ref(kube): add newBuilder function to dry up builder calls

pkg/kube/client.go

@@ -93,6 +93,15 @@ func (c *Client) Create(namespace string, reader io.Reader) error {
 	return perform(c, namespace, reader, createResource)
 }
 
+func (c *Client) newBuilder(namespace string, reader io.Reader) *resource.Builder {
+	return c.NewBuilder(c.IncludeThirdPartyAPIs).
+		ContinueOnError().
+		NamespaceParam(namespace).
+		DefaultNamespace().
+		Stream(reader, "").
+		Flatten()
+}
+
 // Get gets kubernetes resources as pretty printed string
 //
 // Namespace will set the namespace
@@ -153,32 +162,20 @@ func (c *Client) Get(namespace string, reader io.Reader) (string, error) {
 //
 // Namespace will set the namespaces
 func (c *Client) Update(namespace string, currentReader, targetReader io.Reader) error {
-	current := c.NewBuilder(c.IncludeThirdPartyAPIs).
-		ContinueOnError().
-		NamespaceParam(namespace).
-		DefaultNamespace().
-		Stream(currentReader, "").
-		Flatten().
-		Do()
-
-	target := c.NewBuilder(c.IncludeThirdPartyAPIs).
-		ContinueOnError().
-		NamespaceParam(namespace).
-		DefaultNamespace().
-		Stream(targetReader, "").
-		Flatten().
-		Do()
-
-	currentInfos, err := current.Infos()
+	currentInfos, err := c.newBuilder(namespace, currentReader).Do().Infos()
 	if err != nil {
-		return err
+		return fmt.Errorf("failed decoding reader into objects: %s", err)
+	}
+
+	target := c.newBuilder(namespace, targetReader).Do()
+	if target.Err() != nil {
+		return fmt.Errorf("failed decoding reader into objects: %s", target.Err())
 	}
 
 	targetInfos := []*resource.Info{}
 	updateErrors := []string{}
 
 	err = target.Visit(func(info *resource.Info, err error) error {
-
 		targetInfos = append(targetInfos, info)
 		if err != nil {
 			return err
@@ -194,7 +191,7 @@ func (c *Client) Update(namespace string, currentReader, targetReader io.Reader)
 
 			// Since the resource does not exist, create it.
 			if err := createResource(info); err != nil {
-				return err
+				return fmt.Errorf("failed to create resource: %s", err)
 			}
 
 			kind := info.Mapping.GroupVersionKind.Kind
@@ -219,17 +216,14 @@ func (c *Client) Update(namespace string, currentReader, targetReader io.Reader)
 		return nil
 	})
 
-	deleteUnwantedResources(currentInfos, targetInfos)
-
 	if err != nil {
 		return err
 	} else if len(updateErrors) != 0 {
 		return fmt.Errorf(strings.Join(updateErrors, " && "))
 
 	}
-
+	deleteUnwantedResources(currentInfos, targetInfos)
 	return nil
-
 }
 
 // Delete deletes kubernetes resources from an io.reader
@@ -261,7 +255,6 @@ func skipIfNotFound(err error) error {
 		log.Printf("%v", err)
 		return nil
 	}
-
 	return err
 }
 
@@ -284,36 +277,17 @@ func (c *Client) WatchUntilReady(namespace string, reader io.Reader) error {
 }
 
 func perform(c *Client, namespace string, reader io.Reader, fn ResourceActorFunc) error {
-	r := c.NewBuilder(c.IncludeThirdPartyAPIs).
-		ContinueOnError().
-		NamespaceParam(namespace).
-		DefaultNamespace().
-		Stream(reader, "").
-		Flatten().
-		Do()
-
-	if r.Err() != nil {
-		return r.Err()
+	infos, err := c.newBuilder(namespace, reader).Do().Infos()
+	switch {
+	case err != nil:
+		return err
+	case len(infos) == 0:
+		return fmt.Errorf("no objects visited")
 	}
-
-	count := 0
-	err := r.Visit(func(info *resource.Info, err error) error {
-		if err != nil {
+	for _, info := range infos {
+		if err := fn(info); err != nil {
 			return err
 		}
-		err = fn(info)
-
-		if err == nil {
-			count++
-		}
-		return err
-	})
-
-	if err != nil {
-		return err
-	}
-	if count == 0 {
-		return fmt.Errorf("no objects visited")
 	}
 	return nil
 }