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package storage
import (
"io"
"github.com/git-lfs/gitobj/v2/errors"
)
// Storage implements an interface for reading, but not writing, objects in an
// object database.
type multiStorage struct {
impls []Storage
}
func MultiStorage(args ...Storage) Storage {
return &multiStorage{impls: args}
}
// Open returns a handle on an existing object keyed by the given object
// ID. It returns an error if that file does not already exist.
func (m *multiStorage) Open(oid []byte) (f io.ReadCloser, err error) {
for _, s := range m.impls {
f, err := s.Open(oid)
if err != nil {
if errors.IsNoSuchObject(err) {
continue
}
return nil, err
}
if s.IsCompressed() {
return newDecompressingReadCloser(f)
}
return f, nil
}
return nil, errors.NoSuchObject(oid)
}
// Close closes the filesystem, after which no more operations are
// allowed.
func (m *multiStorage) Close() error {
for _, s := range m.impls {
if err := s.Close(); err != nil {
return err
}
}
return nil
}
// Compressed indicates whether data read from this storage source will
// be zlib-compressed.
func (m *multiStorage) IsCompressed() bool {
// To ensure we can read from any Storage type, we automatically
// decompress items if they need it.
return false
}
|
