mirror of https://github.com/helm/helm
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
273 lines
8.4 KiB
273 lines
8.4 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 storage // import "k8s.io/helm/pkg/storage"
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
rspb "k8s.io/helm/pkg/proto/hapi/release"
|
|
relutil "k8s.io/helm/pkg/releaseutil"
|
|
"k8s.io/helm/pkg/storage/driver"
|
|
)
|
|
|
|
const NoReleasesErr = "has no deployed releases"
|
|
|
|
// Storage represents a storage engine for a Release.
|
|
type Storage struct {
|
|
driver.Driver
|
|
|
|
// MaxHistory specifies the maximum number of historical releases that will
|
|
// be retained, including the most recent release. Values of 0 or less are
|
|
// ignored (meaning no limits are imposed).
|
|
MaxHistory int
|
|
|
|
Log func(string, ...interface{})
|
|
}
|
|
|
|
// Get retrieves the release from storage. An error is returned
|
|
// if the storage driver failed to fetch the release, or the
|
|
// release identified by the key, version pair does not exist.
|
|
func (s *Storage) Get(name string, version int32) (*rspb.Release, error) {
|
|
s.Log("getting release %q", makeKey(name, version))
|
|
return s.Driver.Get(makeKey(name, version))
|
|
}
|
|
|
|
// Create creates a new storage entry holding the release. An
|
|
// error is returned if the storage driver failed to store the
|
|
// release, or a release with identical an key already exists.
|
|
func (s *Storage) Create(rls *rspb.Release) error {
|
|
s.Log("creating release %q", makeKey(rls.Name, rls.Version))
|
|
if s.MaxHistory > 0 {
|
|
// Want to make space for one more release.
|
|
s.removeLeastRecent(rls.Name, s.MaxHistory-1)
|
|
}
|
|
return s.Driver.Create(makeKey(rls.Name, rls.Version), rls)
|
|
}
|
|
|
|
// Update update the release in storage. An error is returned if the
|
|
// storage backend fails to update the release or if the release
|
|
// does not exist.
|
|
func (s *Storage) Update(rls *rspb.Release) error {
|
|
s.Log("updating release %q", makeKey(rls.Name, rls.Version))
|
|
return s.Driver.Update(makeKey(rls.Name, rls.Version), rls)
|
|
}
|
|
|
|
// Delete deletes the release from storage. An error is returned if
|
|
// the storage backend fails to delete the release or if the release
|
|
// does not exist.
|
|
func (s *Storage) Delete(name string, version int32) (*rspb.Release, error) {
|
|
s.Log("deleting release %q", makeKey(name, version))
|
|
return s.Driver.Delete(makeKey(name, version))
|
|
}
|
|
|
|
// ListReleases returns all releases from storage. An error is returned if the
|
|
// storage backend fails to retrieve the releases.
|
|
func (s *Storage) ListReleases() ([]*rspb.Release, error) {
|
|
s.Log("listing all releases in storage")
|
|
return s.Driver.List(func(_ *rspb.Release) bool { return true })
|
|
}
|
|
|
|
// ListDeleted returns all releases with Status == DELETED. An error is returned
|
|
// if the storage backend fails to retrieve the releases.
|
|
func (s *Storage) ListDeleted() ([]*rspb.Release, error) {
|
|
s.Log("listing deleted releases in storage")
|
|
return s.Driver.List(func(rls *rspb.Release) bool {
|
|
return relutil.StatusFilter(rspb.Status_DELETED).Check(rls)
|
|
})
|
|
}
|
|
|
|
// ListDeployed returns all releases with Status == DEPLOYED. An error is returned
|
|
// if the storage backend fails to retrieve the releases.
|
|
func (s *Storage) ListDeployed() ([]*rspb.Release, error) {
|
|
s.Log("listing all deployed releases in storage")
|
|
return s.Driver.List(func(rls *rspb.Release) bool {
|
|
return relutil.StatusFilter(rspb.Status_DEPLOYED).Check(rls)
|
|
})
|
|
}
|
|
|
|
// ListFilterAll returns the set of releases satisfying the predicate
|
|
// (filter0 && filter1 && ... && filterN), i.e. a Release is included in the results
|
|
// if and only if all filters return true.
|
|
func (s *Storage) ListFilterAll(fns ...relutil.FilterFunc) ([]*rspb.Release, error) {
|
|
s.Log("listing all releases with filter")
|
|
return s.Driver.List(func(rls *rspb.Release) bool {
|
|
return relutil.All(fns...).Check(rls)
|
|
})
|
|
}
|
|
|
|
// ListFilterAny returns the set of releases satisfying the predicate
|
|
// (filter0 || filter1 || ... || filterN), i.e. a Release is included in the results
|
|
// if at least one of the filters returns true.
|
|
func (s *Storage) ListFilterAny(fns ...relutil.FilterFunc) ([]*rspb.Release, error) {
|
|
s.Log("listing any releases with filter")
|
|
return s.Driver.List(func(rls *rspb.Release) bool {
|
|
return relutil.Any(fns...).Check(rls)
|
|
})
|
|
}
|
|
|
|
// Deployed returns the last deployed release with the provided release name, or
|
|
// returns ErrReleaseNotFound if not found.
|
|
func (s *Storage) Deployed(name string) (*rspb.Release, error) {
|
|
ls, err := s.DeployedAll(name)
|
|
if err != nil {
|
|
if strings.Contains(err.Error(), "not found") {
|
|
return nil, fmt.Errorf("%q %s", name, NoReleasesErr)
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
if len(ls) == 0 {
|
|
return nil, fmt.Errorf("%q %s", name, NoReleasesErr)
|
|
}
|
|
|
|
return ls[0], err
|
|
}
|
|
|
|
// DeployedAll returns all deployed releases with the provided name, or
|
|
// returns ErrReleaseNotFound if not found.
|
|
func (s *Storage) DeployedAll(name string) ([]*rspb.Release, error) {
|
|
s.Log("getting deployed releases from %q history", name)
|
|
|
|
ls, err := s.Driver.Query(map[string]string{
|
|
"NAME": name,
|
|
"OWNER": "TILLER",
|
|
"STATUS": "DEPLOYED",
|
|
})
|
|
if err == nil {
|
|
return ls, nil
|
|
}
|
|
if strings.Contains(err.Error(), "not found") {
|
|
return nil, fmt.Errorf("%q %s", name, NoReleasesErr)
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
// History returns the revision history for the release with the provided name, or
|
|
// returns ErrReleaseNotFound if no such release name exists.
|
|
func (s *Storage) History(name string) ([]*rspb.Release, error) {
|
|
s.Log("getting release history for %q", name)
|
|
|
|
return s.Driver.Query(map[string]string{"NAME": name, "OWNER": "TILLER"})
|
|
}
|
|
|
|
// removeLeastRecent removes items from history until the length number of releases
|
|
// does not exceed max.
|
|
//
|
|
// We allow max to be set explicitly so that calling functions can "make space"
|
|
// for the new records they are going to write.
|
|
func (s *Storage) removeLeastRecent(name string, max int) error {
|
|
if max < 0 {
|
|
return nil
|
|
}
|
|
h, err := s.History(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(h) <= max {
|
|
return nil
|
|
}
|
|
|
|
// We want oldest to newest
|
|
relutil.SortByRevision(h)
|
|
|
|
lastDeployed, err := s.Deployed(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var toDelete []*rspb.Release
|
|
for _, rel := range h {
|
|
// once we have enough releases to delete to reach the max, stop
|
|
if len(h)-len(toDelete) == max {
|
|
break
|
|
}
|
|
if lastDeployed != nil {
|
|
if rel.GetVersion() != lastDeployed.GetVersion() {
|
|
toDelete = append(toDelete, rel)
|
|
}
|
|
} else {
|
|
toDelete = append(toDelete, rel)
|
|
}
|
|
}
|
|
|
|
// Delete as many as possible. In the case of API throughput limitations,
|
|
// multiple invocations of this function will eventually delete them all.
|
|
errors := []error{}
|
|
for _, rel := range toDelete {
|
|
err = s.deleteReleaseVersion(name, rel.GetVersion())
|
|
if err != nil {
|
|
errors = append(errors, err)
|
|
}
|
|
}
|
|
|
|
s.Log("Pruned %d record(s) from %s with %d error(s)", len(toDelete), name, len(errors))
|
|
switch c := len(errors); c {
|
|
case 0:
|
|
return nil
|
|
case 1:
|
|
return errors[0]
|
|
default:
|
|
return fmt.Errorf("encountered %d deletion errors. First is: %s", c, errors[0])
|
|
}
|
|
}
|
|
|
|
func (s *Storage) deleteReleaseVersion(name string, version int32) error {
|
|
key := makeKey(name, version)
|
|
_, err := s.Delete(name, version)
|
|
if err != nil {
|
|
s.Log("error pruning %s from release history: %s", key, err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Last fetches the last revision of the named release.
|
|
func (s *Storage) Last(name string) (*rspb.Release, error) {
|
|
s.Log("getting last revision of %q", name)
|
|
h, err := s.History(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(h) == 0 {
|
|
return nil, fmt.Errorf("no revision for release %q", name)
|
|
}
|
|
|
|
relutil.Reverse(h, relutil.SortByRevision)
|
|
return h[0], nil
|
|
}
|
|
|
|
// makeKey concatenates a release name and version into
|
|
// a string with format ```<release_name>#v<version>```.
|
|
// This key is used to uniquely identify storage objects.
|
|
func makeKey(rlsname string, version int32) string {
|
|
return fmt.Sprintf("%s.v%d", rlsname, version)
|
|
}
|
|
|
|
// Init initializes a new storage backend with the driver d.
|
|
// If d is nil, the default in-memory driver is used.
|
|
func Init(d driver.Driver) *Storage {
|
|
// default driver is in memory
|
|
if d == nil {
|
|
d = driver.NewMemory()
|
|
}
|
|
return &Storage{
|
|
Driver: d,
|
|
Log: func(_ string, _ ...interface{}) {},
|
|
}
|
|
}
|