[#655] storage: Drop `LazyHandler`

LazyHandler is implemented and used incorrectly.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/blobovniczatree/iterate.go

@@ -53,9 +53,7 @@ func (b *Blobovniczas) Iterate(ctx context.Context, prm common.IteratePrm) (comm
 					StorageID:  []byte(p),
 				})
 			}
-			return prm.LazyHandler(elem.Address(), func() ([]byte, error) {
-				return data, err
-			})
+			return nil
 		})
 		subPrm.DecodeAddresses()
 

pkg/local_object_storage/blobstor/common/iterate.go

@@ -15,7 +15,6 @@ type IterationHandler func(IterationElement) error
 // IteratePrm groups the parameters of Iterate operation.
 type IteratePrm struct {
 	Handler      IterationHandler
-	LazyHandler  func(oid.Address, func() ([]byte, error)) error
 	IgnoreErrors bool
 	ErrorHandler func(oid.Address, error) error
 }

pkg/local_object_storage/blobstor/fstree/fstree.go

@@ -188,31 +188,24 @@ func (t *FSTree) iterate(ctx context.Context, depth uint64, curPath []string, pr
 			continue
 		}
 
-		if prm.LazyHandler != nil {
-			err = prm.LazyHandler(addr, func() ([]byte, error) {
-				return data, err
-			})
-		} else {
-			if err == nil {
-				data, err = t.Decompress(data)
-			}
-			if err != nil {
-				if prm.IgnoreErrors {
-					if prm.ErrorHandler != nil {
-						return prm.ErrorHandler(addr, err)
-					}
-					continue
+		if err == nil {
+			data, err = t.Decompress(data)
+		}
+		if err != nil {
+			if prm.IgnoreErrors {
+				if prm.ErrorHandler != nil {
+					return prm.ErrorHandler(addr, err)
 				}
-				return err
+				continue
 			}
-
-			err = prm.Handler(common.IterationElement{
-				Address:    addr,
-				ObjectData: data,
-				StorageID:  []byte{},
-			})
+			return err
 		}
 
+		err = prm.Handler(common.IterationElement{
+			Address:    addr,
+			ObjectData: data,
+			StorageID:  []byte{},
+		})
 		if err != nil {
 			return err
 		}

pkg/local_object_storage/blobstor/internal/blobstortest/iterate.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
-	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/stretchr/testify/require"
 )
 
@@ -30,8 +29,6 @@ func TestIterate(t *testing.T, cons Constructor, min, max uint64) {
 
 	runTestNormalHandler(t, s, objects)
 
-	runTestLazyHandler(t, s, objects)
-
 	runTestIgnoreLogicalErrors(t, s, objects)
 }
 
@@ -62,30 +59,6 @@ func runTestNormalHandler(t *testing.T, s common.Storage, objects []objectDesc)
 	})
 }
 
-func runTestLazyHandler(t *testing.T, s common.Storage, objects []objectDesc) {
-	t.Run("lazy handler", func(t *testing.T) {
-		seen := make(map[string]func() ([]byte, error))
-
-		var iterPrm common.IteratePrm
-		iterPrm.LazyHandler = func(addr oid.Address, f func() ([]byte, error)) error {
-			seen[addr.String()] = f
-			return nil
-		}
-
-		_, err := s.Iterate(context.Background(), iterPrm)
-		require.NoError(t, err)
-		require.Equal(t, len(objects), len(seen))
-		for i := range objects {
-			f, ok := seen[objects[i].addr.String()]
-			require.True(t, ok)
-
-			data, err := f()
-			require.NoError(t, err)
-			require.Equal(t, objects[i].raw, data)
-		}
-	})
-}
-
 func runTestIgnoreLogicalErrors(t *testing.T, s common.Storage, objects []objectDesc) {
 	t.Run("ignore errors doesn't work for logical errors", func(t *testing.T) {
 		seen := make(map[string]objectDesc)

pkg/local_object_storage/blobstor/memstore/memstore.go

@@ -154,10 +154,6 @@ func (s *memstoreImpl) Iterate(_ context.Context, req common.IteratePrm) (common
 			if err := req.Handler(elem); err != nil {
 				return common.IterateRes{}, err
 			}
-		case req.LazyHandler != nil:
-			if err := req.LazyHandler(elem.Address, func() ([]byte, error) { return elem.ObjectData, nil }); err != nil {
-				return common.IterateRes{}, err
-			}
 		default:
 			if !req.IgnoreErrors {
 				return common.IterateRes{}, logicerr.Wrap(fmt.Errorf("(%T) no Handler or LazyHandler set for IteratePrm", s))

pkg/local_object_storage/writecache/writecachebbolt/flush.go

@@ -180,20 +180,11 @@ func (c *cache) reportFlushError(msg string, addr string, err error) {
 func (c *cache) flushFSTree(ctx context.Context, ignoreErrors bool) error {
 	var prm common.IteratePrm
 	prm.IgnoreErrors = ignoreErrors
-	prm.LazyHandler = func(addr oid.Address, f func() ([]byte, error)) error {
-		sAddr := addr.EncodeToString()
-
-		data, err := f()
-		if err != nil {
-			c.reportFlushError(logs.FSTreeCantReadFile, sAddr, metaerr.Wrap(err))
-			if ignoreErrors {
-				return nil
-			}
-			return err
-		}
+	prm.Handler = func(e common.IterationElement) error {
+		sAddr := e.Address.EncodeToString()
 
 		var obj objectSDK.Object
-		err = obj.Unmarshal(data)
+		err := obj.Unmarshal(e.ObjectData)
 		if err != nil {
 			c.reportFlushError(logs.FSTreeCantUnmarshalObject, sAddr, metaerr.Wrap(err))
 			if ignoreErrors {
@@ -202,7 +193,7 @@ func (c *cache) flushFSTree(ctx context.Context, ignoreErrors bool) error {
 			return err
 		}
 
-		err = c.flushObject(ctx, &obj, data, writecache.StorageTypeFSTree)
+		err = c.flushObject(ctx, &obj, e.ObjectData, writecache.StorageTypeFSTree)
 		if err != nil {
 			if ignoreErrors {
 				return nil