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main.go
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main.go
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package main
import (
"context"
"errors"
"fmt"
"log"
"os"
"os/signal"
"path"
"time"
"github.com/google/uuid"
"github.com/pachyderm/fakeapiserver/pkg/pods"
"go.etcd.io/etcd/server/v3/embed"
corev1 "k8s.io/api/core/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apiserver/pkg/storage/storagebackend"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientapi "k8s.io/client-go/tools/clientcmd/api"
apiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
cmtesting "k8s.io/kubernetes/cmd/kube-controller-manager/app/testing"
"k8s.io/utils/pointer"
)
type l struct {
}
func (l) Errorf(format string, args ...interface{}) {
log.Printf(format, args...)
}
func (l) Fatalf(format string, args ...interface{}) {
log.Fatalf(format, args...)
}
func (l) Logf(format string, args ...interface{}) {
log.Printf(format, args...)
}
func main() {
if err := run(); err != nil {
log.Fatal(err)
}
}
func run() error {
// Create an etcd server.
cfg := embed.NewConfig()
cfg.Dir = "default.etcd" // TODO: make unique per invocation
e, err := embed.StartEtcd(cfg)
if err != nil {
return fmt.Errorf("start etcd: %w", err)
}
defer e.Close()
select {
case <-e.Server.ReadyNotify():
case <-time.After(60 * time.Second):
e.Server.Stop() // trigger a shutdown
return errors.New("etcd server took too long to start")
}
var etcdURL string
for _, u := range cfg.ACUrls {
etcdURL = u.String()
if etcdURL != "" {
break
}
}
if etcdURL == "" {
return errors.New("no etcd URL?")
}
// Shut up k8s warnings.
rest.SetDefaultWarningHandler(
rest.NewWarningWriter(os.Stderr, rest.WarningWriterOptions{
// only print a given warning the first time we receive it
Deduplicate: true,
// highlight the output with color when the output supports it
Color: false,
},
),
)
// Create an apiserver pointed at the etcd we just created.
storageConfig := storagebackend.NewDefaultConfig(path.Join(uuid.New().String(), "registry"), nil)
storageConfig.Transport.ServerList = []string{etcdURL}
storageConfig.Transport.CertFile = cfg.ClientTLSInfo.CertFile
storageConfig.Transport.KeyFile = cfg.ClientTLSInfo.KeyFile
opts := apiservertesting.NewDefaultTestServerOptions()
api, err := apiservertesting.StartTestServer(l{}, opts, nil, storageConfig)
if err != nil {
return fmt.Errorf("start kube-apiserer: %w", err)
}
defer api.TearDownFn()
log.Printf("** kube-apiserver listening on %v", api.ClientConfig.Host)
// Write a kubeconfig file to /tmp.
kubeconfigFD, err := os.CreateTemp("", "test-apiserver-kubeconfig-*")
if err != nil {
return fmt.Errorf("create file for kubeconfig: %w", err)
}
kubeconfigFD.Close()
defer os.Remove(kubeconfigFD.Name())
kubeconfig := clientapi.Config{
Preferences: *clientapi.NewPreferences(),
Extensions: make(map[string]runtime.Object),
Clusters: map[string]*clientapi.Cluster{
"test-apiserver": {
InsecureSkipTLSVerify: true,
Server: api.ClientConfig.Host,
// TODO: make this work ;)
//CertificateAuthorityData: api.ClientConfig.CAData,
},
},
Contexts: map[string]*clientapi.Context{
"test-apiserver": {
Cluster: "test-apiserver",
AuthInfo: "test-apiserver",
},
},
CurrentContext: "test-apiserver",
AuthInfos: map[string]*clientapi.AuthInfo{
"test-apiserver": {
Token: api.ClientConfig.BearerToken,
},
},
}
if err := clientcmd.WriteToFile(kubeconfig, kubeconfigFD.Name()); err != nil {
return fmt.Errorf("write kubeconfig file: %w", err)
}
// Link this kubeconfig to /tmp/kubeconfig for easy CLI manipulation when only one is running.
os.Remove("/tmp/kubeconfig") // nolint: errcheck
os.Symlink(kubeconfigFD.Name(), "/tmp/kubeconfig") // nolint: errcheck
log.Printf("** kubeconfig at %v\n", kubeconfigFD.Name())
// Create a kube-controller-manager.
ctrlmgr, err := cmtesting.StartTestServer(l{}, []string{
fmt.Sprintf("--kubeconfig=%s", kubeconfigFD.Name()),
})
if err != nil {
return fmt.Errorf("start kube-controller-manager: %w", err)
}
defer ctrlmgr.TearDownFn()
// Connect to the apiserver.
k8s, err := kubernetes.NewForConfig(api.ClientConfig)
if err != nil {
return fmt.Errorf("create clientset connected to the apiserver: %w", err)
}
// Run our mini-kubelet.
pmDone := make(chan struct{})
pm := pods.Manager{
K8s: k8s,
UserCode: map[string]pods.UserCode{
"busybox": func(pod *corev1.Pod, container *corev1.Container, stopCh <-chan struct{}) error {
for i := 0; ; i++ {
select {
case <-time.After(time.Second):
log.Printf("**** this is busybox on %v, iteration %d", pod.Name, i)
case <-stopCh:
log.Printf("**** busybox on %v killed", pod.Name)
return errors.New("killed")
}
}
},
},
}
go func() {
defer close(pmDone)
if err := pm.Run(context.Background(), "default"); err != nil {
log.Fatalf("pod manager died: %v", err)
}
}()
// Add an RC.
applyRCAndWatch(k8s)
intCh := make(chan os.Signal, 1)
signal.Notify(intCh, os.Interrupt)
// Block.
select {
case <-pmDone:
log.Printf("pod manager exited; shutting down")
return nil
case <-intCh:
log.Printf("interrupt; shutting down")
signal.Stop(intCh)
return nil
}
}
func applyRCAndWatch(k8s *kubernetes.Clientset) {
if _, err := k8s.CoreV1().Services("default").Create(context.TODO(), &corev1.Service{
ObjectMeta: v1.ObjectMeta{
Name: "test-rc",
Namespace: "default",
},
Spec: corev1.ServiceSpec{
Type: corev1.ServiceTypeClusterIP,
ClusterIP: "None",
Ports: []corev1.ServicePort{
{
Name: "foo",
Protocol: corev1.ProtocolTCP,
Port: 1234,
TargetPort: intstr.FromInt(1234),
},
},
Selector: map[string]string{"app": "test"},
},
}, v1.CreateOptions{}); err != nil {
panic(err)
}
if _, err := k8s.CoreV1().ReplicationControllers("default").Create(context.TODO(), &corev1.ReplicationController{
ObjectMeta: v1.ObjectMeta{
Name: "test-rc",
Namespace: "default",
},
Spec: corev1.ReplicationControllerSpec{
Replicas: pointer.Int32Ptr(2),
Selector: map[string]string{"app": "test"},
Template: &corev1.PodTemplateSpec{
ObjectMeta: v1.ObjectMeta{
Labels: map[string]string{"app": "test"},
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
{
Name: "busybox",
Image: "busybox",
Command: []string{"sleep", "infinity"},
Ports: []corev1.ContainerPort{
{
Name: "foo",
ContainerPort: 1234,
},
},
},
},
},
},
},
}, v1.CreateOptions{}); err != nil {
panic(err)
}
}