[#165] Add batching in streamin listing

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

api/cache/listsession.go

@@ -55,7 +55,7 @@ func NewListSessionCache(config *Config) *ListSessionCache {
 				zap.String("expected", fmt.Sprintf("%T", session)))
 		}
 
-		session.Cancel()
+		//session.Cancel()
 	}).Build()
 	return &ListSessionCache{cache: gc, logger: config.Logger}
 }

api/layer/object.go

@@ -13,6 +13,7 @@ import (
 	"io"
 	"mime"
 	"path/filepath"
+	"runtime"
 	"sort"
 	"strconv"
 	"strings"
@@ -596,6 +597,20 @@ func (l *logWrapper) Printf(format string, args ...interface{}) {
 	l.log.Info(fmt.Sprintf(format, args...))
 }
 
+func PrintMemUsage() {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	// For info on each, see: https://golang.org/pkg/runtime/#MemStats
+	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))
+	fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
+	fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
+	fmt.Printf("\tNumGC = %v\n", m.NumGC)
+}
+
+func bToMb(b uint64) uint64 {
+	return b / 1024 / 1024
+}
+
 func (n *layer) getLatestObjectsVersions(ctx context.Context, p allObjectParams) (objects []*data.ObjectInfo, next *data.ObjectInfo, err error) {
 	if p.MaxKeys == 0 {
 		return nil, nil, nil
@@ -634,6 +649,20 @@ func (n *layer) getLatestObjectsVersions(ctx context.Context, p allObjectParams)
 		objects = append(objects, obj)
 	}
 
+	//for node := range nodesGenerator(poolCtx, p, nodeVersions) {
+	//	objects = append(objects, &data.ObjectInfo{
+	//		ID:             node.OID,
+	//		IsDir:          false,
+	//		IsDeleteMarker: node.IsDeleteMarker(),
+	//		Name:           node.FilePath,
+	//		Size:           node.Size,
+	//		Created:        time.Time{},
+	//		HashSum:        node.ETag,
+	//		Owner:          user.ID{},
+	//		Headers:        nil,
+	//	})
+	//}
+
 	sort.Slice(objects, func(i, j int) bool {
 		return objects[i].Name < objects[j].Name
 	})
@@ -652,7 +681,7 @@ func (n *layer) getLatestObjectsVersionsV2(ctx context.Context, p allObjectParam
 	}
 
 	owner := n.BearerOwner(ctx)
-	cacheKey := cache.CreateListSessionCacheKey(p.Bucket.CID, p.Prefix, p.Delimiter)
+	cacheKey := cache.CreateListSessionCacheKey(p.Bucket.CID, p.Prefix, p.ContinuationToken)
 	session := n.cache.GetListSession(owner, cacheKey)
 	if session != nil {
 		// after reading next object from stream in session
@@ -690,6 +719,20 @@ func (n *layer) getLatestObjectsVersionsV2(ctx context.Context, p allObjectParam
 		objects = append(objects, obj)
 	}
 
+	//for node := range generator {
+	//	objects = append(objects, &data.ObjectInfo{
+	//		ID:             node.OID,
+	//		IsDir:          false,
+	//		IsDeleteMarker: node.IsDeleteMarker(),
+	//		Name:           node.FilePath,
+	//		Size:           node.Size,
+	//		Created:        time.Time{},
+	//		HashSum:        node.ETag,
+	//		Owner:          user.ID{},
+	//		Headers:        nil,
+	//	})
+	//}
+
 	if err = <-errorCh; err != nil {
 		return nil, nil, fmt.Errorf("failed to get next object from stream: %w", err)
 	}
@@ -768,7 +811,7 @@ func nodesGeneratorVersions(ctx context.Context, p allObjectParams, nodeVersions
 }
 
 func nodesGeneratorStream(ctx context.Context, p allObjectParams, stream *data.ListSession) (<-chan *data.NodeVersion, <-chan error) {
-	nodeCh := make(chan *data.NodeVersion)
+	nodeCh := make(chan *data.NodeVersion, 1000)
 	errCh := make(chan error, 1)
 	//existed := make(map[string]struct{}, p.MaxKeys) // to squash the same directories
 	existed := stream.NamesMap

internal/frostfs/services/pool_wrapper.go

@@ -126,18 +126,42 @@ func (w *PoolWrapper) GetSubTree(ctx context.Context, bktInfo *data.BucketInfo,
 
 type SubTreeStreamImpl struct {
 	r      *treepool.SubTreeReader
+	buffer []*grpcService.GetSubTreeResponse_Body
+	eof    bool
+	index  int
+	ln     int
 }
 
+const bufSize = 1000
+
 func (s *SubTreeStreamImpl) Next() (tree.NodeResponse, error) {
-	node, err := s.r.Next()
+	if s.index != -1 {
+		node := s.buffer[s.index]
+		s.index++
+		if s.index >= s.ln {
+			s.index = -1
+		}
+		return GetSubTreeResponseBodyWrapper{response: node}, nil
+	}
+	if s.eof {
+		return nil, io.EOF
+	}
+
+	var err error
+	s.ln, err = s.r.Read(s.buffer)
 	if err != nil {
 		if err != io.EOF {
 			err = handleError(err)
-		}
 			return nil, fmt.Errorf("sub tree stream impl pool wrap: %w", err)
+		} else {
+			s.eof = true
+		}
+	}
+	if s.ln > 0 {
+		s.index = 0
 	}
 
-	return GetSubTreeResponseBodyWrapper{node}, nil
+	return s.Next()
 }
 
 func (w *PoolWrapper) GetSubTreeStream(ctx context.Context, bktInfo *data.BucketInfo, treeID string, rootID uint64, depth uint32) (tree.SubTreeStream, error) {
@@ -154,7 +178,11 @@ func (w *PoolWrapper) GetSubTreeStream(ctx context.Context, bktInfo *data.Bucket
 		return nil, handleError(err)
 	}
 
-	return &SubTreeStreamImpl{r: subTreeReader}, nil
+	return &SubTreeStreamImpl{
+		r:      subTreeReader,
+		buffer: make([]*grpcService.GetSubTreeResponse_Body, bufSize),
+		index:  -1,
+	}, nil
 }
 
 func (w *PoolWrapper) AddNode(ctx context.Context, bktInfo *data.BucketInfo, treeID string, parent uint64, meta map[string]string) (uint64, error) {

pkg/service/tree/tree.go

@@ -708,6 +708,7 @@ func (s *LatestVersionsByPrefixStreamImpl) Next(ctx context.Context) (*data.Node
 	if err != nil {
 		if errors.Is(err, io.EOF) {
 			s.innerStream = nil
+			s.namesMap = map[uint64]string{}
 			return s.Next(ctx)
 		}
 		return nil, fmt.Errorf("inner stream: %w", err)