[#1523] local_object_storage: Move blobovnicza tree to a separate package

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/local_object_storage/blobstor/get_range.go

@@ -0,0 +1,83 @@
+package blobstor
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/blobovniczatree"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/fstree"
+	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
+	objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
+)
+
+// GetRangeBigPrm groups the parameters of GetRangeBig operation.
+type GetRangeBigPrm struct {
+	address
+	rwRange
+}
+
+// GetRangeBigRes groups the resulting values of GetRangeBig operation.
+type GetRangeBigRes struct {
+	rangeData
+}
+
+// GetRangeBig reads data of object payload range from shallow dir of BLOB storage.
+//
+// Returns any error encountered that
+// did not allow to completely read the object payload range.
+//
+// Returns ErrRangeOutOfBounds if the requested object range is out of bounds.
+// Returns an error of type apistatus.ObjectNotFound if object is missing.
+func (b *BlobStor) GetRangeBig(prm GetRangeBigPrm) (GetRangeBigRes, error) {
+	// get compressed object data
+	data, err := b.fsTree.Get(prm.addr)
+	if err != nil {
+		if errors.Is(err, fstree.ErrFileNotFound) {
+			var errNotFound apistatus.ObjectNotFound
+
+			return GetRangeBigRes{}, errNotFound
+		}
+
+		return GetRangeBigRes{}, fmt.Errorf("could not read object from fs tree: %w", err)
+	}
+
+	data, err = b.Decompress(data)
+	if err != nil {
+		return GetRangeBigRes{}, fmt.Errorf("could not decompress object data: %w", err)
+	}
+
+	// unmarshal the object
+	obj := objectSDK.New()
+	if err := obj.Unmarshal(data); err != nil {
+		return GetRangeBigRes{}, fmt.Errorf("could not unmarshal the object: %w", err)
+	}
+
+	payload := obj.Payload()
+	ln, off := prm.rng.GetLength(), prm.rng.GetOffset()
+
+	if pLen := uint64(len(payload)); ln+off < off || pLen < off || pLen < ln+off {
+		var errOutOfRange apistatus.ObjectOutOfRange
+
+		return GetRangeBigRes{}, errOutOfRange
+	}
+
+	return GetRangeBigRes{
+		rangeData: rangeData{
+			data: payload[off : off+ln],
+		},
+	}, nil
+}
+
+// GetRangeSmall reads data of object payload range from blobovnicza of BLOB storage.
+//
+// If blobovnicza ID is not set or set to nil, BlobStor tries to get payload range
+// from any blobovnicza.
+//
+// Returns any error encountered that
+// did not allow to completely read the object payload range.
+//
+// Returns ErrRangeOutOfBounds if the requested object range is out of bounds.
+// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in blobovnicza(s).
+func (b *BlobStor) GetRangeSmall(prm blobovniczatree.GetRangeSmallPrm) (blobovniczatree.GetRangeSmallRes, error) {
+	return b.blobovniczas.GetRange(prm)
+}