mirror of https://github.com/jetkvm/kvm.git
99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
package kvm
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import (
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"errors"
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"fmt"
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"log"
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"net/http"
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"os/exec"
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"time"
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"github.com/beevik/ntp"
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)
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var timeSynced = false
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func TimeSyncLoop() {
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for {
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fmt.Println("Syncing system time")
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start := time.Now()
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err := SyncSystemTime()
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if err != nil {
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log.Printf("Failed to sync system time: %v", err)
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continue
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}
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log.Printf("Time sync successful, now is: %v, time taken: %v", time.Now(), time.Since(start))
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timeSynced = true
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time.Sleep(1 * time.Hour) //once the first sync is done, sync every hour
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}
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}
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func SyncSystemTime() (err error) {
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now, err := queryNetworkTime()
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if err != nil {
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return fmt.Errorf("failed to query network time: %w", err)
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}
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err = setSystemTime(*now)
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if err != nil {
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return fmt.Errorf("failed to set system time: %w", err)
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}
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return nil
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}
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func queryNetworkTime() (*time.Time, error) {
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ntpServers := []string{
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"time.cloudflare.com",
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"time.apple.com",
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}
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for _, server := range ntpServers {
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now, err := queryNtpServer(server, 2*time.Second)
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if err == nil {
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return now, nil
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}
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}
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httpUrls := []string{
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"http://apple.com",
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"http://cloudflare.com",
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}
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for _, url := range httpUrls {
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now, err := queryHttpTime(url, 2*time.Second)
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if err == nil {
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return now, nil
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}
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}
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return nil, errors.New("failed to query network time")
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}
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func queryNtpServer(server string, timeout time.Duration) (now *time.Time, 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, err
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}
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return &resp.Time, nil
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}
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func queryHttpTime(url string, timeout time.Duration) (*time.Time, error) {
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client := http.Client{
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Timeout: timeout,
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}
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resp, err := client.Head(url)
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if err != nil {
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return nil, err
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}
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dateStr := resp.Header.Get("Date")
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now, err := time.Parse(time.RFC1123, dateStr)
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if err != nil {
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return nil, err
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}
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return &now, nil
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}
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func setSystemTime(now time.Time) error {
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nowStr := now.Format("2006-01-02 15:04:05")
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output, err := exec.Command("date", "-s", nowStr).CombinedOutput()
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if err != nil {
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return fmt.Errorf("failed to run date -s: %w, %s", err, string(output))
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}
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return nil
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}
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