Add Riak as router RAM backend

diff --git a/src/ejabberd_router_riak.erl b/src/ejabberd_router_riak.erl
new file mode 100644 (file)
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+++ b/src/ejabberd_router_riak.erl
@@ -0,0 +1,83 @@
+%%%-------------------------------------------------------------------
+%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
+%%% Created : 15 Apr 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
+%%%
+%%%
+%%% ejabberd, Copyright (C) 2002-2017   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_riak).
+-behaviour(ejabberd_router).
+
+%% API
+-export([init/0, register_route/5, unregister_route/3, find_routes/1,
+        get_all_routes/0]).
+
+-include("logger.hrl").
+-include("ejabberd_router.hrl").
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+init() ->
+    clean_table().
+
+register_route(Domain, ServerHost, LocalHint, _, Pid) ->
+    ejabberd_riak:put(#route{domain = Domain,
+                            server_host = ServerHost,
+                            local_hint = LocalHint,
+                            pid = Pid},
+                     route_schema(),
+                     [{i, {Domain, Pid}}, {'2i', [{<<"route">>, Domain}]}]).
+
+unregister_route(Domain, _, Pid) ->
+    ejabberd_riak:delete(route, {Domain, Pid}).
+
+find_routes(Domain) ->
+    ejabberd_riak:get_by_index(route, route_schema(), <<"route">>, Domain).
+
+get_all_routes() ->
+    case ejabberd_riak:get(route, route_schema()) of
+       {ok, Routes} ->
+           {ok, lists:flatmap(
+                  fun(#route{domain = D, server_host = S}) when D /= S ->
+                          [D];
+                     (_) ->
+                          []
+                  end, Routes)};
+       Err ->
+           Err
+    end.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
+route_schema() ->
+    {record_info(fields, route), #route{}}.
+
+clean_table() ->
+    ?INFO_MSG("Cleaning Riak 'route' table...", []),
+    case ejabberd_riak:get(route, route_schema()) of
+       {ok, Routes} ->
+           lists:foreach(
+             fun(#route{pid = Pid}) ->
+                     ejabberd_riak:delete(route, Pid)
+             end, Routes);
+       {error, Err} ->
+           ?ERROR_MSG("failed to clean Riak 'route' table: ~p", [Err]),
+           Err
+    end.