[#1611] tree: Replicate operation at least on one remote node

These changes prevent possible DU when `pilorama` became unavailable on the node.

Change-Id: I6fec6c2ea20b0c59f6c35c1da5da4f70865fac4b
Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/services/tree/replicator.go

@@ -1,6 +1,7 @@
 package tree
 
 import (
+	"bytes"
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
@@ -22,6 +23,7 @@ type movePair struct {
 	cid    cidSDK.ID
 	treeID string
 	op     *pilorama.Move
+	excPub []byte
 }
 
 type replicationTask struct {
@@ -178,19 +180,48 @@ func (s *Service) replicate(ctx context.Context, op movePair) error {
 	}
 
 	for i := range nodes {
-		if i != localIndex {
+		if i != localIndex && !bytes.Equal(nodes[i].PublicKey(), op.excPub) {
 			s.replicationTasks <- replicationTask{nodes[i], req}
 		}
 	}
 	return nil
 }
 
-func (s *Service) pushToQueue(cid cidSDK.ID, treeID string, op *pilorama.Move) {
+func (s *Service) replicateToRemoteNode(ctx context.Context, op movePair,
+	nodes []netmapSDK.NodeInfo, localIndex int,
+) ([]byte, error) {
+	req := newApplyRequest(&op)
+	err := SignMessage(req, s.key)
+	if err != nil {
+		return nil, fmt.Errorf("can't sign data: %w", err)
+	}
+
+	var errMulti error
+	for i := range nodes {
+		if i != localIndex {
+			select {
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			default:
+			}
+			err := s.ReplicateTreeOp(ctx, nodes[i], req)
+			if err != nil {
+				errMulti = errors.Join(errMulti, err)
+				continue
+			}
+			return nodes[i].PublicKey(), nil
+		}
+	}
+	return nil, errMulti
+}
+
+func (s *Service) pushToQueue(cid cidSDK.ID, treeID string, op *pilorama.Move, excPub []byte) {
 	select {
 	case s.replicateCh <- movePair{
 		cid:    cid,
 		treeID: treeID,
 		op:     op,
+		excPub: excPub,
 	}:
 	default:
 	}