badger_db_mono_increasing_keys.go

// https://pkg.go.dev/github.com/dgraph-io/badger#section-readme
// db, err := badger.Open(badger.DefaultOptions("/tmp/badger"))
func storeLog(val byte[]) {
  seq, err := db.GetSequence("dummy-key", 1)
  defer seq.Release()
  var ids []uint64
  for len(ids) < 1 {
    num, err := seq.Next()
    if err != nil {
      break
    }
    ids = append(ids, num)
  }
  
  for _, id := range ids {
    idBytes := make([]byte, 8)
    // Use BigEndian instead of LittleEndian
    binary.BigEndian.PutUint64(idBytes, logId)
    // This key prefix should be consistent with the logic at line 33
    logKeyPrefix := getLogKeyPrefix()
    finalKey := append(logKeyPrefix, idBytes)
    // Set finalKey and val into badger DB
  }
}

func iterateLogs() {
  err := db.View(func(txn *badger.Txn) error {
    opts := badger.DefaultIteratorOptions
    opts.PrefetchSize = 10
    it := txn.NewIterator(opts)
    defer it.Close()
    // This key prefix should be consistnt with the logic at line 19
    logKeyPrefix := getLogKeyPrefix()
    for it.Seek([]byte(logKeyPrefix)); it.ValidForPrefix([]byte(logKeyPrefix)); it.Next() {
      item := it.Item()
      // This k is monotonically increasing integers
      k := item.Key()
      err := item.Value(func(v []byte) error {
        // Do some logic
	return nil
      })
      if err != nil {
        return err
      }
    }
    return nil
  })
  if err != nil {
    panic("panic")
  } 
}