/
storage.go
192 lines (159 loc) · 4.29 KB
/
storage.go
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package storage
import (
"archive/tar"
"context"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"time"
"github.com/mholt/archiver/v4"
)
var ObjectNotFoundError = errors.New("Object not found")
type Version struct {
Name string `json:"name"`
Ref string `json:"ref"`
Updated time.Time `json:"updated"`
}
// public only because []Object != []ObjectImpl :(
type Object interface {
NewReader() (io.ReadCloser, error)
NewWriter() io.WriteCloser
Version() (Version, error)
}
type Bucket interface {
GetAllObjects() ([]Object, error)
Delete() error // test only
}
type tarrer interface {
Archive(ctx context.Context, output io.Writer, files []archiver.File) error
Extract(ctx context.Context, sourceArchive io.Reader, pathsInArchive []string, handleFile archiver.FileHandler) error
}
type Storage struct {
Name string
Bucket Bucket
Object Object
Archiver tarrer
}
func (s Storage) GetAllNewerVersions(watermark Version) ([]Version, error) {
objects, err := s.Bucket.GetAllObjects()
if err != nil {
return nil, err
}
versions := []Version{}
for _, object := range objects {
version, err := object.Version()
if err != nil {
return nil, err
}
if version.Updated.Before(watermark.Updated) {
continue
}
versions = append(versions, version)
}
return versions, nil
}
func (s Storage) Version() (Version, error) {
return s.Object.Version()
}
func (s Storage) Download(targetDir string) (Version, error) {
reader, err := s.Object.NewReader()
if err != nil {
if err == ObjectNotFoundError {
return s.Upload(targetDir)
}
return Version{}, err
}
defer reader.Close() // what happens if this errors?
err = os.MkdirAll(targetDir, os.ModePerm)
if err != nil {
return Version{}, err
}
handler := func(ctx context.Context, f archiver.File) error {
hdr, ok := f.Header.(*tar.Header)
if !ok {
return nil
}
var fpath = filepath.Join(targetDir, f.NameInArchive)
switch hdr.Typeflag {
case tar.TypeDir:
if err := os.MkdirAll(fpath, 0755); err != nil {
return fmt.Errorf("failed to make directory %s: %w", fpath, err)
}
return nil
case tar.TypeReg, tar.TypeRegA, tar.TypeChar, tar.TypeBlock, tar.TypeFifo:
if err := os.MkdirAll(filepath.Dir(fpath), 0755); err != nil {
return fmt.Errorf("failed to make directory %s: %w", filepath.Dir(fpath), err)
}
out, err := os.Create(fpath)
if err != nil {
return fmt.Errorf("%s: creating new file: %v", fpath, err)
}
defer out.Close()
err = out.Chmod(f.Mode())
if err != nil && runtime.GOOS != "windows" {
return fmt.Errorf("%s: changing file mode: %v", fpath, err)
}
in, err := f.Open()
if err != nil {
return err
}
_, err = io.Copy(out, in)
if err != nil {
return fmt.Errorf("%s: writing file: %v", fpath, err)
}
return nil
case tar.TypeSymlink:
if err := os.MkdirAll(filepath.Dir(fpath), 0755); err != nil {
return fmt.Errorf("failed to make directory %s: %w", filepath.Dir(fpath), err)
}
err = os.Symlink(hdr.Linkname, fpath)
if err != nil {
return fmt.Errorf("%s: making symbolic link for: %v", fpath, err)
}
return nil
case tar.TypeLink:
if err := os.MkdirAll(filepath.Dir(fpath), 0755); err != nil {
return fmt.Errorf("failed to make directory %s: %w", filepath.Dir(fpath), err)
}
err = os.Link(filepath.Join(fpath, hdr.Linkname), fpath)
if err != nil {
return fmt.Errorf("%s: making symbolic link for: %v", fpath, err)
}
return nil
case tar.TypeXGlobalHeader:
return nil // ignore the pax global header from git-generated tarballs
default:
return fmt.Errorf("%s: unknown type flag: %c", hdr.Name, hdr.Typeflag)
}
}
err = s.Archiver.Extract(context.Background(), reader, nil, handler)
if err != nil {
return Version{}, err
}
return s.Version()
}
func (s Storage) Upload(filePath string) (Version, error) {
writer := s.Object.NewWriter()
path := make(map[string]string)
path[filePath+"/"] = ""
diskfiles, err := archiver.FilesFromDisk(nil, path)
if err != nil {
return Version{}, err
}
err = s.Archiver.Archive(context.Background(), writer, diskfiles)
if err != nil {
return Version{}, err
}
err = writer.Close()
if err != nil {
return Version{}, err
}
return s.Version()
}
// test cleanup only
func (s Storage) DeleteBucket() error {
return s.Bucket.Delete()
}