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Problem: there's no compact historical state storage
Closes: crypto-org-chain#704 Solution: - Integration version store and streaming service.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package versiondb | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "sort" | ||
|
|
||
| "github.com/RoaringBitmap/roaring/roaring64" | ||
| ) | ||
|
|
||
| var ChunkLimit = uint64(1950) // threshold beyond which MDBX overflow pages appear: 4096 / 2 - (keySize + 8) | ||
|
|
||
| // CutLeft - cut from bitmap `targetSize` bytes from left | ||
| // removing lft part from `bm` | ||
| // returns nil on zero cardinality | ||
| func CutLeft64(bm *roaring64.Bitmap, sizeLimit uint64) *roaring64.Bitmap { | ||
| if bm.GetCardinality() == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| sz := bm.GetSerializedSizeInBytes() | ||
| if sz <= sizeLimit { | ||
| lft := roaring64.New() | ||
| lft.AddRange(bm.Minimum(), bm.Maximum()+1) | ||
| lft.And(bm) | ||
| lft.RunOptimize() | ||
| bm.Clear() | ||
| return lft | ||
| } | ||
|
|
||
| from := bm.Minimum() | ||
| minMax := bm.Maximum() - bm.Minimum() | ||
| to := sort.Search(int(minMax), func(i int) bool { // can be optimized to avoid "too small steps", but let's leave it for readability | ||
| lft := roaring64.New() // bitmap.Clear() method intentionally not used here, because then serialized size of bitmap getting bigger | ||
| lft.AddRange(from, from+uint64(i)+1) | ||
| lft.And(bm) | ||
| lft.RunOptimize() | ||
| return lft.GetSerializedSizeInBytes() > sizeLimit | ||
| }) | ||
|
|
||
| lft := roaring64.New() | ||
| lft.AddRange(from, from+uint64(to)) // no +1 because sort.Search returns element which is just higher threshold - but we need lower | ||
| lft.And(bm) | ||
| bm.RemoveRange(from, from+uint64(to)) | ||
| lft.RunOptimize() | ||
| return lft | ||
| } | ||
|
|
||
| func WalkChunks64(bm *roaring64.Bitmap, sizeLimit uint64, f func(chunk *roaring64.Bitmap, isLast bool) error) error { | ||
| for bm.GetCardinality() > 0 { | ||
| if err := f(CutLeft64(bm, sizeLimit), bm.GetCardinality() == 0); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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||
| func WalkChunkWithKeys64(k []byte, m *roaring64.Bitmap, sizeLimit uint64, f func(chunkKey []byte, chunk *roaring64.Bitmap) error) error { | ||
| return WalkChunks64(m, sizeLimit, func(chunk *roaring64.Bitmap, isLast bool) error { | ||
| chunkKey := make([]byte, len(k)+8) | ||
| copy(chunkKey, k) | ||
| if isLast { | ||
| binary.BigEndian.PutUint64(chunkKey[len(k):], ^uint64(0)) | ||
| } else { | ||
| binary.BigEndian.PutUint64(chunkKey[len(k):], chunk.Maximum()) | ||
| } | ||
| return f(chunkKey, chunk) | ||
| }) | ||
| } | ||
|
|
||
| // SeekInBitmap64 - returns value in bitmap which is >= n | ||
| func SeekInBitmap64(m *roaring64.Bitmap, n uint64) (found uint64, ok bool) { | ||
| if m == nil || m.IsEmpty() { | ||
| return 0, false | ||
| } | ||
| if n == 0 { | ||
| return m.Minimum(), true | ||
| } | ||
| searchRank := m.Rank(n - 1) | ||
| if searchRank >= m.GetCardinality() { | ||
| return 0, false | ||
| } | ||
| found, _ = m.Select(searchRank) | ||
| return found, true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package versiondb | ||
|
|
||
| import ( | ||
| "bytes" | ||
|
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| "github.com/RoaringBitmap/roaring/roaring64" | ||
|
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| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| dbm "github.com/tendermint/tm-db" | ||
| ) | ||
|
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| const LastChunkId = ^uint64(0) | ||
|
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| func HistoryIndexKey(key []byte, height uint64) []byte { | ||
| return append(key, sdk.Uint64ToBigEndian(height)...) | ||
| } | ||
|
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| // GetHistoryIndex returns the history index bitmap chunk which covers the target version. | ||
| func GetHistoryIndex(db dbm.DB, key []byte, height uint64) (*roaring64.Bitmap, error) { | ||
| // try to seek the first chunk whose maximum is bigger or equal to the target height. | ||
| it, err := db.Iterator( | ||
| HistoryIndexKey(key, height), | ||
| sdk.PrefixEndBytes(key), | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer it.Close() // nolint: errcheck | ||
|
|
||
| if !it.Valid() { | ||
| return nil, nil | ||
| } | ||
|
|
||
| m := roaring64.New() | ||
| _, err = m.ReadFrom(bytes.NewReader(it.Value())) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return m, nil | ||
| } | ||
|
|
||
| // SeekHistoryIndex locate the minimal version that changed the key and is larger than the target version, | ||
| // using the returned version can find the value for the target version in changeset table. | ||
| // If not found, return -1 | ||
| func SeekHistoryIndex(db dbm.DB, key []byte, version uint64) (int64, error) { | ||
| // either m.Maximum() >= version + 1, or is the last chunk. | ||
| m, err := GetHistoryIndex(db, key, version+1) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
| found, ok := SeekInBitmap64(m, version+1) | ||
| if !ok { | ||
| return -1, nil | ||
| } | ||
| return int64(found), nil | ||
| } | ||
|
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| // WriteHistoryIndex set the block height to the history bitmap. | ||
| // it try to set to the last chunk, if the last chunk exceeds chunk limit, split it. | ||
| func WriteHistoryIndex(db dbm.DB, batch dbm.Batch, key []byte, height uint64) error { | ||
| lastKey := HistoryIndexKey(key, LastChunkId) | ||
| bz, err := db.Get(lastKey) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| m := roaring64.New() | ||
| if len(bz) > 0 { | ||
| _, err = m.ReadFrom(bytes.NewReader(bz)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| m.Add(height) | ||
|
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| // chunking | ||
| if err = WalkChunks64(m, ChunkLimit, func(chunk *roaring64.Bitmap, isLast bool) error { | ||
| chunkKey := lastKey | ||
| if !isLast { | ||
| chunkKey = HistoryIndexKey(key, chunk.Maximum()) | ||
| } | ||
| bz, err := chunk.ToBytes() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return batch.Set(chunkKey, bz) | ||
| }); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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