[#122] Add versioning cache

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/cache/bucket.go

@@ -0,0 +1,64 @@
+package cache
+
+import (
+	"time"
+
+	"github.com/bluele/gcache"
+	cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
+	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+)
+
+type (
+	// BucketCache provides interface for lru cache for objects.
+	BucketCache interface {
+		Get(key string) *BucketInfo
+		Put(bkt *BucketInfo) error
+		Delete(key string) bool
+	}
+
+	// BucketInfo stores basic bucket data.
+	BucketInfo struct {
+		Name    string
+		CID     *cid.ID
+		Owner   *owner.ID
+		Created time.Time
+	}
+
+	// GetBucketCache contains cache with objects and lifetime of cache entries.
+	GetBucketCache struct {
+		cache    gcache.Cache
+		lifetime time.Duration
+	}
+)
+
+// NewBucketCache creates an object of BucketCache.
+func NewBucketCache(cacheSize int, lifetime time.Duration) *GetBucketCache {
+	gc := gcache.New(cacheSize).LRU().Build()
+
+	return &GetBucketCache{cache: gc, lifetime: lifetime}
+}
+
+// Get returns cached object.
+func (o *GetBucketCache) Get(key string) *BucketInfo {
+	entry, err := o.cache.Get(key)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.(*BucketInfo)
+	if !ok {
+		return nil
+	}
+
+	return result
+}
+
+// Put puts an object to cache.
+func (o *GetBucketCache) Put(bkt *BucketInfo) error {
+	return o.cache.SetWithExpire(bkt.Name, bkt, o.lifetime)
+}
+
+// Delete deletes an object from cache.
+func (o *GetBucketCache) Delete(key string) bool {
+	return o.cache.Remove(key)
+}

api/cache/head_cache.go

@@ -0,0 +1,55 @@
+package cache
+
+import (
+	"time"
+
+	"github.com/bluele/gcache"
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+)
+
+// HeadObjectsCache provides interface for lru cache for objects.
+type HeadObjectsCache interface {
+	Get(key string) *object.Address
+	Put(key string, address *object.Address) error
+	Delete(key string) bool
+}
+
+type (
+	// HeadObjectCache contains cache with objects and lifetime of cache entries.
+	HeadObjectCache struct {
+		cache    gcache.Cache
+		lifetime time.Duration
+	}
+)
+
+// NewHeadObject creates an object of ObjectHeadersCache.
+func NewHeadObject(cacheSize int, lifetime time.Duration) *HeadObjectCache {
+	gc := gcache.New(cacheSize).LRU().Build()
+
+	return &HeadObjectCache{cache: gc, lifetime: lifetime}
+}
+
+// Get returns cached object.
+func (o *HeadObjectCache) Get(key string) *object.Address {
+	entry, err := o.cache.Get(key)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.(*object.Address)
+	if !ok {
+		return nil
+	}
+
+	return result
+}
+
+// Put puts an object to cache.
+func (o *HeadObjectCache) Put(key string, address *object.Address) error {
+	return o.cache.SetWithExpire(key, address, o.lifetime)
+}
+
+// Delete deletes an object from cache.
+func (o *HeadObjectCache) Delete(key string) bool {
+	return o.cache.Remove(key)
+}

api/cache/object_cache.go

@@ -10,7 +10,7 @@ import (
 // ObjectsCache provides interface for lru cache for objects.
 type ObjectsCache interface {
 	Get(address *object.Address) *object.Object
-	Put(address *object.Address, obj object.Object) error
+	Put(obj object.Object) error
 	Delete(address *object.Address) bool
 }
 
@@ -52,8 +52,8 @@ func (o *ObjectHeadersCache) Get(address *object.Address) *object.Object {
 }
 
 // Put puts an object to cache.
-func (o *ObjectHeadersCache) Put(address *object.Address, obj object.Object) error {
+func (o *ObjectHeadersCache) Put(obj object.Object) error {
-	return o.cache.SetWithExpire(address.String(), obj, o.lifetime)
+	return o.cache.SetWithExpire(obj.ContainerID().String()+"/"+obj.ID().String(), obj, o.lifetime)
 }
 
 // Delete deletes an object from cache.

api/cache/object_cache_test.go

@@ -4,6 +4,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+
 	objecttest "github.com/nspcc-dev/neofs-api-go/pkg/object/test"
 	"github.com/stretchr/testify/require"
 )
@@ -14,23 +16,23 @@ const (
 )
 
 func TestCache(t *testing.T) {
-	var (
+	obj := objecttest.Object()
-		address = objecttest.Address()
+	address := object.NewAddress()
-		object  = objecttest.Object()
+	address.SetContainerID(obj.ContainerID())
-	)
+	address.SetObjectID(obj.ID())
 
 	t.Run("check get", func(t *testing.T) {
 		cache := New(cachesize, lifetime)
-		err := cache.Put(address, *object)
+		err := cache.Put(*obj)
 		require.NoError(t, err)
 
 		actual := cache.Get(address)
-		require.Equal(t, object, actual)
+		require.Equal(t, obj, actual)
 	})
 
 	t.Run("check delete", func(t *testing.T) {
 		cache := New(cachesize, lifetime)
-		err := cache.Put(address, *object)
+		err := cache.Put(*obj)
 		require.NoError(t, err)
 
 		cache.Delete(address)

api/cache/system.go

@@ -0,0 +1,56 @@
+package cache
+
+import (
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+
+	"github.com/bluele/gcache"
+)
+
+type (
+	// SystemCache provides interface for lru cache for objects.
+	SystemCache interface {
+		Get(key string) *object.Object
+		Put(key string, obj *object.Object) error
+		Delete(key string) bool
+	}
+
+	// systemCache contains cache with objects and lifetime of cache entries.
+	systemCache struct {
+		cache    gcache.Cache
+		lifetime time.Duration
+	}
+)
+
+// NewSystemCache creates an object of SystemCache.
+func NewSystemCache(cacheSize int, lifetime time.Duration) SystemCache {
+	gc := gcache.New(cacheSize).LRU().Build()
+
+	return &systemCache{cache: gc, lifetime: lifetime}
+}
+
+// Get returns cached object.
+func (o *systemCache) Get(key string) *object.Object {
+	entry, err := o.cache.Get(key)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.(*object.Object)
+	if !ok {
+		return nil
+	}
+
+	return result
+}
+
+// Put puts an object to cache.
+func (o *systemCache) Put(key string, obj *object.Object) error {
+	return o.cache.SetWithExpire(key, obj, o.lifetime)
+}
+
+// Delete deletes an object from cache.
+func (o *systemCache) Delete(key string) bool {
+	return o.cache.Remove(key)
+}

api/handler/head.go

@@ -46,18 +46,22 @@ func (h *handler) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
 		h.logAndSendError(w, "could not fetch object info", reqInfo, err)
 		return
 	}
-	buffer := bytes.NewBuffer(make([]byte, 0, sizeToDetectType))
+
-	getParams := &layer.GetObjectParams{
+	if len(inf.ContentType) == 0 {
-		ObjectInfo: inf,
+		buffer := bytes.NewBuffer(make([]byte, 0, sizeToDetectType))
-		Writer:     buffer,
+		getParams := &layer.GetObjectParams{
-		Range:      getRangeToDetectContentType(inf.Size),
+			ObjectInfo: inf,
-		VersionID:  reqInfo.URL.Query().Get("versionId"),
+			Writer:     buffer,
+			Range:      getRangeToDetectContentType(inf.Size),
+			VersionID:  reqInfo.URL.Query().Get("versionId"),
+		}
+		if err = h.obj.GetObject(r.Context(), getParams); err != nil {
+			h.logAndSendError(w, "could not get object", reqInfo, err, zap.Stringer("oid", inf.ID()))
+			return
+		}
+		inf.ContentType = http.DetectContentType(buffer.Bytes())
 	}
-	if err = h.obj.GetObject(r.Context(), getParams); err != nil {
+
-		h.logAndSendError(w, "could not get object", reqInfo, err, zap.Stringer("oid", inf.ID()))
-		return
-	}
-	inf.ContentType = http.DetectContentType(buffer.Bytes())
 	writeHeaders(w.Header(), inf)
 	w.WriteHeader(http.StatusOK)
 }

api/handler/object_list.go

@@ -263,7 +263,7 @@ func encodeListObjectVersionsToResponse(info *layer.ListObjectVersionsInfo, buck
 	}
 
 	for _, prefix := range info.CommonPrefixes {
-		res.CommonPrefixes = append(res.CommonPrefixes, CommonPrefix{Prefix: *prefix})
+		res.CommonPrefixes = append(res.CommonPrefixes, CommonPrefix{Prefix: prefix})
 	}
 
 	for _, ver := range info.Version {

api/layer/container.go

@@ -11,37 +11,29 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
 	"github.com/nspcc-dev/neofs-api-go/pkg/container"
 	cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
-	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
 	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/nspcc-dev/neofs-s3-gw/api/cache"
 	"github.com/nspcc-dev/neofs-s3-gw/api/errors"
 	"github.com/nspcc-dev/neofs-sdk-go/pkg/pool"
 	"go.uber.org/zap"
 )
 
 type (
-	// BucketInfo stores basic bucket data.
-	BucketInfo struct {
-		Name     string
-		CID      *cid.ID
-		Owner    *owner.ID
-		Created  time.Time
-		BasicACL uint32
-	}
 	// BucketACL extends BucketInfo by eacl.Table.
 	BucketACL struct {
-		Info *BucketInfo
+		Info *cache.BucketInfo
 		EACL *eacl.Table
 	}
 )
 
-func (n *layer) containerInfo(ctx context.Context, cid *cid.ID) (*BucketInfo, error) {
+func (n *layer) containerInfo(ctx context.Context, cid *cid.ID) (*cache.BucketInfo, error) {
 	var (
 		err       error
 		res       *container.Container
 		rid       = api.GetRequestID(ctx)
 		bearerOpt = n.BearerOpt(ctx)
 
-		info = &BucketInfo{
+		info = &cache.BucketInfo{
 			CID:  cid,
 			Name: cid.String(),
 		}
@@ -82,10 +74,17 @@ func (n *layer) containerInfo(ctx context.Context, cid *cid.ID) (*BucketInfo, er
 		}
 	}
 
+	if err := n.bucketCache.Put(info); err != nil {
+		n.log.Warn("could not put bucket info into cache",
+			zap.Stringer("cid", cid),
+			zap.String("bucket_name", info.Name),
+			zap.Error(err))
+	}
+
 	return info, nil
 }
 
-func (n *layer) containerList(ctx context.Context) ([]*BucketInfo, error) {
+func (n *layer) containerList(ctx context.Context) ([]*cache.BucketInfo, error) {
 	var (
 		err       error
 		own       = n.Owner(ctx)
@@ -101,7 +100,7 @@ func (n *layer) containerList(ctx context.Context) ([]*BucketInfo, error) {
 		return nil, err
 	}
 
-	list := make([]*BucketInfo, 0, len(res))
+	list := make([]*cache.BucketInfo, 0, len(res))
 	for _, cid := range res {
 		info, err := n.containerInfo(ctx, cid)
 		if err != nil {

api/layer/detector.go

@@ -3,24 +3,56 @@ package layer
 import (
 	"io"
 	"net/http"
-	"sync"
 )
 
-type detector struct {
+type (
-	io.Reader
+	detector struct {
-	sync.Once
+		io.Reader
+		err  error
+		data []byte
+	}
+	errReader struct {
+		data   []byte
+		err    error
+		offset int
+	}
+)
 
-	contentType string
+const contentTypeDetectSize = 512
+
+func newReader(data []byte, err error) *errReader {
+	return &errReader{data: data, err: err}
 }
 
-func newDetector(r io.Reader) *detector {
+func (r *errReader) Read(b []byte) (int, error) {
-	return &detector{Reader: r}
+	if r.offset >= len(r.data) {
+		return 0, io.EOF
+	}
+	n := copy(b, r.data[r.offset:])
+	r.offset += n
+	if r.offset >= len(r.data) {
+		return n, r.err
+	}
+	return n, nil
 }
 
-func (d *detector) Read(data []byte) (int, error) {
+func newDetector(reader io.Reader) *detector {
-	d.Do(func() {
+	return &detector{
-		d.contentType = http.DetectContentType(data)
+		data:   make([]byte, contentTypeDetectSize),
-	})
+		Reader: reader,
-
+	}
-	return d.Reader.Read(data)
+}
+
+func (d *detector) Detect() (string, error) {
+	n, err := d.Reader.Read(d.data)
+	if err != nil && err != io.EOF {
+		d.err = err
+		return "", err
+	}
+	d.data = d.data[:n]
+	return http.DetectContentType(d.data), nil
+}
+
+func (d *detector) MultiReader() io.Reader {
+	return io.MultiReader(newReader(d.data, d.err), d.Reader)
 }

api/layer/layer.go

@@ -28,10 +28,13 @@ import (
 
 type (
 	layer struct {
-		pool         pool.Pool
+		pool        pool.Pool
-		log          *zap.Logger
+		log         *zap.Logger
-		listObjCache ObjectsListCache
+		listsCache  ObjectsListCache
-		objCache     cache.ObjectsCache
+		objCache    cache.ObjectsCache
+		headCache   cache.HeadObjectsCache
+		bucketCache cache.BucketCache
+		systemCache cache.SystemCache
 	}
 
 	// CacheConfig contains params for caches.
@@ -156,8 +159,8 @@ type (
 		PutBucketVersioning(ctx context.Context, p *PutVersioningParams) (*ObjectInfo, error)
 		GetBucketVersioning(ctx context.Context, name string) (*BucketSettings, error)
 
-		ListBuckets(ctx context.Context) ([]*BucketInfo, error)
+		ListBuckets(ctx context.Context) ([]*cache.BucketInfo, error)
-		GetBucketInfo(ctx context.Context, name string) (*BucketInfo, error)
+		GetBucketInfo(ctx context.Context, name string) (*cache.BucketInfo, error)
 		GetBucketACL(ctx context.Context, name string) (*BucketACL, error)
 		PutBucketACL(ctx context.Context, p *PutBucketACLParams) error
 		CreateBucket(ctx context.Context, p *CreateBucketParams) (*cid.ID, error)
@@ -228,26 +231,22 @@ func (v *objectVersions) getLast() *ObjectInfo {
 	return nil
 }
 
-func (v *objectVersions) getFiltered() []*ObjectVersionInfo {
+func (v *objectVersions) getFiltered() []*ObjectInfo {
 	if len(v.objects) == 0 {
 		return nil
 	}
 
 	v.sort()
 	existedVersions := getExistedVersions(v)
-	res := make([]*ObjectVersionInfo, 0, len(v.objects))
+	res := make([]*ObjectInfo, 0, len(v.objects))
 
 	for _, version := range v.objects {
 		delMark := version.Headers[versionsDeleteMarkAttr]
 		if contains(existedVersions, version.Version()) && (delMark == delMarkFullObject || delMark == "") {
-			res = append(res, &ObjectVersionInfo{Object: version})
+			res = append(res, version)
 		}
 	}
 
-	if len(res) > 0 {
-		res[len(res)-1].IsLatest = true
-	}
-
 	return res
 }
 
@@ -279,10 +278,14 @@ func (t *VersionedObject) String() string {
 // and establishes gRPC connection with node.
 func NewLayer(log *zap.Logger, conns pool.Pool, config *CacheConfig) Client {
 	return &layer{
-		pool:         conns,
+		pool:       conns,
-		log:          log,
+		log:        log,
-		listObjCache: newListObjectsCache(config.ListObjectsLifetime),
+		listsCache: newListObjectsCache(config.ListObjectsLifetime),
-		objCache:     cache.New(config.Size, config.Lifetime),
+		objCache:   cache.New(config.Size, config.Lifetime),
+		//todo reconsider cache params
+		headCache:   cache.NewHeadObject(1000, time.Minute),
+		bucketCache: cache.NewBucketCache(150, time.Minute),
+		systemCache: cache.NewSystemCache(1000, 5*time.Minute),
 	}
 }
 
@@ -320,12 +323,16 @@ func (n *layer) Get(ctx context.Context, address *object.Address) (*object.Objec
 }
 
 // GetBucketInfo returns bucket info by name.
-func (n *layer) GetBucketInfo(ctx context.Context, name string) (*BucketInfo, error) {
+func (n *layer) GetBucketInfo(ctx context.Context, name string) (*cache.BucketInfo, error) {
 	name, err := url.QueryUnescape(name)
 	if err != nil {
 		return nil, err
 	}
 
+	if bktInfo := n.bucketCache.Get(name); bktInfo != nil {
+		return bktInfo, nil
+	}
+
 	containerID := new(cid.ID)
 	if err := containerID.Parse(name); err != nil {
 		list, err := n.containerList(ctx)
@@ -374,7 +381,7 @@ func (n *layer) PutBucketACL(ctx context.Context, param *PutBucketACLParams) err
 
 // ListBuckets returns all user containers. Name of the bucket is a container
 // id. Timestamp is omitted since it is not saved in neofs container.
-func (n *layer) ListBuckets(ctx context.Context) ([]*BucketInfo, error) {
+func (n *layer) ListBuckets(ctx context.Context) ([]*cache.BucketInfo, error) {
 	return n.containerList(ctx)
 }
 
@@ -382,21 +389,12 @@ func (n *layer) ListBuckets(ctx context.Context) ([]*BucketInfo, error) {
 func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) error {
 	var err error
 
-	//if bkt, err = n.GetBucketInfo(ctx, p.Bucket); err != nil {
-	//	return fmt.Errorf("couldn't find bucket: %s : %w", p.Bucket, err)
-	//} else if oid, err = n.objectFindID(ctx, &findParams{cid: bkt.CID, val: p.Object}); err != nil {
-	//	return fmt.Errorf("search of the object failed: cid: %s, val: %s : %w", bkt.CID, p.Object, err)
-	//}
-
-	addr := object.NewAddress()
-	addr.SetObjectID(p.ObjectInfo.ID())
-	addr.SetContainerID(p.ObjectInfo.CID())
-
 	params := &getParams{
-		Writer:  p.Writer,
+		Writer: p.Writer,
-		address: addr,
+		cid:    p.ObjectInfo.CID(),
-		offset:  p.Offset,
+		oid:    p.ObjectInfo.ID(),
-		length:  p.Length,
+		offset: p.Offset,
+		length: p.Length,
 	}
 
 	if p.Range != nil {
@@ -411,7 +409,7 @@ func (n *layer) GetObject(ctx context.Context, p *GetObjectParams) error {
 	}
 
 	if err != nil {
-		n.objCache.Delete(addr)
+		n.objCache.Delete(p.ObjectInfo.Address())
 		return fmt.Errorf("couldn't get object, cid: %s : %w", p.ObjectInfo.CID(), err)
 	}
 
@@ -433,32 +431,26 @@ func (n *layer) GetObjectInfo(ctx context.Context, p *HeadObjectParams) (*Object
 	return n.headVersion(ctx, bkt, p.VersionID)
 }
 
-func (n *layer) getSettingsObjectInfo(ctx context.Context, bkt *BucketInfo) (*ObjectInfo, error) {
+func (n *layer) getSettingsObjectInfo(ctx context.Context, bkt *cache.BucketInfo) (*ObjectInfo, error) {
+	if meta := n.systemCache.Get(bktVersionSettingsObject); meta != nil {
+		return objInfoFromMeta(bkt, meta), nil
+	}
+
 	oid, err := n.objectFindID(ctx, &findParams{cid: bkt.CID, attr: objectSystemAttributeName, val: bktVersionSettingsObject})
 	if err != nil {
 		return nil, err
 	}
 
-	addr := object.NewAddress()
+	meta, err := n.objectHead(ctx, bkt.CID, oid)
-	addr.SetObjectID(oid)
+	if err != nil {
-	addr.SetContainerID(bkt.CID)
+		n.log.Error("could not fetch object head", zap.Error(err))
-
+		return nil, err
-	/* todo: now we get an address via request to NeoFS and try to find the object with the address in cache
+	}
-	 but it will be resolved after implementation of local cache with nicenames and address of objects
+	if err = n.systemCache.Put(bktVersionSettingsObject, meta); err != nil {
-	for get/head requests */
+		n.log.Error("couldn't cache system object", zap.Error(err))
-	meta := n.objCache.Get(addr)
-	if meta == nil {
-		meta, err = n.objectHead(ctx, bkt.CID, oid)
-		if err != nil {
-			n.log.Error("could not fetch object head", zap.Error(err))
-			return nil, err
-		}
-		if err = n.objCache.Put(addr, *meta); err != nil {
-			n.log.Error("couldn't cache an object", zap.Error(err))
-		}
 	}
 
-	return objectInfoFromMeta(bkt, meta, "", ""), nil
+	return objInfoFromMeta(bkt, meta), nil
 }
 
 // PutObject into storage.
@@ -496,7 +488,7 @@ func (n *layer) CopyObject(ctx context.Context, p *CopyObjectParams) (*ObjectInf
 }
 
 // DeleteObject removes all objects with passed nice name.
-func (n *layer) deleteObject(ctx context.Context, bkt *BucketInfo, obj *VersionedObject) error {
+func (n *layer) deleteObject(ctx context.Context, bkt *cache.BucketInfo, obj *VersionedObject) error {
 	var (
 		err error
 		ids []*object.ID
@@ -543,7 +535,7 @@ func (n *layer) deleteObject(ctx context.Context, bkt *BucketInfo, obj *Versione
 	return nil
 }
 
-func (n *layer) checkVersionsExists(ctx context.Context, bkt *BucketInfo, obj *VersionedObject) (*object.ID, error) {
+func (n *layer) checkVersionsExists(ctx context.Context, bkt *cache.BucketInfo, obj *VersionedObject) (*object.ID, error) {
 	id := object.NewID()
 	if err := id.Parse(obj.VersionID); err != nil {
 		return nil, &errors.DeleteError{Err: errors.GetAPIError(errors.ErrInvalidVersion), Object: obj.String()}
@@ -608,60 +600,70 @@ func (n *layer) DeleteBucket(ctx context.Context, p *DeleteBucketParams) error {
 }
 
 func (n *layer) ListObjectVersions(ctx context.Context, p *ListObjectVersionsParams) (*ListObjectVersionsInfo, error) {
-	res := ListObjectVersionsInfo{}
+	var versions map[string]*objectVersions
-	versions := make(map[string]*objectVersions)
+	res := &ListObjectVersionsInfo{}
 
 	bkt, err := n.GetBucketInfo(ctx, p.Bucket)
 	if err != nil {
 		return nil, err
 	}
-	ids, err := n.objectSearch(ctx, &findParams{cid: bkt.CID})
+
+	cacheKey, err := createKey(ctx, bkt.CID, listVersionsMethod, p.Prefix, p.Delimiter)
 	if err != nil {
 		return nil, err
 	}
 
-	for _, id := range ids {
+	allObjects := n.listsCache.Get(cacheKey)
-		meta, err := n.objectHead(ctx, bkt.CID, id)
+	if allObjects == nil {
+		versions, err = n.getAllObjectsVersions(ctx, bkt, p.Prefix, p.Delimiter)
 		if err != nil {
-			n.log.Warn("could not fetch object meta", zap.Error(err))
+			return nil, err
-			continue
 		}
-		if oi := objectInfoFromMeta(bkt, meta, p.Prefix, p.Delimiter); oi != nil {
-			if oi.Name <= p.KeyMarker {
-				continue
-			}
-			if isSystem(oi) {
-				continue
-			}
 
-			if objVersions, ok := versions[oi.Name]; ok {
+		sortedNames := make([]string, 0, len(versions))
-				objVersions.appendVersion(oi)
+		for k := range versions {
-				versions[oi.Name] = objVersions
+			sortedNames = append(sortedNames, k)
-			} else {
-				objVersion := newObjectVersions(oi.Name)
-				objVersion.appendVersion(oi)
-				versions[oi.Name] = objVersion
-			}
 		}
+		sort.Strings(sortedNames)
+
+		allObjects = make([]*ObjectInfo, 0, p.MaxKeys)
+		for _, name := range sortedNames {
+			allObjects = append(allObjects, versions[name].getFiltered()...)
+		}
+
+		// putting to cache a copy of allObjects because allObjects can be modified further
+		n.listsCache.Put(cacheKey, append([]*ObjectInfo(nil), allObjects...))
 	}
 
-	sortedNames := make([]string, 0, len(versions))
+	for i, obj := range allObjects {
-	for k := range versions {
+		if obj.Name >= p.KeyMarker && obj.Version() >= p.VersionIDMarker {
-		sortedNames = append(sortedNames, k)
+			allObjects = allObjects[i:]
-	}
-	sort.Strings(sortedNames)
-
-	objects := make([]*ObjectVersionInfo, 0, p.MaxKeys)
-	for _, name := range sortedNames {
-		objects = append(objects, versions[name].getFiltered()...)
-		if len(objects) > p.MaxKeys {
-			objects = objects[:p.MaxKeys]
 			break
 		}
 	}
 
+	res.CommonPrefixes, allObjects = triageObjects(allObjects)
+
+	if len(allObjects) > p.MaxKeys {
+		res.IsTruncated = true
+		res.NextKeyMarker = allObjects[p.MaxKeys].Name
+		res.NextVersionIDMarker = allObjects[p.MaxKeys].Version()
+
+		allObjects = allObjects[:p.MaxKeys]
+		res.KeyMarker = allObjects[p.MaxKeys-1].Name
+		res.VersionIDMarker = allObjects[p.MaxKeys-1].Version()
+	}
+
+	objects := make([]*ObjectVersionInfo, len(allObjects))
+	for i, obj := range allObjects {
+		objects[i] = &ObjectVersionInfo{Object: obj}
+		if i == len(allObjects)-1 || allObjects[i+1].Name != obj.Name {
+			objects[i].IsLatest = true
+		}
+	}
+
 	res.Version, res.DeleteMarker = triageVersions(objects)
-	return &res, nil
+	return res, nil
 }
 
 func sortVersions(versions []*ObjectInfo) {
@@ -773,7 +775,7 @@ func (n *layer) GetBucketVersioning(ctx context.Context, bucketName string) (*Bu
 	return n.getBucketSettings(ctx, bktInfo)
 }
 
-func (n *layer) getBucketSettings(ctx context.Context, bktInfo *BucketInfo) (*BucketSettings, error) {
+func (n *layer) getBucketSettings(ctx context.Context, bktInfo *cache.BucketInfo) (*BucketSettings, error) {
 	objInfo, err := n.getSettingsObjectInfo(ctx, bktInfo)
 	if err != nil {
 		return nil, err

api/layer/object.go

@@ -14,6 +14,8 @@ import (
 	cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/nspcc-dev/neofs-s3-gw/api/cache"
 	apiErrors "github.com/nspcc-dev/neofs-s3-gw/api/errors"
 	"go.uber.org/zap"
 )
@@ -29,9 +31,10 @@ type (
 		io.Writer
 		*object.Range
 
-		offset  int64
+		offset int64
-		length  int64
+		length int64
-		address *object.Address
+		cid    *cid.ID
+		oid    *object.ID
 	}
 
 	// ListObjectsParamsCommon contains common parameters for ListObjectsV1 and ListObjectsV2.
@@ -58,7 +61,7 @@ type (
 	}
 
 	allObjectParams struct {
-		Bucket    *BucketInfo
+		Bucket    *cache.BucketInfo
 		Delimiter string
 		Prefix    string
 	}
@@ -96,12 +99,16 @@ func (n *layer) objectFindID(ctx context.Context, p *findParams) (*object.ID, er
 	return nil, errors.New("several objects with the same name found")
 }
 
-// objectHead returns all object's headers.
+func newAddress(cid *cid.ID, oid *object.ID) *object.Address {
-func (n *layer) objectHead(ctx context.Context, cid *cid.ID, oid *object.ID) (*object.Object, error) {
 	address := object.NewAddress()
 	address.SetContainerID(cid)
 	address.SetObjectID(oid)
-	ops := new(client.ObjectHeaderParams).WithAddress(address).WithAllFields()
+	return address
+}
+
+// objectHead returns all object's headers.
+func (n *layer) objectHead(ctx context.Context, cid *cid.ID, oid *object.ID) (*object.Object, error) {
+	ops := new(client.ObjectHeaderParams).WithAddress(newAddress(cid, oid)).WithAllFields()
 	return n.pool.GetObjectHeader(ctx, ops, n.BearerOpt(ctx))
 }
 
@@ -109,19 +116,19 @@ func (n *layer) objectHead(ctx context.Context, cid *cid.ID, oid *object.ID) (*o
 func (n *layer) objectGet(ctx context.Context, p *getParams) (*object.Object, error) {
 	// prepare length/offset writer
 	w := newWriter(p.Writer, p.offset, p.length)
-	ops := new(client.GetObjectParams).WithAddress(p.address).WithPayloadWriter(w)
+	ops := new(client.GetObjectParams).WithAddress(newAddress(p.cid, p.oid)).WithPayloadWriter(w)
 	return n.pool.GetObject(ctx, ops, n.BearerOpt(ctx))
 }
 
 // objectRange gets object range and writes it into provided io.Writer.
 func (n *layer) objectRange(ctx context.Context, p *getParams) ([]byte, error) {
 	w := newWriter(p.Writer, p.offset, p.length)
-	ops := new(client.RangeDataParams).WithAddress(p.address).WithDataWriter(w).WithRange(p.Range)
+	ops := new(client.RangeDataParams).WithAddress(newAddress(p.cid, p.oid)).WithDataWriter(w).WithRange(p.Range)
 	return n.pool.ObjectPayloadRangeData(ctx, ops, n.BearerOpt(ctx))
 }
 
 // objectPut into NeoFS, took payload from io.Reader.
-func (n *layer) objectPut(ctx context.Context, bkt *BucketInfo, p *PutObjectParams) (*ObjectInfo, error) {
+func (n *layer) objectPut(ctx context.Context, bkt *cache.BucketInfo, p *PutObjectParams) (*ObjectInfo, error) {
 	own := n.Owner(ctx)
 	obj, err := url.QueryUnescape(p.Object)
 	if err != nil {
@@ -135,8 +142,15 @@ func (n *layer) objectPut(ctx context.Context, bkt *BucketInfo, p *PutObjectPara
 	}
 	idsToDeleteArr := updateCRDT2PSetHeaders(p, versions, versioningEnabled)
 
+	r := p.Reader
+	if len(p.Header[api.ContentType]) == 0 {
+		d := newDetector(p.Reader)
+		if contentType, err := d.Detect(); err == nil {
+			p.Header[api.ContentType] = contentType
+		}
+		r = d.MultiReader()
+	}
 	rawObject := formRawObject(p, bkt.CID, own, obj)
-	r := newDetector(p.Reader)
 
 	ops := new(client.PutObjectParams).WithObject(rawObject.Object()).WithPayloadReader(r)
 	oid, err := n.pool.PutObject(ctx, ops, n.BearerOpt(ctx))
@@ -144,11 +158,21 @@ func (n *layer) objectPut(ctx context.Context, bkt *BucketInfo, p *PutObjectPara
 		return nil, err
 	}
 
+	if p.Header[versionsDeleteMarkAttr] == delMarkFullObject {
+		if last := versions.getLast(); last != nil {
+			n.objCache.Delete(last.Address())
+		}
+	}
+
 	meta, err := n.objectHead(ctx, bkt.CID, oid)
 	if err != nil {
 		return nil, err
 	}
 
+	if err = n.objCache.Put(*meta); err != nil {
+		n.log.Error("couldn't cache an object", zap.Error(err))
+	}
+
 	for _, id := range idsToDeleteArr {
 		if err = n.objectDelete(ctx, bkt.CID, id); err != nil {
 			n.log.Warn("couldn't delete object",
@@ -168,7 +192,7 @@ func (n *layer) objectPut(ctx context.Context, bkt *BucketInfo, p *PutObjectPara
 		Created:       time.Now(),
 		CreationEpoch: meta.CreationEpoch(),
 		Headers:       p.Header,
-		ContentType:   r.contentType,
+		ContentType:   p.Header[api.ContentType],
 		HashSum:       meta.PayloadChecksum().String(),
 	}, nil
 }
@@ -229,9 +253,12 @@ func updateCRDT2PSetHeaders(p *PutObjectParams, versions *objectVersions, versio
 			versionsDeletedStr += ","
 		}
 
-		lastVersion := versions.getLast()
+		if lastVersion := versions.getLast(); lastVersion != nil {
-		p.Header[versionsDelAttr] = versionsDeletedStr + lastVersion.Version()
+			p.Header[versionsDelAttr] = versionsDeletedStr + lastVersion.Version()
-		idsToDeleteArr = append(idsToDeleteArr, lastVersion.ID())
+			idsToDeleteArr = append(idsToDeleteArr, lastVersion.ID())
+		} else if len(versionsDeletedStr) != 0 {
+			p.Header[versionsDelAttr] = versionsDeletedStr
+		}
 
 		for _, version := range versions.objects {
 			if contains(versions.delList, version.Version()) {
@@ -243,7 +270,13 @@ func updateCRDT2PSetHeaders(p *PutObjectParams, versions *objectVersions, versio
 	return idsToDeleteArr
 }
 
-func (n *layer) headLastVersionIfNotDeleted(ctx context.Context, bkt *BucketInfo, objectName string) (*ObjectInfo, error) {
+func (n *layer) headLastVersionIfNotDeleted(ctx context.Context, bkt *cache.BucketInfo, objectName string) (*ObjectInfo, error) {
+	if address := n.headCache.Get(bkt.Name + "/" + objectName); address != nil {
+		if headInfo := n.objCache.Get(address); headInfo != nil {
+			return objInfoFromMeta(bkt, headInfo), nil
+		}
+	}
+
 	versions, err := n.headVersions(ctx, bkt, objectName)
 	if err != nil {
 		return nil, err
@@ -253,10 +286,17 @@ func (n *layer) headLastVersionIfNotDeleted(ctx context.Context, bkt *BucketInfo
 	if lastVersion == nil {
 		return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchKey)
 	}
+
+	if err = n.headCache.Put(lastVersion.NiceName(), lastVersion.Address()); err != nil {
+		n.log.Warn("couldn't put obj address to head cache",
+			zap.String("obj nice name", lastVersion.NiceName()),
+			zap.Error(err))
+	}
+
 	return lastVersion, nil
 }
 
-func (n *layer) headVersions(ctx context.Context, bkt *BucketInfo, objectName string) (*objectVersions, error) {
+func (n *layer) headVersions(ctx context.Context, bkt *cache.BucketInfo, objectName string) (*objectVersions, error) {
 	ids, err := n.objectSearch(ctx, &findParams{cid: bkt.CID, val: objectName})
 	if err != nil {
 		return nil, err
@@ -276,6 +316,13 @@ func (n *layer) headVersions(ctx context.Context, bkt *BucketInfo, objectName st
 				zap.Error(err))
 			continue
 		}
+		if err = n.objCache.Put(*meta); err != nil {
+			n.log.Warn("couldn't put meta to objects cache",
+				zap.Stringer("object id", id),
+				zap.Stringer("bucket id", bkt.CID),
+				zap.Error(err))
+		}
+
 		if oi := objectInfoFromMeta(bkt, meta, "", ""); oi != nil {
 			if isSystem(oi) {
 				continue
@@ -287,12 +334,16 @@ func (n *layer) headVersions(ctx context.Context, bkt *BucketInfo, objectName st
 	return versions, nil
 }
 
-func (n *layer) headVersion(ctx context.Context, bkt *BucketInfo, versionID string) (*ObjectInfo, error) {
+func (n *layer) headVersion(ctx context.Context, bkt *cache.BucketInfo, versionID string) (*ObjectInfo, error) {
 	oid := object.NewID()
 	if err := oid.Parse(versionID); err != nil {
 		return nil, err
 	}
 
+	if headInfo := n.objCache.Get(newAddress(bkt.CID, oid)); headInfo != nil {
+		return objInfoFromMeta(bkt, headInfo), nil
+	}
+
 	meta, err := n.objectHead(ctx, bkt.CID, oid)
 	if err != nil {
 		if strings.Contains(err.Error(), "not found") {
@@ -301,14 +352,22 @@ func (n *layer) headVersion(ctx context.Context, bkt *BucketInfo, versionID stri
 		return nil, err
 	}
 
-	return objectInfoFromMeta(bkt, meta, "", ""), nil
+	objInfo := objectInfoFromMeta(bkt, meta, "", "")
+	if err = n.objCache.Put(*meta); err != nil {
+		n.log.Warn("couldn't put obj to object cache",
+			zap.String("bucket name", objInfo.Bucket),
+			zap.Stringer("bucket cid", objInfo.CID()),
+			zap.String("object name", objInfo.Name),
+			zap.Stringer("object id", objInfo.ID()),
+			zap.Error(err))
+	}
+
+	return objInfo, nil
 }
 
 // objectDelete puts tombstone object into neofs.
 func (n *layer) objectDelete(ctx context.Context, cid *cid.ID, oid *object.ID) error {
-	address := object.NewAddress()
+	address := newAddress(cid, oid)
-	address.SetContainerID(cid)
-	address.SetObjectID(oid)
 	dop := new(client.DeleteObjectParams)
 	dop.WithAddress(address)
 	n.objCache.Delete(address)
@@ -390,35 +449,11 @@ func (n *layer) ListObjectsV2(ctx context.Context, p *ListObjectsParamsV2) (*Lis
 }
 
 func (n *layer) listSortedObjectsFromNeoFS(ctx context.Context, p allObjectParams) ([]*ObjectInfo, error) {
-	ids, err := n.objectSearch(ctx, &findParams{cid: p.Bucket.CID})
+	versions, err := n.getAllObjectsVersions(ctx, p.Bucket, p.Prefix, p.Delimiter)
 	if err != nil {
 		return nil, err
 	}
 
-	versions := make(map[string]*objectVersions, len(ids)/2)
-
-	for _, id := range ids {
-		meta, err := n.objectHead(ctx, p.Bucket.CID, id)
-		if err != nil {
-			n.log.Warn("could not fetch object meta", zap.Error(err))
-			continue
-		}
-		if oi := objectInfoFromMeta(p.Bucket, meta, p.Prefix, p.Delimiter); oi != nil {
-			if isSystem(oi) {
-				continue
-			}
-
-			if objVersions, ok := versions[oi.Name]; ok {
-				objVersions.appendVersion(oi)
-				versions[oi.Name] = objVersions
-			} else {
-				objVersion := newObjectVersions(oi.Name)
-				objVersion.appendVersion(oi)
-				versions[oi.Name] = objVersion
-			}
-		}
-	}
-
 	objects := make([]*ObjectInfo, 0, len(versions))
 	for _, v := range versions {
 		lastVersion := v.getLast()
@@ -434,6 +469,38 @@ func (n *layer) listSortedObjectsFromNeoFS(ctx context.Context, p allObjectParam
 	return objects, nil
 }
 
+func (n *layer) getAllObjectsVersions(ctx context.Context, bkt *cache.BucketInfo, prefix, delimiter string) (map[string]*objectVersions, error) {
+	ids, err := n.objectSearch(ctx, &findParams{cid: bkt.CID})
+	if err != nil {
+		return nil, err
+	}
+
+	versions := make(map[string]*objectVersions, len(ids)/2)
+	for _, id := range ids {
+		meta, err := n.objectHead(ctx, bkt.CID, id)
+		if err != nil {
+			n.log.Warn("could not fetch object meta", zap.Error(err))
+			continue
+		}
+		if oi := objectInfoFromMeta(bkt, meta, prefix, delimiter); oi != nil {
+			if isSystem(oi) {
+				continue
+			}
+
+			if objVersions, ok := versions[oi.Name]; ok {
+				objVersions.appendVersion(oi)
+				versions[oi.Name] = objVersions
+			} else {
+				objVersion := newObjectVersions(oi.Name)
+				objVersion.appendVersion(oi)
+				versions[oi.Name] = objVersion
+			}
+		}
+	}
+
+	return versions, nil
+}
+
 func getExistedVersions(versions *objectVersions) []string {
 	var res []string
 	for _, add := range versions.addList {
@@ -498,7 +565,7 @@ func triageObjects(allObjects []*ObjectInfo) (prefixes []string, objects []*Obje
 func (n *layer) listAllObjects(ctx context.Context, p ListObjectsParamsCommon) ([]*ObjectInfo, error) {
 	var (
 		err        error
-		bkt        *BucketInfo
+		bkt        *cache.BucketInfo
 		cacheKey   cacheOptions
 		allObjects []*ObjectInfo
 	)
@@ -507,11 +574,11 @@ func (n *layer) listAllObjects(ctx context.Context, p ListObjectsParamsCommon) (
 		return nil, err
 	}
 
-	if cacheKey, err = createKey(ctx, bkt.CID, p.Prefix, p.Delimiter); err != nil {
+	if cacheKey, err = createKey(ctx, bkt.CID, listObjectsMethod, p.Prefix, p.Delimiter); err != nil {
 		return nil, err
 	}
 
-	allObjects = n.listObjCache.Get(cacheKey)
+	allObjects = n.listsCache.Get(cacheKey)
 
 	if allObjects == nil {
 		allObjects, err = n.listSortedObjectsFromNeoFS(ctx, allObjectParams{
@@ -524,13 +591,13 @@ func (n *layer) listAllObjects(ctx context.Context, p ListObjectsParamsCommon) (
 		}
 
 		// putting to cache a copy of allObjects because allObjects can be modified further
-		n.listObjCache.Put(cacheKey, append([]*ObjectInfo(nil), allObjects...))
+		n.listsCache.Put(cacheKey, append([]*ObjectInfo(nil), allObjects...))
 	}
 
 	return allObjects, nil
 }
 
-func (n *layer) isVersioningEnabled(ctx context.Context, bktInfo *BucketInfo) bool {
+func (n *layer) isVersioningEnabled(ctx context.Context, bktInfo *cache.BucketInfo) bool {
 	settings, err := n.getBucketSettings(ctx, bktInfo)
 	if err != nil {
 		n.log.Warn("couldn't get versioning settings object", zap.Error(err))

api/layer/object_list_cache.go

@@ -30,6 +30,11 @@ type (
 // DefaultObjectsListCacheLifetime is a default lifetime of entries in cache of ListObjects.
 const DefaultObjectsListCacheLifetime = time.Second * 60
 
+const (
+	listObjectsMethod  = "listObjects"
+	listVersionsMethod = "listVersions"
+)
+
 type (
 	listObjectsCache struct {
 		cacheLifetime time.Duration
@@ -78,7 +83,7 @@ func (l *listObjectsCache) Put(key cacheOptions, objects []*ObjectInfo) {
 	})
 }
 
-func createKey(ctx context.Context, cid *cid.ID, prefix, delimiter string) (cacheOptions, error) {
+func createKey(ctx context.Context, cid *cid.ID, method, prefix, delimiter string) (cacheOptions, error) {
 	box, err := GetBoxData(ctx)
 	if err != nil {
 		return cacheOptions{}, err

api/layer/util.go

@@ -12,6 +12,7 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
 	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/nspcc-dev/neofs-s3-gw/api/cache"
 	"github.com/nspcc-dev/neofs-s3-gw/creds/accessbox"
 )
 
@@ -60,7 +61,7 @@ type (
 
 	// ListObjectVersionsInfo stores info and list of objects' versions.
 	ListObjectVersionsInfo struct {
-		CommonPrefixes      []*string
+		CommonPrefixes      []string
 		IsTruncated         bool
 		KeyMarker           string
 		NextKeyMarker       string
@@ -84,7 +85,11 @@ func userHeaders(attrs []*object.Attribute) map[string]string {
 	return result
 }
 
-func objectInfoFromMeta(bkt *BucketInfo, meta *object.Object, prefix, delimiter string) *ObjectInfo {
+func objInfoFromMeta(bkt *cache.BucketInfo, meta *object.Object) *ObjectInfo {
+	return objectInfoFromMeta(bkt, meta, "", "")
+}
+
+func objectInfoFromMeta(bkt *cache.BucketInfo, meta *object.Object, prefix, delimiter string) *ObjectInfo {
 	var (
 		isDir    bool
 		size     int64
@@ -164,6 +169,12 @@ func (o *ObjectInfo) ID() *object.ID { return o.id }
 // Version returns object version from ObjectInfo.
 func (o *ObjectInfo) Version() string { return o.id.String() }
 
+// NiceName returns object name for cache.
+func (o *ObjectInfo) NiceName() string { return o.Bucket + "/" + o.Name }
+
+// Address returns object address.
+func (o *ObjectInfo) Address() *object.Address { return newAddress(o.bucketID, o.id) }
+
 // CID returns bucket ID from ObjectInfo.
 func (o *ObjectInfo) CID() *cid.ID { return o.bucketID }
 

api/layer/util_test.go

@@ -9,6 +9,7 @@ import (
 	cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	"github.com/nspcc-dev/neofs-s3-gw/api/cache"
 	"github.com/stretchr/testify/require"
 )
 
@@ -19,7 +20,7 @@ var (
 	defaultTestContentType   = http.DetectContentType(defaultTestPayload)
 )
 
-func newTestObject(oid *object.ID, bkt *BucketInfo, name string) *object.Object {
+func newTestObject(oid *object.ID, bkt *cache.BucketInfo, name string) *object.Object {
 	filename := object.NewAttribute()
 	filename.SetKey(object.AttributeFileName)
 	filename.SetValue(name)
@@ -43,7 +44,7 @@ func newTestObject(oid *object.ID, bkt *BucketInfo, name string) *object.Object
 	return raw.Object()
 }
 
-func newTestInfo(oid *object.ID, bkt *BucketInfo, name string, isDir bool) *ObjectInfo {
+func newTestInfo(oid *object.ID, bkt *cache.BucketInfo, name string, isDir bool) *ObjectInfo {
 	info := &ObjectInfo{
 		id:          oid,
 		Name:        name,
@@ -71,7 +72,7 @@ func Test_objectInfoFromMeta(t *testing.T) {
 	oid := object.NewID()
 	containerID := cid.New()
 
-	bkt := &BucketInfo{
+	bkt := &cache.BucketInfo{
 		Name:    "test-container",
 		CID:     containerID,
 		Owner:   uid,

api/layer/versioning_test.go

@@ -20,6 +20,7 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/session"
 	"github.com/nspcc-dev/neofs-api-go/pkg/token"
 	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/nspcc-dev/neofs-s3-gw/api/cache"
 	"github.com/nspcc-dev/neofs-s3-gw/creds/accessbox"
 	"github.com/nspcc-dev/neofs-sdk-go/pkg/logger"
 	"github.com/nspcc-dev/neofs-sdk-go/pkg/pool"
@@ -61,10 +62,7 @@ func (t *testPool) PutObject(ctx context.Context, params *client.PutObjectParams
 		raw.SetPayload(all)
 	}
 
-	addr := object.NewAddress()
+	addr := newAddress(raw.ContainerID(), raw.ID())
-	addr.SetObjectID(raw.ID())
-	addr.SetContainerID(raw.ContainerID())
-
 	t.objects[addr.String()] = raw.Object()
 	return raw.ID(), nil
 }
@@ -329,8 +327,12 @@ func prepareContext(t *testing.T) *testContext {
 	require.NoError(t, err)
 
 	return &testContext{
-		ctx:      ctx,
+		ctx: ctx,
-		layer:    NewLayer(l, tp),
+		layer: NewLayer(l, tp, &CacheConfig{
+			Size:                cache.DefaultObjectsCacheSize,
+			Lifetime:            cache.DefaultObjectsCacheLifetime,
+			ListObjectsLifetime: DefaultObjectsListCacheLifetime},
+		),
 		bkt:      bktName,
 		bktID:    bktID,
 		obj:      "obj1",