/
image_cleaner.go
258 lines (203 loc) · 5.2 KB
/
image_cleaner.go
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package gcloudcleanup
import (
"math/rand"
"net/url"
"strings"
"time"
"google.golang.org/api/compute/v1"
"github.com/sirupsen/logrus"
"github.com/travis-ci/gcloud-cleanup/metrics"
"github.com/travis-ci/gcloud-cleanup/ratelimit"
)
type imageCleaner struct {
cs *compute.Service
log *logrus.Entry
projectID string
jobBoardURL string
filters []string
noop bool
rateLimiter ratelimit.RateLimiter
rateLimitMaxCalls uint64
rateLimitDuration time.Duration
}
type imageDeletionRequest struct {
Image *compute.Image
Reason string
}
func newImageCleaner(
cs *compute.Service,
log *logrus.Logger,
rateLimiter ratelimit.RateLimiter,
rateLimitMaxCalls uint64,
rateLimitDuration time.Duration,
projectID,
jobBoardURL string,
filters []string,
noop bool,
) *imageCleaner {
return &imageCleaner{
cs: cs,
log: log.WithField("component", "image_cleaner"),
projectID: projectID,
jobBoardURL: jobBoardURL,
filters: filters,
noop: noop,
rateLimiter: rateLimiter,
rateLimitMaxCalls: rateLimitMaxCalls,
rateLimitDuration: rateLimitDuration,
}
}
func (ic *imageCleaner) Run() error {
ic.log.WithFields(logrus.Fields{
"project": ic.projectID,
"filters": strings.Join(ic.filters, ","),
}).Info("running image cleanup")
registeredImages, err := ic.fetchRegisteredImages()
if err != nil {
return err
}
if len(registeredImages) == 0 {
ic.log.Warn("no registered images?")
return nil
}
ic.l2met("gauge#images.registered", len(registeredImages), "fetched registered images")
imgChan := make(chan *imageDeletionRequest)
errChan := make(chan error)
go ic.fetchImagesToDelete(registeredImages, imgChan, errChan)
go func() {
for err := range errChan {
if err == nil {
continue
}
ic.log.WithField("err", err).Warn("error during image fetch")
}
}()
nDeleted := 0
for req := range imgChan {
if req == nil {
break
}
if ic.noop {
ic.log.WithField("image", req.Image.Name).Debug("not really deleting image")
continue
}
err := ic.deleteImage(req.Image)
if err != nil {
ic.log.WithFields(logrus.Fields{
"err": err,
"image": req.Image.Name,
}).Warn("failed to delete image")
}
nDeleted++
ic.log.WithFields(logrus.Fields{
"image": req.Image.Name,
"reason": req.Reason,
}).Info("deleted")
}
metrics.Gauge("travis.gcloud-cleanup.images.deleted", int64(nDeleted))
ic.l2met("measure#images.deleted", nDeleted, "done running image cleanup")
return nil
}
func (ic *imageCleaner) fetchRegisteredImages() (map[string]bool, error) {
images := map[string]bool{}
nameFilter := ""
for _, filter := range ic.filters {
if !strings.HasPrefix(filter, "name eq") {
continue
}
nameFilter = strings.Replace(filter, "name eq", "", -1)
nameFilter = strings.Trim(strings.TrimSpace(nameFilter), "'\"")
}
if nameFilter == "" {
nameFilter = "^travis-ci.*"
}
qs := url.Values{}
qs.Set("infra", "gce")
qs.Set("fields[images]", "name")
qs.Set("name", nameFilter)
u, err := url.Parse(ic.jobBoardURL)
u.Path = "/images"
u.RawQuery = qs.Encode()
if err != nil {
return images, err
}
imageResp, err := makeJobBoardImagesRequest(u.String())
if err != nil {
return images, err
}
if len(imageResp.Data) == 0 {
return images, err
}
for _, imgRef := range imageResp.Data {
images[imgRef.Name] = true
}
return images, nil
}
func (ic *imageCleaner) fetchImagesToDelete(registeredImages map[string]bool,
imgChan chan *imageDeletionRequest, errChan chan error) {
listCall := ic.cs.Images.List(ic.projectID)
for _, filter := range ic.filters {
listCall.Filter(filter)
}
pageTok := ""
nImages := 0
for {
if pageTok != "" {
listCall.PageToken(pageTok)
}
ic.apiRateLimit()
ic.log.WithField("page_token", pageTok).Debug("fetching images list")
resp, err := listCall.Do()
if err != nil {
errChan <- err
continue
}
for _, image := range resp.Items {
nImages++
if _, ok := registeredImages[image.Name]; !ok {
ic.log.WithField("image", image.Name).Debug("sending image for deletion")
imgChan <- &imageDeletionRequest{Image: image, Reason: "not-registered"}
continue
}
ic.log.WithField("image", image.Name).Debug("skipping image")
}
if resp.NextPageToken == "" {
ic.log.Debug("no next page, breaking out of loop")
break
}
ic.log.Debug("continuing to next page")
pageTok = resp.NextPageToken
}
ic.l2met("gauge#images.count", nImages, "done checking all images")
imgChan <- nil
errChan <- nil
}
func (ic *imageCleaner) deleteImage(image *compute.Image) error {
ic.apiRateLimit()
_, err := ic.cs.Images.Delete(ic.projectID, image.Name).Do()
return err
}
func (ic *imageCleaner) l2met(name string, n int, msg string) {
ic.log.WithField(name, n).Info(msg)
}
func (ic *imageCleaner) apiRateLimit() error {
ic.log.Debug("waiting for rate limiter tick")
errCount := 0
for {
ok, err := ic.rateLimiter.RateLimit("gce-api", ic.rateLimitMaxCalls, ic.rateLimitDuration)
if err != nil {
errCount++
if errCount >= 5 {
ic.log.WithField("err", err).Info("rate limiter errored 5 times")
return err
}
} else {
errCount = 0
}
if ok {
return nil
}
// Sleep for up to 1 second
time.Sleep(time.Millisecond * time.Duration(rand.Intn(1000)))
}
}