mirror of https://github.com/helm/helm
*ReleaseServer.RollbackRelease -> tiller/release_rollback.gopull/2473/head
fibonacci1729
8 years ago
parent
a3d44f4f02
commit
b5c213d5dd
@ -0,0 +1,146 @@
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/*
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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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ctx "golang.org/x/net/context"
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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(c ctx.Context, req *services.RollbackReleaseRequest) (*services.RollbackReleaseResponse, error) {
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err := s.env.Releases.LockRelease(req.Name)
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if err != nil {
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return nil, err
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}
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defer s.env.Releases.UnlockRelease(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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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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if err := s.env.Releases.Create(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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switch {
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case !ValidName.MatchString(req.Name):
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return nil, nil, errMissingRelease
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case req.Version < 0:
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return nil, nil, errInvalidRevision
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}
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crls, 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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rbv := req.Version
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if req.Version == 0 {
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rbv = crls.Version - 1
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}
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s.Log("rolling back %s (current: v%d, target: v%d)", req.Name, crls.Version, rbv)
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prls, err := s.env.Releases.Get(req.Name, rbv)
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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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target := &release.Release{
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Name: req.Name,
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Namespace: crls.Namespace,
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Chart: prls.Chart,
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Config: prls.Config,
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Info: &release.Info{
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FirstDeployed: crls.Info.FirstDeployed,
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LastDeployed: timeconv.Now(),
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Status: &release.Status{
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Code: release.Status_UNKNOWN,
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Notes: prls.Info.Status.Notes,
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},
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// Because we lose the reference to rbv 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", rbv),
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},
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Version: crls.Version + 1,
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Manifest: prls.Manifest,
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Hooks: prls.Hooks,
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}
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return crls, target, nil
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}
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func (s *ReleaseServer) performRollback(currentRelease, targetRelease *release.Release, req *services.RollbackReleaseRequest) (*services.RollbackReleaseResponse, error) {
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res := &services.RollbackReleaseResponse{Release: targetRelease}
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if req.DryRun {
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s.Log("Dry run for %s", targetRelease.Name)
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return res, 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 res, err
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}
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}
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if err := s.ReleaseModule.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, false)
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return res, 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 res, err
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}
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}
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currentRelease.Info.Status.Code = release.Status_SUPERSEDED
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s.recordRelease(currentRelease, true)
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targetRelease.Info.Status.Code = release.Status_DEPLOYED
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return res, nil
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}
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