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copier.go
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copier.go
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package appfs
import (
"context"
"errors"
"io"
"os"
"path"
"strconv"
"strings"
"time"
"github.com/andybalholm/brotli"
"github.com/cozy/cozy-stack/pkg/consts"
"github.com/cozy/cozy-stack/pkg/filetype"
"github.com/cozy/cozy-stack/pkg/logger"
"github.com/cozy/cozy-stack/pkg/utils"
"github.com/ncw/swift/v2"
"github.com/spf13/afero"
)
// Copier is an interface defining a common set of functions for the installer
// to copy the application into an unknown storage.
type Copier interface {
Exist(slug, version, shasum string) (exists bool, err error)
Start(slug, version, shasum string) (exists bool, err error)
Copy(stat os.FileInfo, src io.Reader) error
Abort() error
Commit() error
}
type swiftCopier struct {
c *swift.Connection
appObj string
tmpObj string
container string
started bool
objectNames []string
ctx context.Context
}
type aferoCopier struct {
fs afero.Fs
appDir string
tmpDir string
started bool
}
// NewSwiftCopier defines a Copier storing data into a swift container.
func NewSwiftCopier(conn *swift.Connection, appsType consts.AppType) Copier {
return &swiftCopier{
c: conn,
container: containerName(appsType),
ctx: context.Background(),
}
}
func (f *swiftCopier) Exist(slug, version, shasum string) (bool, error) {
f.appObj = path.Join(slug, version)
if shasum != "" {
f.appObj += "-" + shasum
}
_, _, err := f.c.Object(f.ctx, f.container, f.appObj)
if err == nil {
return true, nil
}
if !errors.Is(err, swift.ObjectNotFound) {
return false, err
}
return false, nil
}
func (f *swiftCopier) Start(slug, version, shasum string) (bool, error) {
exist, err := f.Exist(slug, version, shasum)
if err != nil || exist {
return exist, err
}
if _, _, err = f.c.Container(f.ctx, f.container); errors.Is(err, swift.ContainerNotFound) {
if err = f.c.ContainerCreate(f.ctx, f.container, nil); err != nil {
return false, err
}
}
f.tmpObj = "tmp-" + utils.RandomString(20) + "/"
f.objectNames = []string{}
f.started = true
return false, err
}
func (f *swiftCopier) Copy(stat os.FileInfo, src io.Reader) (err error) {
if !f.started {
panic("copier should call Start() before Copy()")
}
objName := path.Join(f.tmpObj, stat.Name())
objMeta := swift.Metadata{
"content-encoding": "br",
"original-content-length": strconv.FormatInt(stat.Size(), 10),
}
contentType := filetype.ByExtension(path.Ext(stat.Name()))
if contentType == "" {
contentType, src = filetype.FromReader(src)
}
f.objectNames = append(f.objectNames, objName)
file, err := f.c.ObjectCreate(f.ctx, f.container, objName, true, "",
contentType, objMeta.ObjectHeaders())
if err != nil {
return err
}
defer func() {
if errc := file.Close(); errc != nil {
err = errc
}
}()
bw := brotli.NewWriter(file)
_, err = io.Copy(bw, src)
if errc := bw.Close(); errc != nil && err == nil {
err = errc
}
return err
}
func (f *swiftCopier) Abort() error {
_, err := f.c.BulkDelete(f.ctx, f.container, f.objectNames)
return err
}
func (f *swiftCopier) Commit() (err error) {
defer func() {
_, errc := f.c.BulkDelete(f.ctx, f.container, f.objectNames)
if errc != nil {
logger.WithNamespace("appfs").Errorf("Cannot BulkDelete after commit: %s", errc)
}
}()
// We check if the appObj has not been created concurrently by another
// copier.
_, _, err = f.c.Object(f.ctx, f.container, f.appObj)
if err == nil {
return nil
}
for _, srcObjectName := range f.objectNames {
dstObjectName := path.Join(f.appObj, strings.TrimPrefix(srcObjectName, f.tmpObj))
_, err = f.c.ObjectCopy(f.ctx, f.container, srcObjectName, f.container, dstObjectName, nil)
if err != nil {
logger.WithNamespace("appfs").Errorf("Cannot copy file: %s", err)
return err
}
}
return f.c.ObjectPutString(f.ctx, f.container, f.appObj, "", "text/plain")
}
// NewAferoCopier defines a copier using an afero.Fs filesystem to store the
// application data.
func NewAferoCopier(fs afero.Fs) Copier {
return &aferoCopier{fs: fs}
}
func (f *aferoCopier) Exist(slug, version, shasum string) (bool, error) {
appDir := path.Join("/", slug, version)
if shasum != "" {
appDir += "-" + shasum
}
return afero.DirExists(f.fs, appDir)
}
func (f *aferoCopier) Start(slug, version, shasum string) (bool, error) {
f.appDir = path.Join("/", slug, version)
if shasum != "" {
f.appDir += "-" + shasum
}
exists, err := afero.DirExists(f.fs, f.appDir)
if err != nil || exists {
return exists, err
}
dir := path.Dir(f.appDir)
if err = f.fs.MkdirAll(dir, 0755); err != nil {
return false, err
}
f.tmpDir, err = afero.TempDir(f.fs, dir, "tmp")
if err != nil {
return false, err
}
f.started = true
return false, nil
}
func (f *aferoCopier) Copy(stat os.FileInfo, src io.Reader) (err error) {
if !f.started {
panic("copier should call Start() before Copy()")
}
fullpath := path.Join(f.tmpDir, stat.Name()) + ".br"
dir := path.Dir(fullpath)
if err = f.fs.MkdirAll(dir, 0755); err != nil {
return err
}
dst, err := f.fs.Create(fullpath)
if err != nil {
return err
}
defer func() {
if errc := dst.Close(); errc != nil {
err = errc
}
}()
bw := brotli.NewWriter(dst)
_, err = io.Copy(bw, src)
if errc := bw.Close(); errc != nil && err == nil {
err = errc
}
return err
}
func (f *aferoCopier) Commit() error {
return f.fs.Rename(f.tmpDir, f.appDir)
}
func (f *aferoCopier) Abort() error {
return f.fs.RemoveAll(f.tmpDir)
}
// NewFileInfo returns an os.FileInfo
func NewFileInfo(name string, size int64, mode os.FileMode) os.FileInfo {
return &fileInfo{
name: name,
size: size,
mode: mode,
}
}
type fileInfo struct {
name string
size int64
mode os.FileMode
}
func (f *fileInfo) Name() string { return f.name }
func (f *fileInfo) Size() int64 { return f.size }
func (f *fileInfo) Mode() os.FileMode { return f.mode }
func (f *fileInfo) ModTime() time.Time { return time.Now() }
func (f *fileInfo) IsDir() bool { return false }
func (f *fileInfo) Sys() interface{} { return nil }