[#74] service/tree: Add logger

Log error instead of failing when multiple unversioned nodes are found

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/handler/handlers_test.go

@@ -121,7 +121,7 @@ func prepareHandlerContext(t *testing.T) *handlerContext {
 func NewTreeServiceMock(t *testing.T) *tree.Tree {
 	memCli, err := tree.NewTreeServiceClientMemory()
 	require.NoError(t, err)
-	return tree.NewTree(memCli)
+	return tree.NewTree(memCli, zap.NewExample())
 }
 
 func createTestBucket(hc *handlerContext, bktName string) *data.BucketInfo {

cmd/s3-gw/app.go

@@ -119,7 +119,7 @@ func (a *App) initLayer(ctx context.Context) {
 	if err != nil {
 		a.log.Fatal("failed to create tree service", zap.Error(err))
 	}
-	treeService := tree.NewTree(treeGRPCClient)
+	treeService := tree.NewTree(treeGRPCClient, a.log)
 	a.log.Info("init tree service", zap.Strings("endpoints", treeGRPCClient.Endpoints()))
 
 	// prepare random key for anonymous requests

pkg/service/tree/tree.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"sort"
 	"strconv"
 	"strings"
 	"time"
@@ -12,11 +13,13 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	"go.uber.org/zap"
 )
 
 type (
 	Tree struct {
 		service ServiceClient
+		log     *zap.Logger
 	}
 
 	// ServiceClient is a client to interact with tree service.
@@ -104,8 +107,11 @@ const (
 )
 
 // NewTree creates instance of Tree using provided address and create grpc connection.
-func NewTree(service ServiceClient) *Tree {
+func NewTree(service ServiceClient, log *zap.Logger) *Tree {
-	return &Tree{service: service}
+	return &Tree{
+		service: service,
+		log:     log,
+	}
 }
 
 type Meta interface {
@@ -811,14 +817,19 @@ func (c *Tree) getUnversioned(ctx context.Context, bktInfo *data.BucketInfo, tre
 		return nil, err
 	}
 
-	if len(nodes) > 1 {
+	if len(nodes) == 0 {
-		return nil, fmt.Errorf("found more than one unversioned node")
-	}
-
-	if len(nodes) != 1 {
 		return nil, layer.ErrNodeNotFound
 	}
 
+	if len(nodes) > 1 {
+		c.log.Debug("found more than one unversioned node", zap.Stringer("cid", bktInfo.CID),
+			zap.String("treeID", treeID), zap.String("filepath", filepath))
+	}
+
+	sort.Slice(nodes, func(i, j int) bool {
+		return nodes[i].Timestamp > nodes[j].Timestamp
+	})
+
 	return nodes[0], nil
 }
 

pkg/service/tree/tree_test.go

@@ -8,6 +8,7 @@ import (
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
 )
 
 func TestLockConfigurationEncoding(t *testing.T) {
@@ -102,7 +103,7 @@ func TestTreeServiceSettings(t *testing.T) {
 
 	memCli, err := NewTreeServiceClientMemory()
 	require.NoError(t, err)
-	treeService := NewTree(memCli)
+	treeService := NewTree(memCli, zaptest.NewLogger(t))
 
 	bktInfo := &data.BucketInfo{
 		CID: cidtest.ID(),
@@ -134,7 +135,7 @@ func TestTreeServiceAddVersion(t *testing.T) {
 
 	memCli, err := NewTreeServiceClientMemory()
 	require.NoError(t, err)
-	treeService := NewTree(memCli)
+	treeService := NewTree(memCli, zaptest.NewLogger(t))
 
 	bktInfo := &data.BucketInfo{
 		CID: cidtest.ID(),