refactor(telemetry): move authn/authz info fns to their own apps

apps/emqx_authn/include/emqx_authn.hrl

@@ -34,6 +34,8 @@
 -define(CONF_NS_ATOM, ?EMQX_AUTHENTICATION_CONFIG_ROOT_NAME_ATOM).
 -define(CONF_NS_BINARY, ?EMQX_AUTHENTICATION_CONFIG_ROOT_NAME_BINARY).
 
+-type authenticator_id() :: binary().
+
 -endif.
 
 -define(RESOURCE_GROUP, <<"emqx_authn">>).

apps/emqx_authn/src/emqx_authn.erl

@@ -20,7 +20,9 @@
     providers/0,
     check_config/1,
     check_config/2,
-    check_configs/1
+    check_configs/1,
+    %% for telemetry information
+    get_enabled_authns/0
 ]).
 
 -include("emqx_authn.hrl").
@@ -77,3 +79,37 @@ atom(Bin) ->
         _:_ ->
             throw({unknown_auth_provider, Bin})
     end.
+
+-spec get_enabled_authns() ->
+    #{
+        authenticators => [authenticator_id()],
+        overridden_listeners => #{authenticator_id() => pos_integer()}
+    }.
+get_enabled_authns() ->
+    %% at the moment of writing, `emqx_authentication:list_chains/0'
+    %% result is always wrapped in `{ok, _}', and it cannot return any
+    %% error values.
+    {ok, Chains} = emqx_authentication:list_chains(),
+    AuthnTypes = lists:usort([
+        Type
+     || #{authenticators := As} <- Chains,
+        #{id := Type} <- As
+    ]),
+    OverriddenListeners =
+        lists:foldl(
+            fun
+                (#{name := ?GLOBAL}, Acc) ->
+                    Acc;
+                (#{authenticators := As}, Acc) ->
+                    lists:foldl(fun tally_authenticators/2, Acc, As)
+            end,
+            #{},
+            Chains
+        ),
+    #{
+        authenticators => AuthnTypes,
+        overridden_listeners => OverriddenListeners
+    }.
+
+tally_authenticators(#{id := AuthenticatorName}, Acc) ->
+    maps:update_with(AuthenticatorName, fun(N) -> N + 1 end, 1, Acc).

apps/emqx_authz/src/emqx_authz.erl

@@ -33,7 +33,9 @@
     lookup/1,
     move/2,
     update/2,
-    authorize/5
+    authorize/5,
+    %% for telemetry information
+    get_enabled_authzs/0
 ]).
 
 -export([post_config_update/5, pre_config_update/3]).
@@ -336,6 +338,9 @@ do_authorize(
         Matched -> {Matched, Type}
     end.
 
+get_enabled_authzs() ->
+    lists:usort([Type || #{type := Type} <- lookup()]).
+
 %%--------------------------------------------------------------------
 %% Internal function
 %%--------------------------------------------------------------------

apps/emqx_authz/test/emqx_authz_SUITE.erl

@@ -57,7 +57,7 @@ end_per_suite(_Config) ->
         }
     ),
     ok = stop_apps([emqx_resource]),
-    emqx_common_test_helpers:stop_apps([emqx_authz, emqx_conf]),
+    emqx_common_test_helpers:stop_apps([emqx_connector, emqx_authz, emqx_conf]),
     meck:unload(emqx_resource),
     ok.
 
@@ -279,5 +279,12 @@ t_move_source(_) ->
 
     ok.
 
+t_get_enabled_authzs_none_enabled(_Config) ->
+    ?assertEqual([], emqx_authz:get_enabled_authzs()).
+
+t_get_enabled_authzs_some_enabled(_Config) ->
+    {ok, _} = emqx_authz:update(?CMD_REPLACE, [?SOURCE4]),
+    ?assertEqual([postgresql], emqx_authz:get_enabled_authzs()).
+
 stop_apps(Apps) ->
     lists:foreach(fun application:stop/1, Apps).

apps/emqx_modules/src/emqx_telemetry.erl

@@ -454,35 +454,17 @@ advanced_mqtt_features() ->
     maps:map(fun(_K, V) -> bool2int(V) end, AdvancedFeatures).
 
 get_authn_authz_info() ->
-    %% at the moment of writing, `emqx_authentication:list_chains/0'
-    %% result is always wrapped in `{ok, _}', and it cannot return any
-    %% error values.
-    {ok, Chains} = emqx_authentication:list_chains(),
-    AuthnTypes = lists:usort([
-        Type
-     || #{authenticators := As} <- Chains,
-        #{id := Type} <- As
-    ]),
-    OverriddenListeners = lists:foldl(
-        fun
-            (#{name := 'mqtt:global'}, Acc) ->
-                Acc;
-            (#{authenticators := As}, Acc) ->
-                lists:foldl(fun tally_authenticators/2, Acc, As)
-        end,
-        #{},
-        Chains
-    ),
-    AuthzTypes = lists:usort([Type || #{type := Type} <- emqx_authz:lookup()]),
+    #{
+        authenticators := AuthnTypes,
+        overridden_listeners := OverriddenListeners
+    } = emqx_authn:get_enabled_authns(),
+    AuthzTypes = emqx_authz:get_enabled_authzs(),
     #{
         authn => AuthnTypes,
         authn_listener => OverriddenListeners,
         authz => AuthzTypes
     }.
 
-tally_authenticators(#{id := AuthenticatorName}, Acc) ->
-    maps:update_with(AuthenticatorName, fun(N) -> N + 1 end, 1, Acc).
-
 bin(L) when is_list(L) ->
     list_to_binary(L);
 bin(A) when is_atom(A) ->