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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,62 +1,134 @@ | ||
| package ntp | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "math" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/beevik/ntp" | ||
| "github.com/pactus-project/pactus/util/logger" | ||
| ) | ||
|
|
||
| const ( | ||
| maxClockOffset = time.Duration(math.MinInt64) | ||
| ) | ||
|
|
||
| type Checker struct { | ||
| lock sync.RWMutex | ||
| ctx context.Context | ||
| cancel func() | ||
|
|
||
| threshold time.Duration | ||
| offset time.Duration | ||
| interval time.Duration | ||
| logger *logger.SubLogger | ||
| retryTimes int | ||
| } | ||
|
|
||
| func NewNtpChecker(interval time.Duration) *Checker { | ||
| ctxWithCancel, cancel := context.WithCancel(context.Background()) | ||
| server := &Checker{ | ||
| ctx: ctxWithCancel, | ||
| cancel: cancel, | ||
| interval: interval, | ||
| threshold: 1 * time.Second, | ||
| retryTimes: 3, | ||
| } | ||
|
|
||
| server.logger = logger.NewSubLogger("_ntp", server) | ||
|
|
||
| return server | ||
| } | ||
|
|
||
| func (c *Checker) clockOffset() time.Duration { | ||
| clockOffset := maxClockOffset | ||
|
|
||
| for i := 0; i < c.retryTimes; i++ { | ||
| server := "pool.ntp.org" | ||
| response, err := ntp.Query(server) | ||
| if err != nil { | ||
| c.logger.Debug( | ||
| fmt.Sprintf("ntp error(retry %v/%v times)", i+1, c.retryTimes), | ||
| "server", server, "error", err, | ||
| ) | ||
|
|
||
| continue | ||
| } | ||
|
|
||
| if err := response.Validate(); err != nil { | ||
| c.logger.Debug( | ||
| fmt.Sprintf("ntp error(retry %v/%v times)", i+1, c.retryTimes), | ||
| "server", server, "error", err, | ||
| ) | ||
|
|
||
| continue | ||
| } | ||
|
|
||
| clockOffset = response.ClockOffset | ||
|
|
||
| break | ||
| } | ||
|
|
||
| return clockOffset | ||
| } | ||
|
|
||
| func (c *Checker) checkClockOffset() { | ||
| ticker := time.NewTicker(c.interval) | ||
|
|
||
| for { | ||
| select { | ||
| case <-c.ctx.Done(): | ||
| return | ||
|
|
||
| case <-ticker.C: | ||
| c.lock.Lock() | ||
| c.offset = c.clockOffset() | ||
|
|
||
| if c.offset == maxClockOffset { | ||
| c.logger.Error("error on getting clock offset") | ||
| } else if c.OutOfSync(c.offset) { | ||
| c.logger.Error( | ||
| "The node is out of sync with the network time", | ||
| "threshold", c.GetThreshold(), | ||
| "offset", c.offset, | ||
| ) | ||
| } | ||
| c.lock.Unlock() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (c *Checker) OutOfSync(offset time.Duration) bool { | ||
| return math.Abs(float64(offset)) > float64(c.threshold) | ||
| } | ||
|
|
||
| func (c *Checker) String() string { | ||
|
Check failure on line 108 in util/ntp/ntp.go
|
||
| return "ntp" | ||
| } | ||
|
|
||
| func (c *Checker) Start() { | ||
| go c.checkClockOffset() | ||
| } | ||
|
|
||
| func (c *Checker) Stop() { | ||
| c.cancel() | ||
| } | ||
|
|
||
| func (c *Checker) GetThreshold() time.Duration { | ||
| return c.threshold | ||
| } | ||
|
|
||
| func (c *Checker) GetClockOffset() (time.Duration, error) { | ||
| c.lock.RLock() | ||
| offset := c.offset | ||
| c.lock.RUnlock() | ||
|
|
||
| if offset == maxClockOffset { | ||
| return 0, errors.New("error on getting clock offset") | ||
| } | ||
|
|
||
| return offset, nil | ||
| } | ||
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