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161 lines
4.8 KiB
161 lines
4.8 KiB
/*
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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 tiller
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import (
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"fmt"
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"k8s.io/helm/pkg/hooks"
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"k8s.io/helm/pkg/proto/hapi/release"
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"k8s.io/helm/pkg/proto/hapi/services"
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"k8s.io/helm/pkg/timeconv"
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)
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// RollbackRelease rolls back to a previous version of the given release.
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func (s *ReleaseServer) RollbackRelease(req *services.RollbackReleaseRequest) (*release.Release, error) {
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s.Log("preparing rollback of %s", req.Name)
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currentRelease, targetRelease, err := s.prepareRollback(req)
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if err != nil {
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return nil, err
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}
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if !req.DryRun {
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s.Log("creating rolled back release for %s", req.Name)
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if err := s.env.Releases.Create(targetRelease); err != nil {
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return nil, err
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}
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}
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s.Log("performing rollback of %s", req.Name)
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res, err := s.performRollback(currentRelease, targetRelease, req)
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if err != nil {
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return res, err
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}
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if !req.DryRun {
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s.Log("updating status for rolled back release for %s", req.Name)
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if err := s.env.Releases.Update(targetRelease); err != nil {
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return res, err
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}
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}
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return res, 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 (s *ReleaseServer) prepareRollback(req *services.RollbackReleaseRequest) (*release.Release, *release.Release, error) {
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if err := validateReleaseName(req.Name); err != nil {
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s.Log("prepareRollback: Release name is invalid: %s", req.Name)
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return nil, nil, err
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}
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if req.Version < 0 {
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return nil, nil, errInvalidRevision
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}
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currentRelease, err := s.env.Releases.Last(req.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 := req.Version
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if req.Version == 0 {
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previousVersion = currentRelease.Version - 1
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}
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s.Log("rolling back %s (current: v%d, target: v%d)", req.Name, currentRelease.Version, previousVersion)
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previousRelease, err := s.env.Releases.Get(req.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: req.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: timeconv.Now(),
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Status: &release.Status{
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Code: release.Status_PENDING_ROLLBACK,
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Notes: previousRelease.Info.Status.Notes,
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},
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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 (s *ReleaseServer) performRollback(currentRelease, targetRelease *release.Release, req *services.RollbackReleaseRequest) (*release.Release, error) {
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if req.DryRun {
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s.Log("dry run for %s", targetRelease.Name)
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return targetRelease, nil
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}
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// pre-rollback hooks
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if !req.DisableHooks {
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if err := s.execHook(targetRelease.Hooks, targetRelease.Name, targetRelease.Namespace, hooks.PreRollback, req.Timeout); err != nil {
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return targetRelease, err
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}
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} else {
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s.Log("rollback hooks disabled for %s", req.Name)
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}
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if err := s.Rollback(currentRelease, targetRelease, req, s.env); err != nil {
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msg := fmt.Sprintf("Rollback %q failed: %s", targetRelease.Name, err)
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s.Log("warning: %s", msg)
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currentRelease.Info.Status.Code = release.Status_SUPERSEDED
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targetRelease.Info.Status.Code = release.Status_FAILED
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targetRelease.Info.Description = msg
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s.recordRelease(currentRelease, true)
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s.recordRelease(targetRelease, true)
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return targetRelease, err
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}
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// post-rollback hooks
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if !req.DisableHooks {
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if err := s.execHook(targetRelease.Hooks, targetRelease.Name, targetRelease.Namespace, hooks.PostRollback, req.Timeout); err != nil {
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return targetRelease, err
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}
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}
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deployed, err := s.env.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 _, r := range deployed {
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s.Log("superseding previous deployment %d", r.Version)
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r.Info.Status.Code = release.Status_SUPERSEDED
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s.recordRelease(r, true)
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}
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targetRelease.Info.Status.Code = release.Status_DEPLOYED
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return targetRelease, nil
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}
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