Add Redis as mod_bosh RAM backend

src/mod_bosh_redis.erl

@@ -0,0 +1,76 @@
+%%%-------------------------------------------------------------------
+%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
+%%% @copyright (C) 2017, Evgeny Khramtsov
+%%% @doc
+%%%
+%%% @end
+%%% Created : 28 Mar 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
+%%%-------------------------------------------------------------------
+-module(mod_bosh_redis).
+-behaviour(mod_bosh).
+
+%% API
+-export([init/0, open_session/2, close_session/1, find_session/1]).
+
+-include("ejabberd.hrl").
+-include("logger.hrl").
+
+-define(BOSH_KEY, "ejabberd:bosh").
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+init() ->
+    clean_table().
+
+open_session(SID, Pid) ->
+    PidBin = term_to_binary(Pid),
+    case ejabberd_redis:q(["HSET", ?BOSH_KEY, SID, PidBin]) of
+	{ok, _} ->
+	    ok;
+	Err ->
+	    ?ERROR_MSG("failed to register bosh session in redis: ~p", [Err]),
+	    Err
+    end.
+
+close_session(SID) ->
+    case ejabberd_redis:q(["HDEL", ?BOSH_KEY, SID]) of
+	{ok, _} ->
+	    ok;
+	Err ->
+	    ?ERROR_MSG("failed to delete bosh session in redis: ~p", [Err])
+    end.
+
+find_session(SID) ->
+    case ejabberd_redis:q(["HGET", ?BOSH_KEY, SID]) of
+	{ok, Pid} when is_binary(Pid) ->
+	    {ok, binary_to_term(Pid)};
+	{ok, _} ->
+	    error;
+	Err ->
+	    ?ERROR_MSG("failed to lookup bosh session in redis: ~p", [Err]),
+	    error
+    end.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
+clean_table() ->
+    ?INFO_MSG("Cleaning Redis BOSH table...", []),
+    case ejabberd_redis:q(["HGETALL", ?BOSH_KEY]) of
+	{ok, Vals} ->
+	    clean_table(Vals);
+	Err ->
+	    ?ERROR_MSG("failed to clean bosh table in redis: ~p", [Err])
+    end.
+
+clean_table([SID, PidBin|Vals]) ->
+    case binary_to_term(PidBin) of
+	Pid when node(Pid) == node() ->
+	    close_session(SID);
+	_ ->
+	    ok
+    end,
+    clean_table(Vals);
+clean_table([]) ->
+    ok.