134 lines
3.3 KiB
Erlang
134 lines
3.3 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%% @copyright (C) 2017, Evgeny Khramtsov
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%%% @doc
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%%%
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%%% @end
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%%% Created : 28 Mar 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%%-------------------------------------------------------------------
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-module(mod_bosh_redis).
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-behaviour(mod_bosh).
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-behaviour(gen_server).
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%% API
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-export([init/0, open_session/2, close_session/1, find_session/1,
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cache_nodes/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.hrl").
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-include("logger.hrl").
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-include("bosh.hrl").
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-record(state, {}).
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-define(BOSH_KEY, <<"ejabberd:bosh">>).
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%%%===================================================================
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%%% API
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%%%===================================================================
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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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open_session(SID, Pid) ->
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PidBin = term_to_binary(Pid),
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case ejabberd_redis:multi(
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fun() ->
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ejabberd_redis:hset(?BOSH_KEY, SID, PidBin),
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ejabberd_redis:publish(?BOSH_KEY, SID)
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end) of
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{ok, _} ->
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ok;
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{error, _} ->
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{error, db_failure}
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end.
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close_session(SID) ->
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case ejabberd_redis:multi(
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fun() ->
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ejabberd_redis:hdel(?BOSH_KEY, [SID]),
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ejabberd_redis:publish(?BOSH_KEY, SID)
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end) of
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{ok, _} ->
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ok;
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{error, _} ->
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{error, db_failure}
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end.
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find_session(SID) ->
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case ejabberd_redis:hget(?BOSH_KEY, SID) of
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{ok, undefined} ->
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{error, notfound};
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{ok, Pid} ->
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try
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{ok, binary_to_term(Pid)}
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catch _:badarg ->
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?ERROR_MSG("malformed data in redis (key = '~s'): ~p",
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[SID, Pid]),
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{error, db_failure}
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end;
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{error, _} ->
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{error, db_failure}
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end.
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cache_nodes() ->
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[node()].
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%%%===================================================================
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%%% gen_server callbacks
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%%%===================================================================
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init([]) ->
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clean_table(),
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{ok, #state{}}.
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info({redis_message, ?BOSH_KEY, SID}, State) ->
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ets_cache:delete(?BOSH_CACHE, SID),
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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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clean_table() ->
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?DEBUG("Cleaning Redis BOSH sessions...", []),
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case ejabberd_redis:hgetall(?BOSH_KEY) of
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{ok, Vals} ->
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ejabberd_redis:multi(
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fun() ->
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lists:foreach(
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fun({SID, Pid}) when node(Pid) == node() ->
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ejabberd_redis:hdel(?BOSH_KEY, [SID]);
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(_) ->
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ok
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end, Vals)
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end),
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ok;
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{error, _} ->
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?ERROR_MSG("failed to clean bosh sessions in redis", [])
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end.
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