app/imageoper, app/maindb: one image - one arch; app/storage: blob to name subdir

app/storage/blob.go

@@ -0,0 +1,211 @@
+/*
+ * Copyright 2026 Oleg Borodin <onborodin@gmail.com>
+ *
+ * This work is published and licensed under a Creative Commons
+ * Attribution-NonCommercial-NoDerivatives 4.0 International License.
+ *
+ * Distribution of this work is permitted, but commercial use and
+ * modifications are strictly prohibited.
+ */
+package storage
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+const (
+	upsubdir   = "uploads"
+	blobsubdir = "blobs"
+)
+
+func (store *Storage) makeUppath(upname string) string {
+	return filepath.Join(store.basepath, upsubdir, upname) + ".bin"
+}
+
+func (store *Storage) makeUpsubdir() string {
+	return filepath.Join(store.basepath, upsubdir)
+}
+
+func (store *Storage) makeBlobpath(name, digstr string) string {
+	return filepath.Join(store.basepath, blobsubdir, name, digstr) + ".bin"
+}
+
+func (store *Storage) makeBlobsubdir(name string) string {
+	return filepath.Join(store.basepath, blobsubdir, name)
+}
+
+func (store *Storage) WriteUpload(upID string, source io.Reader) (int64, error) {
+	var err error
+	var recsize int64
+
+	uploadDir := store.makeUpsubdir()
+	_, err = os.Stat(uploadDir)
+	if os.IsNotExist(err) {
+		err = os.MkdirAll(uploadDir, 0750)
+		if err != nil {
+			return recsize, err
+		}
+	}
+	if err != nil {
+		return recsize, err
+	}
+	upPath := store.makeUppath(upID)
+	upFile, err := os.OpenFile(upPath, os.O_WRONLY|os.O_CREATE, 0644)
+	if err != nil {
+		return recsize, err
+	}
+	defer upFile.Close()
+	recsize, err = io.Copy(upFile, source)
+	if err != nil {
+		return recsize, err
+	}
+	return recsize, err
+}
+
+func (store *Storage) LinkUpload(reference, name, digest string) error {
+	var err error
+	upPath := store.makeUppath(reference)
+
+	blobdir := store.makeBlobsubdir(name)
+	_, err = os.Stat(blobdir)
+	if errors.Is(err, os.ErrNotExist) {
+		err = os.MkdirAll(blobdir, 0750)
+		if err != nil {
+			return err
+		}
+	}
+	if err != nil {
+		return err
+	}
+	blobPath := store.makeBlobpath(name, digest)
+	_, err = os.Stat(blobPath)
+	if err == nil {
+		err = os.Remove(blobPath)
+		if err != nil {
+			return err
+		}
+	}
+	if os.IsNotExist(err) {
+		err = nil
+	}
+	if err != nil {
+		return err
+	}
+	err = os.Link(upPath, blobPath)
+	if err != nil {
+		return err
+	}
+	err = os.Remove(upPath)
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (store *Storage) RemoveUpload(digest string) error {
+	var err error
+	upPath := store.makeUppath(digest)
+	err = os.Remove(upPath)
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (st *Storage) UploadExists(name, reference string) (bool, int64, error) {
+	var err error
+	var size int64
+	upPath := st.makeUppath(reference)
+	fileStat, err := os.Stat(upPath)
+	if errors.Is(err, os.ErrNotExist) {
+		return false, 0, nil
+	}
+	if err != nil {
+		return false, 0, err
+	}
+	size = fileStat.Size()
+	return true, size, err
+}
+
+func (store *Storage) WriteBlob(name, digstr string, source io.Reader) (int64, error) {
+	var err error
+	var size int64
+	blobDir := store.makeBlobsubdir(name)
+	_, err = os.Stat(blobDir)
+	if os.IsNotExist(err) {
+		err = os.MkdirAll(blobDir, 0750)
+		if err != nil {
+			return size, err
+		}
+	}
+	if err != nil {
+		return size, err
+	}
+	blobPath := store.makeBlobpath(name, digstr)
+	blobFile, err := os.OpenFile(blobPath, os.O_WRONLY|os.O_CREATE, 0644)
+	if err != nil {
+		return size, err
+	}
+	defer blobFile.Close()
+	size, err = io.Copy(blobFile, source)
+	if err != nil {
+		return size, err
+	}
+	return size, err
+}
+
+func (st *Storage) BlobExists(name, digest string) (bool, int64, error) {
+	var err error
+	var size int64
+
+	blobPath := st.makeBlobpath(name, digest)
+	fileStat, err := os.Stat(blobPath)
+	if os.IsNotExist(err) {
+		return false, 0, nil
+	}
+	if err != nil {
+		return false, 0, err
+	}
+	size = fileStat.Size()
+	return true, size, err
+}
+
+func (store *Storage) BlobReader(name, digest string) (int64, io.ReadCloser, error) {
+	var err error
+	var size int64
+	blobPath := store.makeBlobpath(name, digest)
+	nop := io.NopCloser(bytes.NewReader(nil))
+	file, err := os.OpenFile(blobPath, os.O_RDONLY, 0)
+	if err != nil {
+		return size, nop, err
+	}
+	defer func() {
+		if err != nil {
+			file.Close()
+		}
+	}()
+	filestat, err := file.Stat()
+	if err != nil {
+		return size, nop, err
+	}
+	size = filestat.Size()
+	return size, file, err
+}
+
+func (store *Storage) DeleteBlob(name, digest string) error {
+	var err error
+	blobPath := store.makeBlobpath(name, digest)
+	err = os.Remove(blobPath)
+	if os.IsNotExist(err) {
+		err = nil
+	}
+	if err != nil {
+		return err
+	}
+	// TODO: remove dirs
+	return err
+}