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delete.go
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delete.go
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package client
import (
"context"
"encoding/base64"
"fmt"
"time"
"github.com/pkg/errors"
"github.com/replicatedhq/kots/pkg/binaries"
"github.com/replicatedhq/kots/pkg/k8sutil"
"github.com/replicatedhq/kots/pkg/logger"
"github.com/replicatedhq/kots/pkg/operator/applier"
"github.com/replicatedhq/kots/pkg/operator/types"
"github.com/replicatedhq/kots/pkg/util"
kuberneteserrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/discovery"
)
type DiffAndDeleteOptions struct {
PreviousManifests string
CurrentManifests string
AdditionalNamespaces []string
IsRestore bool
RestoreLabelSelector *metav1.LabelSelector
KubectlVersion string
KustomizeVersion string
Wait bool
}
func (c *Client) diffAndDeleteManifests(opts DiffAndDeleteOptions) error {
decodedPrevious, err := base64.StdEncoding.DecodeString(opts.PreviousManifests)
if err != nil {
return errors.Wrap(err, "failed to base64 decode previous manifests")
}
decodedCurrent, err := base64.StdEncoding.DecodeString(opts.CurrentManifests)
if err != nil {
return errors.Wrap(err, "failed to base64 decode manifests")
}
// we need to find the gvk+names that are present in the previous, but not in the current and then remove them
// namespaces that were removed from YAML and added to additionalNamespaces should not be removed
decodedPreviousDocs := util.ConvertToSingleDocs(decodedPrevious)
type previousObject struct {
spec string
delete bool
}
decodedPreviousMap := map[string]previousObject{}
for _, decodedPreviousDoc := range decodedPreviousDocs {
k, o := GetGVKWithNameAndNs(decodedPreviousDoc, c.TargetNamespace)
delete := true
if o.APIVersion == "v1" && o.Kind == "Namespace" {
for _, n := range opts.AdditionalNamespaces {
if o.Metadata.Name == n {
delete = false
break
}
}
}
// if this is a restore process, only delete resources that are part of the backup and will be restored
// e.g. resources that do not have the exclude label, and match the restore/backup label selector
if opts.IsRestore {
if excludeLabel, exists := o.Metadata.Labels["velero.io/exclude-from-backup"]; exists && excludeLabel == "true" {
delete = false
}
if opts.RestoreLabelSelector != nil {
s, err := metav1.LabelSelectorAsSelector(opts.RestoreLabelSelector)
if err != nil {
return errors.Wrap(err, "failed to convert label selector to a selector")
}
if !s.Matches(labels.Set(o.Metadata.Labels)) {
delete = false
}
}
}
decodedPreviousMap[k] = previousObject{
spec: string(decodedPreviousDoc),
delete: delete,
}
}
// now get the current names
decodedCurrentDocs := util.ConvertToSingleDocs(decodedCurrent)
decodedCurrentMap := map[string]string{}
for _, decodedCurrentDoc := range decodedCurrentDocs {
k, _ := GetGVKWithNameAndNs(decodedCurrentDoc, c.TargetNamespace)
decodedCurrentMap[k] = string(decodedCurrentDoc)
}
kubectl, err := binaries.GetKubectlPathForVersion(opts.KubectlVersion)
if err != nil {
return errors.Wrap(err, "failed to find kubectl")
}
kustomize, err := binaries.GetKustomizePathForVersion(opts.KustomizeVersion)
if err != nil {
return errors.Wrap(err, "failed to find kustomize")
}
config, err := k8sutil.GetClusterConfig()
if err != nil {
return errors.Wrap(err, "failed to get cluster config")
}
// this is pretty raw, and required kubectl... we should
// consider some other options here?
kubernetesApplier := applier.NewKubectl(kubectl, kustomize, config)
// now remove anything that's in previous but not in current
manifestsToDelete := [][]byte{}
for k, previous := range decodedPreviousMap {
if _, ok := decodedCurrentMap[k]; ok {
continue
}
if !previous.delete {
continue
}
manifestsToDelete = append(manifestsToDelete, []byte(previous.spec))
}
// TODO: return error here?
c.deleteManifests(manifestsToDelete, kubernetesApplier, opts.Wait)
return nil
}
func (c *Client) deleteManifests(manifests [][]byte, kubernetesApplier applier.KubectlInterface, waitFlag bool) {
resources := decodeManifests(manifests)
c.deleteResources(resources, kubernetesApplier, waitFlag)
}
func (c *Client) deleteResources(resources types.Resources, kubernetesApplier applier.KubectlInterface, waitFlag bool) {
phases := groupAndSortResourcesForDeletion(resources)
for _, phase := range phases {
logger.Infof("deleting resources in phase %s", phase.Name)
for _, r := range phase.Resources {
c.deleteResource(r, waitFlag, kubernetesApplier)
}
}
}
func (c *Client) deleteResource(resource types.Resource, waitFlag bool, kubernetesApplier applier.KubectlInterface) {
group := resource.GetGroup()
version := resource.GetVersion()
kind := resource.GetKind()
name := resource.GetName()
wait := shouldWaitForResourceDeletion(kind, waitFlag)
namespace := resource.GetNamespace()
if namespace == "" {
namespace = c.TargetNamespace
}
if resource.DecodeErrMsg == "" {
logger.Infof("deleting resource %s/%s/%s/%s from namespace %s", group, version, kind, name, namespace)
} else {
logger.Infof("deleting unidentified resource. unable to parse error: %s", resource.DecodeErrMsg)
}
stdout, stderr, err := kubernetesApplier.Remove(namespace, []byte(resource.Manifest), wait)
if err != nil {
logger.Infof("stdout (delete) = %s", stdout)
logger.Infof("stderr (delete) = %s", stderr)
logger.Infof("error: %s", err.Error())
} else {
if resource.DecodeErrMsg == "" {
logger.Infof("deleted resource %s/%s/%s/%s from namespace %s", group, version, kind, name, namespace)
} else {
logger.Info("deleted unidentified resource")
}
}
}
func shouldWaitForResourceDeletion(kind string, waitFlag bool) bool {
if kind == "PersistentVolumeClaim" {
// blocking on PVC delete will create a deadlock if
// it's used by a pod that has not been deleted yet.
return false
}
return waitFlag
}
func (c *Client) clearNamespaces(appSlug string, namespacesToClear []string, isRestore bool, restoreLabelSelector *metav1.LabelSelector) error {
dyn, err := k8sutil.GetDynamicClient()
if err != nil {
return errors.Wrap(err, "failed to get dynamic client")
}
config, err := k8sutil.GetClusterConfig()
if err != nil {
return errors.Wrap(err, "failed to get cluster config")
}
disc, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return errors.Wrap(err, "failed to create discovery client")
}
resourceList, err := disc.ServerPreferredNamespacedResources()
if err != nil {
// An application can define an APIService handled by a Deployment in the application itself.
// In that case there will be a race condition listing resources in that API group and there
// could be an error here. Most of the API groups would still be in the resource list so the
// error is not terminal.
logger.Infof("Failed to list all resources: %v", err)
}
gvrs, err := discovery.GroupVersionResources(resourceList)
if err != nil {
return errors.Wrap(err, "failed to get group version resources")
}
// skip resources that don't have API endpoints or don't have applied objects
var skip = sets.NewString(
"/v1/bindings",
"/v1/events",
"extensions/v1beta1/replicationcontrollers",
"apps/v1/controllerrevisions",
"authentication.k8s.io/v1/tokenreviews",
"authorization.k8s.io/v1/localsubjectaccessreviews",
"authorization.k8s.io/v1/subjectaccessreviews",
"authorization.k8s.io/v1/selfsubjectaccessreviews",
"authorization.k8s.io/v1/selfsubjectrulesreviews",
)
gvrsToDelete := []schema.GroupVersionResource{}
for gvr := range gvrs {
s := fmt.Sprintf("%s/%s/%s", gvr.Group, gvr.Version, gvr.Resource)
if !skip.Has(s) {
gvrsToDelete = append(gvrsToDelete, gvr)
}
}
listResourcesToDelete := func(namespace string) (types.Resources, error) {
resources := types.Resources{}
for _, gvr := range gvrsToDelete {
// there may be other resources that can't be
// listed besides what's in the skip set so ignore error
unstructuredList, err := dyn.Resource(gvr).Namespace(namespace).List(context.TODO(), metav1.ListOptions{})
if unstructuredList == nil {
if err != nil {
logger.Errorf("failed to list namespace resources: %s", err.Error())
}
continue
}
for _, u := range unstructuredList.Items {
// if this is a restore process, only delete resources that are part of the backup and will be restored
// e.g. resources that do not have the exclude label, and match the restore/backup label selector
if isRestore {
itemLabelsMap := u.GetLabels()
if excludeLabel, exists := itemLabelsMap["velero.io/exclude-from-backup"]; exists && excludeLabel == "true" {
continue
}
if restoreLabelSelector != nil {
s, err := metav1.LabelSelectorAsSelector(restoreLabelSelector)
if err != nil {
return nil, errors.Wrap(err, "failed to convert label selector to a selector")
}
if !s.Matches(labels.Set(itemLabelsMap)) {
continue
}
}
}
if u.GetAnnotations()["kots.io/app-slug"] == appSlug {
unstructured := u.DeepCopy()
gvk := unstructured.GetObjectKind().GroupVersionKind()
resource := types.Resource{
Unstructured: unstructured,
GVK: &gvk,
GVR: gvr,
}
resources = append(resources, resource)
}
}
}
return resources, nil
}
sleepTime := time.Second * 2
for i := 60; i >= 0; i-- { // 2 minute wait
resourcesToDelete := types.Resources{}
for _, namespace := range namespacesToClear {
rs, err := listResourcesToDelete(namespace)
if err != nil {
return errors.Wrapf(err, "failed to list resources to delete in namespace %s", namespace)
}
resourcesToDelete = append(resourcesToDelete, rs...)
}
if len(resourcesToDelete) == 0 {
logger.Infof("Successfully cleared all resources for app %s\n", appSlug)
return nil
}
phases := groupAndSortResourcesForDeletion(resourcesToDelete)
for _, phase := range phases {
logger.Infof("Deleting resources in phase %s", phase.Name)
for _, r := range phase.Resources {
if r.Unstructured.GetDeletionTimestamp() != nil {
logger.Infof("Pending deletion %s/%s/%s/%s/%s", r.Unstructured.GetNamespace(), r.GVR.Group, r.GVR.Version, r.GVR.Resource, r.Unstructured.GetName())
continue
}
logger.Infof("Deleting %s/%s/%s/%s/%s", r.Unstructured.GetNamespace(), r.GVR.Group, r.GVR.Version, r.GVR.Resource, r.Unstructured.GetName())
if err := dyn.Resource(r.GVR).Namespace(r.Unstructured.GetNamespace()).Delete(context.TODO(), r.Unstructured.GetName(), metav1.DeleteOptions{}); err != nil {
logger.Errorf("Resource %s/%s/%s/%s/%s could not be deleted: %v", r.Unstructured.GetNamespace(), r.GVR.Group, r.GVR.Version, r.GVR.Resource, r.Unstructured.GetName(), err)
}
}
}
time.Sleep(sleepTime)
}
return fmt.Errorf("failed to clear all resources for app %s", appSlug)
}
func (c *Client) deletePVCs(appLabelSelector *metav1.LabelSelector, appslug string) error {
clientset, err := k8sutil.GetClientset()
if err != nil {
return errors.Wrap(err, "failed to get k8s clientset")
}
if appLabelSelector == nil {
appLabelSelector = &metav1.LabelSelector{
MatchLabels: map[string]string{},
}
}
appLabelSelector.MatchLabels["kots.io/app-slug"] = appslug
appSelector, err := metav1.LabelSelectorAsSelector(appLabelSelector)
if err != nil {
return errors.Wrap(err, "failed to convert label selector to a selector")
}
podsList, err := clientset.CoreV1().Pods(c.TargetNamespace).List(context.TODO(), metav1.ListOptions{
LabelSelector: appSelector.String(),
})
if err != nil {
return errors.Wrap(err, "failed to get list of app pods")
}
pvcs := make([]string, 0)
for _, pod := range podsList.Items {
for _, v := range pod.Spec.Volumes {
if v.PersistentVolumeClaim != nil {
pvcs = append(pvcs, v.PersistentVolumeClaim.ClaimName)
}
}
}
if len(pvcs) == 0 {
logger.Infof("no pvcs to delete in %s for pods that match %s", c.TargetNamespace, appSelector.String())
return nil
}
logger.Infof("deleting %d pvcs in %s for pods that match %s", len(pvcs), c.TargetNamespace, appSelector.String())
for _, pvc := range pvcs {
grace := int64(0)
policy := metav1.DeletePropagationBackground
opts := metav1.DeleteOptions{
GracePeriodSeconds: &grace,
PropagationPolicy: &policy,
}
logger.Infof("deleting pvc: %s", pvc)
err := clientset.CoreV1().PersistentVolumeClaims(c.TargetNamespace).Delete(context.TODO(), pvc, opts)
if err != nil && !kuberneteserrors.IsNotFound(err) {
return errors.Wrapf(err, "failed to delete pvc %s", pvc)
}
}
return nil
}