Extract several packages to form a public API

framework/config/module/interfaces.go

@@ -0,0 +1,60 @@
+package modconfig
+
+import (
+	"github.com/foxcpp/maddy/framework/config"
+	"github.com/foxcpp/maddy/framework/module"
+)
+
+func MessageCheck(globals map[string]interface{}, args []string, block config.Node) (module.Check, error) {
+	var check module.Check
+	if err := ModuleFromNode("check", args, block, globals, &check); err != nil {
+		return nil, err
+	}
+	return check, nil
+}
+
+// deliveryDirective is a callback for use in config.Map.Custom.
+//
+// It does all work necessary to create a module instance from the config
+// directive with the following structure:
+// directive_name mod_name [inst_name] [{
+//   inline_mod_config
+// }]
+//
+// Note that if used configuration structure lacks directive_name before mod_name - this function
+// should not be used (call DeliveryTarget directly).
+func DeliveryDirective(m *config.Map, node config.Node) (interface{}, error) {
+	return DeliveryTarget(m.Globals, node.Args, node)
+}
+
+func DeliveryTarget(globals map[string]interface{}, args []string, block config.Node) (module.DeliveryTarget, error) {
+	var target module.DeliveryTarget
+	if err := ModuleFromNode("target", args, block, globals, &target); err != nil {
+		return nil, err
+	}
+	return target, nil
+}
+
+func MsgModifier(globals map[string]interface{}, args []string, block config.Node) (module.Modifier, error) {
+	var check module.Modifier
+	if err := ModuleFromNode("modify", args, block, globals, &check); err != nil {
+		return nil, err
+	}
+	return check, nil
+}
+
+func StorageDirective(m *config.Map, node config.Node) (interface{}, error) {
+	var backend module.Storage
+	if err := ModuleFromNode("storage", node.Args, node, m.Globals, &backend); err != nil {
+		return nil, err
+	}
+	return backend, nil
+}
+
+func TableDirective(m *config.Map, node config.Node) (interface{}, error) {
+	var tbl module.Table
+	if err := ModuleFromNode("table", node.Args, node, m.Globals, &tbl); err != nil {
+		return nil, err
+	}
+	return tbl, nil
+}