/
admissionregistration.go
145 lines (118 loc) · 2.99 KB
/
admissionregistration.go
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package admissionregistration
import (
"fmt"
"os"
"sync"
apiadmissionsclient "k8s.io/client-go/kubernetes/typed/admissionregistration/v1beta1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
var (
instance Ops
once sync.Once
)
// Ops is an interface to the admission client wrapper.
type Ops interface {
MutatingWebhookConfigurationOps
// SetConfig sets the config and resets the client.
SetConfig(config *rest.Config)
}
// Instance returns a singleton instance of the client.
func Instance() Ops {
once.Do(func() {
if instance == nil {
instance = &Client{}
}
})
return instance
}
// SetInstance replaces the instance with the provided one. Should be used only for testing purposes.
func SetInstance(i Ops) {
instance = i
}
// New builds a new admissionregistration client.
func New(client apiadmissionsclient.AdmissionregistrationV1beta1Interface) *Client {
return &Client{
admission: client,
}
}
// NewForConfig builds a new admissionregistration client for the given config.
func NewForConfig(c *rest.Config) (*Client, error) {
client, err := apiadmissionsclient.NewForConfig(c)
if err != nil {
return nil, err
}
return &Client{
admission: client,
}, nil
}
// NewInstanceFromConfigFile returns new instance of client by using given
// config file
func NewInstanceFromConfigFile(config string) (Ops, error) {
newInstance := &Client{}
err := newInstance.loadClientFromKubeconfig(config)
if err != nil {
return nil, err
}
return newInstance, nil
}
// Client provides a wrapper for kubernetes admission interface.
type Client struct {
config *rest.Config
admission apiadmissionsclient.AdmissionregistrationV1beta1Interface
}
// SetConfig sets the config and resets the client.
func (c *Client) SetConfig(cfg *rest.Config) {
c.config = cfg
c.admission = nil
}
// initClient the k8s client if uninitialized
func (c *Client) initClient() error {
if c.admission != nil {
return nil
}
return c.setClient()
}
// setClient instantiates a client.
func (c *Client) setClient() error {
var err error
if c.config != nil {
err = c.loadClient()
} else {
kubeconfig := os.Getenv("KUBECONFIG")
if len(kubeconfig) > 0 {
err = c.loadClientFromKubeconfig(kubeconfig)
} else {
err = c.loadClientFromServiceAccount()
}
}
return err
}
// loadClientFromServiceAccount loads a k8s client from a ServiceAccount specified in the pod running px
func (c *Client) loadClientFromServiceAccount() error {
config, err := rest.InClusterConfig()
if err != nil {
return err
}
c.config = config
return c.loadClient()
}
func (c *Client) loadClientFromKubeconfig(kubeconfig string) error {
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return err
}
c.config = config
return c.loadClient()
}
func (c *Client) loadClient() error {
if c.config == nil {
return fmt.Errorf("rest config is not provided")
}
var err error
c.admission, err = apiadmissionsclient.NewForConfig(c.config)
if err != nil {
return err
}
return nil
}