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upgrade.go
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upgrade.go
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/*
Copyright The Helm Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package action
import (
"bytes"
"flag"
"fmt"
"strings"
"time"
"github.com/hinfinite/helm/pkg/agent/action"
v1 "k8s.io/api/core/v1"
"github.com/pkg/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/cli-runtime/pkg/resource"
"github.com/hinfinite/helm/pkg/chart"
"github.com/hinfinite/helm/pkg/chartutil"
"github.com/hinfinite/helm/pkg/kube"
"github.com/hinfinite/helm/pkg/postrender"
"github.com/hinfinite/helm/pkg/release"
"github.com/hinfinite/helm/pkg/releaseutil"
)
// Upgrade is the action for upgrading releases.
//
// It provides the implementation of 'helm upgrade'.
var maxHistory int
func init() {
flag.IntVar(&maxHistory, "helm-max-history", 3, "limit helm release history count")
}
type Upgrade struct {
cfg *Configuration
ChartPathOptions
Install bool
Devel bool
Namespace string
// SkipCRDs skip installing CRDs when install flag is enabled during upgrade
SkipCRDs bool
Timeout time.Duration
Wait bool
WaitForJobs bool
DisableHooks bool
DryRun bool
Force bool
ResetValues bool
ReuseValues bool
// Recreate will (if true) recreate pods after a rollback.
Recreate bool
// MaxHistory limits the maximum number of revisions saved per release
MaxHistory int
Atomic bool
CleanupOnFail bool
SubNotes bool
Description string
PostRenderer postrender.PostRenderer
DisableOpenAPIValidation bool
ReleaseName string
Commit string
ImagePullSecret []v1.LocalObjectReference
ChartName string
ChartVersion string
ClusterCode string
AgentVersion string
DoCallbackReleaseHandler func(string, *release.Release)
}
// NewUpgrade creates a new Upgrade object with the given configuration.
func NewUpgrade(cfg *Configuration,
chartPathOptions ChartPathOptions,
commit string,
imagePullSecret []v1.LocalObjectReference,
ReleaseName string,
chartName string,
chartVersion string,
clusterCode string,
agentVersion string,
reuseValues bool,
doCallbackReleaseHandler func(string, *release.Release)) *Upgrade {
return &Upgrade{
ChartPathOptions: chartPathOptions,
cfg: cfg,
Commit: commit,
ImagePullSecret: imagePullSecret,
ReleaseName: ReleaseName,
ChartName: chartName,
ChartVersion: chartVersion,
ClusterCode: clusterCode,
AgentVersion: agentVersion,
MaxHistory: maxHistory,
ReuseValues: reuseValues,
DoCallbackReleaseHandler: doCallbackReleaseHandler,
}
}
// Run executes the upgrade on the given release.
func (u *Upgrade) Run(name string, chart *chart.Chart, vals map[string]interface{}, valuesRaw string) (*release.Release, error) {
if err := u.cfg.KubeClient.IsReachable(); err != nil {
return nil, err
}
// Make sure if Atomic is set, that wait is set as well. This makes it so
// the user doesn't have to specify both
u.Wait = u.Wait || u.Atomic
if err := validateReleaseName(name); err != nil {
return nil, errors.Errorf("release name is invalid: %s", name)
}
u.cfg.Log("preparing upgrade for %s", name)
currentRelease, upgradedRelease, err := u.prepareUpgrade(name, chart, vals, valuesRaw)
if err != nil {
return nil, err
}
u.cfg.Releases.MaxHistory = u.MaxHistory
u.cfg.Log("performing update for %s", name)
res, err := u.performUpgrade(currentRelease, upgradedRelease)
if err != nil {
return res, err
}
if !u.DryRun {
u.cfg.Log("updating status for upgraded release for %s", name)
if err := u.cfg.Releases.Update(upgradedRelease); err != nil {
return res, err
}
}
return res, nil
}
func validateReleaseName(releaseName string) error {
if releaseName == "" {
return errMissingRelease
}
if !ValidName.MatchString(releaseName) || (len(releaseName) > releaseNameMaxLen) {
return errInvalidName
}
return nil
}
// prepareUpgrade builds an upgraded release for an upgrade operation.
func (u *Upgrade) prepareUpgrade(name string, chart *chart.Chart, vals map[string]interface{}, valuesRaw string) (*release.Release, *release.Release, error) {
if chart == nil {
return nil, nil, errMissingChart
}
// finds the installed release with the given name
currentRelease, err := u.cfg.Releases.Installed(name)
if err != nil {
return nil, nil, err
}
// determine if values will be reused
vals, err = u.reuseValues(chart, currentRelease, vals)
if err != nil {
return nil, nil, err
}
if err := chartutil.ProcessDependencies(chart, vals); err != nil {
return nil, nil, err
}
// finds the non-deleted release with the given name
lastRelease, err := u.cfg.Releases.Last(name)
if err != nil {
return nil, nil, err
}
// Increment revision count. This is passed to templates, and also stored on
// the release object.
revision := lastRelease.Version + 1
options := chartutil.ReleaseOptions{
Name: name,
Namespace: currentRelease.Namespace,
Revision: revision,
IsUpgrade: true,
}
caps, err := u.cfg.getCapabilities()
if err != nil {
return nil, nil, err
}
valuesToRender, err := chartutil.ToRenderValues(chart, vals, options, caps)
if err != nil {
return nil, nil, err
}
var resourceChartMap map[string]string
hooks, manifestDoc, resourceChartMap, notesTxt, err := u.cfg.renderResources(chart, valuesToRender, "", "", u.SubNotes, false, false, u.PostRenderer)
if err != nil {
return nil, nil, err
}
// Store an upgraded release.
upgradedRelease := &release.Release{
Name: name,
Namespace: currentRelease.Namespace,
Chart: chart,
Config: vals,
ConfigRaw: valuesRaw,
Info: &release.Info{
FirstDeployed: currentRelease.Info.FirstDeployed,
LastDeployed: Timestamper(),
Status: release.StatusPendingUpgrade,
Description: "Preparing upgrade", // This should be overwritten later.
},
Version: revision,
Manifest: manifestDoc.String(),
Hooks: hooks,
ResourceChartMap: resourceChartMap,
}
//同一个chart,Resource和Chart的对应关系应该是不会变化的,故不用单独再去构造
currentRelease.ResourceChartMap = resourceChartMap
if len(notesTxt) > 0 {
upgradedRelease.Info.Notes = notesTxt
}
err = validateManifest(u.cfg.KubeClient, manifestDoc.Bytes(), !u.DisableOpenAPIValidation)
return currentRelease, upgradedRelease, err
}
func (u *Upgrade) performUpgrade(originalRelease, upgradedRelease *release.Release) (*release.Release, error) {
current, err := u.cfg.KubeClient.Build(bytes.NewBufferString(originalRelease.Manifest), false)
if err != nil {
return upgradedRelease, errors.Wrap(err, "unable to build kubernetes objects from current release manifest")
}
target, err := u.cfg.KubeClient.Build(bytes.NewBufferString(upgradedRelease.Manifest), !u.DisableOpenAPIValidation)
// 如果是agent升级,则跳过添加标签这一步,因为agent原本是直接在集群中安装的没有对应标签,如果在这里加标签k8s会报错
if u.ChartName != "hskp-devops-cluster-agent" {
// 在这里对要新chart包中的对象添加标签
for _, r := range target {
customLabelOnChart := upgradedRelease.GetCustomLabelOnChart(r.Mapping.GroupVersionKind.Kind, r.Name)
customSelectorLabelOnChart := upgradedRelease.GetCustomSelectorLabelOnChar(r.Mapping.GroupVersionKind.Kind, r.Name)
customLabelOnResource := upgradedRelease.GetCustomLabelOnResource(r.Mapping.GroupVersionKind.Kind, r.Name)
commonLabelOnChart := upgradedRelease.GetCommonLabelOnChart(r.Mapping.GroupVersionKind.Kind, r.Name)
err = action.AddLabel(u.ImagePullSecret, u.ClusterCode, r, u.Commit, u.ChartVersion, u.ReleaseName, u.ChartName, u.AgentVersion, originalRelease.Namespace, true, u.cfg.ClientSet, customLabelOnChart, customSelectorLabelOnChart, customLabelOnResource, commonLabelOnChart, false)
if err != nil {
return nil, err
}
}
for _, c := range current {
customLabelOnChart := originalRelease.GetCustomLabelOnChart(c.Mapping.GroupVersionKind.Kind, c.Name)
customSelectorLabelOnChart := originalRelease.GetCustomSelectorLabelOnChar(c.Mapping.GroupVersionKind.Kind, c.Name)
customLabelOnResource := originalRelease.GetCustomLabelOnResource(c.Mapping.GroupVersionKind.Kind, c.Name)
commonLabelOnChart := originalRelease.GetCommonLabelOnChart(c.Mapping.GroupVersionKind.Kind, c.Name)
err = action.AddLabel(u.ImagePullSecret, u.ClusterCode, c, u.Commit, u.ChartVersion, u.ReleaseName, u.ChartName, u.AgentVersion, originalRelease.Namespace, true, u.cfg.ClientSet, customLabelOnChart, customSelectorLabelOnChart, customLabelOnResource, commonLabelOnChart, true)
if err != nil {
return nil, err
}
}
}
if err != nil {
return upgradedRelease, errors.Wrap(err, "unable to build kubernetes objects from new release manifest")
}
// It is safe to use force only on target because these are resources currently rendered by the chart.
err = target.Visit(setMetadataVisitor(upgradedRelease.Name, upgradedRelease.Namespace, true))
if err != nil {
return upgradedRelease, err
}
// Do a basic diff using gvk + name to figure out what new resources are being created so we can validate they don't already exist
existingResources := make(map[string]bool)
for _, r := range current {
existingResources[objectKey(r)] = true
}
var toBeCreated kube.ResourceList
for _, r := range target {
if !existingResources[objectKey(r)] {
toBeCreated = append(toBeCreated, r)
}
}
toBeUpdated, err := existingResourceConflict(toBeCreated, upgradedRelease.Name, upgradedRelease.Namespace)
if err != nil {
return nil, errors.Wrap(err, "rendered manifests contain a resource that already exists. Unable to continue with update")
}
toBeUpdated.Visit(func(r *resource.Info, err error) error {
if err != nil {
return err
}
current.Append(r)
return nil
})
if u.DryRun {
u.cfg.Log("dry run for %s", upgradedRelease.Name)
if len(u.Description) > 0 {
upgradedRelease.Info.Description = u.Description
} else {
upgradedRelease.Info.Description = "Dry run complete"
}
return upgradedRelease, nil
}
u.cfg.Log("creating upgraded release for %s", upgradedRelease.Name)
if err := u.cfg.Releases.Create(upgradedRelease); err != nil {
return nil, err
}
// pre-upgrade hooks
if !u.DisableHooks {
if err := u.cfg.execHook(upgradedRelease, release.HookPreUpgrade, u.Timeout, u.ImagePullSecret, u.ClusterCode, u.Commit, u.ChartVersion, u.ReleaseName, u.ChartName, u.AgentVersion, originalRelease.Namespace); err != nil {
return u.failRelease(upgradedRelease, kube.ResourceList{}, fmt.Errorf("pre-upgrade hooks failed: %s", err))
}
} else {
u.cfg.Log("upgrade hooks disabled for %s", upgradedRelease.Name)
}
results, err := u.cfg.KubeClient.Update(current, target, u.Force)
if err != nil {
u.cfg.recordRelease(originalRelease)
return u.failRelease(upgradedRelease, results.Created, err)
}
if u.Recreate {
// NOTE: Because this is not critical for a release to succeed, we just
// log if an error occurs and continue onward. If we ever introduce log
// levels, we should make these error level logs so users are notified
// that they'll need to go do the cleanup on their own
if err := recreate(u.cfg, results.Updated); err != nil {
u.cfg.Log(err.Error())
}
}
// 上报操作状态成功
if u.DoCallbackReleaseHandler != nil {
u.DoCallbackReleaseHandler(release.OperateStatusCallBack, upgradedRelease)
}
if u.Wait {
if u.WaitForJobs {
if err := u.cfg.KubeClient.WaitWithJobs(target, u.Timeout); err != nil {
u.cfg.recordRelease(originalRelease)
return u.failRelease(upgradedRelease, results.Created, err)
}
} else {
if err := u.cfg.KubeClient.Wait(target, u.Timeout); err != nil {
u.cfg.recordRelease(originalRelease)
return u.failRelease(upgradedRelease, results.Created, err)
}
}
}
// post-upgrade hooks
if !u.DisableHooks {
if err := u.cfg.execHook(upgradedRelease, release.HookPostUpgrade, u.Timeout, u.ImagePullSecret, u.ClusterCode, u.Commit, u.ChartVersion, u.ReleaseName, u.ChartName, u.AgentVersion, originalRelease.Namespace); err != nil {
return u.failRelease(upgradedRelease, results.Created, fmt.Errorf("post-upgrade hooks failed: %s", err))
}
}
originalRelease.Info.Status = release.StatusSuperseded
u.cfg.recordRelease(originalRelease)
upgradedRelease.Info.Status = release.StatusDeployed
if len(u.Description) > 0 {
upgradedRelease.Info.Description = u.Description
} else {
upgradedRelease.Info.Description = "Upgrade complete"
}
return upgradedRelease, nil
}
func (u *Upgrade) failRelease(rel *release.Release, created kube.ResourceList, err error) (*release.Release, error) {
msg := fmt.Sprintf("Upgrade %q failed: %s", rel.Name, err)
u.cfg.Log("warning: %s", msg)
rel.Info.Status = release.StatusFailed
rel.Info.Description = msg
u.cfg.recordRelease(rel)
if u.CleanupOnFail && len(created) > 0 {
u.cfg.Log("Cleanup on fail set, cleaning up %d resources", len(created))
_, errs := u.cfg.KubeClient.Delete(created)
if errs != nil {
var errorList []string
for _, e := range errs {
errorList = append(errorList, e.Error())
}
return rel, errors.Wrapf(fmt.Errorf("unable to cleanup resources: %s", strings.Join(errorList, ", ")), "an error occurred while cleaning up resources. original upgrade error: %s", err)
}
u.cfg.Log("Resource cleanup complete")
}
if u.Atomic {
u.cfg.Log("Upgrade failed and atomic is set, rolling back to last successful release")
// As a protection, get the last successful release before rollback.
// If there are no successful releases, bail out
hist := NewHistory(u.cfg)
fullHistory, herr := hist.Run(rel.Name)
if herr != nil {
return rel, errors.Wrapf(herr, "an error occurred while finding last successful release. original upgrade error: %s", err)
}
// There isn't a way to tell if a previous release was successful, but
// generally failed releases do not get superseded unless the next
// release is successful, so this should be relatively safe
filteredHistory := releaseutil.FilterFunc(func(r *release.Release) bool {
return r.Info.Status == release.StatusSuperseded || r.Info.Status == release.StatusDeployed
}).Filter(fullHistory)
if len(filteredHistory) == 0 {
return rel, errors.Wrap(err, "unable to find a previously successful release when attempting to rollback. original upgrade error")
}
releaseutil.Reverse(filteredHistory, releaseutil.SortByRevision)
rollin := NewRollback(u.cfg)
rollin.Version = filteredHistory[0].Version
rollin.Wait = true
rollin.DisableHooks = u.DisableHooks
rollin.Recreate = u.Recreate
rollin.Force = u.Force
rollin.Timeout = u.Timeout
if rollErr := rollin.Run(rel.Name); rollErr != nil {
return rel, errors.Wrapf(rollErr, "an error occurred while rolling back the release. original upgrade error: %s", err)
}
return rel, errors.Wrapf(err, "release %s failed, and has been rolled back due to atomic being set", rel.Name)
}
return rel, err
}
// reuseValues copies values from the current release to a new release if the
// new release does not have any values.
//
// If the request already has values, or if there are no values in the current
// release, this does nothing.
//
// This is skipped if the u.ResetValues flag is set, in which case the
// request values are not altered.
func (u *Upgrade) reuseValues(chart *chart.Chart, current *release.Release, newVals map[string]interface{}) (map[string]interface{}, error) {
if u.ResetValues {
// If ResetValues is set, we completely ignore current.Config.
u.cfg.Log("resetting values to the chart's original version")
return newVals, nil
}
// If the ReuseValues flag is set, we always copy the old values over the new config's values.
if u.ReuseValues {
u.cfg.Log("reusing the old release's values")
// We have to regenerate the old coalesced values:
oldVals, err := chartutil.CoalesceValues(current.Chart, current.Config)
if err != nil {
return nil, errors.Wrap(err, "failed to rebuild old values")
}
newVals = chartutil.CoalesceTables(newVals, current.Config)
chart.Values = oldVals
return newVals, nil
}
if len(newVals) == 0 && len(current.Config) > 0 {
u.cfg.Log("copying values from %s (v%d) to new release.", current.Name, current.Version)
newVals = current.Config
}
return newVals, nil
}
func validateManifest(c kube.Interface, manifest []byte, openAPIValidation bool) error {
_, err := c.Build(bytes.NewReader(manifest), openAPIValidation)
return err
}
// recreate captures all the logic for recreating pods for both upgrade and
// rollback. If we end up refactoring rollback to use upgrade, this can just be
// made an unexported method on the upgrade action.
func recreate(cfg *Configuration, resources kube.ResourceList) error {
for _, res := range resources {
versioned := kube.AsVersioned(res)
selector, err := kube.SelectorsForObject(versioned)
if err != nil {
// If no selector is returned, it means this object is
// definitely not a pod, so continue onward
continue
}
client, err := cfg.KubernetesClientSet()
if err != nil {
return errors.Wrapf(err, "unable to recreate pods for object %s/%s because an error occurred", res.Namespace, res.Name)
}
pods, err := client.CoreV1().Pods(res.Namespace).List(metav1.ListOptions{
LabelSelector: selector.String(),
})
if err != nil {
return errors.Wrapf(err, "unable to recreate pods for object %s/%s because an error occurred", res.Namespace, res.Name)
}
// Restart pods
for _, pod := range pods.Items {
// Delete each pod for get them restarted with changed spec.
if err := client.CoreV1().Pods(pod.Namespace).Delete(pod.Name, metav1.NewPreconditionDeleteOptions(string(pod.UID))); err != nil {
return errors.Wrapf(err, "unable to recreate pods for object %s/%s because an error occurred", res.Namespace, res.Name)
}
}
}
return nil
}
func objectKey(r *resource.Info) string {
gvk := r.Object.GetObjectKind().GroupVersionKind()
return fmt.Sprintf("%s/%s/%s/%s", gvk.GroupVersion().String(), gvk.Kind, r.Namespace, r.Name)
}