {error, db_failure} + end. + +%%%=================================================================== +%%% gen_server callbacks +%%%=================================================================== +init([]) -> + clean_table(), + {ok, #state{}}. + +handle_call(Request, From, State) -> + ?WARNING_MSG("Unexpected call from ~p: ~p", [From, Request]), + {noreply, State}. + +handle_cast(Msg, State) -> + ?WARNING_MSG("Unexpected cast: ~p", [Msg]), + {noreply, State}. + +handle_info(Info, State) -> + ?ERROR_MSG("Unexpected info: ~p", [Info]), + {noreply, State}. + +terminate(_Reason, _State) -> + ok. + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. + +%%%=================================================================== +%%% Internal functions +%%%=================================================================== +clean_table() -> + ?DEBUG("Cleaning Redis route entries...", []), + lists:foreach( + fun(#route{domain = Domain, pid = Pid}) when node(Pid) == node() -> + unregister_route(Domain, undefined, Pid); + (_) -> + ok + end, find_routes()). + +find_routes() -> + case get_all_domains() of + {ok, Domains} -> + lists:flatmap( + fun(Domain) -> + case find_routes(Domain) of + {ok, Routes} -> Routes; + {error, _} -> [] + end + end, Domains); + {error, _} -> + [] + end. + +domain_key(Domain) -> + <<"ejabberd:route:", Domain/binary>>. + +decode_routes(Domain, Vals) -> + lists:map( + fun({Pid, Data}) -> + {ServerHost, LocalHint} = binary_to_term(Data), + #route{domain = Domain, + pid = binary_to_term(Pid), + server_host = ServerHost, + local_hint = LocalHint} + end, Vals). |