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refactor: rename Helper to Client

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The name helper isn't very good. This renames it to Client. A new func
was also added, NewForConfig, that will allow for the creation of the helper
client from an arbitrary Kubernetes REST config.

Signed-off-by: Andrew Rynhard <andrew@andrewrynhard.com>
This commit is contained in:
Andrew Rynhard
2019-11-05 03:10:42 +00:00
parent c9732458c1
commit 03a09c2294
3 changed files with 32 additions and 20 deletions
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4
internal/app/machined/internal/phase/kubernetes/cordon_and_drain.go
View File

@@ -35,9 +35,9 @@ func (task *CordonAndDrain) standard() (err error) {
return err
}
var kubeHelper *kubernetes.Helper
var kubeHelper *kubernetes.Client
if kubeHelper, err = kubernetes.NewHelper(); err != nil {
if kubeHelper, err = kubernetes.NewClientFromKubeletKubeconfig(); err != nil {
return err
}

2
internal/app/machined/pkg/system/services/apid.go
View File

@@ -77,7 +77,7 @@ func (o *APID) Runner(config runtime.Configurator) (runner.Runner, error) {
opts := []retry.Option{retry.WithUnits(3 * time.Second), retry.WithJitter(time.Second)}
err := retry.Constant(10*time.Minute, opts...).Retry(func() error {
h, err := kubernetes.NewHelper()
h, err := kubernetes.NewClientFromKubeletKubeconfig()
if err != nil {
return retry.ExpectedError(fmt.Errorf("failed to create client: %w", err))
}

46
pkg/kubernetes/kubernetes.go
View File

@@ -31,14 +31,14 @@ import (
"github.com/talos-systems/talos/pkg/retry"
)
// Helper represents a set of helper methods for interacting with the
// Client represents a set of helper methods for interacting with the
// Kubernetes API.
type Helper struct {
type Client struct {
client *kubernetes.Clientset
}
// NewHelper initializes and returns a Helper.
func NewHelper() (helper *Helper, err error) {
// NewClientFromKubeletKubeconfig initializes and returns a Client.
func NewClientFromKubeletKubeconfig() (client *Client, err error) {
var config *restclient.Config
config, err = clientcmd.BuildConfigFromFlags("", constants.KubeletKubeconfig)
@@ -53,11 +53,23 @@ func NewHelper() (helper *Helper, err error) {
return nil, err
}
return &Helper{clientset}, nil
return &Client{clientset}, nil
}
// NewClientFromPKI initializes and returns a Helper.
func NewClientFromPKI(ca, crt, key []byte, host, port string) (helper *Helper, err error) {
// NewForConfig initializes and returns a client using the provided config.
func NewForConfig(config *restclient.Config) (client *Client, err error) {
var clientset *kubernetes.Clientset
clientset, err = kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &Client{clientset}, nil
}
// NewClientFromPKI initializes and returns a Client.
func NewClientFromPKI(ca, crt, key []byte, host, port string) (client *Client, err error) {
tlsClientConfig := restclient.TLSClientConfig{
CAData: ca,
CertData: crt,
@@ -76,12 +88,12 @@ func NewClientFromPKI(ca, crt, key []byte, host, port string) (helper *Helper, e
return nil, err
}
return &Helper{clientset}, nil
return &Client{clientset}, nil
}
// NewTemporaryClientFromPKI initializes a Kubernetes client using a certificate
// with a TTL of 10 minutes.
func NewTemporaryClientFromPKI(caCrt, caKey []byte, endpoint, port string) (helper *Helper, err error) {
func NewTemporaryClientFromPKI(caCrt, caKey []byte, endpoint, port string) (client *Client, err error) {
opts := []x509.Option{
x509.RSA(true),
x509.CommonName("admin"),
@@ -123,7 +135,7 @@ func NewTemporaryClientFromPKI(caCrt, caKey []byte, endpoint, port string) (help
}
// MasterIPs cordons and drains a node in one call.
func (h *Helper) MasterIPs() (addrs []string, err error) {
func (h *Client) MasterIPs() (addrs []string, err error) {
endpoints, err := h.client.CoreV1().Endpoints("default").Get("kubernetes", metav1.GetOptions{})
if err != nil {
return nil, err
@@ -141,7 +153,7 @@ func (h *Helper) MasterIPs() (addrs []string, err error) {
}
// LabelNodeAsMaster labels a node with the required master label.
func (h *Helper) LabelNodeAsMaster(name string) (err error) {
func (h *Client) LabelNodeAsMaster(name string) (err error) {
n, err := h.client.CoreV1().Nodes().Get(name, metav1.GetOptions{})
if err != nil {
return err
@@ -182,7 +194,7 @@ func (h *Helper) LabelNodeAsMaster(name string) (err error) {
}
// CordonAndDrain cordons and drains a node in one call.
func (h *Helper) CordonAndDrain(node string) (err error) {
func (h *Client) CordonAndDrain(node string) (err error) {
if err = h.Cordon(node); err != nil {
return err
}
@@ -191,7 +203,7 @@ func (h *Helper) CordonAndDrain(node string) (err error) {
}
// Cordon marks a node as unschedulable.
func (h *Helper) Cordon(name string) error {
func (h *Client) Cordon(name string) error {
node, err := h.client.CoreV1().Nodes().Get(name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("failed to get node %s: %w", name, err)
@@ -211,7 +223,7 @@ func (h *Helper) Cordon(name string) error {
}
// Uncordon marks a node as schedulable.
func (h *Helper) Uncordon(name string) error {
func (h *Client) Uncordon(name string) error {
node, err := h.client.CoreV1().Nodes().Get(name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("failed to get node %s: %w", name, err)
@@ -228,7 +240,7 @@ func (h *Helper) Uncordon(name string) error {
}
// Drain evicts all pods on a given node.
func (h *Helper) Drain(node string) error {
func (h *Client) Drain(node string) error {
opts := metav1.ListOptions{
FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": node}).String(),
}
@@ -264,7 +276,7 @@ func (h *Helper) Drain(node string) error {
return nil
}
func (h *Helper) evict(p corev1.Pod, gracePeriod int64) error {
func (h *Client) evict(p corev1.Pod, gracePeriod int64) error {
for {
pol := &policy.Eviction{
ObjectMeta: metav1.ObjectMeta{Namespace: p.GetNamespace(), Name: p.GetName()},
@@ -287,7 +299,7 @@ func (h *Helper) evict(p corev1.Pod, gracePeriod int64) error {
}
}
func (h *Helper) waitForPodDeleted(p *corev1.Pod) error {
func (h *Client) waitForPodDeleted(p *corev1.Pod) error {
return retry.Constant(time.Minute, retry.WithUnits(3*time.Second)).Retry(func() error {
pod, err := h.client.CoreV1().Pods(p.GetNamespace()).Get(p.GetName(), metav1.GetOptions{})
switch {