// 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")
}
}
// Get returns the Instance corresponding to the Project, Zone, and Name defined in the
// Deployer's Conf.
func (d *Deployer) Get() (*compute.Instance, error) {
computeService, err := compute.New(d.Client)
if err != nil {
return nil, err
}
return computeService.Instances.Get(d.Conf.Project, d.Conf.Zone, d.Conf.Name).Do()
}
// Create sets up and starts a Google Compute Engine instance as defined in d.Conf. It
// creates the necessary Google Storage buckets beforehand.
func (d *Deployer) Create(ctx *context.Context) (*compute.Instance, error) {
if err := d.checkProjectID(); err != nil {
return nil, err
}
computeService, _ := compute.New(d.Client)
storageService, _ := storage.New(d.Client)
fwc := make(chan error, 1)
go func() {
fwc <- d.setFirewall(ctx, computeService)
}()
config := cloudConfig(d.Conf)
const maxCloudConfig = 32 << 10 // per compute API docs
if len(config) > maxCloudConfig {
return nil, fmt.Errorf("cloud config length of %d bytes is over %d byte limit", len(config), maxCloudConfig)
}
// TODO(mpl): maybe add a wipe mode where we erase other instances before attempting to create.
if zone, err := d.projectHasInstance(); zone != "" {
return nil, instanceExistsError{
project: d.Conf.Project,
zone: zone,
}
} else if err != nil {
return nil, fmt.Errorf("could not scan project for existing instances: %v", err)
}
if err := d.setBuckets(storageService, ctx); err != nil {
return nil, fmt.Errorf("could not create buckets: %v", err)
}
if err := d.setupHTTPS(storageService); err != nil {
return nil, fmt.Errorf("could not setup HTTPS: %v", err)
}
if err := d.createInstance(computeService, ctx); err != nil {
return nil, fmt.Errorf("could not create compute instance: %v", err)
}
inst, err := computeService.Instances.Get(d.Conf.Project, d.Conf.Zone, d.Conf.Name).Do()
if err != nil {
return nil, fmt.Errorf("error getting instance after creation: %v", err)
}
if Verbose {
ij, _ := json.MarshalIndent(inst, "", " ")
log.Printf("Instance: %s", ij)
}
if err = <-fwc; err != nil {
return nil, fmt.Errorf("could not create firewall rules: %v", err)
}
return inst, nil
}
func (h *DeployHandler) refreshZones() error {
h.zonesMu.Lock()
defer h.zonesMu.Unlock()
defer func() {
h.regions = make([]string, 0, len(h.zones))
for r, _ := range h.zones {
h.regions = append(h.regions, r)
}
}()
// TODO(mpl): get projectID and access tokens from metadata once camweb is on GCE.
accountFile := os.Getenv("CAMLI_GCE_SERVICE_ACCOUNT")
if accountFile == "" {
h.Printf("No service account to query for the zones, using hard-coded ones instead.")
h.zones = backupZones
return nil
}
project := os.Getenv("CAMLI_GCE_PROJECT")
if project == "" {
h.Printf("No project we can query on to get the zones, using hard-coded ones instead.")
h.zones = backupZones
return nil
}
data, err := ioutil.ReadFile(accountFile)
if err != nil {
return err
}
conf, err := google.JWTConfigFromJSON(data, "https://www.googleapis.com/auth/compute.readonly")
if err != nil {
return err
}
s, err := compute.New(conf.Client(oauth2.NoContext))
if err != nil {
return err
}
rl, err := compute.NewRegionsService(s).List(project).Do()
if err != nil {
return fmt.Errorf("could not get a list of regions: %v", err)
}
h.zones = make(map[string][]string)
for _, r := range rl.Items {
zones := make([]string, 0, len(r.Zones))
for _, z := range r.Zones {
zone := path.Base(z)
if zone == "europe-west1-a" {
// Because even though the docs mark it as deprecated, it still shows up here, go figure.
continue
}
zone = strings.Replace(zone, r.Name, "", 1)
zones = append(zones, zone)
}
h.zones[r.Name] = zones
}
return nil
}
func (d *Deployer) checkProjectID() error {
// TODO(mpl): cache the computeService in Deployer, instead of recreating a new one everytime?
s, err := compute.New(d.Client)
if err != nil {
return projectIDError{
id: d.Conf.Project,
cause: err,
}
}
project, err := compute.NewProjectsService(s).Get(d.Conf.Project).Do()
if err != nil {
return projectIDError{
id: d.Conf.Project,
cause: err,
}
}
if project.Name != d.Conf.Project {
return projectIDError{
id: d.Conf.Project,
cause: fmt.Errorf("project ID do not match: got %q, wanted %q", project.Name, d.Conf.Project),
}
}
return nil
}
