feat: add custom callback for creating connector from bridge V1 config

apps/emqx_bridge/src/emqx_action_info.erl

@@ -28,6 +28,8 @@
     registered_schema_modules/0,
     connector_action_config_to_bridge_v1_config/3,
     has_custom_connector_action_config_to_bridge_v1_config/1,
+    bridge_v1_config_to_connector_config/2,
+    has_custom_bridge_v1_config_to_connector_config/1,
     bridge_v1_config_to_action_config/3,
     has_custom_bridge_v1_config_to_action_config/1,
     transform_bridge_v1_config_to_action_config/4
@@ -41,6 +43,8 @@
 -callback connector_action_config_to_bridge_v1_config(
     ConnectorConfig :: map(), ActionConfig :: map()
 ) -> map().
+%% Define this if the automatic config upgrade is not enough for the connector.
+-callback bridge_v1_config_to_connector_config(BridgeV1Config :: map()) -> map().
 %% Define this if the automatic config upgrade is not enough for the bridge.
 %% If you want to make use of the automatic config upgrade, you can call
 %% emqx_action_info:transform_bridge_v1_config_to_action_config/4 in your
@@ -51,6 +55,7 @@
 -optional_callbacks([
     bridge_v1_type_name/0,
     connector_action_config_to_bridge_v1_config/2,
+    bridge_v1_config_to_connector_config/1,
     bridge_v1_config_to_action_config/2
 ]).
 
@@ -139,6 +144,15 @@ connector_action_config_to_bridge_v1_config(ActionOrBridgeType, ConnectorConfig,
     %% should only be called if defined
     Module:connector_action_config_to_bridge_v1_config(ConnectorConfig, ActionConfig).
 
+has_custom_bridge_v1_config_to_connector_config(ActionOrBridgeType) ->
+    Module = get_action_info_module(ActionOrBridgeType),
+    erlang:function_exported(Module, bridge_v1_config_to_connector_config, 1).
+
+bridge_v1_config_to_connector_config(ActionOrBridgeType, BridgeV1Config) ->
+    Module = get_action_info_module(ActionOrBridgeType),
+    %% should only be called if defined
+    Module:bridge_v1_config_to_connector_config(BridgeV1Config).
+
 has_custom_bridge_v1_config_to_action_config(ActionOrBridgeType) ->
     Module = get_action_info_module(ActionOrBridgeType),
     erlang:function_exported(Module, bridge_v1_config_to_action_config, 2).

apps/emqx_connector/src/schema/emqx_connector_schema.erl

@@ -103,8 +103,17 @@ bridge_configs_to_transform(
 split_bridge_to_connector_and_action(
     {ConnectorsMap, {BridgeType, BridgeName, BridgeV1Conf, ConnectorFields, PreviousRawConfig}}
 ) ->
+    ConnectorMap =
+        case emqx_action_info:has_custom_bridge_v1_config_to_connector_config(BridgeType) of
+            true ->
+                emqx_action_info:bridge_v1_config_to_connector_config(
+                    BridgeType, BridgeV1Conf
+                );
+            false ->
+                %% We do an automatic transfomation to get the connector config
+                %% if the callback is not defined.
                 %% Get connector fields from bridge config
-    ConnectorMap = lists:foldl(
+                lists:foldl(
                     fun({ConnectorFieldName, _Spec}, ToTransformSoFar) ->
                         case maps:is_key(to_bin(ConnectorFieldName), BridgeV1Conf) of
                             true ->
@@ -120,7 +129,8 @@ split_bridge_to_connector_and_action(
                     end,
                     #{},
                     ConnectorFields
-    ),
+                )
+        end,
     %% Generate a connector name, if needed.  Avoid doing so if there was a previous config.
     ConnectorName =
         case PreviousRawConfig of