working commit

app/storage/storage.go

@@ -1,6 +1,7 @@
 package storage
 
 import (
+	"bytes"
 	"crypto/sha256"
 	"encoding/hex"
 	"errors"
@@ -309,7 +310,7 @@ func (store *Storage) WriteBlob(digest string, source io.Reader) (int64, string,
 	return recsize, recsum, err
 }
 
-func (st *Storage) BlobFileExists(digest string) (bool, int64, error) {
+func (st *Storage) BlobExists(digest string) (bool, int64, error) {
 	var err error
 	var fileSize int64
 
@@ -326,3 +327,40 @@ func (st *Storage) BlobFileExists(digest string) (bool, int64, error) {
 	fileSize = fileStat.Size()
 	return true, fileSize, err
 }
+
+func (store *Storage) BlobReader(digest string) (int64, io.ReadCloser, error) {
+	var err error
+	var filesize int64
+	blobpath := store.makeBlobpath(digest)
+
+	emptyReadCloser := io.NopCloser(bytes.NewReader(nil))
+
+	file, err := os.OpenFile(blobpath, os.O_RDONLY, 0)
+	if err != nil {
+		return filesize, emptyReadCloser, err
+	}
+	defer func() {
+		if err != nil {
+			file.Close()
+		}
+	}()
+	filestat, err := file.Stat()
+	if err != nil {
+		return filesize, emptyReadCloser, err
+	}
+	filesize = filestat.Size()
+	return filesize, file, err
+}
+
+func (store *Storage) DeleteBlob(digest string) error {
+	var err error
+	blobpath := store.makeBlobpath(digest)
+	err = os.Remove(blobpath)
+	if errors.Is(err, os.ErrNotExist) {
+		err = nil
+	}
+	if err != nil {
+		return err
+	}
+	return err
+}