remove scalar values and Extension struct for local extensions

cmd/kwild/server/utils.go

@@ -31,10 +31,10 @@ import (
 
 // getExtensions returns both the local and remote extensions. Remote extensions are identified by
 // connecting to the specified extension URLs.
-func getExtensions(ctx context.Context, urls []string) (map[string]extensions.ExtensionDriver, error) {
-	exts := make(map[string]extensions.ExtensionDriver)
+func getExtensions(ctx context.Context, urls []string) (map[string]extActions.Extension, error) {
+	exts := make(map[string]extActions.Extension)
 
-	for name, ext := range extActions.GetRegisteredExtensions() {
+	for name, ext := range extActions.RegisteredExtensions() {
 		_, ok := exts[name]
 		if ok {
 			return nil, fmt.Errorf("duplicate extension name: %s", name)
@@ -59,7 +59,7 @@ func getExtensions(ctx context.Context, urls []string) (map[string]extensions.Ex
 	return exts, nil
 }
 
-func adaptExtensions(exts map[string]extensions.ExtensionDriver) map[string]engine.ExtensionInitializer {
+func adaptExtensions(exts map[string]extActions.Extension) map[string]engine.ExtensionInitializer {
 	adapted := make(map[string]engine.ExtensionInitializer, len(exts))
 
 	for name, ext := range exts {

extensions/actions/extension_registry.go

@@ -1,10 +1,19 @@
 package extensions
 
-import "strings"
+import (
+	"context"
+	"strings"
+)
 
-var registeredExtensions = make(map[string]*Extension)
+type Extension interface {
+	Name() string
+	Initialize(ctx context.Context, metadata map[string]string) (map[string]string, error)
+	Execute(ctx context.Context, metadata map[string]string, method string, args ...any) ([]any, error)
+}
+
+var registeredExtensions = make(map[string]Extension)
 
-func RegisterExtension(name string, ext *Extension) error {
+func RegisterExtension(name string, ext Extension) error {
 	name = strings.ToLower(name)
 	if _, ok := registeredExtensions[name]; ok {
 		panic("extension of same name already registered: " + name)
@@ -14,6 +23,6 @@ func RegisterExtension(name string, ext *Extension) error {
 	return nil
 }
 
-func GetRegisteredExtensions() map[string]*Extension {
+func RegisteredExtensions() map[string]Extension {
 	return registeredExtensions
 }