chore: little change avoid atom leak

apps/emqx/src/emqx_shared_sub.erl

@@ -158,20 +158,18 @@ dispatch(Group, Topic, Delivery = #delivery{message = Msg}, FailedSubs) ->
 
 -spec strategy(emqx_topic:group()) -> strategy().
 strategy(Group) ->
-    case
-        emqx:get_config(
-            [
-                broker,
-                shared_subscription_group,
-                %%binary_to_existing_atom(Group, utf8),
-                binary_to_atom(Group),
-                strategy
-            ],
-            undefined
-        )
-    of
-        undefined -> emqx:get_config([broker, shared_subscription_strategy]);
-        Strategy -> Strategy
+    try
+        emqx:get_config([
+            broker,
+            shared_subscription_group,
+            binary_to_existing_atom(Group),
+            strategy
+        ])
+    catch
+        error:{config_not_found, _} ->
+            get_default_shared_subscription_strategy();
+        error:badarg ->
+            get_default_shared_subscription_strategy()
     end.
 
 -spec ack_enabled() -> boolean().
@@ -555,3 +553,6 @@ delete_route_if_needed({Group, Topic} = GroupTopic) ->
     if_no_more_subscribers(GroupTopic, fun() ->
         ok = emqx_router:do_delete_route(Topic, {Group, node()})
     end).
+
+get_default_shared_subscription_strategy() ->
+    emqx:get_config([broker, shared_subscription_strategy]).

apps/emqx_authn/src/emqx_authn_api.erl

@@ -794,8 +794,8 @@ find_authenticator_config(AuthenticatorID, ConfKeyPath) ->
 with_listener(ListenerID, Fun) ->
     case find_listener(ListenerID) of
         {ok, {BType, BName}} ->
-            Type = binary_to_existing_atom(BType, utf8),
-            Name = binary_to_existing_atom(BName, utf8),
+            Type = binary_to_existing_atom(BType),
+            Name = binary_to_existing_atom(BName),
             ChainName = binary_to_atom(ListenerID),
             Fun(Type, Name, ChainName);
         {error, Reason} ->

apps/emqx_bridge/src/emqx_bridge_api.erl

@@ -687,11 +687,15 @@ get_metrics_from_local_node(BridgeType, BridgeName) ->
     ).
 
 is_enabled_bridge(BridgeType, BridgeName) ->
-    try emqx:get_config([bridges, BridgeType, binary_to_atom(BridgeName)]) of
+    try emqx:get_config([bridges, BridgeType, binary_to_existing_atom(BridgeName)]) of
         ConfMap ->
             maps:get(enable, ConfMap, false)
     catch
         error:{config_not_found, _} ->
+            throw(not_found);
+        error:badarg ->
+            %% catch non-existing atom,
+            %% none-existing atom means it is not available in config PT storage.
             throw(not_found)
     end.