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Reworked Backend.Load API to retry errors during ongoing download

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Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
This commit is contained in:
Igor Fedorenko
2018-01-16 23:59:16 -05:00
parent b723094739
commit d58ae43317
26 changed files with 388 additions and 257 deletions
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10
internal/backend/b2/b2.go
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@@ -142,9 +142,13 @@ func (be *b2Backend) IsNotExist(err error) bool {
return b2.IsNotExist(errors.Cause(err))
}
// Load returns the data stored in the backend for h at the given offset
// and saves it in p. Load has the same semantics as io.ReaderAt.
func (be *b2Backend) Load(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
// Load runs fn with a reader that yields the contents of the file at h at the
// given offset.
func (be *b2Backend) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
return backend.DefaultLoad(ctx, h, length, offset, be.openReader, fn)
}
func (be *b2Backend) openReader(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
debug.Log("Load %v, length %v, offset %v from %v", h, length, offset, be.Filename(h))
if err := h.Valid(); err != nil {
return nil, err