mirror of https://github.com/jetkvm/kvm.git
141 lines
3.3 KiB
Go
141 lines
3.3 KiB
Go
package timesync
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import (
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"context"
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"math/rand/v2"
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"strconv"
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"time"
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"github.com/beevik/ntp"
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)
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var defaultNTPServers = []string{
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"time.apple.com",
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"time.aws.com",
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"time.windows.com",
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"time.google.com",
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"162.159.200.123", // time.cloudflare.com IPv4
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"2606:4700:f1::123", // time.cloudflare.com IPv6
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"0.pool.ntp.org",
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"1.pool.ntp.org",
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"2.pool.ntp.org",
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"3.pool.ntp.org",
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}
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func (t *TimeSync) queryNetworkTime(ntpServers []string) (now *time.Time, offset *time.Duration) {
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chunkSize := int(t.networkConfig.TimeSyncParallel.ValueOr(4))
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t.l.Info().Strs("servers", ntpServers).Int("chunkSize", chunkSize).Msg("querying NTP servers")
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// shuffle the ntp servers to avoid always querying the same servers
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rand.Shuffle(len(ntpServers), func(i, j int) { ntpServers[i], ntpServers[j] = ntpServers[j], ntpServers[i] })
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for i := 0; i < len(ntpServers); i += chunkSize {
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chunk := ntpServers[i:min(i+chunkSize, len(ntpServers))]
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now, offset := t.queryMultipleNTP(chunk, timeSyncTimeout)
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if now != nil {
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return now, offset
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}
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}
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return nil, nil
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}
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type ntpResult struct {
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now *time.Time
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offset *time.Duration
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}
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func (t *TimeSync) queryMultipleNTP(servers []string, timeout time.Duration) (now *time.Time, offset *time.Duration) {
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results := make(chan *ntpResult, len(servers))
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_, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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for _, server := range servers {
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go func(server string) {
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scopedLogger := t.l.With().
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Str("server", server).
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Logger()
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// increase request count
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metricNtpTotalRequestCount.Inc()
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metricNtpRequestCount.WithLabelValues(server).Inc()
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// query the server
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now, response, err := queryNtpServer(server, timeout)
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if err != nil {
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scopedLogger.Warn().
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Str("error", err.Error()).
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Msg("failed to query NTP server")
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results <- nil
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return
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}
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if response.IsKissOfDeath() {
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scopedLogger.Warn().
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Str("kiss_code", response.KissCode).
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Msg("ignoring NTP server kiss of death")
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results <- nil
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return
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}
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rtt := float64(response.RTT.Milliseconds())
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// set the last RTT
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metricNtpServerLastRTT.WithLabelValues(
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server,
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).Set(rtt)
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// set the RTT histogram
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metricNtpServerRttHistogram.WithLabelValues(
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server,
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).Observe(rtt)
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// set the server info
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metricNtpServerInfo.WithLabelValues(
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server,
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response.ReferenceString(),
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strconv.Itoa(int(response.Stratum)),
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strconv.Itoa(int(response.Precision)),
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).Set(1)
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// increase success count
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metricNtpTotalSuccessCount.Inc()
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metricNtpSuccessCount.WithLabelValues(server).Inc()
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scopedLogger.Info().
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Str("time", now.Format(time.RFC3339)).
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Str("reference", response.ReferenceString()).
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Float64("rtt", rtt).
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Str("clockOffset", response.ClockOffset.String()).
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Uint8("stratum", response.Stratum).
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Msg("NTP server returned time")
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cancel()
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results <- &ntpResult{
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now: now,
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offset: &response.ClockOffset,
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}
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}(server)
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}
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for range servers {
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result := <-results
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if result == nil {
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continue
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}
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now, offset = result.now, result.offset
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return
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}
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return
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}
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func queryNtpServer(server string, timeout time.Duration) (now *time.Time, response *ntp.Response, err error) {
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resp, err := ntp.QueryWithOptions(server, ntp.QueryOptions{Timeout: timeout})
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if err != nil {
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return nil, nil, err
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}
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return &resp.Time, resp, nil
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}
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