Merge pull request #1567 from terry-xiaoyu/clean_dead_session

clean dead persistent session on connect

src/emqttd_packet.erl

@@ -93,7 +93,7 @@ format_variable(#mqtt_packet_connect{
 
 format_variable(#mqtt_packet_connack{ack_flags   = AckFlags,
                                      return_code = ReturnCode}) ->
-    io_lib:format("AckFlags=~p, RetainCode=~p", [AckFlags, ReturnCode]);
+    io_lib:format("AckFlags=~p, ReturnCode=~p", [AckFlags, ReturnCode]);
 
 format_variable(#mqtt_packet_publish{topic_name = TopicName,
                                      packet_id  = PacketId}) ->

src/emqttd_protocol.erl

@@ -228,7 +228,8 @@ process(?CONNECT_PACKET(Var), State0) ->
                             %% ACCEPT
                             {?CONNACK_ACCEPT, SP, State2#proto_state{session = Session, is_superuser = IsSuperuser}};
                         {error, Error} ->
-                            {stop, {shutdown, Error}, State2}
+                            ?LOG(error, "Username '~s' login failed for ~p", [Username, Error], State2),
+                            {?CONNACK_SERVER, false, State2}
                     end;
                 {error, Reason}->
                     ?LOG(error, "Username '~s' login failed for ~p", [Username, Reason], State1),
@@ -593,4 +594,3 @@ unmount(MountPoint, Msg = #mqtt_message{topic = Topic}) ->
         {MountPoint, Topic0} -> Msg#mqtt_message{topic = Topic0};
         _ -> Msg
     end.
-

src/emqttd_sm.erl

@@ -183,15 +183,16 @@ handle_cast(Msg, State) ->
 handle_info({'DOWN', MRef, process, DownPid, _Reason}, State) ->
     case dict:find(MRef, State#state.monitors) of
         {ok, ClientId} ->
+            NewState =
               case mnesia:dirty_read({mqtt_session, ClientId}) of
-                [] ->
-                    ok;
+                  [] -> State;
                   [Sess = #mqtt_session{sess_pid = DownPid}] ->
-                    mnesia:dirty_delete_object(Sess);
+                      mnesia:dirty_delete_object(Sess),
+                      erase_monitor(MRef, State);
                   [_Sess] ->
-                    ok
+                      State
               end,
-            {noreply, erase_monitor(MRef, State), hibernate};
+            {noreply, NewState, hibernate};
         error ->
             lager:error("MRef of session ~p not found", [DownPid]),
             {noreply, State}
@@ -256,6 +257,7 @@ resume_session(Session = #mqtt_session{client_id = ClientId, sess_pid = SessPid}
             {ok, SessPid};
         false ->
             ?LOG(error, "Cannot resume ~p which seems already dead!", [SessPid], Session),
+            remove_session(Session),
             {error, session_died}
     end;
 
@@ -305,4 +307,3 @@ monitor_session(ClientId, SessPid, State = #state{monitors = Monitors}) ->
 erase_monitor(MRef, State = #state{monitors = Monitors}) ->
     erlang:demonitor(MRef, [flush]),
     State#state{monitors = dict:erase(MRef, Monitors)}.
-