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Optimize repository layout
Use subdirectoriers for Data and Tree objects, e.g. store blob `aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f` at ``` ac/c0/aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f ``` Issue #58
This commit is contained in:
Alexander Neumann
parent
bbaba349b2
commit
6d56d7d4c6
@ -149,20 +149,33 @@ func (b *Local) tempFile() (*os.File, error) {
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// Rename temp file to final name according to type and ID.
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func (b *Local) renameFile(file *os.File, t Type, id ID) error {
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filename := filepath.Join(b.dir(t), id.String())
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return os.Rename(file.Name(), filename)
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newname := b.filename(t, id)
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oldname := file.Name()
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if t == Data || t == Tree {
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// create directories if necessary, ignore errors
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os.MkdirAll(filepath.Dir(newname), dirMode)
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}
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return os.Rename(oldname, newname)
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}
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// Construct directory for given Type.
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func (b *Local) dir(t Type) string {
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func (b *Local) dirname(t Type, id ID) string {
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var n string
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switch t {
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case Data:
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n = dataPath
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if id != nil {
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n = filepath.Join(dataPath, fmt.Sprintf("%02x", id[0]), fmt.Sprintf("%02x", id[1]))
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}
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case Snapshot:
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n = snapshotPath
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case Tree:
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n = treePath
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if id != nil {
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n = filepath.Join(treePath, fmt.Sprintf("%02x", id[0]), fmt.Sprintf("%02x", id[1]))
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}
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case Map:
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n = mapPath
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case Lock:
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@ -217,7 +230,7 @@ func (b *Local) Create(t Type, data []byte) (ID, error) {
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// Construct path for given Type and ID.
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func (b *Local) filename(t Type, id ID) string {
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return filepath.Join(b.dir(t), id.String())
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return filepath.Join(b.dirname(t, id), id.String())
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}
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// Get returns the content stored under the given ID. If the data doesn't match
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@ -270,7 +283,12 @@ func (b *Local) Remove(t Type, id ID) error {
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// List lists all objects of a given type.
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func (b *Local) List(t Type) (IDs, error) {
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// TODO: use os.Open() and d.Readdirnames() instead of Glob()
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pattern := filepath.Join(b.dir(t), "*")
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var pattern string
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if t == Data || t == Tree {
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pattern = filepath.Join(b.dirname(t, nil), "*", "*", "*")
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} else {
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pattern = filepath.Join(b.dirname(t, nil), "*")
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}
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matches, err := filepath.Glob(pattern)
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if err != nil {
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121
backend/sftp.go
121
backend/sftp.go
@ -155,13 +155,9 @@ func CreateSFTP(dir string, program string, args ...string) (*SFTP, error) {
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// create paths for data, refs and temp blobs
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for _, d := range dirs {
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// TODO: implement client.MkdirAll() and set mode to dirMode
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_, err = sftp.c.Lstat(d)
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err = sftp.mkdirAll(d, dirMode)
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if err != nil {
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err = sftp.c.Mkdir(d)
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if err != nil {
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return nil, err
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}
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return nil, err
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}
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}
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@ -225,21 +221,69 @@ func (r *SFTP) tempFile() (string, *sftp.File, error) {
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return name, f, nil
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}
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func (r *SFTP) mkdirAll(dir string, mode os.FileMode) error {
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// check if directory already exists
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fi, err := r.c.Lstat(dir)
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if err == nil {
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if fi.IsDir() {
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return nil
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}
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return fmt.Errorf("mkdirAll(%s): entry exists but is not a directory", dir)
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}
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// create parent directories
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errMkdirAll := r.mkdirAll(filepath.Dir(dir), dirMode)
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// create directory
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errMkdir := r.c.Mkdir(dir)
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// test if directory was created successfully
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fi, err = r.c.Lstat(dir)
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if err != nil {
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// return previous errors
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return fmt.Errorf("mkdirAll(%s): unable to create directories: %v, %v", errMkdirAll, errMkdir)
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}
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if !fi.IsDir() {
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return fmt.Errorf("mkdirAll(%s): entry exists but is not a directory", dir)
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}
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// set mode
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return r.c.Chmod(dir, mode)
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}
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// Rename temp file to final name according to type and ID.
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func (r *SFTP) renameFile(filename string, t Type, id ID) error {
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return r.c.Rename(filename, filepath.Join(r.dir(t), id.String()))
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func (r *SFTP) renameFile(oldname string, t Type, id ID) error {
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newname := r.filename(t, id)
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// create directories if necessary
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if t == Data || t == Tree {
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err := r.mkdirAll(filepath.Dir(newname), dirMode)
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if err != nil {
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return err
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}
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}
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return r.c.Rename(oldname, newname)
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}
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// Construct directory for given Type.
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func (r *SFTP) dir(t Type) string {
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func (r *SFTP) dirname(t Type, id ID) string {
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var n string
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switch t {
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case Data:
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n = dataPath
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if id != nil {
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n = filepath.Join(dataPath, fmt.Sprintf("%02x", id[0]), fmt.Sprintf("%02x", id[1]))
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}
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case Snapshot:
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n = snapshotPath
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case Tree:
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n = treePath
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if id != nil {
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n = filepath.Join(treePath, fmt.Sprintf("%02x", id[0]), fmt.Sprintf("%02x", id[1]))
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}
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case Map:
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n = mapPath
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case Lock:
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@ -257,7 +301,12 @@ func (r *SFTP) Create(t Type, data []byte) (ID, error) {
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// check if blob is already present in backend
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id := IDFromData(data)
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if ok, _ := r.Test(t, id); ok {
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res, err := r.Test(t, id)
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if err != nil {
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return nil, arrar.Annotate(err, "test for presence")
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}
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if res {
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return id, ErrAlreadyPresent
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}
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@ -289,7 +338,7 @@ func (r *SFTP) Create(t Type, data []byte) (ID, error) {
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// Construct path for given Type and ID.
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func (r *SFTP) filename(t Type, id ID) string {
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return filepath.Join(r.dir(t), id.String())
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return filepath.Join(r.dirname(t, id), id.String())
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}
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// Get returns the content stored under the given ID. If the data doesn't match
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@ -325,10 +374,15 @@ func (r *SFTP) Test(t Type, id ID) (bool, error) {
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}
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}()
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if err == nil {
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return true, nil
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if err != nil {
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if _, ok := err.(*sftp.StatusError); ok {
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return false, nil
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}
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return false, err
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}
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return false, err
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return true, nil
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}
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// Remove removes the content stored at ID.
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@ -338,9 +392,42 @@ func (r *SFTP) Remove(t Type, id ID) error {
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// List lists all objects of a given type.
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func (r *SFTP) List(t Type) (IDs, error) {
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list, err := r.c.ReadDir(r.dir(t))
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if err != nil {
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return nil, err
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list := []os.FileInfo{}
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var err error
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if t == Data || t == Tree {
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// read first level
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basedir := r.dirname(t, nil)
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list1, err := r.c.ReadDir(basedir)
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if err != nil {
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return nil, err
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}
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for _, dir1 := range list1 {
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// read second level
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list2, err := r.c.ReadDir(filepath.Join(basedir, dir1.Name()))
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if err != nil {
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return nil, err
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}
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// read files
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for _, dir2 := range list2 {
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entries, err := r.c.ReadDir(filepath.Join(basedir, dir1.Name(), dir2.Name()))
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if err != nil {
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return nil, err
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}
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for _, entry := range entries {
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list = append(list, entry)
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}
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}
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}
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} else {
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list, err = r.c.ReadDir(r.dirname(t, nil))
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if err != nil {
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return nil, err
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}
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}
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ids := make(IDs, 0, len(list))
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