fix(builder): initializes rest config before invoking any partial bui…

…lder (red-hat-data-services#792)

This way we can obtain interact with the cluster from partial builders instead of defering it to Apply phase.

pkg/feature/builder.go

@@ -18,6 +18,7 @@ type partialBuilder func(f *Feature) error
 
 type featureBuilder struct {
 	name     string
+	config   *rest.Config
 	builders []partialBuilder
 }
 
@@ -43,8 +44,7 @@ func (fb *featureBuilder) For(spec *v1.DSCInitializationSpec) *featureBuilder {
 }
 
 func (fb *featureBuilder) UsingConfig(config *rest.Config) *featureBuilder {
-	fb.builders = append(fb.builders, createClients(config))
-
+	fb.config = config
 	return fb
 }
 
@@ -150,32 +150,20 @@ func (fb *featureBuilder) Load() (*Feature, error) {
 		Enabled: true,
 	}
 
-	for i := range fb.builders {
-		if err := fb.builders[i](feature); err != nil {
-			return nil, err
-		}
-	}
-
 	// UsingConfig builder wasn't called while constructing this feature.
 	// Get default settings and create needed clients.
-	if feature.Client == nil {
-		restCfg, err := config.GetConfig()
-		if errors.Is(err, rest.ErrNotInCluster) {
-			// rollback to local kubeconfig - this can be helpful when running the process locally i.e. while debugging
-			kubeconfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
-				&clientcmd.ClientConfigLoadingRules{ExplicitPath: clientcmd.RecommendedHomeFile},
-				&clientcmd.ConfigOverrides{},
-			)
-
-			restCfg, err = kubeconfig.ClientConfig()
-			if err != nil {
-				return nil, err
-			}
-		} else if err != nil {
+	if fb.config == nil {
+		if err := fb.withDefaultClient(); err != nil {
 			return nil, err
 		}
+	}
+
+	if err := createClients(fb.config)(feature); err != nil {
+		return nil, err
+	}
 
-		if err := createClients(restCfg)(feature); err != nil {
+	for i := range fb.builders {
+		if err := fb.builders[i](feature); err != nil {
 			return nil, err
 		}
 	}
@@ -188,3 +176,24 @@ func (fb *featureBuilder) Load() (*Feature, error) {
 
 	return feature, nil
 }
+
+func (fb *featureBuilder) withDefaultClient() error {
+	restCfg, err := config.GetConfig()
+	if errors.Is(err, rest.ErrNotInCluster) {
+		// rollback to local kubeconfig - this can be helpful when running the process locally i.e. while debugging
+		kubeconfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
+			&clientcmd.ClientConfigLoadingRules{ExplicitPath: clientcmd.RecommendedHomeFile},
+			&clientcmd.ConfigOverrides{},
+		)
+
+		restCfg, err = kubeconfig.ClientConfig()
+		if err != nil {
+			return err
+		}
+	} else if err != nil {
+		return err
+	}
+
+	fb.config = restCfg
+	return nil
+}