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Diffstat (limited to 'src/mod_bosh_redis.erl')
| -rw-r--r-- | src/mod_bosh_redis.erl | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/mod_bosh_redis.erl b/src/mod_bosh_redis.erl new file mode 100644 index 000000000..11cf430ac --- /dev/null +++ b/src/mod_bosh_redis.erl @@ -0,0 +1,150 @@ +%%%---------------------------------------------------------------------- +%%% File : mod_bosh_redis.erl +%%% Author : Evgeny Khramtsov <ekhramtsov@process-one.net> +%%% Purpose : +%%% Created : 28 Mar 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net> +%%% +%%% +%%% ejabberd, Copyright (C) 2017-2019 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(mod_bosh_redis). +-behaviour(mod_bosh). +-behaviour(gen_server). + +%% API +-export([init/0, open_session/2, close_session/1, find_session/1, + cache_nodes/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("bosh.hrl"). + +-record(state, {}). + +-define(BOSH_KEY, <<"ejabberd:bosh">>). + +%%%=================================================================== +%%% 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, [], []). + +open_session(SID, Pid) -> + PidBin = term_to_binary(Pid), + case ejabberd_redis:multi( + fun() -> + ejabberd_redis:hset(?BOSH_KEY, SID, PidBin), + ejabberd_redis:publish(?BOSH_KEY, SID) + end) of + {ok, _} -> + ok; + {error, _} -> + {error, db_failure} + end. + +close_session(SID) -> + case ejabberd_redis:multi( + fun() -> + ejabberd_redis:hdel(?BOSH_KEY, [SID]), + ejabberd_redis:publish(?BOSH_KEY, SID) + end) of + {ok, _} -> + ok; + {error, _} -> + {error, db_failure} + end. + +find_session(SID) -> + case ejabberd_redis:hget(?BOSH_KEY, SID) of + {ok, undefined} -> + {error, notfound}; + {ok, Pid} -> + try + {ok, binary_to_term(Pid)} + catch _:badarg -> + ?ERROR_MSG("Malformed data in redis (key = '~ts'): ~p", + [SID, Pid]), + {error, db_failure} + end; + {error, _} -> + {error, db_failure} + end. + +cache_nodes() -> + [node()]. + +%%%=================================================================== +%%% 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({redis_message, ?BOSH_KEY, SID}, State) -> + ets_cache:delete(?BOSH_CACHE, SID), + {noreply, State}; +handle_info(Info, State) -> + ?WARNING_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 BOSH sessions...", []), + case ejabberd_redis:hgetall(?BOSH_KEY) of + {ok, Vals} -> + ejabberd_redis:multi( + fun() -> + lists:foreach( + fun({SID, Pid}) when node(Pid) == node() -> + ejabberd_redis:hdel(?BOSH_KEY, [SID]); + (_) -> + ok + end, Vals) + end), + ok; + {error, _} -> + ?ERROR_MSG("Failed to clean bosh sessions in redis", []) + end. |