[#2210] services/tree: Drop messages not in queue

Currently, under high load clients are blocked on channel send
and the number of goroutines can increase indefinitely.
In this commit we drop replication messages if send/recv queue is full
and rely on a background synchronization.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/services/tree/replicator.go

@@ -148,7 +148,7 @@ func (s *Service) pushToQueue(cid cidSDK.ID, treeID string, op *pilorama.LogMove
 		treeID: treeID,
 		op:     op,
 	}:
-	case <-s.closeCh:
+	default:
 	}
 }
 

pkg/services/tree/service.go

@@ -485,7 +485,8 @@ func (s *Service) Apply(_ context.Context, req *ApplyRequest) (*ApplyResponse, e
 		return nil, fmt.Errorf("can't parse meta-information: %w", err)
 	}
 
-	s.replicateLocalCh <- applyOp{
+	select {
+	case s.replicateLocalCh <- applyOp{
 		treeID:        req.GetBody().GetTreeId(),
 		CIDDescriptor: pilorama.CIDDescriptor{CID: cid, Position: pos, Size: size},
 		Move: pilorama.Move{
@@ -493,6 +494,8 @@ func (s *Service) Apply(_ context.Context, req *ApplyRequest) (*ApplyResponse, e
 			Child:  op.GetChildId(),
 			Meta:   meta,
 		},
+	}:
+	default:
 	}
 	return &ApplyResponse{Body: &ApplyResponse_Body{}, Signature: &Signature{}}, nil
 }