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backend: move backend implementation helpers to util package

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This removes code that is only used within a backend implementation from
the backend package. The latter now only contains code that also has
external users.
This commit is contained in:
Michael Eischer 2023-10-01 10:24:33 +02:00
parent 8e6fdf5edf
commit 7881309d63
23 changed files with 158 additions and 135 deletions
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42
internal/backend/utils.go
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@ -58,48 +58,6 @@ func LimitReadCloser(r io.ReadCloser, n int64) *LimitedReadCloser {
return &LimitedReadCloser{Closer: r, LimitedReader: io.LimitedReader{R: r, N: n}}
}
// DefaultLoad implements Backend.Load using lower-level openReader func
func DefaultLoad(ctx context.Context, h restic.Handle, length int, offset int64,
openReader func(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error),
fn func(rd io.Reader) error) error {
rd, err := openReader(ctx, h, length, offset)
if err != nil {
return err
}
err = fn(rd)
if err != nil {
_ = rd.Close() // ignore secondary errors closing the reader
return err
}
return rd.Close()
}
// DefaultDelete removes all restic keys in the bucket. It will not remove the bucket itself.
func DefaultDelete(ctx context.Context, be restic.Backend) error {
alltypes := []restic.FileType{
restic.PackFile,
restic.KeyFile,
restic.LockFile,
restic.SnapshotFile,
restic.IndexFile}
for _, t := range alltypes {
err := be.List(ctx, t, func(fi restic.FileInfo) error {
return be.Remove(ctx, restic.Handle{Type: t, Name: fi.Name})
})
if err != nil {
return nil
}
}
err := be.Remove(ctx, restic.Handle{Type: restic.ConfigFile})
if err != nil && be.IsNotExist(err) {
err = nil
}
return err
}
type memorizedLister struct {
fileInfos []restic.FileInfo
tpe restic.FileType