mirror of https://github.com/k3s-io/k3s
111 lines
4.0 KiB
Go
111 lines
4.0 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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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 replicaset
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import (
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"fmt"
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"time"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/apis/extensions"
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unversionedextensions "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/extensions/unversioned"
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"k8s.io/kubernetes/pkg/labels"
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errorsutil "k8s.io/kubernetes/pkg/util/errors"
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labelsutil "k8s.io/kubernetes/pkg/util/labels"
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podutil "k8s.io/kubernetes/pkg/util/pod"
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"k8s.io/kubernetes/pkg/util/wait"
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)
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// TODO: use client library instead when it starts to support update retries
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// see https://github.com/kubernetes/kubernetes/issues/21479
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type updateRSFunc func(rs *extensions.ReplicaSet) error
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// UpdateRSWithRetries updates a RS with given applyUpdate function. Note that RS not found error is ignored.
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// The returned bool value can be used to tell if the RS is actually updated.
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func UpdateRSWithRetries(rsClient unversionedextensions.ReplicaSetInterface, rs *extensions.ReplicaSet, applyUpdate updateRSFunc) (*extensions.ReplicaSet, bool, error) {
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var err error
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var rsUpdated bool
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oldRs := rs
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if err = wait.Poll(10*time.Millisecond, 1*time.Minute, func() (bool, error) {
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rs, err = rsClient.Get(oldRs.Name)
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if err != nil {
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return false, err
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}
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// Apply the update, then attempt to push it to the apiserver.
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if err = applyUpdate(rs); err != nil {
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return false, err
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}
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if rs, err = rsClient.Update(rs); err == nil {
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// Update successful.
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return true, nil
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}
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// TODO: don't retry on perm-failed errors and handle them gracefully
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// Update could have failed due to conflict error. Try again.
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return false, nil
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}); err == nil {
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// When there's no error, we've updated this RS.
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rsUpdated = true
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}
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// Handle returned error from wait poll
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if err == wait.ErrWaitTimeout {
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err = fmt.Errorf("timed out trying to update RS: %+v", oldRs)
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}
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// Ignore the RS not found error, but the RS isn't updated.
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if errors.IsNotFound(err) {
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glog.V(4).Infof("%s %s/%s is not found, skip updating it.", oldRs.Kind, oldRs.Namespace, oldRs.Name)
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err = nil
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}
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// Ignore the precondition violated error, but the RS isn't updated.
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if err == errorsutil.ErrPreconditionViolated {
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glog.V(4).Infof("%s %s/%s precondition doesn't hold, skip updating it.", oldRs.Kind, oldRs.Namespace, oldRs.Name)
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err = nil
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}
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// If the error is non-nil the returned RS cannot be trusted; if rsUpdated is false, the contoller isn't updated;
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// if the error is nil and rsUpdated is true, the returned RS contains the applied update.
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return rs, rsUpdated, err
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}
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// GetPodTemplateSpecHash returns the pod template hash of a ReplicaSet's pod template space
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func GetPodTemplateSpecHash(rs extensions.ReplicaSet) string {
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meta := rs.Spec.Template.ObjectMeta
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meta.Labels = labelsutil.CloneAndRemoveLabel(meta.Labels, extensions.DefaultDeploymentUniqueLabelKey)
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return fmt.Sprintf("%d", podutil.GetPodTemplateSpecHash(api.PodTemplateSpec{
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ObjectMeta: meta,
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Spec: rs.Spec.Template.Spec,
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}))
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}
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// MatchingPodsFunc returns a filter function for pods with matching labels
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func MatchingPodsFunc(rs *extensions.ReplicaSet) (func(api.Pod) bool, error) {
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if rs == nil {
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return nil, nil
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}
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selector, err := unversioned.LabelSelectorAsSelector(rs.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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return func(pod api.Pod) bool {
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podLabelsSelector := labels.Set(pod.ObjectMeta.Labels)
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return selector.Matches(podLabelsSelector)
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}, nil
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}
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