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helm/pkg/action/rollback.go

227 lines
6.8 KiB

/*
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"
"fmt"
"strings"
"time"
"github.com/pkg/errors"
"helm.sh/helm/pkg/release"
)
// Rollback is the action for rolling back to a given release.
//
// It provides the implementation of 'helm rollback'.
type Rollback struct {
cfg *Configuration
Version int
Timeout time.Duration
Wait bool
DisableHooks bool
DryRun bool
Recreate bool // will (if true) recreate pods after a rollback.
Force bool // will (if true) force resource upgrade through uninstall/recreate if needed
CleanupOnFail bool
}
// NewRollback creates a new Rollback object with the given configuration.
func NewRollback(cfg *Configuration) *Rollback {
return &Rollback{
cfg: cfg,
}
}
// Run executes 'helm rollback' against the given release.
func (r *Rollback) Run(name string) error {
if err := r.cfg.KubeClient.IsReachable(); err != nil {
return err
}
r.cfg.Log("preparing rollback of %s", name)
currentRelease, targetRelease, err := r.prepareRollback(name)
if err != nil {
return err
}
if !r.DryRun {
r.cfg.Log("creating rolled back release for %s", name)
if err := r.cfg.Releases.Create(targetRelease); err != nil {
return err
}
}
r.cfg.Log("performing rollback of %s", name)
if _, err := r.performRollback(currentRelease, targetRelease); err != nil {
return err
}
if !r.DryRun {
r.cfg.Log("updating status for rolled back release for %s", name)
if err := r.cfg.Releases.Update(targetRelease); err != nil {
return err
}
}
return nil
}
// prepareRollback finds the previous release and prepares a new release object with
// the previous release's configuration
func (r *Rollback) prepareRollback(name string) (*release.Release, *release.Release, error) {
if err := validateReleaseName(name); err != nil {
return nil, nil, errors.Errorf("prepareRollback: Release name is invalid: %s", name)
}
if r.Version < 0 {
return nil, nil, errInvalidRevision
}
currentRelease, err := r.cfg.Releases.Last(name)
if err != nil {
return nil, nil, err
}
previousVersion := r.Version
if r.Version == 0 {
previousVersion = currentRelease.Version - 1
}
r.cfg.Log("rolling back %s (current: v%d, target: v%d)", name, currentRelease.Version, previousVersion)
previousRelease, err := r.cfg.Releases.Get(name, previousVersion)
if err != nil {
return nil, nil, err
}
// Store a new release object with previous release's configuration
targetRelease := &release.Release{
Name: name,
Namespace: currentRelease.Namespace,
Chart: previousRelease.Chart,
Config: previousRelease.Config,
Info: &release.Info{
FirstDeployed: currentRelease.Info.FirstDeployed,
LastDeployed: time.Now(),
Status: release.StatusPendingRollback,
Notes: previousRelease.Info.Notes,
// Because we lose the reference to previous version elsewhere, we set the
// message here, and only override it later if we experience failure.
Description: fmt.Sprintf("Rollback to %d", previousVersion),
},
Version: currentRelease.Version + 1,
Manifest: previousRelease.Manifest,
Hooks: previousRelease.Hooks,
}
return currentRelease, targetRelease, nil
}
func (r *Rollback) performRollback(currentRelease, targetRelease *release.Release) (*release.Release, error) {
if r.DryRun {
r.cfg.Log("dry run for %s", targetRelease.Name)
return targetRelease, nil
}
current, err := r.cfg.KubeClient.Build(bytes.NewBufferString(currentRelease.Manifest))
if err != nil {
return targetRelease, errors.Wrap(err, "unable to build kubernetes objects from current release manifest")
}
target, err := r.cfg.KubeClient.Build(bytes.NewBufferString(targetRelease.Manifest))
if err != nil {
return targetRelease, errors.Wrap(err, "unable to build kubernetes objects from new release manifest")
}
// pre-rollback hooks
if !r.DisableHooks {
if err := r.cfg.execHook(targetRelease, release.HookPreRollback, r.Timeout); err != nil {
return targetRelease, err
}
} else {
r.cfg.Log("rollback hooks disabled for %s", targetRelease.Name)
}
results, err := r.cfg.KubeClient.Update(current, target, r.Force)
if err != nil {
msg := fmt.Sprintf("Rollback %q failed: %s", targetRelease.Name, err)
r.cfg.Log("warning: %s", msg)
currentRelease.Info.Status = release.StatusSuperseded
targetRelease.Info.Status = release.StatusFailed
targetRelease.Info.Description = msg
r.cfg.recordRelease(currentRelease)
r.cfg.recordRelease(targetRelease)
if r.CleanupOnFail {
r.cfg.Log("Cleanup on fail set, cleaning up %d resources", len(results.Created))
_, errs := r.cfg.KubeClient.Delete(results.Created)
if errs != nil {
var errorList []string
for _, e := range errs {
errorList = append(errorList, e.Error())
}
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)
}
r.cfg.Log("Resource cleanup complete")
}
return targetRelease, err
}
if r.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(r.cfg, results.Updated); err != nil {
r.cfg.Log(err.Error())
}
}
if r.Wait {
if err := r.cfg.KubeClient.Wait(target, r.Timeout); err != nil {
targetRelease.SetStatus(release.StatusFailed, fmt.Sprintf("Release %q failed: %s", targetRelease.Name, err.Error()))
r.cfg.recordRelease(currentRelease)
r.cfg.recordRelease(targetRelease)
return targetRelease, errors.Wrapf(err, "release %s failed", targetRelease.Name)
}
}
// post-rollback hooks
if !r.DisableHooks {
if err := r.cfg.execHook(targetRelease, release.HookPostRollback, r.Timeout); err != nil {
return targetRelease, err
}
}
deployed, err := r.cfg.Releases.DeployedAll(currentRelease.Name)
if err != nil {
return nil, err
}
// Supersede all previous deployments, see issue #2941.
for _, rel := range deployed {
r.cfg.Log("superseding previous deployment %d", rel.Version)
rel.Info.Status = release.StatusSuperseded
r.cfg.recordRelease(rel)
}
targetRelease.Info.Status = release.StatusDeployed
return targetRelease, nil
}