Example #1
0
// projectHasInstance checks for all the possible zones if there's already an instance for the project.
// It returns the name of the zone at the first instance it finds, if any.
func (d *Deployer) projectHasInstance() (zone string, err error) {
	s, err := compute.New(d.Client)
	if err != nil {
		return "", err
	}
	// TODO(mpl): make use of the handler's cached zones.
	zl, err := compute.NewZonesService(s).List(d.Conf.Project).Do()
	if err != nil {
		return "", fmt.Errorf("could not get a list of zones: %v", err)
	}
	computeService, _ := compute.New(d.Client)
	var zoneOnce sync.Once
	var grp syncutil.Group
	errc := make(chan error, 1)
	zonec := make(chan string, 1)
	timeout := time.NewTimer(30 * time.Second)
	defer timeout.Stop()
	for _, z := range zl.Items {
		z := z
		grp.Go(func() error {
			list, err := computeService.Instances.List(d.Conf.Project, z.Name).Do()
			if err != nil {
				return fmt.Errorf("could not list existing instances: %v", err)
			}
			if len(list.Items) > 0 {
				zoneOnce.Do(func() {
					zonec <- z.Name
				})
			}
			return nil
		})
	}
	go func() {
		errc <- grp.Err()
	}()
	// We block until either an instance was found in a zone, or all the instance
	// listing is done. Or we timed-out.
	select {
	case err = <-errc:
		return "", err
	case zone = <-zonec:
		// We voluntarily ignore any listing error if we found at least one instance
		// because that's what we primarily want to report about.
		return zone, nil
	case <-timeout.C:
		return "", errors.New("timed out")
	}
}
Example #2
0
// TODO(bradfitz,mpl): move this to go4.org/cloud/google/gceutil
func ZonesOfRegion(hc *http.Client, project, region string) (zones []string, err error) {
	s, err := compute.New(hc)
	if err != nil {
		return nil, err
	}
	zl, err := compute.NewZonesService(s).List(project).Do()
	if err != nil {
		return nil, fmt.Errorf("could not get a list of zones: %v", err)
	}
	if zl.NextPageToken != "" {
		return nil, errors.New("TODO: more than one page of zones found; use NextPageToken")
	}
	for _, z := range zl.Items {
		if path.Base(z.Region) != region {
			continue
		}
		zones = append(zones, z.Name)
	}
	return zones, nil
}