/
ntp.go
59 lines (50 loc) · 1.32 KB
/
ntp.go
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package times
import (
"errors"
"math"
"os"
"time"
"bitbucket.org/cpchain/chain/commons/log"
"github.com/beevik/ntp"
)
var (
InvalidSystemClockErr = errors.New("invalid system clock,exceed max gap")
NtpServerNotAvailableErr = errors.New("ntp server not available")
MaxGapDuration = 10.0 // seconds
ntpServerList = []string{
"time.windows.com",
"0.pool.ntp.org",
"1.pool.ntp.org",
"2.pool.ntp.org",
"3.pool.ntp.org",
}
)
func NetworkTime(ntpServer []string) (time.Time, error) {
for _, ntpServer := range ntpServer {
time, err := ntp.Time(ntpServer)
if err == nil {
return time, err
}
}
return time.Now(), NtpServerNotAvailableErr
}
func InvalidSystemClock() error {
if os.Getenv("IGNORE_NTP_CHECK") != "" {
log.Debug("IGNORE NTP CHECK")
return nil
}
networkTime, err := NetworkTime(ntpServerList)
if err != nil {
// if ntp server not available,do nothing just print warning message.
log.Warn("ntp server not available, check your network please.", "err", err)
return err
}
now := time.Now()
dur := now.Sub(networkTime)
log.Debug("InvalidSystemClock", "now", now, "networkTime", networkTime, "duration(s)", dur.Seconds())
if math.Abs(dur.Seconds()) > MaxGapDuration {
log.Debug("duration exceed max gap", "seconds", dur.Seconds())
return InvalidSystemClockErr
}
return nil
}