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package raft
import (
// uint64Slice implements sort interface
type uint64Slice []uint64
func (p uint64Slice) Len() int { return len(p) }
func (p uint64Slice) Less(i, j int) bool { return p[i] < p[j] }
func (p uint64Slice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
// WriteFile writes data to a file named by filename.
// If the file does not exist, WriteFile creates it with permissions perm;
// otherwise WriteFile truncates it before writing.
// This is copied from ioutil.WriteFile with the addition of a Sync call to
// ensure the data reaches the disk.
func writeFileSynced(filename string, data []byte, perm os.FileMode) error {
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
if err != nil {
return err
n, err := f.Write(data)
if n < len(data) {
return io.ErrShortWrite
err = f.Sync()
if err != nil {
return err
return f.Close()
// Waits for a random time between two durations and sends the current time on
// the returned channel.
func afterBetween(min time.Duration, max time.Duration) <-chan time.Time {
rand := rand.New(rand.NewSource(time.Now().UnixNano()))
d, delta := min, (max - min)
if delta > 0 {
d += time.Duration(rand.Int63n(int64(delta)))
return time.After(d)
// TODO(xiangli): Remove assertions when we reach version 1.0
// _assert will panic with a given formatted message if the given condition is false.
func _assert(condition bool, msg string, v ...interface{}) {
if !condition {
panic(fmt.Sprintf("assertion failed: "+msg, v...))
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