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290 lines
8.9 KiB
290 lines
8.9 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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"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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"k8s.io/helm/pkg/chartutil"
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"k8s.io/helm/pkg/hapi"
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"k8s.io/helm/pkg/hapi/release"
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"k8s.io/helm/pkg/hooks"
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)
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// UpdateRelease takes an existing release and new information, and upgrades the release.
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func (s *ReleaseServer) UpdateRelease(req *hapi.UpdateReleaseRequest) (*release.Release, error) {
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if err := validateReleaseName(req.Name); err != nil {
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return nil, errors.Errorf("updateRelease: Release name is invalid: %s", req.Name)
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}
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s.Log("preparing update for %s", req.Name)
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currentRelease, updatedRelease, err := s.prepareUpdate(req)
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if err != nil {
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if req.Force {
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// Use the --force, Luke.
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return s.performUpdateForce(req)
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}
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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 updated release for %s", req.Name)
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if err := s.Releases.Create(updatedRelease); err != nil {
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return nil, err
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}
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}
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s.Log("performing update for %s", req.Name)
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res, err := s.performUpdate(currentRelease, updatedRelease, 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 updated release for %s", req.Name)
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if err := s.Releases.Update(updatedRelease); 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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// prepareUpdate builds an updated release for an update operation.
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func (s *ReleaseServer) prepareUpdate(req *hapi.UpdateReleaseRequest) (*release.Release, *release.Release, error) {
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if req.Chart == nil {
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return nil, nil, errMissingChart
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}
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// finds the deployed release with the given name
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currentRelease, err := s.Releases.Deployed(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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// determine if values will be reused
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if err := s.reuseValues(req, currentRelease); err != nil {
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return nil, nil, err
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}
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// finds the non-deleted release with the given name
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lastRelease, err := s.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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// Increment revision count. This is passed to templates, and also stored on
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// the release object.
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revision := lastRelease.Version + 1
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ts := time.Now()
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options := chartutil.ReleaseOptions{
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Name: req.Name,
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IsUpgrade: true,
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}
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caps, err := capabilities(s.discovery)
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if err != nil {
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return nil, nil, err
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}
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valuesToRender, err := chartutil.ToRenderValues(req.Chart, req.Values, options, caps)
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if err != nil {
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return nil, nil, err
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}
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hooks, manifestDoc, notesTxt, err := s.renderResources(req.Chart, valuesToRender, caps.APIVersions)
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if err != nil {
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return nil, nil, err
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}
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// Store an updated release.
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updatedRelease := &release.Release{
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Name: req.Name,
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Namespace: currentRelease.Namespace,
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Chart: req.Chart,
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Config: req.Values,
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Info: &release.Info{
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FirstDeployed: currentRelease.Info.FirstDeployed,
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LastDeployed: ts,
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Status: release.StatusPendingUpgrade,
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Description: "Preparing upgrade", // This should be overwritten later.
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},
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Version: revision,
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Manifest: manifestDoc.String(),
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Hooks: hooks,
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}
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if len(notesTxt) > 0 {
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updatedRelease.Info.Notes = notesTxt
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}
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err = validateManifest(s.KubeClient, currentRelease.Namespace, manifestDoc.Bytes())
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return currentRelease, updatedRelease, err
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}
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// performUpdateForce performs the same action as a `helm uninstall && helm install --replace`.
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func (s *ReleaseServer) performUpdateForce(req *hapi.UpdateReleaseRequest) (*release.Release, error) {
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// find the last release with the given name
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oldRelease, err := s.Releases.Last(req.Name)
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if err != nil {
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return nil, err
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}
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newRelease, err := s.prepareRelease(&hapi.InstallReleaseRequest{
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Chart: req.Chart,
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Values: req.Values,
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DryRun: req.DryRun,
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Name: req.Name,
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DisableHooks: req.DisableHooks,
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Namespace: oldRelease.Namespace,
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ReuseName: true,
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Timeout: req.Timeout,
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Wait: req.Wait,
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})
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if err != nil {
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// On dry run, append the manifest contents to a failed release. This is
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// a stop-gap until we can revisit an error backchannel post-2.0.
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if req.DryRun && strings.HasPrefix(err.Error(), "YAML parse error") {
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err = errors.Wrap(err, newRelease.Manifest)
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}
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return newRelease, errors.Wrap(err, "failed update prepare step")
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}
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// From here on out, the release is considered to be in StatusUninstalling or StatusUninstalled
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// state. There is no turning back.
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oldRelease.Info.Status = release.StatusUninstalling
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oldRelease.Info.Deleted = time.Now()
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oldRelease.Info.Description = "Deletion in progress (or silently failed)"
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s.recordRelease(oldRelease, true)
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// pre-delete hooks
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if !req.DisableHooks {
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if err := s.execHook(oldRelease.Hooks, oldRelease.Name, oldRelease.Namespace, hooks.PreDelete, req.Timeout); err != nil {
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return newRelease, err
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}
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} else {
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s.Log("hooks disabled for %s", req.Name)
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}
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// delete manifests from the old release
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_, errs := s.deleteRelease(oldRelease)
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oldRelease.Info.Status = release.StatusUninstalled
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oldRelease.Info.Description = "Uninstallation complete"
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s.recordRelease(oldRelease, true)
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if len(errs) > 0 {
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return newRelease, errors.Errorf("upgrade --force successfully uninstalled the previous release, but encountered %d error(s) and cannot continue: %s", len(errs), joinErrors(errs))
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}
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// post-delete hooks
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if !req.DisableHooks {
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if err := s.execHook(oldRelease.Hooks, oldRelease.Name, oldRelease.Namespace, hooks.PostDelete, req.Timeout); err != nil {
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return newRelease, err
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}
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}
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// pre-install hooks
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if !req.DisableHooks {
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if err := s.execHook(newRelease.Hooks, newRelease.Name, newRelease.Namespace, hooks.PreInstall, req.Timeout); err != nil {
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return newRelease, err
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}
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}
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// update new release with next revision number so as to append to the old release's history
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newRelease.Version = oldRelease.Version + 1
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s.recordRelease(newRelease, false)
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if err := s.updateRelease(oldRelease, newRelease, req); err != nil {
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msg := fmt.Sprintf("Upgrade %q failed: %s", newRelease.Name, err)
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s.Log("warning: %s", msg)
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newRelease.Info.Status = release.StatusFailed
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newRelease.Info.Description = msg
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s.recordRelease(newRelease, true)
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return newRelease, err
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}
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// post-install hooks
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if !req.DisableHooks {
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if err := s.execHook(newRelease.Hooks, newRelease.Name, newRelease.Namespace, hooks.PostInstall, req.Timeout); err != nil {
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msg := fmt.Sprintf("Release %q failed post-install: %s", newRelease.Name, err)
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s.Log("warning: %s", msg)
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newRelease.Info.Status = release.StatusFailed
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newRelease.Info.Description = msg
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s.recordRelease(newRelease, true)
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return newRelease, err
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}
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}
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newRelease.Info.Status = release.StatusDeployed
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newRelease.Info.Description = "Upgrade complete"
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s.recordRelease(newRelease, true)
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return newRelease, nil
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}
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func (s *ReleaseServer) performUpdate(originalRelease, updatedRelease *release.Release, req *hapi.UpdateReleaseRequest) (*release.Release, error) {
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if req.DryRun {
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s.Log("dry run for %s", updatedRelease.Name)
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updatedRelease.Info.Description = "Dry run complete"
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return updatedRelease, nil
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}
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// pre-upgrade hooks
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if !req.DisableHooks {
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if err := s.execHook(updatedRelease.Hooks, updatedRelease.Name, updatedRelease.Namespace, hooks.PreUpgrade, req.Timeout); err != nil {
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return updatedRelease, err
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}
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} else {
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s.Log("update hooks disabled for %s", req.Name)
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}
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if err := s.updateRelease(originalRelease, updatedRelease, req); err != nil {
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msg := fmt.Sprintf("Upgrade %q failed: %s", updatedRelease.Name, err)
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s.Log("warning: %s", msg)
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updatedRelease.Info.Status = release.StatusFailed
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updatedRelease.Info.Description = msg
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s.recordRelease(originalRelease, true)
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s.recordRelease(updatedRelease, true)
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return updatedRelease, err
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}
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// post-upgrade hooks
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if !req.DisableHooks {
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if err := s.execHook(updatedRelease.Hooks, updatedRelease.Name, updatedRelease.Namespace, hooks.PostUpgrade, req.Timeout); err != nil {
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return updatedRelease, err
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}
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}
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originalRelease.Info.Status = release.StatusSuperseded
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s.recordRelease(originalRelease, true)
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updatedRelease.Info.Status = release.StatusDeployed
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updatedRelease.Info.Description = "Upgrade complete"
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return updatedRelease, nil
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}
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// updateRelease performs an update from current to target release
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func (s *ReleaseServer) updateRelease(current, target *release.Release, req *hapi.UpdateReleaseRequest) error {
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c := bytes.NewBufferString(current.Manifest)
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t := bytes.NewBufferString(target.Manifest)
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return s.KubeClient.Update(target.Namespace, c, t, req.Force, req.Recreate, req.Timeout, req.Wait)
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}
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