feat: add comment for public method and function

Signed-off-by: hlts2 <hiroto.funakoshi.hiroto@gmail.com>

Author: hlts2

pkg/driver/hooks/hooks.go

@@ -10,9 +10,10 @@ import (
 	"k8s.io/client-go/tools/clientcmd"
 )
 
+// Hook defines the lifecycle methods for a hook, such as PreStop, PostStart, and PostStop.
+// Implementations of this interface can define actions to be performed at different lifecycle stages.
 type Hook interface {
 	PreStop(ctx context.Context) error
-	// PostStop, ...
 }
 
 type hook struct {
@@ -21,12 +22,12 @@ type hook struct {
 	clientCfgPath string
 }
 
+// NewHook creates a new Hook with the provided options. It returns an error if setup fails.
 func NewHook(opts ...Option) (Hook, error) {
 	h := &hook{}
 	for _, opt := range append(defaultOpts, opts...) {
 		opt(h)
 	}
-
 	if h.nodeName == "" {
 		return nil, errors.New("node name not found")
 	}

pkg/driver/hooks/options.go

@@ -6,6 +6,7 @@ import (
 	"k8s.io/client-go/kubernetes"
 )
 
+// Option represents a configuration function that modifies hook object.
 type Option func(*hook)
 
 var defaultOpts = []Option{
@@ -21,6 +22,7 @@ func WithKubernetesClient(client kubernetes.Interface) Option {
 	}
 }
 
+// WithKubernetesClient returns Option to set Kubernetes config path.
 func WithKubernetesClientConfigPath(path string) Option {
 	return func(h *hook) {
 		if path != "" {
@@ -29,7 +31,7 @@ func WithKubernetesClientConfigPath(path string) Option {
 	}
 }
 
-// WithNodeName returns Option to set node node name.
+// WithNodeName returns Option to set node name.
 func WithNodeName(name string) Option {
 	return func(h *hook) {
 		if name != "" {

pkg/driver/hooks/prestop.go

@@ -19,6 +19,11 @@ var drainTaints = map[string]struct{}{
 	v1.TaintNodeUnschedulable: {}, // Kubernetes common eviction taint (kubectl drain)
 }
 
+// PreStop handles the PreStop lifecycle event. It retrieves the node information
+// from the Kubernetes API and checks if the node is being drained. If the node is not
+// being drained, it skips the VolumeAttachment cleanup check. If the node is being drained,
+// it waits for the cleanup of VolumeAttachments. If any errors occur during this process,
+// they are logged and returned.
 func (h *hook) PreStop(ctx context.Context) error {
 	node, err := h.client.CoreV1().Nodes().Get(ctx, h.nodeName, metav1.GetOptions{})
 	if err != nil {
@@ -49,7 +54,6 @@ func (h *hook) PreStop(ctx context.Context) error {
 	log.Info().
 		Str("node_name", h.nodeName).
 		Msg("Finished waiting for VolumeAttachments cleanup")
-
 	return nil
 }