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Developer option: extra blob paths (#4566)

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* Allow additional read-only blob paths
* Add developer option to add more blob sources
* Add makefile targets to start and remove build container
* Documentation
This commit is contained in:
WithoutPants
2024-02-16 12:39:45 +11:00
committed by GitHub
parent 8fc997dfe9
commit 440c261f5b
6 changed files with 144 additions and 65 deletions
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114
pkg/sqlite/blob/fs.go
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@@ -19,65 +19,34 @@ const (
blobsDirLength int = 2 // thumbDirDepth * thumbDirLength must be smaller than the length of checksum
)
type FS interface {
type FSReader interface {
Open(name string) (fs.ReadDirFile, error)
}
type FSWriter interface {
Create(name string) (*os.File, error)
MkdirAll(path string, perm fs.FileMode) error
Open(name string) (fs.ReadDirFile, error)
Remove(name string) error
file.RenamerRemover
}
type FilesystemStore struct {
deleter *file.Deleter
path string
fs FS
type FS interface {
FSReader
FSWriter
}
func NewFilesystemStore(path string, fs FS) *FilesystemStore {
deleter := &file.Deleter{
RenamerRemover: fs,
}
return &FilesystemStore{
deleter: deleter,
path: path,
fs: fs,
}
type FilesystemReader struct {
path string
fs FSReader
}
func (s *FilesystemStore) checksumToPath(checksum string) string {
func (s *FilesystemReader) checksumToPath(checksum string) string {
return filepath.Join(s.path, fsutil.GetIntraDir(checksum, blobsDirDepth, blobsDirLength), checksum)
}
func (s *FilesystemStore) Write(ctx context.Context, checksum string, data []byte) error {
if s.path == "" {
return fmt.Errorf("no path set")
}
fn := s.checksumToPath(checksum)
// create the directory if it doesn't exist
if err := s.fs.MkdirAll(filepath.Dir(fn), 0755); err != nil {
return fmt.Errorf("creating directory %q: %w", filepath.Dir(fn), err)
}
logger.Debugf("Writing blob file %s", fn)
out, err := s.fs.Create(fn)
if err != nil {
return fmt.Errorf("creating file %q: %w", fn, err)
}
r := bytes.NewReader(data)
if _, err = io.Copy(out, r); err != nil {
return fmt.Errorf("writing file %q: %w", fn, err)
}
return nil
}
func (s *FilesystemStore) Read(ctx context.Context, checksum string) ([]byte, error) {
func (s *FilesystemReader) Read(ctx context.Context, checksum string) ([]byte, error) {
if s.path == "" {
return nil, fmt.Errorf("no path set")
}
@@ -93,6 +62,61 @@ func (s *FilesystemStore) Read(ctx context.Context, checksum string) ([]byte, er
return io.ReadAll(f)
}
type FilesystemStore struct {
FilesystemReader
deleter *file.Deleter
}
func NewFilesystemStore(path string, fs FS) *FilesystemStore {
deleter := &file.Deleter{
RenamerRemover: fs,
}
return &FilesystemStore{
FilesystemReader: *NewReadonlyFilesystemStore(path, fs),
deleter: deleter,
}
}
func NewReadonlyFilesystemStore(path string, fs FSReader) *FilesystemReader {
return &FilesystemReader{
path: path,
fs: fs,
}
}
func (s *FilesystemStore) Write(ctx context.Context, checksum string, data []byte) error {
fs, ok := s.fs.(FS)
if !ok {
return fmt.Errorf("internal error: fs is not an FS")
}
if s.path == "" {
return fmt.Errorf("no path set")
}
fn := s.checksumToPath(checksum)
// create the directory if it doesn't exist
if err := fs.MkdirAll(filepath.Dir(fn), 0755); err != nil {
return fmt.Errorf("creating directory %q: %w", filepath.Dir(fn), err)
}
logger.Debugf("Writing blob file %s", fn)
out, err := fs.Create(fn)
if err != nil {
return fmt.Errorf("creating file %q: %w", fn, err)
}
r := bytes.NewReader(data)
if _, err = io.Copy(out, r); err != nil {
return fmt.Errorf("writing file %q: %w", fn, err)
}
return nil
}
func (s *FilesystemStore) Delete(ctx context.Context, checksum string) error {
if s.path == "" {
return fmt.Errorf("no path set")