/
util.go
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/
util.go
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/*
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 storagedriver
import (
"bytes"
"compress/gzip"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"github.com/alauda/helm-crds/pkg/apis/app/v1alpha1"
"helm.sh/helm/v3/pkg/chart"
rspb "helm.sh/helm/v3/pkg/release"
"k8s.io/klog"
)
var b64 = base64.StdEncoding
var magicGzip = []byte{0x1f, 0x8b, 0x08}
// encodeRelease encodes a release returning a base64 encoded
// gzipped binary protobuf encoding representation, or error.
func encodeRelease(rls *rspb.Release) (*v1alpha1.Release, error) {
var rel v1alpha1.Release
data, err := encodeData(rls.Chart)
if err != nil {
return nil, err
}
rel.Spec.ChartData = data
data, err = encodeData(rls.Config)
if err != nil {
return nil, err
}
rel.Spec.ConfigData = data
data, err = encodeData(rls.Hooks)
if err != nil {
return nil, err
}
rel.Spec.HooksData = data
data, err = encodeData(rls.Manifest)
if err != nil {
return nil, err
}
rel.Spec.ManifestData = data
rel.Spec.Name = rls.Name
rel.Spec.Version = rls.Version
rel.Name = makeKey(rls.Name, rls.Version)
rel.Namespace = rls.Namespace
rel.Status.CopyFromReleaseInfo(rls.Info)
return &rel, nil
}
func encodeData(data interface{}) (string, error) {
b, err := json.Marshal(data)
if err != nil {
return "", err
}
var buf bytes.Buffer
w, err := gzip.NewWriterLevel(&buf, gzip.BestCompression)
if err != nil {
return "", err
}
if _, err = w.Write(b); err != nil {
return "", err
}
if err := w.Close(); err != nil {
return "", err
}
return b64.EncodeToString(buf.Bytes()), nil
}
// TODO: remote this
func decodeRawRelease(rel *v1alpha1.Release) (*rspb.Release, error) {
var rls rspb.Release
rls.Info = rel.Status.ToReleaseInfo()
rls.Version = rel.Spec.Version
rls.Name = rel.Spec.Name
rls.Namespace = rel.GetNamespace()
return &rls, nil
}
// decodeRelease decodes the bytes in data into a release
// type. Data must contain a base64 encoded string of a
// valid protobuf encoding of a release, otherwise
// an error is returned.
func decodeRelease(rel *v1alpha1.Release) (*rspb.Release, error) {
var rls rspb.Release
rls.Info = rel.Status.ToReleaseInfo()
rls.Version = rel.Spec.Version
rls.Name = rel.Spec.Name
rls.Namespace = rel.GetNamespace()
var chart chart.Chart
b, err := getEncodedBytes(rel.Spec.ChartData)
if err != nil {
return nil, err
}
if err := json.Unmarshal(b, &chart); err != nil {
return nil, err
}
rls.Chart = &chart
var config map[string]interface{}
b, err = getEncodedBytes(rel.Spec.ConfigData)
if err != nil {
return nil, err
}
if err := json.Unmarshal(b, &config); err != nil {
return nil, err
}
rls.Config = config
var hooks []*rspb.Hook
b, err = getEncodedBytes(rel.Spec.HooksData)
if err != nil {
return nil, err
}
if err := json.Unmarshal(b, &hooks); err != nil {
klog.Errorf("decode hooks data error: %s", string(b))
return nil, err
}
rls.Hooks = hooks
var manifest string
b, err = getEncodedBytes(rel.Spec.ManifestData)
if err != nil {
return nil, err
}
if err := json.Unmarshal(b, &manifest); err != nil {
return nil, err
}
rls.Manifest = manifest
return &rls, nil
}
func getEncodedBytes(data string) ([]byte, error) {
// base64 decode string
b, err := b64.DecodeString(data)
if err != nil {
return nil, err
}
// For backwards compatibility with releases that were stored before
// compression was introduced we skip decompression if the
// gzip magic header is not found
if bytes.Equal(b[0:3], magicGzip) {
r, err := gzip.NewReader(bytes.NewReader(b))
if err != nil {
return nil, err
}
b2, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
b = b2
}
return b, 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 int) string {
return fmt.Sprintf("%s.v%d", rlsname, version)
}