store blobs on disk in prefix-based subdirectories to avoid too many files in one dir
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parent
acb9840871
commit
24f885e268
1 changed files with 29 additions and 18 deletions
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@ -10,18 +10,32 @@ import (
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// FileBlobStore is a local disk store.
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type FileBlobStore struct {
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dir string
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// the location of blobs on disk
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blobDir string
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// store files in subdirectories based on the first N chars in the filename. 0 = don't create subdirectories.
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prefixLength int
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initialized bool
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}
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// NewFileBlobStore returns an initialized file disk store pointer.
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func NewFileBlobStore(dir string) *FileBlobStore {
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return &FileBlobStore{dir: dir}
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func NewFileBlobStore(dir string, prefixLength int) *FileBlobStore {
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return &FileBlobStore{blobDir: dir, prefixLength: prefixLength}
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}
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func (f *FileBlobStore) dir(hash string) string {
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if f.prefixLength <= 0 || len(hash) < f.prefixLength {
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return f.blobDir
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}
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return path.Join(f.blobDir, hash[:f.prefixLength])
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}
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func (f *FileBlobStore) path(hash string) string {
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return path.Join(f.dir, hash)
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return path.Join(f.dir(hash), hash)
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}
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func (f *FileBlobStore) ensureDirExists(dir string) error {
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return errors.Err(os.MkdirAll(dir, 0755))
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}
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func (f *FileBlobStore) initOnce() error {
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@ -29,17 +43,9 @@ func (f *FileBlobStore) initOnce() error {
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return nil
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}
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if stat, err := os.Stat(f.dir); err != nil {
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if os.IsNotExist(err) {
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err2 := os.Mkdir(f.dir, 0755)
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if err2 != nil {
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return err2
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}
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} else {
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return err
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}
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} else if !stat.IsDir() {
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return errors.Err("blob dir exists but is not a dir")
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err := f.ensureDirExists(f.blobDir)
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if err != nil {
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return err
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}
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f.initialized = true
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@ -67,15 +73,15 @@ func (f *FileBlobStore) Has(hash string) (bool, error) {
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func (f *FileBlobStore) Get(hash string) ([]byte, error) {
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err := f.initOnce()
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if err != nil {
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return []byte{}, err
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return nil, err
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}
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file, err := os.Open(f.path(hash))
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if err != nil {
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if os.IsNotExist(err) {
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return []byte{}, errors.Err(ErrBlobNotFound)
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return nil, errors.Err(ErrBlobNotFound)
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}
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return []byte{}, err
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return nil, err
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}
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return ioutil.ReadAll(file)
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@ -88,6 +94,11 @@ func (f *FileBlobStore) Put(hash string, blob []byte) error {
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return err
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}
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err = f.ensureDirExists(f.dir(hash))
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if err != nil {
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return err
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}
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return ioutil.WriteFile(f.path(hash), blob, 0644)
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}
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