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filestore.go
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filestore.go
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/*
Copyright 2019 The Kubernetes 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 filepromoter
import (
"context"
"fmt"
"io"
"net/url"
"strings"
"cloud.google.com/go/storage"
"github.com/sirupsen/logrus"
"google.golang.org/api/option"
api "sigs.k8s.io/k8s-container-image-promoter/api/files"
"sigs.k8s.io/release-sdk/object"
)
// FilestorePromoter manages the promotion of files.
type FilestorePromoter struct {
Source *api.Filestore
Dest *api.Filestore
Files []api.File
DryRun bool
// UseServiceAccount must be true, for service accounts to be used
// This gives some protection against a hostile manifest.
UseServiceAccount bool
}
//counterfeiter:generate . syncFilestore
type syncFilestore interface {
// OpenReader opens an io.ReadCloser for the specified file
OpenReader(ctx context.Context, name string) (io.ReadCloser, error)
// UploadFile uploads a local file to the specified destination
UploadFile(ctx context.Context, dest string, localFile string) error
// ListFiles returns all the file artifacts in the filestore, recursively.
ListFiles(ctx context.Context) (map[string]*SyncFileInfo, error)
}
func openFilestore(
ctx context.Context,
filestore *api.Filestore,
useServiceAccount, dryRun bool,
) (syncFilestore, error) {
u, err := url.Parse(filestore.Base)
if err != nil {
return nil, fmt.Errorf(
"error parsing filestore base %q: %v",
filestore.Base,
err,
)
}
if u.Scheme != "gs" {
return nil, fmt.Errorf(
"unrecognized scheme %q (supported schemes: %s)",
filestore.Base,
object.GcsPrefix,
)
}
withAuth, err := useStorageClientAuth(filestore, useServiceAccount, dryRun)
if err != nil {
return nil, err
}
var opts []option.ClientOption
if withAuth {
logrus.Infof(
"requesting an authenticated storage client for %s",
filestore.Base,
)
ts := &gcloudTokenSource{ServiceAccount: filestore.ServiceAccount}
opts = append(opts, option.WithTokenSource(ts))
} else {
logrus.Warnf(
"requesting an UNAUTHENTICATED storage client for %s",
filestore.Base,
)
opts = append(opts, option.WithoutAuthentication())
}
client, err := storage.NewClient(ctx, opts...)
if err != nil {
return nil, fmt.Errorf("error building GCS client: %v", err)
}
prefix := strings.TrimPrefix(u.Path, "/")
if prefix != "" && !strings.HasSuffix(prefix, "/") {
prefix += "/"
}
bucket := u.Host
s := &gcsSyncFilestore{
filestore: filestore,
client: client,
bucket: bucket,
prefix: prefix,
}
return s, nil
}
func useStorageClientAuth(
filestore *api.Filestore,
useServiceAccount, dryRun bool,
) (bool, error) {
withAuth := false
// Source filestores should be world-readable, so authentication should
// not be required.
if filestore.Src {
return withAuth, nil
}
if !dryRun {
if filestore.ServiceAccount == "" {
return withAuth, fmt.Errorf("cannot execute a production file promotion without a service account")
}
withAuth = true
} else if useServiceAccount {
if filestore.ServiceAccount == "" {
return withAuth, fmt.Errorf("requested an authenticated file promotion, but a service account was not specified")
}
withAuth = true
}
return withAuth, nil
}
// computeNeededOperations determines the list of files that need to be copied
func (p *FilestorePromoter) computeNeededOperations(
source, dest map[string]*SyncFileInfo,
destFilestore syncFilestore) ([]SyncFileOp, error) {
ops := make([]SyncFileOp, 0)
for i := range p.Files {
f := &p.Files[i]
relativePath := f.Name
sourceFile := source[relativePath]
if sourceFile == nil {
absolutePath := joinFilepath(p.Source, relativePath)
logrus.Debugf(
"file %q not found in source (%q)",
relativePath,
absolutePath,
)
continue
}
destFile := dest[relativePath]
if destFile == nil {
destFile = &SyncFileInfo{}
destFile.RelativePath = sourceFile.RelativePath
destFile.AbsolutePath = joinFilepath(
p.Dest,
sourceFile.RelativePath)
destFile.filestore = destFilestore
ops = append(ops, ©FileOp{
Source: sourceFile,
Dest: destFile,
ManifestFile: f,
})
continue
}
changed := false
if destFile.MD5 != sourceFile.MD5 {
logrus.Warnf("MD5 mismatch on source %q vs dest %q: %q vs %q",
sourceFile.AbsolutePath,
destFile.AbsolutePath,
sourceFile.MD5,
destFile.MD5)
changed = true
}
if destFile.Size != sourceFile.Size {
logrus.Warnf("Size mismatch on source %q vs dest %q: %d vs %d",
sourceFile.AbsolutePath,
destFile.AbsolutePath,
sourceFile.Size,
destFile.Size)
changed = true
}
if !changed {
logrus.Infof("metadata match for %q", destFile.AbsolutePath)
continue
}
ops = append(ops, ©FileOp{
Source: sourceFile,
Dest: destFile,
ManifestFile: f,
})
}
return ops, nil
}
func joinFilepath(filestore *api.Filestore, relativePath string) string {
s := strings.TrimSuffix(filestore.Base, "/")
s += "/"
s += strings.TrimPrefix(relativePath, "/")
return s
}
// BuildOperations builds the required operations to sync from the
// Source Filestore to the Dest Filestore.
func (p *FilestorePromoter) BuildOperations(
ctx context.Context) ([]SyncFileOp, error) {
sourceFilestore, err := openFilestore(
ctx,
p.Source,
p.UseServiceAccount,
p.DryRun,
)
if err != nil {
return nil, err
}
if sourceFilestore == nil {
return nil, fmt.Errorf("source filestore cannot be nil")
}
destFilestore, err := openFilestore(
ctx,
p.Dest,
p.UseServiceAccount,
p.DryRun,
)
if err != nil {
return nil, err
}
if destFilestore == nil {
return nil, fmt.Errorf("destination filestore cannot be nil")
}
sourceFiles, err := sourceFilestore.ListFiles(ctx)
if err != nil {
return nil, err
}
destFiles, err := destFilestore.ListFiles(ctx)
if err != nil {
return nil, err
}
return p.computeNeededOperations(sourceFiles, destFiles, destFilestore)
}