kubernetes/vendor/go.etcd.io/etcd/server/v3/wal/util.go

var errBadWALName …

// Exist returns true if there are any files in a given directory.
func Exist(dir string) bool { … }

// searchIndex returns the last array index of names whose raft index section is
// equal to or smaller than the given index.
// The given names MUST be sorted.
func searchIndex(lg *zap.Logger, names []string, index uint64) (int, bool) { … }

// names should have been sorted based on sequence number.
// isValidSeq checks whether seq increases continuously.
func isValidSeq(lg *zap.Logger, names []string) bool { … }

func readWALNames(lg *zap.Logger, dirpath string) ([]string, error) { … }

func checkWalNames(lg *zap.Logger, names []string) []string { … }

func parseWALName(str string) (seq, index uint64, err error) { … }

func walName(seq, index uint64) string { … }