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227 lines
6.8 KiB
227 lines
6.8 KiB
/*
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Copyright The Helm 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 action
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import (
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"bytes"
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"fmt"
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"strings"
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"time"
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"github.com/pkg/errors"
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"helm.sh/helm/v3/pkg/release"
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)
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// Rollback is the action for rolling back to a given release.
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//
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// It provides the implementation of 'helm rollback'.
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type Rollback struct {
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cfg *Configuration
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Version int
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Timeout time.Duration
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Wait bool
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DisableHooks bool
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DryRun bool
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Recreate bool // will (if true) recreate pods after a rollback.
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Force bool // will (if true) force resource upgrade through uninstall/recreate if needed
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CleanupOnFail bool
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}
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// NewRollback creates a new Rollback object with the given configuration.
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func NewRollback(cfg *Configuration) *Rollback {
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return &Rollback{
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cfg: cfg,
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}
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}
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// Run executes 'helm rollback' against the given release.
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func (r *Rollback) Run(name string) error {
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if err := r.cfg.KubeClient.IsReachable(); err != nil {
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return err
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}
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r.cfg.Log("preparing rollback of %s", name)
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currentRelease, targetRelease, err := r.prepareRollback(name)
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if err != nil {
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return err
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}
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if !r.DryRun {
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r.cfg.Log("creating rolled back release for %s", name)
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if err := r.cfg.Releases.Create(targetRelease); err != nil {
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return err
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}
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}
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r.cfg.Log("performing rollback of %s", name)
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if _, err := r.performRollback(currentRelease, targetRelease); err != nil {
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return err
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}
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if !r.DryRun {
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r.cfg.Log("updating status for rolled back release for %s", name)
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if err := r.cfg.Releases.Update(targetRelease); err != nil {
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return err
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}
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}
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return nil
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}
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// prepareRollback finds the previous release and prepares a new release object with
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// the previous release's configuration
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func (r *Rollback) prepareRollback(name string) (*release.Release, *release.Release, error) {
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if err := validateReleaseName(name); err != nil {
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return nil, nil, errors.Errorf("prepareRollback: Release name is invalid: %s", name)
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}
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if r.Version < 0 {
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return nil, nil, errInvalidRevision
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}
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currentRelease, err := r.cfg.Releases.Last(name)
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if err != nil {
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return nil, nil, err
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}
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previousVersion := r.Version
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if r.Version == 0 {
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previousVersion = currentRelease.Version - 1
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}
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r.cfg.Log("rolling back %s (current: v%d, target: v%d)", name, currentRelease.Version, previousVersion)
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previousRelease, err := r.cfg.Releases.Get(name, previousVersion)
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if err != nil {
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return nil, nil, err
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}
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// Store a new release object with previous release's configuration
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targetRelease := &release.Release{
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Name: name,
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Namespace: currentRelease.Namespace,
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Chart: previousRelease.Chart,
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Config: previousRelease.Config,
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Info: &release.Info{
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FirstDeployed: currentRelease.Info.FirstDeployed,
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LastDeployed: time.Now(),
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Status: release.StatusPendingRollback,
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Notes: previousRelease.Info.Notes,
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// Because we lose the reference to previous version elsewhere, we set the
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// message here, and only override it later if we experience failure.
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Description: fmt.Sprintf("Rollback to %d", previousVersion),
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},
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Version: currentRelease.Version + 1,
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Manifest: previousRelease.Manifest,
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Hooks: previousRelease.Hooks,
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}
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return currentRelease, targetRelease, nil
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}
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func (r *Rollback) performRollback(currentRelease, targetRelease *release.Release) (*release.Release, error) {
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if r.DryRun {
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r.cfg.Log("dry run for %s", targetRelease.Name)
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return targetRelease, nil
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}
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current, err := r.cfg.KubeClient.Build(bytes.NewBufferString(currentRelease.Manifest))
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if err != nil {
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return targetRelease, errors.Wrap(err, "unable to build kubernetes objects from current release manifest")
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}
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target, err := r.cfg.KubeClient.Build(bytes.NewBufferString(targetRelease.Manifest))
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if err != nil {
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return targetRelease, errors.Wrap(err, "unable to build kubernetes objects from new release manifest")
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}
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// pre-rollback hooks
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if !r.DisableHooks {
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if err := r.cfg.execHook(targetRelease, release.HookPreRollback, r.Timeout); err != nil {
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return targetRelease, err
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}
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} else {
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r.cfg.Log("rollback hooks disabled for %s", targetRelease.Name)
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}
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results, err := r.cfg.KubeClient.Update(current, target, r.Force)
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if err != nil {
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msg := fmt.Sprintf("Rollback %q failed: %s", targetRelease.Name, err)
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r.cfg.Log("warning: %s", msg)
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currentRelease.Info.Status = release.StatusSuperseded
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targetRelease.Info.Status = release.StatusFailed
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targetRelease.Info.Description = msg
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r.cfg.recordRelease(currentRelease)
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r.cfg.recordRelease(targetRelease)
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if r.CleanupOnFail {
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r.cfg.Log("Cleanup on fail set, cleaning up %d resources", len(results.Created))
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_, errs := r.cfg.KubeClient.Delete(results.Created)
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if errs != nil {
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var errorList []string
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for _, e := range errs {
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errorList = append(errorList, e.Error())
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}
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return targetRelease, errors.Wrapf(fmt.Errorf("unable to cleanup resources: %s", strings.Join(errorList, ", ")), "an error occurred while cleaning up resources. original rollback error: %s", err)
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}
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r.cfg.Log("Resource cleanup complete")
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}
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return targetRelease, err
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}
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if r.Recreate {
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// NOTE: Because this is not critical for a release to succeed, we just
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// log if an error occurs and continue onward. If we ever introduce log
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// levels, we should make these error level logs so users are notified
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// that they'll need to go do the cleanup on their own
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if err := recreate(r.cfg, results.Updated); err != nil {
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r.cfg.Log(err.Error())
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}
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}
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if r.Wait {
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if err := r.cfg.KubeClient.Wait(target, r.Timeout); err != nil {
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targetRelease.SetStatus(release.StatusFailed, fmt.Sprintf("Release %q failed: %s", targetRelease.Name, err.Error()))
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r.cfg.recordRelease(currentRelease)
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r.cfg.recordRelease(targetRelease)
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return targetRelease, errors.Wrapf(err, "release %s failed", targetRelease.Name)
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}
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}
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// post-rollback hooks
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if !r.DisableHooks {
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if err := r.cfg.execHook(targetRelease, release.HookPostRollback, r.Timeout); err != nil {
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return targetRelease, err
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}
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}
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deployed, err := r.cfg.Releases.DeployedAll(currentRelease.Name)
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if err != nil {
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return nil, err
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}
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// Supersede all previous deployments, see issue #2941.
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for _, rel := range deployed {
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r.cfg.Log("superseding previous deployment %d", rel.Version)
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rel.Info.Status = release.StatusSuperseded
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r.cfg.recordRelease(rel)
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}
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targetRelease.Info.Status = release.StatusDeployed
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return targetRelease, nil
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}
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