/
ntp.go
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/
ntp.go
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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package p2p
import (
"time"
"github.com/MOACChain/MoacLib/log"
"github.com/beevik/ntp"
)
//netServers definition
var ntpServers = [4]string{
"0.pool.ntp.org",
"1.pool.ntp.org",
"2.pool.ntp.org",
"3.pool.ntp.org",
}
//getNtpTime gets current time from NTP servers and log it for future reference.
func getNtpTime() {
for _, server := range ntpServers {
options := ntp.QueryOptions{Timeout: 30 * time.Second}
if response, err := ntp.QueryWithOptions(server, options); err == nil {
ntptime := time.Now().Add(response.ClockOffset)
log.Infof("[Current time] NTP: %v , LOCAL: %v", ntptime, time.Now())
// one success per round is enough
break
} else {
log.Infof("[Current time] err = %v", err)
}
}
}
//ntpCheck starts goroutine for logging NTP time.
func ntpCheck() {
for {
getNtpTime()
time.Sleep(5 * time.Minute)
}
}