+
+// If possible, translate an Azure SDK error to a recognizable error
+// like os.ErrNotExist.
+func (v *AzureBlobVolume) translateError(err error) error {
+ switch {
+ case err == nil:
+ return err
+ case strings.Contains(err.Error(), "Not Found"):
+ // "storage: service returned without a response body (404 Not Found)"
+ return os.ErrNotExist
+ default:
+ return err
+ }
+}
+
+var keepBlockRegexp = regexp.MustCompile(`^[0-9a-f]{32}$`)
+
+func (v *AzureBlobVolume) isKeepBlock(s string) bool {
+ return keepBlockRegexp.MatchString(s)
+}
+
+// EmptyTrash looks for trashed blocks that exceeded trashLifetime
+// and deletes them from the volume.
+func (v *AzureBlobVolume) EmptyTrash() {
+ var bytesDeleted, bytesInTrash int64
+ var blocksDeleted, blocksInTrash int
+ params := storage.ListBlobsParameters{Include: "metadata"}
+
+ for {
+ resp, err := v.bsClient.ListBlobs(v.containerName, params)
+ if err != nil {
+ log.Printf("EmptyTrash: ListBlobs: %v", err)
+ break
+ }
+ for _, b := range resp.Blobs {
+ // Check if the block is expired
+ if b.Metadata["expires_at"] == "" {
+ continue
+ }
+
+ blocksInTrash++
+ bytesInTrash += b.Properties.ContentLength
+
+ expiresAt, err := strconv.ParseInt(b.Metadata["expires_at"], 10, 64)
+ if err != nil {
+ log.Printf("EmptyTrash: ParseInt(%v): %v", b.Metadata["expires_at"], err)
+ continue
+ }
+
+ if expiresAt > time.Now().Unix() {
+ continue
+ }
+
+ err = v.bsClient.DeleteBlob(v.containerName, b.Name, map[string]string{
+ "If-Match": b.Properties.Etag,
+ })
+ if err != nil {
+ log.Printf("EmptyTrash: DeleteBlob(%v): %v", b.Name, err)
+ continue
+ }
+ blocksDeleted++
+ bytesDeleted += b.Properties.ContentLength
+ }
+ if resp.NextMarker == "" {
+ break
+ }
+ params.Marker = resp.NextMarker
+ }
+
+ log.Printf("EmptyTrash stats for %v: Deleted %v bytes in %v blocks. Remaining in trash: %v bytes in %v blocks.", v.String(), bytesDeleted, blocksDeleted, bytesInTrash-bytesDeleted, blocksInTrash-blocksDeleted)
+}