support local route

src/emqttd_pubsub.erl

@@ -102,7 +102,7 @@ publish(Topic, Msg) ->
             ?MODULE:dispatch(To, Msg);
            (#mqtt_route{topic = To, node = Node}) ->
             rpc:cast(Node, ?MODULE, dispatch, [To, Msg])
-        end, emqttd_router:lookup(Topic)).
+        end, emqttd_router:match(Topic)).
 
 %% @doc Dispatch Message to Subscribers
 -spec(dispatch(binary(), mqtt_message()) -> ok).

src/emqttd_router.erl

@@ -16,6 +16,8 @@
 
 -module(emqttd_router).
 
+-author("Feng Lee <feng@emqtt.io>").
+
 -behaviour(gen_server).
 
 -include("emqttd.hrl").
@@ -27,18 +29,25 @@
 -copy_mnesia({mnesia, [copy]}).
 
 %% Start/Stop
--export([start_link/0, stop/0]).
+-export([start_link/0, topics/0, local_topics/0, stop/0]).
 
 %% Route APIs
--export([add_route/1, add_route/2, add_routes/1, lookup/1, print/1,
+-export([add_route/1, add_route/2, add_routes/1, match/1, print/1,
          del_route/1, del_route/2, del_routes/1, has_route/1]).
 
+%% Local Route API
+-export([add_local_route/1, del_local_route/1, match_local/1]).
+
 %% gen_server Function Exports
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
          terminate/2, code_change/3]).
 
+-export([dump/0]).
+
 -record(state, {stats_timer}).
 
+-define(ROUTER, ?MODULE).
+
 %%--------------------------------------------------------------------
 %% Mnesia Bootstrap
 %%--------------------------------------------------------------------
@@ -58,15 +67,21 @@ mnesia(copy) ->
 %%--------------------------------------------------------------------
 
 start_link() ->
-    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+    gen_server:start_link({local, ?ROUTER}, ?MODULE, [], []).
 
 %%--------------------------------------------------------------------
 %% API
 %%--------------------------------------------------------------------
 
-%% @doc Lookup Routes.
--spec(lookup(Topic:: binary()) -> [mqtt_route()]).
-lookup(Topic) when is_binary(Topic) ->
+topics() ->
+    mnesia:dirty_all_keys(route).
+
+local_topics() ->
+    ets:select(local_route, [{{'$1', '_'}, [], ['$1']}]).
+
+%% @doc Match Routes.
+-spec(match(Topic:: binary()) -> [mqtt_route()]).
+match(Topic) when is_binary(Topic) ->
     Matched = mnesia:async_dirty(fun emqttd_trie:match/1, [Topic]),
     %% Optimize: route table will be replicated to all nodes.
     lists:append([ets:lookup(route, To) || To <- [Topic | Matched]]).
@@ -75,7 +90,7 @@ lookup(Topic) when is_binary(Topic) ->
 -spec(print(Topic :: binary()) -> [ok]).
 print(Topic) ->
     [io:format("~s -> ~s~n", [To, Node]) ||
-        #mqtt_route{topic = To, node = Node} <- lookup(Topic)].
+        #mqtt_route{topic = To, node = Node} <- match(Topic)].
 
 %% @doc Add Route
 -spec(add_route(binary() | mqtt_route()) -> ok | {error, Reason :: any()}).
@@ -166,13 +181,35 @@ trans(Fun) ->
         {aborted, Error} -> {error, Error}
     end.
 
-stop() -> gen_server:call(?MODULE, stop).
+%%--------------------------------------------------------------------
+%% Local Route API
+%%--------------------------------------------------------------------
+
+-spec(add_local_route(binary()) -> ok).
+add_local_route(Topic) ->
+    gen_server:cast(?ROUTER, {add_local_route, Topic}).
+    
+-spec(del_local_route(binary()) -> ok).
+del_local_route(Topic) ->
+    gen_server:cast(?ROUTER, {del_local_route, Topic}).
+    
+-spec(match_local(binary()) -> [mqtt_route()]).
+match_local(Name) ->
+    [#mqtt_route{topic = {local, Filter}, node = Node}
+        || {Filter, Node} <- ets:tab2list(local_route),
+           emqttd_topic:match(Name, Filter)].
+
+dump() ->
+    [{route, ets:tab2list(route)}, {local_route, ets:tab2list(local_route)}].
+
+stop() -> gen_server:call(?ROUTER, stop).
 
 %%--------------------------------------------------------------------
 %% gen_server Callbacks
 %%--------------------------------------------------------------------
 
 init([]) ->
+    ets:new(local_route, [set, named_table, protected]),
     mnesia:subscribe(system),
     {ok, TRef}  = timer:send_interval(timer:seconds(1), stats),
     {ok, #state{stats_timer = TRef}}.
@@ -183,6 +220,15 @@ handle_call(stop, _From, State) ->
 handle_call(_Req, _From, State) ->
     {reply, ignore, State}.
 
+handle_cast({add_local_route, Topic}, State) ->
+    %% why node()...?
+    ets:insert(local_route, {Topic, node()}),
+    {noreply, State};
+    
+handle_cast({del_local_route, Topic}, State) ->
+    ets:delete(local_route, Topic),
+    {noreply, State};
+
 handle_cast(_Msg, State) ->
     {noreply, State}.