fix(limiter): a bucket with an infinity rate shouldn't be added to limiter server

apps/emqx/src/emqx_limiter/src/emqx_limiter_schema.erl

@@ -36,6 +36,7 @@
     calc_capacity/1,
     extract_with_type/2,
     default_client_config/0,
+    default_bucket_config/0,
     short_paths_fields/1,
     get_listener_opts/1,
     get_node_opts/1,

apps/emqx/src/emqx_limiter/src/emqx_limiter_server.erl

@@ -131,6 +131,9 @@ connect(Id, Type, Cfg) ->
 -spec add_bucket(limiter_id(), limiter_type(), hocons:config() | undefined) -> ok.
 add_bucket(_Id, _Type, undefined) ->
     ok;
+%% a bucket with an infinity rate shouldn't be added to this server, because it is always full
+add_bucket(_Id, _Type, #{rate := infinity}) ->
+    ok;
 add_bucket(Id, Type, Cfg) ->
     ?CALL(Type, {add_bucket, Id, Cfg}).
 
@@ -507,8 +510,6 @@ make_root(#{rate := Rate, burst := Burst}) ->
         correction => 0
     }.
 
-do_add_bucket(_Id, #{rate := infinity}, #{root := #{rate := infinity}} = State) ->
-    State;
 do_add_bucket(Id, #{rate := Rate} = Cfg, #{buckets := Buckets} = State) ->
     case maps:get(Id, Buckets, undefined) of
         undefined ->

apps/emqx/test/emqx_ratelimiter_SUITE.erl

@@ -617,6 +617,24 @@ t_extract_with_type(_) ->
         )
     ).
 
+t_add_bucket(_) ->
+    Checker = fun(Size) ->
+        #{buckets := Buckets} = sys:get_state(emqx_limiter_server:whereis(bytes)),
+        ?assertEqual(Size, maps:size(Buckets), Buckets)
+    end,
+    DefBucket = emqx_limiter_schema:default_bucket_config(),
+    ?assertEqual(ok, emqx_limiter_server:add_bucket(?FUNCTION_NAME, bytes, undefined)),
+    Checker(0),
+    ?assertEqual(ok, emqx_limiter_server:add_bucket(?FUNCTION_NAME, bytes, DefBucket)),
+    Checker(0),
+    ?assertEqual(
+        ok, emqx_limiter_server:add_bucket(?FUNCTION_NAME, bytes, DefBucket#{rate := 100})
+    ),
+    Checker(1),
+    ?assertEqual(ok, emqx_limiter_server:del_bucket(?FUNCTION_NAME, bytes)),
+    Checker(0),
+    ok.
+
 %%--------------------------------------------------------------------
 %% Test Cases  Create Instance
 %%--------------------------------------------------------------------