502 lines
19 KiB
Go
502 lines
19 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controller
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import (
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"fmt"
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"sync"
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"github.com/golang/glog"
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appsv1beta1 "k8s.io/api/apps/v1beta1"
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"k8s.io/api/core/v1"
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extensions "k8s.io/api/extensions/v1beta1"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime/schema"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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)
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type BaseControllerRefManager struct {
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Controller metav1.Object
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Selector labels.Selector
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canAdoptErr error
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canAdoptOnce sync.Once
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CanAdoptFunc func() error
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}
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func (m *BaseControllerRefManager) CanAdopt() error {
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m.canAdoptOnce.Do(func() {
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if m.CanAdoptFunc != nil {
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m.canAdoptErr = m.CanAdoptFunc()
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}
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})
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return m.canAdoptErr
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}
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// ClaimObject tries to take ownership of an object for this controller.
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//
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// It will reconcile the following:
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// * Adopt orphans if the match function returns true.
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// * Release owned objects if the match function returns false.
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//
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// A non-nil error is returned if some form of reconciliation was attempted and
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// failed. Usually, controllers should try again later in case reconciliation
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// is still needed.
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//
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// If the error is nil, either the reconciliation succeeded, or no
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// reconciliation was necessary. The returned boolean indicates whether you now
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// own the object.
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//
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// No reconciliation will be attempted if the controller is being deleted.
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func (m *BaseControllerRefManager) ClaimObject(obj metav1.Object, match func(metav1.Object) bool, adopt, release func(metav1.Object) error) (bool, error) {
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controllerRef := metav1.GetControllerOf(obj)
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if controllerRef != nil {
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if controllerRef.UID != m.Controller.GetUID() {
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// Owned by someone else. Ignore.
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return false, nil
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}
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if match(obj) {
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// We already own it and the selector matches.
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// Return true (successfully claimed) before checking deletion timestamp.
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// We're still allowed to claim things we already own while being deleted
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// because doing so requires taking no actions.
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return true, nil
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}
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// Owned by us but selector doesn't match.
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// Try to release, unless we're being deleted.
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if m.Controller.GetDeletionTimestamp() != nil {
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return false, nil
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}
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if err := release(obj); err != nil {
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// If the pod no longer exists, ignore the error.
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if errors.IsNotFound(err) {
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return false, nil
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}
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// Either someone else released it, or there was a transient error.
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// The controller should requeue and try again if it's still stale.
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return false, err
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}
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// Successfully released.
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return false, nil
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}
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// It's an orphan.
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if m.Controller.GetDeletionTimestamp() != nil || !match(obj) {
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// Ignore if we're being deleted or selector doesn't match.
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return false, nil
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}
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if obj.GetDeletionTimestamp() != nil {
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// Ignore if the object is being deleted
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return false, nil
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}
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// Selector matches. Try to adopt.
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if err := adopt(obj); err != nil {
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// If the pod no longer exists, ignore the error.
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if errors.IsNotFound(err) {
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return false, nil
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}
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// Either someone else claimed it first, or there was a transient error.
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// The controller should requeue and try again if it's still orphaned.
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return false, err
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}
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// Successfully adopted.
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return true, nil
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}
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type PodControllerRefManager struct {
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BaseControllerRefManager
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controllerKind schema.GroupVersionKind
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podControl PodControlInterface
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}
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// NewPodControllerRefManager returns a PodControllerRefManager that exposes
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// methods to manage the controllerRef of pods.
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//
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// The CanAdopt() function can be used to perform a potentially expensive check
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// (such as a live GET from the API server) prior to the first adoption.
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// It will only be called (at most once) if an adoption is actually attempted.
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// If CanAdopt() returns a non-nil error, all adoptions will fail.
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//
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// NOTE: Once CanAdopt() is called, it will not be called again by the same
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// PodControllerRefManager instance. Create a new instance if it makes
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// sense to check CanAdopt() again (e.g. in a different sync pass).
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func NewPodControllerRefManager(
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podControl PodControlInterface,
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controller metav1.Object,
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selector labels.Selector,
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controllerKind schema.GroupVersionKind,
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canAdopt func() error,
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) *PodControllerRefManager {
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return &PodControllerRefManager{
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BaseControllerRefManager: BaseControllerRefManager{
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Controller: controller,
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Selector: selector,
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CanAdoptFunc: canAdopt,
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},
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controllerKind: controllerKind,
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podControl: podControl,
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}
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}
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// ClaimPods tries to take ownership of a list of Pods.
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//
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// It will reconcile the following:
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// * Adopt orphans if the selector matches.
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// * Release owned objects if the selector no longer matches.
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//
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// Optional: If one or more filters are specified, a Pod will only be claimed if
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// all filters return true.
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//
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// A non-nil error is returned if some form of reconciliation was attempted and
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// failed. Usually, controllers should try again later in case reconciliation
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// is still needed.
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//
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// If the error is nil, either the reconciliation succeeded, or no
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// reconciliation was necessary. The list of Pods that you now own is returned.
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func (m *PodControllerRefManager) ClaimPods(pods []*v1.Pod, filters ...func(*v1.Pod) bool) ([]*v1.Pod, error) {
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var claimed []*v1.Pod
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var errlist []error
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match := func(obj metav1.Object) bool {
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pod := obj.(*v1.Pod)
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// Check selector first so filters only run on potentially matching Pods.
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if !m.Selector.Matches(labels.Set(pod.Labels)) {
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return false
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}
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for _, filter := range filters {
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if !filter(pod) {
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return false
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}
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}
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return true
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}
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adopt := func(obj metav1.Object) error {
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return m.AdoptPod(obj.(*v1.Pod))
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}
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release := func(obj metav1.Object) error {
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return m.ReleasePod(obj.(*v1.Pod))
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}
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for _, pod := range pods {
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ok, err := m.ClaimObject(pod, match, adopt, release)
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if err != nil {
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errlist = append(errlist, err)
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continue
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}
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if ok {
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claimed = append(claimed, pod)
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}
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}
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return claimed, utilerrors.NewAggregate(errlist)
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}
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// AdoptPod sends a patch to take control of the pod. It returns the error if
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// the patching fails.
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func (m *PodControllerRefManager) AdoptPod(pod *v1.Pod) error {
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if err := m.CanAdopt(); err != nil {
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return fmt.Errorf("can't adopt Pod %v/%v (%v): %v", pod.Namespace, pod.Name, pod.UID, err)
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}
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// Note that ValidateOwnerReferences() will reject this patch if another
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// OwnerReference exists with controller=true.
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addControllerPatch := fmt.Sprintf(
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`{"metadata":{"ownerReferences":[{"apiVersion":"%s","kind":"%s","name":"%s","uid":"%s","controller":true,"blockOwnerDeletion":true}],"uid":"%s"}}`,
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m.controllerKind.GroupVersion(), m.controllerKind.Kind,
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m.Controller.GetName(), m.Controller.GetUID(), pod.UID)
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return m.podControl.PatchPod(pod.Namespace, pod.Name, []byte(addControllerPatch))
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}
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// ReleasePod sends a patch to free the pod from the control of the controller.
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// It returns the error if the patching fails. 404 and 422 errors are ignored.
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func (m *PodControllerRefManager) ReleasePod(pod *v1.Pod) error {
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glog.V(2).Infof("patching pod %s_%s to remove its controllerRef to %s/%s:%s",
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pod.Namespace, pod.Name, m.controllerKind.GroupVersion(), m.controllerKind.Kind, m.Controller.GetName())
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deleteOwnerRefPatch := fmt.Sprintf(`{"metadata":{"ownerReferences":[{"$patch":"delete","uid":"%s"}],"uid":"%s"}}`, m.Controller.GetUID(), pod.UID)
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err := m.podControl.PatchPod(pod.Namespace, pod.Name, []byte(deleteOwnerRefPatch))
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if err != nil {
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if errors.IsNotFound(err) {
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// If the pod no longer exists, ignore it.
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return nil
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}
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if errors.IsInvalid(err) {
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// Invalid error will be returned in two cases: 1. the pod
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// has no owner reference, 2. the uid of the pod doesn't
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// match, which means the pod is deleted and then recreated.
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// In both cases, the error can be ignored.
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// TODO: If the pod has owner references, but none of them
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// has the owner.UID, server will silently ignore the patch.
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// Investigate why.
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return nil
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}
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}
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return err
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}
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// ReplicaSetControllerRefManager is used to manage controllerRef of ReplicaSets.
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// Three methods are defined on this object 1: Classify 2: AdoptReplicaSet and
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// 3: ReleaseReplicaSet which are used to classify the ReplicaSets into appropriate
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// categories and accordingly adopt or release them. See comments on these functions
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// for more details.
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type ReplicaSetControllerRefManager struct {
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BaseControllerRefManager
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controllerKind schema.GroupVersionKind
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rsControl RSControlInterface
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}
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// NewReplicaSetControllerRefManager returns a ReplicaSetControllerRefManager that exposes
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// methods to manage the controllerRef of ReplicaSets.
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//
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// The CanAdopt() function can be used to perform a potentially expensive check
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// (such as a live GET from the API server) prior to the first adoption.
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// It will only be called (at most once) if an adoption is actually attempted.
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// If CanAdopt() returns a non-nil error, all adoptions will fail.
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//
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// NOTE: Once CanAdopt() is called, it will not be called again by the same
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// ReplicaSetControllerRefManager instance. Create a new instance if it
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// makes sense to check CanAdopt() again (e.g. in a different sync pass).
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func NewReplicaSetControllerRefManager(
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rsControl RSControlInterface,
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controller metav1.Object,
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selector labels.Selector,
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controllerKind schema.GroupVersionKind,
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canAdopt func() error,
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) *ReplicaSetControllerRefManager {
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return &ReplicaSetControllerRefManager{
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BaseControllerRefManager: BaseControllerRefManager{
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Controller: controller,
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Selector: selector,
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CanAdoptFunc: canAdopt,
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},
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controllerKind: controllerKind,
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rsControl: rsControl,
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}
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}
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// ClaimReplicaSets tries to take ownership of a list of ReplicaSets.
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//
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// It will reconcile the following:
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// * Adopt orphans if the selector matches.
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// * Release owned objects if the selector no longer matches.
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//
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// A non-nil error is returned if some form of reconciliation was attempted and
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// failed. Usually, controllers should try again later in case reconciliation
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// is still needed.
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//
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// If the error is nil, either the reconciliation succeeded, or no
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// reconciliation was necessary. The list of ReplicaSets that you now own is
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// returned.
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func (m *ReplicaSetControllerRefManager) ClaimReplicaSets(sets []*extensions.ReplicaSet) ([]*extensions.ReplicaSet, error) {
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var claimed []*extensions.ReplicaSet
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var errlist []error
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match := func(obj metav1.Object) bool {
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return m.Selector.Matches(labels.Set(obj.GetLabels()))
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}
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adopt := func(obj metav1.Object) error {
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return m.AdoptReplicaSet(obj.(*extensions.ReplicaSet))
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}
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release := func(obj metav1.Object) error {
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return m.ReleaseReplicaSet(obj.(*extensions.ReplicaSet))
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}
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for _, rs := range sets {
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ok, err := m.ClaimObject(rs, match, adopt, release)
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if err != nil {
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errlist = append(errlist, err)
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continue
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}
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if ok {
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claimed = append(claimed, rs)
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}
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}
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return claimed, utilerrors.NewAggregate(errlist)
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}
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// AdoptReplicaSet sends a patch to take control of the ReplicaSet. It returns
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// the error if the patching fails.
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func (m *ReplicaSetControllerRefManager) AdoptReplicaSet(rs *extensions.ReplicaSet) error {
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if err := m.CanAdopt(); err != nil {
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return fmt.Errorf("can't adopt ReplicaSet %v/%v (%v): %v", rs.Namespace, rs.Name, rs.UID, err)
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}
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// Note that ValidateOwnerReferences() will reject this patch if another
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// OwnerReference exists with controller=true.
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addControllerPatch := fmt.Sprintf(
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`{"metadata":{"ownerReferences":[{"apiVersion":"%s","kind":"%s","name":"%s","uid":"%s","controller":true,"blockOwnerDeletion":true}],"uid":"%s"}}`,
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m.controllerKind.GroupVersion(), m.controllerKind.Kind,
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m.Controller.GetName(), m.Controller.GetUID(), rs.UID)
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return m.rsControl.PatchReplicaSet(rs.Namespace, rs.Name, []byte(addControllerPatch))
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}
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// ReleaseReplicaSet sends a patch to free the ReplicaSet from the control of the Deployment controller.
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// It returns the error if the patching fails. 404 and 422 errors are ignored.
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func (m *ReplicaSetControllerRefManager) ReleaseReplicaSet(replicaSet *extensions.ReplicaSet) error {
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glog.V(2).Infof("patching ReplicaSet %s_%s to remove its controllerRef to %s/%s:%s",
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replicaSet.Namespace, replicaSet.Name, m.controllerKind.GroupVersion(), m.controllerKind.Kind, m.Controller.GetName())
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deleteOwnerRefPatch := fmt.Sprintf(`{"metadata":{"ownerReferences":[{"$patch":"delete","uid":"%s"}],"uid":"%s"}}`, m.Controller.GetUID(), replicaSet.UID)
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err := m.rsControl.PatchReplicaSet(replicaSet.Namespace, replicaSet.Name, []byte(deleteOwnerRefPatch))
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if err != nil {
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if errors.IsNotFound(err) {
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// If the ReplicaSet no longer exists, ignore it.
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return nil
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}
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if errors.IsInvalid(err) {
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// Invalid error will be returned in two cases: 1. the ReplicaSet
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// has no owner reference, 2. the uid of the ReplicaSet doesn't
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// match, which means the ReplicaSet is deleted and then recreated.
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// In both cases, the error can be ignored.
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return nil
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}
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}
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return err
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}
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// RecheckDeletionTimestamp returns a CanAdopt() function to recheck deletion.
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//
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// The CanAdopt() function calls getObject() to fetch the latest value,
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// and denies adoption attempts if that object has a non-nil DeletionTimestamp.
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func RecheckDeletionTimestamp(getObject func() (metav1.Object, error)) func() error {
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return func() error {
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obj, err := getObject()
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if err != nil {
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return fmt.Errorf("can't recheck DeletionTimestamp: %v", err)
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}
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if obj.GetDeletionTimestamp() != nil {
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return fmt.Errorf("%v/%v has just been deleted at %v", obj.GetNamespace(), obj.GetName(), obj.GetDeletionTimestamp())
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}
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return nil
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}
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}
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// ControllerRevisionControllerRefManager is used to manage controllerRef of ControllerRevisions.
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// Three methods are defined on this object 1: Classify 2: AdoptControllerRevision and
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// 3: ReleaseControllerRevision which are used to classify the ControllerRevisions into appropriate
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// categories and accordingly adopt or release them. See comments on these functions
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// for more details.
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type ControllerRevisionControllerRefManager struct {
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BaseControllerRefManager
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controllerKind schema.GroupVersionKind
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crControl ControllerRevisionControlInterface
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}
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// NewControllerRevisionControllerRefManager returns a ControllerRevisionControllerRefManager that exposes
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// methods to manage the controllerRef of ControllerRevisions.
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//
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// The canAdopt() function can be used to perform a potentially expensive check
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// (such as a live GET from the API server) prior to the first adoption.
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// It will only be called (at most once) if an adoption is actually attempted.
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// If canAdopt() returns a non-nil error, all adoptions will fail.
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//
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// NOTE: Once canAdopt() is called, it will not be called again by the same
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// ControllerRevisionControllerRefManager instance. Create a new instance if it
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// makes sense to check canAdopt() again (e.g. in a different sync pass).
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func NewControllerRevisionControllerRefManager(
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crControl ControllerRevisionControlInterface,
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controller metav1.Object,
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selector labels.Selector,
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controllerKind schema.GroupVersionKind,
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canAdopt func() error,
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) *ControllerRevisionControllerRefManager {
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return &ControllerRevisionControllerRefManager{
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BaseControllerRefManager: BaseControllerRefManager{
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Controller: controller,
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Selector: selector,
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CanAdoptFunc: canAdopt,
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},
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controllerKind: controllerKind,
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crControl: crControl,
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}
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}
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// ClaimControllerRevisions tries to take ownership of a list of ControllerRevisions.
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//
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// It will reconcile the following:
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// * Adopt orphans if the selector matches.
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// * Release owned objects if the selector no longer matches.
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//
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// A non-nil error is returned if some form of reconciliation was attempted and
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// failed. Usually, controllers should try again later in case reconciliation
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// is still needed.
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//
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// If the error is nil, either the reconciliation succeeded, or no
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// reconciliation was necessary. The list of ControllerRevisions that you now own is
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// returned.
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func (m *ControllerRevisionControllerRefManager) ClaimControllerRevisions(histories []*appsv1beta1.ControllerRevision) ([]*appsv1beta1.ControllerRevision, error) {
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var claimed []*appsv1beta1.ControllerRevision
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var errlist []error
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match := func(obj metav1.Object) bool {
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return m.Selector.Matches(labels.Set(obj.GetLabels()))
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}
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adopt := func(obj metav1.Object) error {
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return m.AdoptControllerRevision(obj.(*appsv1beta1.ControllerRevision))
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}
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release := func(obj metav1.Object) error {
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return m.ReleaseControllerRevision(obj.(*appsv1beta1.ControllerRevision))
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}
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for _, h := range histories {
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ok, err := m.ClaimObject(h, match, adopt, release)
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if err != nil {
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errlist = append(errlist, err)
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continue
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}
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if ok {
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claimed = append(claimed, h)
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}
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}
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return claimed, utilerrors.NewAggregate(errlist)
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}
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// AdoptControllerRevision sends a patch to take control of the ControllerRevision. It returns the error if
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// the patching fails.
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func (m *ControllerRevisionControllerRefManager) AdoptControllerRevision(history *appsv1beta1.ControllerRevision) error {
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if err := m.CanAdopt(); err != nil {
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return fmt.Errorf("can't adopt ControllerRevision %v/%v (%v): %v", history.Namespace, history.Name, history.UID, err)
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}
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// Note that ValidateOwnerReferences() will reject this patch if another
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|
// OwnerReference exists with controller=true.
|
|
addControllerPatch := fmt.Sprintf(
|
|
`{"metadata":{"ownerReferences":[{"apiVersion":"%s","kind":"%s","name":"%s","uid":"%s","controller":true,"blockOwnerDeletion":true}],"uid":"%s"}}`,
|
|
m.controllerKind.GroupVersion(), m.controllerKind.Kind,
|
|
m.Controller.GetName(), m.Controller.GetUID(), history.UID)
|
|
return m.crControl.PatchControllerRevision(history.Namespace, history.Name, []byte(addControllerPatch))
|
|
}
|
|
|
|
// ReleaseControllerRevision sends a patch to free the ControllerRevision from the control of its controller.
|
|
// It returns the error if the patching fails. 404 and 422 errors are ignored.
|
|
func (m *ControllerRevisionControllerRefManager) ReleaseControllerRevision(history *appsv1beta1.ControllerRevision) error {
|
|
glog.V(2).Infof("patching ControllerRevision %s_%s to remove its controllerRef to %s/%s:%s",
|
|
history.Namespace, history.Name, m.controllerKind.GroupVersion(), m.controllerKind.Kind, m.Controller.GetName())
|
|
deleteOwnerRefPatch := fmt.Sprintf(`{"metadata":{"ownerReferences":[{"$patch":"delete","uid":"%s"}],"uid":"%s"}}`, m.Controller.GetUID(), history.UID)
|
|
err := m.crControl.PatchControllerRevision(history.Namespace, history.Name, []byte(deleteOwnerRefPatch))
|
|
if err != nil {
|
|
if errors.IsNotFound(err) {
|
|
// If the ControllerRevision no longer exists, ignore it.
|
|
return nil
|
|
}
|
|
if errors.IsInvalid(err) {
|
|
// Invalid error will be returned in two cases: 1. the ControllerRevision
|
|
// has no owner reference, 2. the uid of the ControllerRevision doesn't
|
|
// match, which means the ControllerRevision is deleted and then recreated.
|
|
// In both cases, the error can be ignored.
|
|
return nil
|
|
}
|
|
}
|
|
return err
|
|
}
|