Use monitors to track muc rooms

This should prevent keeping rooms that were hard killed from in
online table.

src/mod_muc.erl

@@ -42,6 +42,7 @@
 	 store_room/5,
 	 restore_room/3,
 	 forget_room/3,
+	 create_room/3,
 	 create_room/5,
 	 shutdown_rooms/1,
 	 process_disco_info/1,
@@ -99,6 +100,7 @@
 -callback register_online_room(binary(), binary(), binary(), pid()) -> any().
 -callback unregister_online_room(binary(), binary(), binary(), pid()) -> any().
 -callback find_online_room(binary(), binary(), binary()) -> {ok, pid()} | error.
+-callback find_online_room_by_pid(binary(), pid()) -> {ok, binary(), binary()} | error.
 -callback get_online_rooms(binary(), binary(), undefined | rsm_set()) -> [{binary(), binary(), pid()}].
 -callback count_online_rooms(binary(), binary()) -> non_neg_integer().
 -callback rsm_supported() -> boolean().
@@ -295,6 +297,14 @@ create_room(Host, Name, From, Nick, Opts) ->
     Proc = procname(ServerHost, {Name, Host}),
     ?GEN_SERVER:call(Proc, {create, Name, Host, From, Nick, Opts}).
 
+%% @doc Create a room.
+%% If Opts = default, the default room options are used.
+%% Else use the passed options as defined in mod_muc_room.
+create_room(Host, Name, Opts) ->
+    ServerHost = ejabberd_router:host_of_route(Host),
+    Proc = procname(ServerHost, {Name, Host}),
+    ?GEN_SERVER:call(Proc, {create, Name, Host, Opts}).
+
 store_room(ServerHost, Host, Name, Opts) ->
     store_room(ServerHost, Host, Name, Opts, undefined).
 
@@ -379,6 +389,25 @@ init([Host, Worker]) ->
 			 {stop, normal, ok, state()}.
 handle_call(stop, _From, State) ->
     {stop, normal, ok, State};
+handle_call({unhibernate, Room, Host}, _From,
+    #{server_host := ServerHost} = State) ->
+    RMod = gen_mod:ram_db_mod(ServerHost, ?MODULE),
+    {reply, load_room(RMod, Host, ServerHost, Room), State};
+handle_call({create, Room, Host, Opts}, _From,
+	    #{server_host := ServerHost} = State) ->
+    ?DEBUG("MUC: create new room '~ts'~n", [Room]),
+    NewOpts = case Opts of
+		  default -> mod_muc_opt:default_room_options(ServerHost);
+		  _ -> Opts
+	      end,
+    RMod = gen_mod:ram_db_mod(ServerHost, ?MODULE),
+    case start_room(RMod, Host, ServerHost, Room, NewOpts) of
+	{ok, _} ->
+	    ejabberd_hooks:run(create_room, ServerHost, [ServerHost, Room, Host]),
+	    {reply, ok, State};
+	Err ->
+	    {reply, Err, State}
+    end;
 handle_call({create, Room, Host, From, Nick, Opts}, _From,
 	    #{server_host := ServerHost} = State) ->
     ?DEBUG("MUC: create new room '~ts'~n", [Room]),
@@ -437,6 +466,15 @@ handle_info({route, Packet}, #{server_host := ServerHost} = State) ->
 handle_info({room_destroyed, {Room, Host}, Pid}, State) ->
     %% For backward compat
     handle_cast({room_destroyed, {Room, Host}, Pid}, State);
+handle_info({'DOWN', _Ref, process, Pid, _Reason},
+	    #{server_host := ServerHost} = State) ->
+    RMod = gen_mod:ram_db_mod(ServerHost, ?MODULE),
+    case RMod:find_online_room_by_pid(ServerHost, Pid) of
+	{ok, Room, Host} ->
+	    handle_cast({room_destroyed, {Room, Host}, Pid}, State);
+	_ ->
+	    {noreply, State}
+    end;
 handle_info(Info, State) ->
     ?ERROR_MSG("Unexpected info: ~p", [Info]),
     {noreply, State}.
@@ -531,7 +569,8 @@ unhibernate_room(ServerHost, Host, Room) ->
     RMod = gen_mod:ram_db_mod(ServerHost, ?MODULE),
     case RMod:find_online_room(ServerHost, Room, Host) of
 	error ->
-	    case load_room(RMod, Host, ServerHost, Room) of
+	    Proc = procname(ServerHost, {Room, Host}),
+	    case ?GEN_SERVER:call(Proc, {unhibernate, Room, Host}) of
 		{ok, _} = R -> R;
 		_ -> error
 	    end;
@@ -791,25 +830,13 @@ get_rooms(ServerHost, Host) ->
 load_permanent_rooms(Hosts, ServerHost, Opts) ->
     case mod_muc_opt:preload_rooms(Opts) of
 	true ->
-	    Access = get_access(Opts),
-	    HistorySize = mod_muc_opt:history_size(Opts),
-	    QueueType = mod_muc_opt:queue_type(Opts),
-	    RoomShaper = mod_muc_opt:room_shaper(Opts),
-	    RMod = gen_mod:ram_db_mod(Opts, ?MODULE),
 	    lists:foreach(
 		fun(Host) ->
 		    ?DEBUG("Loading rooms at ~ts", [Host]),
 		    lists:foreach(
 			fun(R) ->
 			    {Room, _} = R#muc_room.name_host,
-				case RMod:find_online_room(ServerHost, Room, Host) of
-				    error ->
-					start_room(RMod, Host, ServerHost, Access,
-						   Room, HistorySize, RoomShaper,
-						   R#muc_room.opts, QueueType);
-				    {ok, _} ->
-					ok
-				end
+			    unhibernate_room(ServerHost, Host, Room)
 			end, get_rooms(ServerHost, Host))
 		end, Hosts);
 	false ->
@@ -877,6 +904,7 @@ start_room(Mod, Host, ServerHost, Access, Room,
     case mod_muc_room:start(Host, ServerHost, Access, Room,
 			    HistorySize, RoomShaper, DefOpts, QueueType) of
 	{ok, Pid} ->
+	    erlang:monitor(process, Pid),
 	    Mod:register_online_room(ServerHost, Room, Host, Pid),
 	    {ok, Pid};
 	Err ->
@@ -889,6 +917,7 @@ start_room(Mod, Host, ServerHost, Access, Room, HistorySize,
 			    HistorySize, RoomShaper,
 			    Creator, Nick, DefOpts, QueueType) of
 	{ok, Pid} ->
+	    erlang:monitor(process, Pid),
 	    Mod:register_online_room(ServerHost, Room, Host, Pid),
 	    {ok, Pid};
 	Err ->

src/mod_muc_admin.erl

@@ -653,6 +653,8 @@ create_room_with_opts(Name1, Host1, ServerHost1, CustomRoomOpts) ->
 	{_, _, error} ->
 	    throw({error, "Invalid 'serverhost'"});
 	{Name, Host, ServerHost} ->
+	    case get_room_pid(Name, Host) of
+		room_not_found ->
 		    %% Get the default room options from the muc configuration
 		    DefRoomOpts = mod_muc_opt:default_room_options(ServerHost),
 		    %% Change default room options as required
@@ -660,40 +662,12 @@ create_room_with_opts(Name1, Host1, ServerHost1, CustomRoomOpts) ->
 		    RoomOpts = lists:ukeymerge(1,
 					       lists:keysort(1, FormattedRoomOpts),
 					       lists:keysort(1, DefRoomOpts)),
-
-
-	    %% Get all remaining mod_muc parameters that might be utilized
-	    Access = mod_muc_opt:access(ServerHost),
-	    AcCreate = mod_muc_opt:access_create(ServerHost),
-	    AcAdmin = mod_muc_opt:access_admin(ServerHost),
-	    AcPer = mod_muc_opt:access_persistent(ServerHost),
-	    AcMam = mod_muc_opt:access_mam(ServerHost),
-	    HistorySize = mod_muc_opt:history_size(ServerHost),
-	    RoomShaper = mod_muc_opt:room_shaper(ServerHost),
-	    QueueType = mod_muc_opt:queue_type(ServerHost),
-
-	    %% If the room does not exist yet in the muc_online_room
-	    case get_room_pid(Name, Host) of
-		room_not_found ->
-		    %% Store the room on the server, it is not started yet though at this point
-		    case lists:keyfind(persistent, 1, RoomOpts) of
-			{persistent, true} ->
-			    mod_muc:store_room(ServerHost, Host, Name, RoomOpts);
-			_ ->
-			    ok
-		    end,
-		    %% Start the room
-		    {ok, Pid} = mod_muc_room:start(
-			Host,
-			ServerHost,
-			{Access, AcCreate, AcAdmin, AcPer, AcMam},
-			Name,
-			HistorySize,
-			RoomShaper,
-			RoomOpts,
-			QueueType),
-		    mod_muc:register_online_room(Name, Host, Pid),
+		    case mod_muc:create_room(Host, Name, RoomOpts) of
+			ok ->
 			    ok;
+			{error, _} ->
+			    throw({error, "Unable to start room"})
+		    end;
 		_ ->
 		    throw({error, "Room already exists"})
 	    end

src/mod_muc_mnesia.erl

@@ -33,7 +33,8 @@
 -export([register_online_room/4, unregister_online_room/4, find_online_room/3,
 	 get_online_rooms/3, count_online_rooms/2, rsm_supported/0,
 	 register_online_user/4, unregister_online_user/4,
-	 count_online_rooms_by_user/3, get_online_rooms_by_user/3]).
+	 count_online_rooms_by_user/3, get_online_rooms_by_user/3,
+	 find_online_room_by_pid/2]).
 -export([set_affiliation/6, set_affiliations/4, get_affiliation/5,
 	 get_affiliations/3, search_affiliation/4]).
 %% gen_server callbacks
@@ -181,6 +182,19 @@ find_online_room(Room, Host) ->
 	[#muc_online_room{pid = Pid}] -> {ok, Pid}
     end.
 
+find_online_room_by_pid(_ServerHost, Pid) ->
+    Res =
+    mnesia:dirty_select(
+	muc_online_room,
+	ets:fun2ms(
+	    fun(#muc_online_room{name_host = {Name, Host}, pid = PidS})
+		   when PidS == Pid -> {Name, Host}
+	    end)),
+    case Res of
+	[{Name, Host}] -> {ok, Name, Host};
+	_ -> error
+    end.
+
 count_online_rooms(_ServerHost, Host) ->
     ets:select_count(
       muc_online_room,

src/mod_muc_room.erl

@@ -913,11 +913,9 @@ terminate(Reason, _StateName,
 		    _ ->
 			ok
 		end
-	end,
-	mod_muc:room_destroyed(Host, Room, self(), LServer)
+	end
     catch ?EX_RULE(E, R, St) ->
 	    StackTrace = ?EX_STACK(St),
-	    mod_muc:room_destroyed(Host, Room, self(), LServer),
 	    ?ERROR_MSG("Got exception on room termination:~n** ~ts",
 		       [misc:format_exception(2, E, R, StackTrace)])
     end.

src/mod_muc_sql.erl

@@ -36,7 +36,8 @@
 	 get_online_rooms/3, count_online_rooms/2, rsm_supported/0,
 	 register_online_user/4, unregister_online_user/4,
 	 count_online_rooms_by_user/3, get_online_rooms_by_user/3,
-	 get_subscribed_rooms/3, get_rooms_without_subscribers/2]).
+	 get_subscribed_rooms/3, get_rooms_without_subscribers/2,
+	 find_online_room_by_pid/2]).
 -export([set_affiliation/6, set_affiliations/4, get_affiliation/5,
 	 get_affiliations/3, search_affiliation/4]).
 
@@ -306,6 +307,21 @@ find_online_room(ServerHost, Room, Host) ->
 	    error
     end.
 
+find_online_room_by_pid(ServerHost, Pid) ->
+    PidS = misc:encode_pid(Pid),
+    NodeS = erlang:atom_to_binary(node(Pid), latin1),
+    case ejabberd_sql:sql_query(
+	ServerHost,
+	?SQL("select @(name)s, @(host)s from muc_online_room where "
+	     "node=%(NodeS)s and pid=%(PidS)s")) of
+	{selected, [{Room, Host}]} ->
+	    {ok, Room, Host};
+	{selected, []} ->
+	    error;
+	_Err ->
+	    error
+    end.
+
 count_online_rooms(ServerHost, Host) ->
     case ejabberd_sql:sql_query(
 	   ServerHost,