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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,62 +1,109 @@ | ||
| package ntp | ||
|
|
||
| import ( | ||
| "context" | ||
| "math" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/beevik/ntp" | ||
| "github.com/pactus-project/pactus/util/errors" | ||
| "github.com/pactus-project/pactus/util/logger" | ||
| ) | ||
|
|
||
| type Server struct { | ||
| threshold time.Duration | ||
| logger *logger.SubLogger | ||
| serverList []string | ||
| } | ||
|
|
||
| func NewNtpServer() *Server { | ||
| server := &Server{ | ||
| threshold: 1 * time.Second, | ||
| serverList: []string{ | ||
| "0.pool.ntp.org", | ||
| "1.pool.ntp.org", | ||
| "2.pool.ntp.org", | ||
| "3.pool.ntp.org", | ||
| }, | ||
| } | ||
| const ( | ||
| maxClockOffset = time.Duration(math.MinInt64) | ||
| ) | ||
|
|
||
| type Checker struct { | ||
| lock sync.RWMutex | ||
| ctx context.Context | ||
| cancel func() | ||
|
|
||
| ticker *time.Ticker | ||
| threshold time.Duration | ||
| offset time.Duration | ||
| interval time.Duration | ||
| } | ||
|
|
||
| server.logger = logger.NewSubLogger("_ntp", server) | ||
| func NewNtpChecker(interval, threshold time.Duration) *Checker { | ||
| ctxWithCancel, cancel := context.WithCancel(context.Background()) | ||
| server := &Checker{ | ||
| ctx: ctxWithCancel, | ||
| cancel: cancel, | ||
| interval: interval, | ||
| threshold: threshold, | ||
| ticker: time.NewTicker(interval), | ||
| } | ||
|
|
||
| return server | ||
| } | ||
|
|
||
| func (s *Server) ClockOffset() time.Duration { | ||
| clockOffset := time.Duration(math.MinInt64) | ||
| func (*Checker) clockOffset() time.Duration { | ||
| server := "pool.ntp.org" | ||
| response, err := ntp.Query(server) | ||
| if err != nil { | ||
| logger.Error("ntp error", "server", server, "error", err) | ||
|
|
||
| for _, server := range s.serverList { | ||
| remoteTime, err := ntp.Time(server) | ||
| if err != nil { | ||
| s.logger.Debug("ntp error", "server", server, "error", err) | ||
| return maxClockOffset | ||
| } | ||
|
|
||
| continue | ||
| } | ||
| if err := response.Validate(); err != nil { | ||
| logger.Error("ntp error", "server", server, "error", err) | ||
|
|
||
| clockOffset = time.Since(remoteTime) | ||
| return maxClockOffset | ||
| } | ||
|
|
||
| break | ||
| return response.ClockOffset | ||
| } | ||
|
|
||
| func (c *Checker) checkClockOffset() { | ||
| for { | ||
| select { | ||
| case <-c.ctx.Done(): | ||
| return | ||
|
|
||
| case <-c.ticker.C: | ||
| offset := c.clockOffset() | ||
| c.lock.Lock() | ||
| c.offset = offset | ||
| c.lock.Unlock() | ||
|
|
||
| if c.offset == maxClockOffset { | ||
| logger.Error("error on getting clock offset") | ||
| } else if c.OutOfSync(offset) { | ||
| logger.Error( | ||
| "The node is out of sync with the network time", | ||
| "threshold", c.threshold, | ||
| "offset", offset, | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return clockOffset | ||
| func (c *Checker) OutOfSync(offset time.Duration) bool { | ||
| return math.Abs(float64(offset)) > float64(c.threshold) | ||
| } | ||
|
|
||
| func (s *Server) String() string { | ||
| return "ntp" | ||
| func (c *Checker) Start() { | ||
| go c.checkClockOffset() | ||
| } | ||
|
|
||
| func (s *Server) GetThreshold() time.Duration { | ||
| return s.threshold | ||
| func (c *Checker) Stop() { | ||
| c.cancel() | ||
| c.ticker.Stop() | ||
| } | ||
|
|
||
| func (s *Server) OutOfSync(offset time.Duration) bool { | ||
| return math.Abs(float64(offset)) > float64(s.threshold) | ||
| func (c *Checker) GetClockOffset() (time.Duration, error) { | ||
| c.lock.RLock() | ||
| defer c.lock.RUnlock() | ||
|
|
||
| offset := c.offset | ||
|
|
||
| if offset == maxClockOffset { | ||
| return 0, errors.Errorf(errors.ErrNtpError, "unable to get clock offset") | ||
| } | ||
|
|
||
| return offset, nil | ||
| } |
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