[#85] Fix get latest version node

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

tree/tree.go

@@ -73,6 +73,7 @@ type Meta interface {
 
 type NodeResponse interface {
 	GetMeta() []Meta
+	GetTimestamp() uint64
 }
 
 func newTreeNode(nodeInfo NodeResponse) (*treeNode, error) {
@@ -135,7 +136,7 @@ func (c *Tree) GetLatestVersion(ctx context.Context, cnrID *cid.ID, objectName s
 		TreeID:     versionTree,
 		Path:       path,
 		Meta:       meta,
-		LatestOnly: true,
+		LatestOnly: false,
 		AllAttrs:   false,
 	}
 	nodes, err := c.service.GetNodes(ctx, p)
@@ -143,11 +144,43 @@ func (c *Tree) GetLatestVersion(ctx context.Context, cnrID *cid.ID, objectName s
 		return nil, err
 	}
 
-	if len(nodes) == 0 {
+	latestNode, err := getLatestNode(nodes)
+	if err != nil {
+		return nil, err
+	}
+
+	return newNodeVersion(latestNode)
+}
+
+func getLatestNode(nodes []NodeResponse) (NodeResponse, error) {
+	var (
+		maxCreationTime uint64
+		targetIndexNode = -1
+	)
+
+	for i, node := range nodes {
+		currentCreationTime := node.GetTimestamp()
+		if checkExistOID(node.GetMeta()) && currentCreationTime > maxCreationTime {
+			maxCreationTime = currentCreationTime
+			targetIndexNode = i
+		}
+	}
+
+	if targetIndexNode == -1 {
 		return nil, layer.ErrNodeNotFound
 	}
 
-	return newNodeVersion(nodes[0])
+	return nodes[targetIndexNode], nil
+}
+
+func checkExistOID(meta []Meta) bool {
+	for _, kv := range meta {
+		if kv.GetKey() == "OID" {
+			return true
+		}
+	}
+
+	return false
 }
 
 // pathFromName splits name by '/'.