Add function for getting room diagnostics

src/mod_muc_admin.erl

@@ -45,7 +45,7 @@
 	 get_room_serverhost/1,
 	 web_page_host/3,
 	 mod_opt_type/1, mod_options/1,
-         get_commands_spec/0, find_hosts/1]).
+	 get_commands_spec/0, find_hosts/1, room_diagnostics/2]).
 
 -include("logger.hrl").
 -include_lib("xmpp/include/xmpp.hrl").
@@ -1184,6 +1184,28 @@ get_room_pid(Name, Service) ->
 	    invalid_service
     end.
 
+room_diagnostics(Name, Service) ->
+    try get_room_serverhost(Service) of
+	ServerHost ->
+	    RMod = gen_mod:ram_db_mod(ServerHost, mod_muc),
+	    case RMod:find_online_room(ServerHost, Name, Service) of
+		error ->
+		    room_hibernated;
+		{ok, Pid} ->
+		    case rpc:pinfo(Pid, [current_stacktrace, message_queue_len, messages]) of
+			[{_, R}, {_, QL}, {_, Q}] ->
+			    #{stacktrace => R, queue_size => QL, queue => lists:sublist(Q, 10)};
+			_ ->
+			    unable_to_probe_process
+		    end
+	    end
+    catch
+	error:{invalid_domain, _} ->
+	    invalid_service;
+	error:{unregistered_route, _} ->
+	    invalid_service
+    end.
+
 %% It is required to put explicitly all the options because
 %% the record elements are replaced at compile time.
 %% So, this can't be parametrized.