/
client.go
executable file
·636 lines (584 loc) · 20.4 KB
/
client.go
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package kubernetes
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"strings"
"sync"
"time"
"github.com/weaveworks/common/backoff"
snapshotv1 "github.com/openebs/k8s-snapshot-client/snapshot/pkg/apis/volumesnapshot/v1"
snapshot "github.com/openebs/k8s-snapshot-client/snapshot/pkg/client/clientset/versioned"
"github.com/pborman/uuid"
log "github.com/sirupsen/logrus"
apiappsv1 "k8s.io/api/apps/v1"
apiappsv1beta1 "k8s.io/api/apps/v1beta1"
apibatchv1 "k8s.io/api/batch/v1"
apibatchv1beta1 "k8s.io/api/batch/v1beta1"
apibatchv2alpha1 "k8s.io/api/batch/v2alpha1"
apiv1 "k8s.io/api/core/v1"
apiextensionsv1beta1 "k8s.io/api/extensions/v1beta1"
storagev1 "k8s.io/api/storage/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
apimeta "k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
kubectldescribe "k8s.io/kubernetes/pkg/kubectl/describe"
kubectl "k8s.io/kubernetes/pkg/kubectl/describe/versioned"
)
// Client keeps track of running kubernetes pods and services
type Client interface {
Stop()
WalkPods(f func(Pod) error) error
WalkServices(f func(Service) error) error
WalkDeployments(f func(Deployment) error) error
WalkDaemonSets(f func(DaemonSet) error) error
WalkStatefulSets(f func(StatefulSet) error) error
WalkCronJobs(f func(CronJob) error) error
WalkNamespaces(f func(NamespaceResource) error) error
WalkPersistentVolumes(f func(PersistentVolume) error) error
WalkPersistentVolumeClaims(f func(PersistentVolumeClaim) error) error
WalkStorageClasses(f func(StorageClass) error) error
WalkVolumeSnapshots(f func(VolumeSnapshot) error) error
WalkVolumeSnapshotData(f func(VolumeSnapshotData) error) error
WalkJobs(f func(Job) error) error
WatchPods(f func(Event, Pod))
CloneVolumeSnapshot(namespaceID, volumeSnapshotID, persistentVolumeClaimID, capacity string) error
CreateVolumeSnapshot(namespaceID, persistentVolumeClaimID, capacity string) error
GetLogs(namespaceID, podID string, containerNames []string) (io.ReadCloser, error)
Describe(namespaceID, resourceID string, groupKind schema.GroupKind, restMapping apimeta.RESTMapping) (io.ReadCloser, error)
DeletePod(namespaceID, podID string) error
DeleteVolumeSnapshot(namespaceID, volumeSnapshotID string) error
ScaleUp(namespaceID, id string) error
ScaleDown(namespaceID, id string) error
}
// ResourceMap is the mapping of resource and their GroupKind
var ResourceMap = map[string]schema.GroupKind{
"Pod": {Group: apiv1.GroupName, Kind: "Pod"},
"Service": {Group: apiv1.GroupName, Kind: "Service"},
"Deployment": {Group: apiappsv1.GroupName, Kind: "Deployment"},
"DaemonSet": {Group: apiappsv1.GroupName, Kind: "DaemonSet"},
"StatefulSet": {Group: apiappsv1.GroupName, Kind: "StatefulSet"},
"Job": {Group: apibatchv1.GroupName, Kind: "Job"},
"CronJob": {Group: apibatchv1.GroupName, Kind: "CronJob"},
"Node": {Group: apiv1.GroupName, Kind: "Node"},
"PersistentVolume": {Group: apiv1.GroupName, Kind: "PersistentVolume"},
"PersistentVolumeClaim": {Group: apiv1.GroupName, Kind: "PersistentVolumeClaim"},
"StorageClass": {Group: storagev1.GroupName, Kind: "StorageClass"},
}
type client struct {
quit chan struct{}
client *kubernetes.Clientset
snapshotClient *snapshot.Clientset
podStore cache.Store
serviceStore cache.Store
deploymentStore cache.Store
daemonSetStore cache.Store
statefulSetStore cache.Store
jobStore cache.Store
cronJobStore cache.Store
nodeStore cache.Store
namespaceStore cache.Store
persistentVolumeStore cache.Store
persistentVolumeClaimStore cache.Store
storageClassStore cache.Store
volumeSnapshotStore cache.Store
volumeSnapshotDataStore cache.Store
podWatchesMutex sync.Mutex
podWatches []func(Event, Pod)
}
// ClientConfig establishes the configuration for the kubernetes client
type ClientConfig struct {
CertificateAuthority string
ClientCertificate string
ClientKey string
Cluster string
Context string
Insecure bool
Kubeconfig string
Password string
Server string
Token string
User string
Username string
}
// NewClient returns a usable Client. Don't forget to Stop it.
func NewClient(config ClientConfig) (Client, error) {
var restConfig *rest.Config
if config.Server == "" && config.Kubeconfig == "" {
// If no API server address or kubeconfig was provided, assume we are running
// inside a pod. Try to connect to the API server through its
// Service environment variables, using the default Service
// Account Token.
var err error
if restConfig, err = rest.InClusterConfig(); err != nil {
return nil, err
}
} else {
var err error
restConfig, err = clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
&clientcmd.ClientConfigLoadingRules{ExplicitPath: config.Kubeconfig},
&clientcmd.ConfigOverrides{
AuthInfo: clientcmdapi.AuthInfo{
ClientCertificate: config.ClientCertificate,
ClientKey: config.ClientKey,
Token: config.Token,
Username: config.Username,
Password: config.Password,
},
ClusterInfo: clientcmdapi.Cluster{
Server: config.Server,
InsecureSkipTLSVerify: config.Insecure,
CertificateAuthority: config.CertificateAuthority,
},
Context: clientcmdapi.Context{
Cluster: config.Cluster,
AuthInfo: config.User,
},
CurrentContext: config.Context,
},
).ClientConfig()
if err != nil {
return nil, err
}
}
log.Infof("kubernetes: targeting api server %s", restConfig.Host)
c, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return nil, err
}
sc, err := snapshot.NewForConfig(restConfig)
if err != nil {
return nil, err
}
result := &client{
quit: make(chan struct{}),
client: c,
snapshotClient: sc,
}
result.podStore = NewEventStore(result.triggerPodWatches, cache.MetaNamespaceKeyFunc)
result.runReflectorUntil("pods", result.podStore)
result.serviceStore = result.setupStore("services")
result.nodeStore = result.setupStore("nodes")
result.namespaceStore = result.setupStore("namespaces")
result.deploymentStore = result.setupStore("deployments")
result.daemonSetStore = result.setupStore("daemonsets")
result.jobStore = result.setupStore("jobs")
result.statefulSetStore = result.setupStore("statefulsets")
result.cronJobStore = result.setupStore("cronjobs")
result.persistentVolumeStore = result.setupStore("persistentvolumes")
result.persistentVolumeClaimStore = result.setupStore("persistentvolumeclaims")
result.storageClassStore = result.setupStore("storageclasses")
result.volumeSnapshotStore = result.setupStore("volumesnapshots")
result.volumeSnapshotDataStore = result.setupStore("volumesnapshotdatas")
return result, nil
}
func (c *client) isResourceSupported(groupVersion schema.GroupVersion, resource string) (bool, error) {
resourceList, err := c.client.Discovery().ServerResourcesForGroupVersion(groupVersion.String())
if err != nil {
if apierrors.IsNotFound(err) {
return false, nil
}
return false, err
}
for _, v := range resourceList.APIResources {
if v.Name == resource {
return true, nil
}
}
return false, nil
}
func (c *client) setupStore(resource string) cache.Store {
store := cache.NewStore(cache.MetaNamespaceKeyFunc)
c.runReflectorUntil(resource, store)
return store
}
func (c *client) clientAndType(resource string) (rest.Interface, interface{}, error) {
switch resource {
case "pods":
return c.client.CoreV1().RESTClient(), &apiv1.Pod{}, nil
case "services":
return c.client.CoreV1().RESTClient(), &apiv1.Service{}, nil
case "nodes":
return c.client.CoreV1().RESTClient(), &apiv1.Node{}, nil
case "namespaces":
return c.client.CoreV1().RESTClient(), &apiv1.Namespace{}, nil
case "persistentvolumes":
return c.client.CoreV1().RESTClient(), &apiv1.PersistentVolume{}, nil
case "persistentvolumeclaims":
return c.client.CoreV1().RESTClient(), &apiv1.PersistentVolumeClaim{}, nil
case "storageclasses":
return c.client.StorageV1().RESTClient(), &storagev1.StorageClass{}, nil
case "deployments":
return c.client.ExtensionsV1beta1().RESTClient(), &apiextensionsv1beta1.Deployment{}, nil
case "daemonsets":
return c.client.ExtensionsV1beta1().RESTClient(), &apiextensionsv1beta1.DaemonSet{}, nil
case "jobs":
return c.client.BatchV1().RESTClient(), &apibatchv1.Job{}, nil
case "statefulsets":
return c.client.AppsV1beta1().RESTClient(), &apiappsv1beta1.StatefulSet{}, nil
case "volumesnapshots":
return c.snapshotClient.VolumesnapshotV1().RESTClient(), &snapshotv1.VolumeSnapshot{}, nil
case "volumesnapshotdatas":
return c.snapshotClient.VolumesnapshotV1().RESTClient(), &snapshotv1.VolumeSnapshotData{}, nil
case "cronjobs":
ok, err := c.isResourceSupported(c.client.BatchV1beta1().RESTClient().APIVersion(), resource)
if err != nil {
return nil, nil, err
}
if ok {
// kubernetes >= 1.8
return c.client.BatchV1beta1().RESTClient(), &apibatchv1beta1.CronJob{}, nil
}
// kubernetes < 1.8
return c.client.BatchV2alpha1().RESTClient(), &apibatchv2alpha1.CronJob{}, nil
}
return nil, nil, fmt.Errorf("Invalid resource: %v", resource)
}
// runReflectorUntil runs cache.Reflector#ListAndWatch in an endless loop, after checking that the resource is supported by kubernetes.
// Errors are logged and retried with exponential backoff.
func (c *client) runReflectorUntil(resource string, store cache.Store) {
var r *cache.Reflector
listAndWatch := func() (bool, error) {
if r == nil {
kclient, itemType, err := c.clientAndType(resource)
if err != nil {
return false, err
}
ok, err := c.isResourceSupported(kclient.APIVersion(), resource)
if err != nil {
return false, err
}
if !ok {
log.Infof("%v are not supported by this Kubernetes version", resource)
return true, nil
}
lw := cache.NewListWatchFromClient(kclient, resource, metav1.NamespaceAll, fields.Everything())
r = cache.NewReflector(lw, itemType, store, 0)
}
select {
case <-c.quit:
return true, nil
default:
err := r.ListAndWatch(c.quit)
return false, err
}
}
bo := backoff.New(listAndWatch, fmt.Sprintf("Kubernetes reflector (%s)", resource))
bo.SetMaxBackoff(5 * time.Minute)
go bo.Start()
}
func (c *client) WatchPods(f func(Event, Pod)) {
c.podWatchesMutex.Lock()
defer c.podWatchesMutex.Unlock()
c.podWatches = append(c.podWatches, f)
}
func (c *client) triggerPodWatches(e Event, pod interface{}) {
c.podWatchesMutex.Lock()
defer c.podWatchesMutex.Unlock()
for _, watch := range c.podWatches {
watch(e, NewPod(pod.(*apiv1.Pod)))
}
}
func (c *client) WalkPods(f func(Pod) error) error {
for _, m := range c.podStore.List() {
pod := m.(*apiv1.Pod)
if err := f(NewPod(pod)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkPersistentVolumes(f func(PersistentVolume) error) error {
for _, m := range c.persistentVolumeStore.List() {
pv := m.(*apiv1.PersistentVolume)
if err := f(NewPersistentVolume(pv)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkPersistentVolumeClaims(f func(PersistentVolumeClaim) error) error {
for _, m := range c.persistentVolumeClaimStore.List() {
pvc := m.(*apiv1.PersistentVolumeClaim)
if err := f(NewPersistentVolumeClaim(pvc)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkStorageClasses(f func(StorageClass) error) error {
for _, m := range c.storageClassStore.List() {
sc := m.(*storagev1.StorageClass)
if err := f(NewStorageClass(sc)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkServices(f func(Service) error) error {
for _, m := range c.serviceStore.List() {
s := m.(*apiv1.Service)
if err := f(NewService(s)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkDeployments(f func(Deployment) error) error {
if c.deploymentStore == nil {
return nil
}
for _, m := range c.deploymentStore.List() {
d := m.(*apiextensionsv1beta1.Deployment)
if err := f(NewDeployment(d)); err != nil {
return err
}
}
return nil
}
// WalkDaemonSets calls f for each daemonset
func (c *client) WalkDaemonSets(f func(DaemonSet) error) error {
if c.daemonSetStore == nil {
return nil
}
for _, m := range c.daemonSetStore.List() {
ds := m.(*apiextensionsv1beta1.DaemonSet)
if err := f(NewDaemonSet(ds)); err != nil {
return err
}
}
return nil
}
// WalkStatefulSets calls f for each statefulset
func (c *client) WalkStatefulSets(f func(StatefulSet) error) error {
if c.statefulSetStore == nil {
return nil
}
for _, m := range c.statefulSetStore.List() {
s := m.(*apiappsv1beta1.StatefulSet)
if err := f(NewStatefulSet(s)); err != nil {
return err
}
}
return nil
}
// WalkCronJobs calls f for each cronjob
func (c *client) WalkCronJobs(f func(CronJob) error) error {
if c.cronJobStore == nil {
return nil
}
// We index jobs by id to make lookup for each cronjob more efficient
jobs := map[types.UID]*apibatchv1.Job{}
for _, m := range c.jobStore.List() {
j := m.(*apibatchv1.Job)
jobs[j.UID] = j
}
for _, m := range c.cronJobStore.List() {
if err := f(NewCronJob(m, jobs)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkNamespaces(f func(NamespaceResource) error) error {
for _, m := range c.namespaceStore.List() {
namespace := m.(*apiv1.Namespace)
if err := f(NewNamespace(namespace)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkVolumeSnapshots(f func(VolumeSnapshot) error) error {
for _, m := range c.volumeSnapshotStore.List() {
volumeSnapshot := m.(*snapshotv1.VolumeSnapshot)
if err := f(NewVolumeSnapshot(volumeSnapshot)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkVolumeSnapshotData(f func(VolumeSnapshotData) error) error {
for _, m := range c.volumeSnapshotDataStore.List() {
volumeSnapshotData := m.(*snapshotv1.VolumeSnapshotData)
if err := f(NewVolumeSnapshotData(volumeSnapshotData)); err != nil {
return err
}
}
return nil
}
func (c *client) WalkJobs(f func(Job) error) error {
for _, m := range c.jobStore.List() {
job := m.(*apibatchv1.Job)
if err := f(NewJob(job)); err != nil {
return err
}
}
return nil
}
func (c *client) CloneVolumeSnapshot(namespaceID, volumeSnapshotID, persistentVolumeClaimID, capacity string) error {
var scName string
var claimSize string
UID := strings.Split(uuid.New(), "-")
scProvisionerName := "volumesnapshot.external-storage.k8s.io/snapshot-promoter"
scList, err := c.client.StorageV1().StorageClasses().List(metav1.ListOptions{})
if err != nil {
return err
}
// Retrieve the first snapshot-promoter storage class
for _, sc := range scList.Items {
if sc.Provisioner == scProvisionerName {
scName = sc.Name
break
}
}
if scName == "" {
return errors.New("snapshot-promoter storage class is not present")
}
volumeSnapshot, _ := c.snapshotClient.VolumesnapshotV1().VolumeSnapshots(namespaceID).Get(volumeSnapshotID, metav1.GetOptions{})
if volumeSnapshot.Spec.PersistentVolumeClaimName != "" {
persistentVolumeClaim, err := c.client.CoreV1().PersistentVolumeClaims(namespaceID).Get(volumeSnapshot.Spec.PersistentVolumeClaimName, metav1.GetOptions{})
if err == nil {
storage := persistentVolumeClaim.Spec.Resources.Requests[apiv1.ResourceStorage]
if storage.String() != "" {
claimSize = storage.String()
}
}
}
// Set default volume size to the one stored in volume snapshot annotation,
// if unable to get PVC size.
if claimSize == "" {
claimSize = capacity
}
persistentVolumeClaim := &apiv1.PersistentVolumeClaim{
ObjectMeta: metav1.ObjectMeta{
Name: "clone-" + persistentVolumeClaimID + "-" + UID[1],
Namespace: namespaceID,
Annotations: map[string]string{
"snapshot.alpha.kubernetes.io/snapshot": volumeSnapshotID,
},
},
Spec: apiv1.PersistentVolumeClaimSpec{
StorageClassName: &scName,
AccessModes: []apiv1.PersistentVolumeAccessMode{
apiv1.ReadWriteOnce,
},
Resources: apiv1.ResourceRequirements{
Requests: apiv1.ResourceList{
apiv1.ResourceName(apiv1.ResourceStorage): resource.MustParse(claimSize),
},
},
},
}
_, err = c.client.CoreV1().PersistentVolumeClaims(namespaceID).Create(persistentVolumeClaim)
if err != nil {
return err
}
return nil
}
func (c *client) CreateVolumeSnapshot(namespaceID, persistentVolumeClaimID, capacity string) error {
UID := strings.Split(uuid.New(), "-")
volumeSnapshot := &snapshotv1.VolumeSnapshot{
ObjectMeta: metav1.ObjectMeta{
Name: "snapshot-" + time.Now().Format("20060102150405") + "-" + UID[1],
Namespace: namespaceID,
Annotations: map[string]string{
"capacity": capacity,
},
},
Spec: snapshotv1.VolumeSnapshotSpec{
PersistentVolumeClaimName: persistentVolumeClaimID,
},
}
_, err := c.snapshotClient.VolumesnapshotV1().VolumeSnapshots(namespaceID).Create(volumeSnapshot)
if err != nil {
return err
}
return nil
}
func (c *client) GetLogs(namespaceID, podID string, containerNames []string) (io.ReadCloser, error) {
readClosersWithLabel := map[io.ReadCloser]string{}
for _, container := range containerNames {
req := c.client.CoreV1().Pods(namespaceID).GetLogs(
podID,
&apiv1.PodLogOptions{
Follow: true,
Timestamps: true,
Container: container,
},
)
readCloser, err := req.Stream()
if err != nil {
for rc := range readClosersWithLabel {
rc.Close()
}
return nil, err
}
readClosersWithLabel[readCloser] = container
}
return NewLogReadCloser(readClosersWithLabel), nil
}
func (c *client) Describe(namespaceID, resourceID string, groupKind schema.GroupKind, restMapping apimeta.RESTMapping) (io.ReadCloser, error) {
readClosersWithLabel := map[io.ReadCloser]string{}
restConfig, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
describer, ok := kubectl.DescriberFor(groupKind, restConfig)
if !ok {
describer, ok = kubectl.GenericDescriberFor(&restMapping, restConfig)
if !ok {
return nil, errors.New("Resource not found")
}
}
describerSetting := kubectldescribe.DescriberSettings{
ShowEvents: true,
}
obj, err := describer.Describe(namespaceID, resourceID, describerSetting)
if err != nil {
return nil, err
}
formattedObj := ioutil.NopCloser(bytes.NewReader([]byte(obj)))
readClosersWithLabel[formattedObj] = "describe"
return NewLogReadCloser(readClosersWithLabel), nil
}
func (c *client) DeletePod(namespaceID, podID string) error {
return c.client.CoreV1().Pods(namespaceID).Delete(podID, &metav1.DeleteOptions{})
}
func (c *client) DeleteVolumeSnapshot(namespaceID, volumeSnapshotID string) error {
return c.snapshotClient.VolumesnapshotV1().VolumeSnapshots(namespaceID).Delete(volumeSnapshotID, &metav1.DeleteOptions{})
}
func (c *client) ScaleUp(namespaceID, id string) error {
return c.modifyScale(namespaceID, id, func(scale *apiextensionsv1beta1.Scale) {
scale.Spec.Replicas++
})
}
func (c *client) ScaleDown(namespaceID, id string) error {
return c.modifyScale(namespaceID, id, func(scale *apiextensionsv1beta1.Scale) {
scale.Spec.Replicas--
})
}
func (c *client) modifyScale(namespaceID, id string, f func(*apiextensionsv1beta1.Scale)) error {
scaler := c.client.ExtensionsV1beta1().Deployments(namespaceID)
scale, err := scaler.GetScale(id, metav1.GetOptions{})
if err != nil {
return err
}
f(scale)
_, err = scaler.UpdateScale(id, scale)
return err
}
func (c *client) Stop() {
close(c.quit)
}