140 lines
4.0 KiB
Go
140 lines
4.0 KiB
Go
package storage
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import (
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"path"
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"strings"
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"time"
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"github.com/docker/distribution/context"
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storageDriver "github.com/docker/distribution/registry/storage/driver"
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"github.com/docker/distribution/uuid"
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log "github.com/sirupsen/logrus"
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)
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// uploadData stored the location of temporary files created during a layer upload
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// along with the date the upload was started
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type uploadData struct {
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containingDir string
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startedAt time.Time
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}
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func newUploadData() uploadData {
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return uploadData{
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containingDir: "",
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// default to far in future to protect against missing startedat
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startedAt: time.Now().Add(time.Duration(10000 * time.Hour)),
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}
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}
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// PurgeUploads deletes files from the upload directory
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// created before olderThan. The list of files deleted and errors
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// encountered are returned
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func PurgeUploads(ctx context.Context, driver storageDriver.StorageDriver, olderThan time.Time, actuallyDelete bool) ([]string, []error) {
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log.Infof("PurgeUploads starting: olderThan=%s, actuallyDelete=%t", olderThan, actuallyDelete)
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uploadData, errors := getOutstandingUploads(ctx, driver)
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var deleted []string
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for _, uploadData := range uploadData {
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if uploadData.startedAt.Before(olderThan) {
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var err error
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log.Infof("Upload files in %s have older date (%s) than purge date (%s). Removing upload directory.",
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uploadData.containingDir, uploadData.startedAt, olderThan)
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if actuallyDelete {
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err = driver.Delete(ctx, uploadData.containingDir)
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}
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if err == nil {
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deleted = append(deleted, uploadData.containingDir)
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} else {
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errors = append(errors, err)
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}
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}
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}
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log.Infof("Purge uploads finished. Num deleted=%d, num errors=%d", len(deleted), len(errors))
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return deleted, errors
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}
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// getOutstandingUploads walks the upload directory, collecting files
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// which could be eligible for deletion. The only reliable way to
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// classify the age of a file is with the date stored in the startedAt
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// file, so gather files by UUID with a date from startedAt.
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func getOutstandingUploads(ctx context.Context, driver storageDriver.StorageDriver) (map[string]uploadData, []error) {
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var errors []error
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uploads := make(map[string]uploadData, 0)
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inUploadDir := false
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root, err := pathFor(repositoriesRootPathSpec{})
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if err != nil {
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return uploads, append(errors, err)
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}
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err = Walk(ctx, driver, root, func(fileInfo storageDriver.FileInfo) error {
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filePath := fileInfo.Path()
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_, file := path.Split(filePath)
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if file[0] == '_' {
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// Reserved directory
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inUploadDir = (file == "_uploads")
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if fileInfo.IsDir() && !inUploadDir {
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return ErrSkipDir
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}
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}
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uuid, isContainingDir := uuidFromPath(filePath)
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if uuid == "" {
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// Cannot reliably delete
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return nil
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}
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ud, ok := uploads[uuid]
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if !ok {
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ud = newUploadData()
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}
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if isContainingDir {
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ud.containingDir = filePath
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}
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if file == "startedat" {
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if t, err := readStartedAtFile(driver, filePath); err == nil {
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ud.startedAt = t
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} else {
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errors = pushError(errors, filePath, err)
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}
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}
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uploads[uuid] = ud
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return nil
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})
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if err != nil {
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errors = pushError(errors, root, err)
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}
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return uploads, errors
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}
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// uuidFromPath extracts the upload UUID from a given path
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// If the UUID is the last path component, this is the containing
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// directory for all upload files
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func uuidFromPath(path string) (string, bool) {
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components := strings.Split(path, "/")
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for i := len(components) - 1; i >= 0; i-- {
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if u, err := uuid.Parse(components[i]); err == nil {
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return u.String(), i == len(components)-1
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}
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}
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return "", false
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}
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// readStartedAtFile reads the date from an upload's startedAtFile
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func readStartedAtFile(driver storageDriver.StorageDriver, path string) (time.Time, error) {
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// todo:(richardscothern) - pass in a context
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startedAtBytes, err := driver.GetContent(context.Background(), path)
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if err != nil {
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return time.Now(), err
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}
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startedAt, err := time.Parse(time.RFC3339, string(startedAtBytes))
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if err != nil {
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return time.Now(), err
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}
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return startedAt, nil
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}
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