| 52 | } |
| 53 | |
| 54 | func (s *listCacheStorage) readBlobsFromCache(ctx context.Context, prefix blob.ID) *cachedList { |
| 55 | cl := &cachedList{} |
| 56 | |
| 57 | var data gather.WriteBuffer |
| 58 | defer data.Close() |
| 59 | |
| 60 | if err := s.cacheStorage.GetBlob(ctx, prefix, 0, -1, &data); err != nil { |
| 61 | return nil |
| 62 | } |
| 63 | |
| 64 | var verified gather.WriteBuffer |
| 65 | defer verified.Close() |
| 66 | |
| 67 | if err := hmac.VerifyAndStrip(data.Bytes(), s.hmacSecret, &verified); err != nil { |
| 68 | log(ctx).Warnf("invalid list cache HMAC for %v, ignoring", prefix) |
| 69 | return nil |
| 70 | } |
| 71 | |
| 72 | if err := json.NewDecoder(verified.Bytes().Reader()).Decode(&cl); err != nil { |
| 73 | log(ctx).Warnf("can't unmarshal cached list results for %v, ignoring", prefix) |
| 74 | return nil |
| 75 | } |
| 76 | |
| 77 | if s.cacheTimeFunc().Before(cl.ExpireAfter) { |
| 78 | return cl |
| 79 | } |
| 80 | |
| 81 | // list cache expired |
| 82 | return nil |
| 83 | } |
| 84 | |
| 85 | // ListBlobs implements blob.Storage and caches previous list results for a given prefix. |
| 86 | func (s *listCacheStorage) ListBlobs(ctx context.Context, prefix blob.ID, cb func(blob.Metadata) error) error { |