frostfs-node/pkg/services/object/range/local.go

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package rangesvc
import (
"io"
"github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/localstore"
"github.com/pkg/errors"
)
type localRangeWriter struct {
addr *object.Address
rng *object.Range
storage *localstore.Storage
}
func (l *localRangeWriter) WriteTo(w io.Writer) (int64, error) {
obj, err := l.storage.Get(l.addr)
if err != nil {
return 0, errors.Wrapf(err, "(%T) could not get object from local storage", l)
}
payload := obj.Payload()
left := l.rng.GetOffset()
right := left + l.rng.GetLength()
if ln := uint64(len(payload)); ln < right {
return 0, errors.Errorf("(%T) object range is out-of-boundaries (size %d, range [%d:%d]", l, ln, left, right)
}
n, err := w.Write(payload[left:right])
return int64(n), err
}