[#1635] control: Add method to search shards by object

Added method `ListShardsForObject` to ControlService and to
StorageEngine. It returns information about shards storing
object on the node.

Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>

pkg/services/control/server/list_shards_for_object.go

@@ -0,0 +1,66 @@
+package control
+
+import (
+	"context"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control/server/ctrlmessage"
+
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func (s *Server) ListShardsForObject(ctx context.Context, req *control.ListShardsForObjectRequest) (*control.ListShardsForObjectResponse, error) {
+	err := s.isValidRequest(req)
+	if err != nil {
+		return nil, status.Error(codes.PermissionDenied, err.Error())
+	}
+
+	var obj oid.ID
+	err = obj.DecodeString(req.GetBody().GetObjectId())
+	if err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	var cnr cid.ID
+	err = cnr.DecodeString(req.GetBody().GetContainerId())
+	if err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	resp := new(control.ListShardsForObjectResponse)
+	body := new(control.ListShardsForObjectResponse_Body)
+	resp.SetBody(body)
+
+	var objAddr oid.Address
+	objAddr.SetContainer(cnr)
+	objAddr.SetObject(obj)
+	info, err := s.s.ListShardsForObject(ctx, objAddr)
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+	if len(info) == 0 {
+		return nil, status.Error(codes.NotFound, logs.ShardCouldNotFindObject)
+	}
+
+	body.SetShard_ID(shardInfoToProto(info))
+
+	// Sign the response
+	if err := ctrlmessage.Sign(s.key, resp); err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+	return resp, nil
+}
+
+func shardInfoToProto(infos []shard.Info) [][]byte {
+	shardInfos := make([][]byte, 0, len(infos))
+	for _, info := range infos {
+		shardInfos = append(shardInfos, *info.ID)
+	}
+
+	return shardInfos
+}