func NewGetter(getter storage.Getter, feed *Feed) *Getter {
	return &Getter{getter, feed}
}
NewGetter constructs a feed Getter
package feeds
import (
	"context"
	"encoding/binary"
	"fmt"
	"time"
	"github.com/ethsana/sana/pkg/soc"
	"github.com/ethsana/sana/pkg/storage"
	"github.com/ethsana/sana/pkg/swarm"
)
type Lookup interface {
	At(ctx context.Context, at, after int64) (chunk swarm.Chunk, currentIndex, nextIndex Index, err error)
}
type Getter struct {
	getter storage.Getter
	*Feed
}