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operator.go
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operator.go
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package e2e
import (
"fmt"
"os"
"time"
corev1 "k8s.io/api/core/v1"
apiextensions "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"github.com/grtl/mysql-operator/pkg/client/clientset/versioned"
"github.com/grtl/mysql-operator/pkg/testing/kubectl"
)
const (
operatorPod = "mysql-operator"
operatorImage = "--image=mysql-operator:testing"
operatorStartupDelay = 5 * time.Second
)
// Operator represents MySQL operator pod deployed in the cluster
type Operator interface {
Start() error
Stop() error
KubeClientset() kubernetes.Interface
ExtClientset() apiextensions.Interface
Clientset() versioned.Interface
}
type operator struct {
kubeClientset *kubernetes.Clientset
extClientset *apiextensions.Clientset
clientset *versioned.Clientset
}
// NewOperator creates new Operator based on ${KUBECONFIG} env variable.
func NewOperator() (Operator, error) {
kubeconfig, ok := os.LookupEnv("KUBECONFIG")
if !ok {
return nil, fmt.Errorf("environment variable ${KUBECONFIG} not defined")
}
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
newOperator := new(operator)
err = newOperator.initializeClientsets(config)
if err != nil {
return nil, err
}
return newOperator, nil
}
func (o *operator) KubeClientset() kubernetes.Interface {
return o.kubeClientset
}
func (o *operator) ExtClientset() apiextensions.Interface {
return o.extClientset
}
func (o *operator) Clientset() versioned.Interface {
return o.clientset
}
func (o *operator) Start() error {
err := kubectl.Run(operatorPod, operatorImage, "--image-pull-policy=Never", "--restart=Never")
if err != nil {
return err
}
err = o.waitForPodStarted()
if err != nil {
return err
}
time.Sleep(operatorStartupDelay)
return nil
}
func (o *operator) Stop() error {
err := kubectl.Delete("pod", operatorPod)
if err != nil {
return err
}
return o.waitForPodDeleted()
}
func (o *operator) initializeClientsets(config *rest.Config) error {
var err error
o.extClientset, err = apiextensions.NewForConfig(config)
if err != nil {
return err
}
o.clientset, err = versioned.NewForConfig(config)
if err != nil {
return err
}
o.kubeClientset, err = kubernetes.NewForConfig(config)
return err
}
func (o *operator) waitForPodStarted() error {
return wait.Poll(1*time.Second, 30*time.Second, func() (bool, error) {
pod, err := o.kubeClientset.CoreV1().Pods("default").Get(operatorPod, metav1.GetOptions{})
if pod.Status.Phase == corev1.PodRunning {
return true, nil
} else if pod.Status.Phase == corev1.PodFailed {
return false, fmt.Errorf("pod failed -> %v", pod.Status.String())
}
return false, err
})
}
func (o *operator) waitForPodDeleted() error {
return wait.Poll(1*time.Second, 30*time.Second, func() (bool, error) {
_, err := o.kubeClientset.CoreV1().Pods("default").Get(operatorPod, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
return true, nil
}
return false, err
})
}