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package files
import (
"context"
"encoding/json"
"time"
badger "github.com/dgraph-io/badger/v4"
"github.com/dgraph-io/badger/v4/options"
"golang.org/x/sync/errgroup"
)
func decodeDbInfo(item *badger.Item) (*FileInfo, error) {
var info FileInfo
if err := item.Value(func(val []byte) error {
if err := json.Unmarshal(val, &info); err != nil {
return err
}
return nil
}); err != nil {
return nil, err
}
return &info, nil
}
func getInfoFromDb(database *badger.DB, hashsum []byte) (*FileInfo, error) {
var info *FileInfo
if err := database.View(func(txn *badger.Txn) error {
item, err := txn.Get(hashsum)
if err != nil {
return err
}
info, err = decodeDbInfo(item)
if err != nil {
return err
}
return nil
}); err != nil {
return nil, err
}
return info, nil
}
func (filedata *FileInfo) evaluateFile(database *badger.DB, hashsum []byte, encoder string) error {
info, err := getInfoFromDb(database, hashsum)
if err != nil {
return err
}
if info.Process {
return ReencodeNeeded
}
if filedata.Encoder != encoder {
return ReencodeNeeded
}
if info.AbsPath != filedata.AbsPath {
return FileMoved
}
return ReencodeNotNeeded
}
func (filedata *FileInfo) updateFile(database *badger.DB, hashsum []byte) error {
return database.Update(func(txn *badger.Txn) error {
encoded, err := json.Marshal(filedata)
if err != nil {
return err
}
return txn.Set(hashsum, encoded)
})
}
func (filedata *FileInfo) IndexFile(ctx context.Context, hashsum []byte) error {
database := ctx.Value("database").(*badger.DB)
encoder := ctx.Value("encoder").(string)
err := filedata.evaluateFile(database, hashsum, encoder)
switch err {
case FileMoved, ReencodeNotNeeded:
filedata.Process = false
case ReencodeNeeded, badger.ErrKeyNotFound:
default:
return err
}
if err := filedata.updateFile(database, hashsum); err != nil {
return err
}
return nil
}
func ReencodeFlacs(ctx context.Context) error {
db := ctx.Value("database").(*badger.DB)
wg := new(errgroup.Group)
wg.SetLimit(4)
err := db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = 10
it := txn.NewIterator(opts)
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
/* item := it.Item()
key := item.Key()
info, err := decodeDbInfo(item)
if err != nil {
return err
}
if err := info.reencodeFile(ctx); err != nil {
return err
}
if err := info.updateFile(db, key); err != nil {
return err
} */
select {
case <-ctx.Done():
return nil
default:
item := it.Item()
key := item.Key()
info, err := decodeDbInfo(item)
if err != nil {
return err
}
wg.Go(func() error {
select {
case <-ctx.Done():
return nil
default:
if err := info.reencodeFile(ctx); err != nil {
return err
}
if err := info.updateFile(db, key); err != nil {
return err
}
return nil
}
})
}
}
return nil
})
wg.Wait()
return err
}
func Options(path string) badger.Options {
return badger.Options{
Dir: path,
ValueDir: path,
MemTableSize: 64 << 20,
BaseTableSize: 2 << 20,
BaseLevelSize: 10 << 20,
TableSizeMultiplier: 2,
LevelSizeMultiplier: 10,
MaxLevels: 7,
NumGoroutines: 8,
MetricsEnabled: true,
NumCompactors: 4, // Run at least 2 compactors. Zero-th compactor prioritizes L0.
NumLevelZeroTables: 5,
NumLevelZeroTablesStall: 15,
NumMemtables: 5,
BloomFalsePositive: 0.01,
BlockSize: 4 * 1024,
SyncWrites: false,
NumVersionsToKeep: 1,
CompactL0OnClose: false,
VerifyValueChecksum: false,
Compression: options.Snappy,
BlockCacheSize: 256 << 20,
IndexCacheSize: 0,
// The following benchmarks were done on a 4 KB block size (default block size). The
// compression is ratio supposed to increase with increasing compression level but since the
// input for compression algorithm is small (4 KB), we don't get significant benefit at
// level 3.
// NOTE: The benchmarks are with DataDog ZSTD that requires CGO. Hence, no longer valid.
// no_compression-16 10 502848865 ns/op 165.46 MB/s -
// zstd_compression/level_1-16 7 739037966 ns/op 112.58 MB/s 2.93
// zstd_compression/level_3-16 7 756950250 ns/op 109.91 MB/s 2.72
// zstd_compression/level_15-16 1 11135686219 ns/op 7.47 MB/s 4.38
// Benchmark code can be found in table/builder_test.go file
ZSTDCompressionLevel: 1,
// (2^30 - 1)*2 when mmapping < 2^31 - 1, max int32.
// -1 so 2*ValueLogFileSize won't overflow on 32-bit systems.
ValueLogFileSize: 1<<30 - 1,
ValueLogMaxEntries: 1000000,
VLogPercentile: 0.0,
ValueThreshold: (1 << 20),
Logger: nil,
EncryptionKey: []byte{},
EncryptionKeyRotationDuration: 10 * 24 * time.Hour, // Default 10 days.
DetectConflicts: true,
NamespaceOffset: -1,
}
}
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