Method loadRecords

internal/users/index.go:95–136

loadRecords bulk-reads all records from disk into memory and builds lookup maps.

()

// loadRecords bulk-reads all records from disk into memory and builds lookup maps.
func (idx *UserIndex) loadRecords() {
	idx.byUsername = make(map[string]int64, idx.metaData.RecordCount)
	idx.byUserId = make(map[int64]string, idx.metaData.RecordCount)
	idx.highestUserId = 0

	if idx.metaData.RecordCount == 0 {
		idx.records = nil
		return
	}

	f, err := os.Open(idx.Filename)
	if err != nil {
		return
	}
	defer f.Close()

	dataSize := idx.metaData.RecordCount * idx.metaData.RecordSize
	buf := make([]byte, dataSize)
	if _, err := f.Seek(int64(idx.metaData.MetaDataSize), io.SeekStart); err != nil {
		return
	}
	if _, err := io.ReadFull(f, buf); err != nil {
		return
	}

	idx.records = make([]IndexUserRecord, idx.metaData.RecordCount)

	for i := uint64(0); i < idx.metaData.RecordCount; i++ {
		offset := i * idx.metaData.RecordSize
		rec := &idx.records[i]
		copy(rec.Username[:], buf[offset:offset+80])
		rec.UserID = int64(binary.LittleEndian.Uint64(buf[offset+80 : offset+88]))

		username := string(bytes.TrimRight(rec.Username[:], "\x00"))
		idx.byUsername[username] = rec.UserID
		idx.byUserId[rec.UserID] = username

		if int(rec.UserID) > idx.highestUserId {
			idx.highestUserId = int(rec.UserID)
		}
	}
}

// Create initializes a new empty index file with a header.
func (idx *UserIndex) Create() error {