Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Omit empty next slab ID in encoded map data slab #340

Merged
merged 1 commit into from
Sep 12, 2023
Merged

Omit empty next slab ID in encoded map data slab #340

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 14 additions & 8 deletions map.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2200,20 +2200,21 @@ func newMapDataSlabFromDataV1(
var extraData *MapExtraData
var next SlabID

// Decode header
// Decode extra data
if h.isRoot() {
// Decode extra data
extraData, data, err = newMapExtraDataFromData(data, decMode, decodeTypeInfo)
if err != nil {
// Don't need to wrap error as external error because err is already categorized by newMapExtraDataFromData().
return nil, err
}
} else {
}

// Decode next slab ID
if h.hasNextSlabID() {
if len(data) < slabIDSize {
return nil, NewDecodingErrorf("data is too short for map data slab")
}

// Decode next slab ID
next, err = NewSlabIDFromRawBytes(data)
if err != nil {
// Don't need to wrap error as external error because err is already categorized by NewSlabIDFromRawBytes().
Expand Down Expand Up @@ -2291,6 +2292,10 @@ func (m *MapDataSlab) Encode(enc *Encoder) error {
h.setHasPointers()
}

if m.next != SlabIDUndefined {
h.setHasNextSlabID()
}

if m.anySize {
h.setNoSizeLimit()
}
Expand All @@ -2305,16 +2310,17 @@ func (m *MapDataSlab) Encode(enc *Encoder) error {
return NewEncodingError(err)
}

// Encode header
// Encode extra data
if m.extraData != nil {
// Encode extra data
err = m.extraData.Encode(enc)
if err != nil {
// Don't need to wrap error as external error because err is already categorized by MapExtraData.Encode().
return err
}
} else {
// Encode next slab ID to scratch
}

// Encode next slab ID
if m.next != SlabIDUndefined {
n, err := m.next.ToRawBytes(enc.Scratch[:])
if err != nil {
// Don't need to wrap error as external error because err is already categorized by SlabID.ToRawBytes().
Expand Down
29 changes: 5 additions & 24 deletions map_debug.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -849,18 +849,16 @@ func validMapSlabSerialization(
}

// Extra check: encoded data size == header.size
encodedExtraDataSize, err := getEncodedMapExtraDataSize(slab.ExtraData(), cborEncMode)
encodedSlabSize, err := computeSlabSize(data)
if err != nil {
// Don't need to wrap error as external error because err is already categorized by getEncodedMapExtraDataSize().
// Don't need to wrap error as external error because err is already categorized by computeSlabSize().
return err
}

// Need to exclude extra data size from encoded data size.
encodedSlabSize := uint32(len(data) - encodedExtraDataSize)
if slab.Header().size != encodedSlabSize {
if slab.Header().size != uint32(encodedSlabSize) {
return NewFatalError(
fmt.Errorf("slab %d encoded size %d != header.size %d (encoded extra data size %d)",
id, encodedSlabSize, slab.Header().size, encodedExtraDataSize))
fmt.Errorf("slab %d encoded size %d != header.size %d",
id, encodedSlabSize, slab.Header().size))
}

// Compare encoded data of original slab with encoded data of decoded slab
Expand Down Expand Up @@ -1357,20 +1355,3 @@ func mapExtraDataEqual(expected, actual *MapExtraData) error {

return nil
}

func getEncodedMapExtraDataSize(extraData *MapExtraData, cborEncMode cbor.EncMode) (int, error) {
if extraData == nil {
return 0, nil
}

var buf bytes.Buffer
enc := NewEncoder(&buf, cborEncMode)

err := extraData.Encode(enc)
if err != nil {
// Don't need to wrap error as external error because err is already categorized by MapExtraData.Encode().
return 0, err
}

return len(buf.Bytes()), nil
}
11 changes: 3 additions & 8 deletions map_test.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2737,7 +2737,7 @@ func TestMapEncodeDecode(t *testing.T) {
// data slab
id2: {
// version
0x10,
0x12,
// flag: map data
0x08,
// next slab id
Expand Down Expand Up @@ -2789,8 +2789,6 @@ func TestMapEncodeDecode(t *testing.T) {
0x10,
// flag: has pointer + map data
0x48,
// next slab id
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

// the following encoded data is valid CBOR

Expand Down Expand Up @@ -2864,7 +2862,8 @@ func TestMapEncodeDecode(t *testing.T) {
require.True(t, ok)
require.Equal(t, 2, len(meta.childrenHeaders))
require.Equal(t, uint32(len(stored[id2])), meta.childrenHeaders[0].size)
require.Equal(t, uint32(len(stored[id3])), meta.childrenHeaders[1].size)
// Need to add slabIDSize to encoded data slab here because empty slab ID is omitted during encoding.
require.Equal(t, uint32(len(stored[id3])+slabIDSize), meta.childrenHeaders[1].size)

// Decode data to new storage
storage2 := newTestPersistentStorageWithData(t, stored)
Expand Down Expand Up @@ -3392,8 +3391,6 @@ func TestMapEncodeDecode(t *testing.T) {
0x10,
// flag: any size + collision group
0x2b,
// next slab id
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

// the following encoded data is valid CBOR

Expand Down Expand Up @@ -3457,8 +3454,6 @@ func TestMapEncodeDecode(t *testing.T) {
0x10,
// flag: any size + collision group
0x2b,
// next slab id
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

// the following encoded data is valid CBOR

Expand Down