refactor: address review comments and avoid transformations without schema knowledge

apps/emqx_bridge/src/emqx_action_info.erl

@@ -35,9 +35,9 @@
 -callback connector_type_name() -> atom().
 -callback schema_module() -> atom().
 %% Define this if the automatic config downgrade is not enough for the bridge.
--callback action_to_bridge_v1_fixup(map()) -> term().
+-callback action_to_bridge_v1_fixup(map()) -> map().
 %% Define this if the automatic config upgrade is not enough for the bridge.
--callback bridge_v1_to_action_fixup(map()) -> term().
+-callback bridge_v1_to_action_fixup(map()) -> map().
 
 -optional_callbacks([
     bridge_v1_type_name/0,
@@ -130,15 +130,38 @@ action_to_bridge_v1_fixup(ActionOrBridgeType, Config) ->
             Config
     end.
 
-bridge_v1_to_action_fixup(ActionOrBridgeType, Config) ->
+bridge_v1_to_action_fixup(ActionOrBridgeType, Config0) ->
     Module = get_action_info_module(ActionOrBridgeType),
     case erlang:function_exported(Module, bridge_v1_to_action_fixup, 1) of
         true ->
-            Module:bridge_v1_to_action_fixup(Config);
+            Config1 = Module:bridge_v1_to_action_fixup(Config0),
+            common_bridge_v1_to_action_adapter(Config1);
         false ->
-            Config
+            common_bridge_v1_to_action_adapter(Config0)
     end.
 
+%% ====================================================================
+%% Helper fns
+%% ====================================================================
+
+common_bridge_v1_to_action_adapter(RawConfig) ->
+    TopKeys = [
+        <<"enable">>,
+        <<"connector">>,
+        <<"local_topic">>,
+        <<"resource_opts">>,
+        <<"description">>,
+        <<"parameters">>
+    ],
+    TopMap = maps:with(TopKeys, RawConfig),
+    RestMap = maps:without(TopKeys, RawConfig),
+    %% Other parameters should be stuffed into `parameters'
+    emqx_utils_maps:update_if_present(
+        <<"parameters">>,
+        fun(Old) -> emqx_utils_maps:deep_merge(Old, RestMap) end,
+        TopMap
+    ).
+
 %% ====================================================================
 %% Internal functions for building the info map and accessing it
 %% ====================================================================
@@ -146,7 +169,7 @@ bridge_v1_to_action_fixup(ActionOrBridgeType, Config) ->
 get_action_info_module(ActionOrBridgeType) ->
     InfoMap = info_map(),
     ActionInfoModuleMap = maps:get(action_type_to_info_module, InfoMap),
-    maps:get(ActionOrBridgeType, ActionInfoModuleMap).
+    maps:get(ActionOrBridgeType, ActionInfoModuleMap, undefined).
 
 internal_emqx_action_persistent_term_info_key() ->
     ?FUNCTION_NAME.

apps/emqx_bridge/src/schema/emqx_bridge_v2_schema.erl

@@ -40,7 +40,7 @@
 
 -export([types/0, types_sc/0]).
 
--export([make_action_schema/1]).
+-export([make_producer_action_schema/1, make_consumer_action_schema/1]).
 
 -export_type([action_type/0]).
 
@@ -158,7 +158,13 @@ examples(Method) ->
 %% Helper functions for making HOCON Schema
 %%======================================================================================
 
-make_action_schema(ActionParametersRef) ->
+make_producer_action_schema(ActionParametersRef) ->
+    [
+        {local_topic, mk(binary(), #{required => false, desc => ?DESC(mqtt_topic)})}
+        | make_consumer_action_schema(ActionParametersRef)
+    ].
+
+make_consumer_action_schema(ActionParametersRef) ->
     [
         {enable, mk(boolean(), #{desc => ?DESC("config_enable"), default => true})},
         {connector,
@@ -166,7 +172,6 @@ make_action_schema(ActionParametersRef) ->
                 desc => ?DESC(emqx_connector_schema, "connector_field"), required => true
             })},
         {description, emqx_schema:description_schema()},
-        {local_topic, mk(binary(), #{required => false, desc => ?DESC(mqtt_topic)})},
         {parameters, ActionParametersRef},
         {resource_opts,
             mk(ref(?MODULE, resource_opts), #{default => #{}, desc => ?DESC(resource_opts)})}

apps/emqx_bridge/test/emqx_bridge_v1_compatibility_layer_SUITE.erl

@@ -60,15 +60,7 @@ init_per_testcase(_TestCase, Config) ->
     ets:new(fun_table_name(), [named_table, public]),
     %% Create a fake connector
     {ok, _} = emqx_connector:create(con_type(), con_name(), con_config()),
-    [
-        {mocked_mods, [
-            emqx_connector_schema,
-            emqx_connector_resource,
-
-            emqx_bridge_v2
-        ]}
-        | Config
-    ].
+    Config.
 
 end_per_testcase(_TestCase, _Config) ->
     ets:delete(fun_table_name()),

apps/emqx_bridge_azure_event_hub/src/emqx_bridge_azure_event_hub_action_info.erl

@@ -24,17 +24,7 @@ connector_type_name() -> azure_event_hub_producer.
 schema_module() -> emqx_bridge_azure_event_hub.
 
 action_to_bridge_v1_fixup(Config) ->
-    rename(<<"parameters">>, <<"kafka">>, Config).
-
-rename(OldKey, NewKey, Map) ->
-    case maps:find(OldKey, Map) of
-        {ok, Value} ->
-            maps:remove(OldKey, maps:put(NewKey, Value, Map));
-        error ->
-            Map
-    end.
+    emqx_bridge_kafka_action_info:action_to_bridge_v1_fixup(Config).
 
 bridge_v1_to_action_fixup(Config) ->
-    KafkaField = emqx_utils_maps:deep_get([<<"parameters">>, <<"kafka">>], Config, #{}),
-    Config1 = emqx_utils_maps:deep_remove([<<"parameters">>, <<"kafka">>], Config),
-    emqx_utils_maps:deep_merge(Config1, #{<<"parameters">> => KafkaField}).
+    emqx_bridge_kafka_action_info:bridge_v1_to_action_fixup(Config).

apps/emqx_bridge_kafka/src/emqx_bridge_kafka_action_info.erl

@@ -24,17 +24,22 @@ connector_type_name() -> kafka_producer.
 schema_module() -> emqx_bridge_kafka.
 
 action_to_bridge_v1_fixup(Config) ->
-    rename(<<"parameters">>, <<"kafka">>, Config).
+    emqx_utils_maps:rename(<<"parameters">>, <<"kafka">>, Config).
 
-rename(OldKey, NewKey, Map) ->
-    case maps:find(OldKey, Map) of
-        {ok, Value} ->
-            maps:remove(OldKey, maps:put(NewKey, Value, Map));
-        error ->
-            Map
-    end.
+bridge_v1_to_action_fixup(Config0) ->
+    Config = emqx_utils_maps:rename(<<"kafka">>, <<"parameters">>, Config0),
+    maps:with(producer_action_field_keys(), Config).
 
-bridge_v1_to_action_fixup(Config) ->
-    KafkaField = emqx_utils_maps:deep_get([<<"parameters">>, <<"kafka">>], Config, #{}),
-    Config1 = emqx_utils_maps:deep_remove([<<"parameters">>, <<"kafka">>], Config),
-    emqx_utils_maps:deep_merge(Config1, #{<<"parameters">> => KafkaField}).
+%%------------------------------------------------------------------------------------------
+%% Internal helper fns
+%%------------------------------------------------------------------------------------------
+
+producer_action_field_keys() ->
+    [
+        to_bin(K)
+     || {K, _} <- emqx_bridge_kafka:fields(kafka_producer_action)
+    ].
+
+to_bin(B) when is_binary(B) -> B;
+to_bin(L) when is_list(L) -> list_to_binary(L);
+to_bin(A) when is_atom(A) -> atom_to_binary(A, utf8).

apps/emqx_connector/src/schema/emqx_connector_schema.erl

@@ -98,16 +98,16 @@ bridge_configs_to_transform(
     end.
 
 split_bridge_to_connector_and_action(
-    {ConnectorsMap, {BridgeType, BridgeName, BridgeConf, ConnectorFields, PreviousRawConfig}}
+    {ConnectorsMap, {BridgeType, BridgeName, ActionConf, ConnectorFields, PreviousRawConfig}}
 ) ->
     %% Get connector fields from bridge config
     ConnectorMap = lists:foldl(
         fun({ConnectorFieldName, _Spec}, ToTransformSoFar) ->
-            case maps:is_key(to_bin(ConnectorFieldName), BridgeConf) of
+            case maps:is_key(to_bin(ConnectorFieldName), ActionConf) of
                 true ->
                     NewToTransform = maps:put(
                         to_bin(ConnectorFieldName),
-                        maps:get(to_bin(ConnectorFieldName), BridgeConf),
+                        maps:get(to_bin(ConnectorFieldName), ActionConf),
                         ToTransformSoFar
                     ),
                     NewToTransform;
@@ -118,23 +118,6 @@ split_bridge_to_connector_and_action(
         #{},
         ConnectorFields
     ),
-    %% Remove connector fields from bridge config to create Action
-    ActionMap0 = lists:foldl(
-        fun
-            ({enable, _Spec}, ToTransformSoFar) ->
-                %% Enable filed is used in both
-                ToTransformSoFar;
-            ({ConnectorFieldName, _Spec}, ToTransformSoFar) ->
-                case maps:is_key(to_bin(ConnectorFieldName), BridgeConf) of
-                    true ->
-                        maps:remove(to_bin(ConnectorFieldName), ToTransformSoFar);
-                    false ->
-                        ToTransformSoFar
-                end
-        end,
-        BridgeConf,
-        ConnectorFields
-    ),
     %% Generate a connector name, if needed.  Avoid doing so if there was a previous config.
     ConnectorName =
         case PreviousRawConfig of
@@ -142,7 +125,7 @@ split_bridge_to_connector_and_action(
             _ -> generate_connector_name(ConnectorsMap, BridgeName, 0)
         end,
     %% Add connector field to action map
-    ActionMap = maps:put(<<"connector">>, ConnectorName, ActionMap0),
+    ActionMap = maps:put(<<"connector">>, ConnectorName, ActionConf),
     {BridgeType, BridgeName, ActionMap, ConnectorName, ConnectorMap}.
 
 generate_connector_name(ConnectorsMap, BridgeName, Attempt) ->
@@ -191,7 +174,7 @@ transform_old_style_bridges_to_connector_and_actions_of_type(
     ),
     %% Add connectors and actions and remove bridges
     lists:foldl(
-        fun({BridgeType, BridgeName, ActionMap, ConnectorName, ConnectorMap}, RawConfigSoFar) ->
+        fun({BridgeType, BridgeName, ActionMap0, ConnectorName, ConnectorMap}, RawConfigSoFar) ->
             %% Add connector
             RawConfigSoFar1 = emqx_utils_maps:deep_put(
                 [<<"connectors">>, to_bin(ConnectorType), ConnectorName],
@@ -203,21 +186,12 @@ transform_old_style_bridges_to_connector_and_actions_of_type(
                 [<<"bridges">>, to_bin(BridgeType), BridgeName],
                 RawConfigSoFar1
             ),
-            %% Take fields that should be in the top level of the action map
-            TopLevelFields = [<<"resource_opts">>, <<"enable">>, <<"connector">>],
-            TopLevelActionFields = maps:with(TopLevelFields, ActionMap),
-            ParametersActionFields = maps:without(TopLevelFields, ActionMap),
-            %% Action map should be wrapped under parameters key
-            WrappedParameters = #{<<"parameters">> => ParametersActionFields},
-            FinalActionMap = maps:merge(TopLevelActionFields, WrappedParameters),
-            FixedActionMap = emqx_action_info:bridge_v1_to_action_fixup(
-                BridgeType, FinalActionMap
-            ),
+            ActionMap = emqx_action_info:bridge_v1_to_action_fixup(BridgeType, ActionMap0),
             %% Add action
             RawConfigSoFar3 = emqx_utils_maps:deep_put(
                 [actions_config_name(), to_bin(maybe_rename(BridgeType)), BridgeName],
                 RawConfigSoFar2,
-                FixedActionMap
+                ActionMap
             ),
             RawConfigSoFar3
         end,

apps/emqx_utils/src/emqx_utils_maps.erl

@@ -34,7 +34,8 @@
     best_effort_recursive_sum/3,
     if_only_to_toggle_enable/2,
     update_if_present/3,
-    put_if/4
+    put_if/4,
+    rename/3
 ]).
 
 -export_type([config_key/0, config_key_path/0]).
@@ -309,3 +310,11 @@ put_if(Acc, K, V, true) ->
     Acc#{K => V};
 put_if(Acc, _K, _V, false) ->
     Acc.
+
+rename(OldKey, NewKey, Map) ->
+    case maps:find(OldKey, Map) of
+        {ok, Value} ->
+            maps:put(NewKey, Value, maps:remove(OldKey, Map));
+        error ->
+            Map
+    end.