save blob into local kv db

disperser/apiserver/server.go

@@ -162,10 +162,9 @@ func (s *DispersalServer) GetBlobStatus(ctx context.Context, req *pb.BlobStatusR
 			metadata = &disperser.BlobMetadata{
 				BlobStatus: disperser.Finalized,
 				ConfirmationInfo: &disperser.ConfirmationInfo{
-					DataRoot:                metadataFromKV.DataRoot,
-					Epoch:                   metadataFromKV.Epoch,
-					QuorumId:                metadataFromKV.QuorumId,
-					ConfirmationBlockNumber: metadataFromKV.BlockNumber,
+					DataRoot: metadataFromKV.DataRoot,
+					Epoch:    metadataFromKV.Epoch,
+					QuorumId: metadataFromKV.QuorumId,
 				},
 			}
 		} else {
@@ -211,6 +210,26 @@ func (s *DispersalServer) RetrieveBlob(ctx context.Context, req *pb.RetrieveBlob
 
 	s.logger.Info("[apiserver] received a new blob retrieval request", "blob storage root", req.StorageRoot, "blob epoch", req.Epoch, "quorum id", req.QuorumId)
 
+	metaData := disperser.BlobRetrieveMetadata{
+		DataRoot: req.StorageRoot,
+		Epoch:    req.Epoch,
+		QuorumId: req.QuorumId,
+	}
+	blobKey, err := metaData.Serialize()
+	if err != nil {
+		s.logger.Error("[apiserver] failed to serialize metadata")
+	} else {
+		data, err := s.kvStore.GetBlob(ctx, blobKey)
+		if err != nil {
+			s.logger.Error("[apiserver] failed to get blob for key", "blobKey", blobKey)
+		} else {
+			s.metrics.HandleSuccessfulRequest(len(data), "RetrieveBlob")
+			return &pb.RetrieveBlobReply{
+				Data: data,
+			}, nil
+		}
+	}
+
 	ctxWithTimeout, cancel := context.WithTimeout(ctx, 60*time.Second)
 	defer cancel()
 	conn, err := grpc.DialContext(

disperser/batcher/finalizer.go

@@ -214,12 +214,12 @@ func (f *finalizer) PersistConfirmedBlobs(ctx context.Context, metadatas []*disp
 
 	keys := make([][]byte, 0)
 	values := make([][]byte, 0)
+	blobs := make([][]byte, 0)
 	for _, metadata := range metadatas {
 		retrieveMetadata := disperser.BlobRetrieveMetadata{
-			DataRoot:    metadata.ConfirmationInfo.DataRoot,
-			Epoch:       metadata.ConfirmationInfo.Epoch,
-			QuorumId:    metadata.ConfirmationInfo.QuorumId,
-			BlockNumber: metadata.ConfirmationInfo.ConfirmationBlockNumber,
+			DataRoot: metadata.ConfirmationInfo.DataRoot,
+			Epoch:    metadata.ConfirmationInfo.Epoch,
+			QuorumId: metadata.ConfirmationInfo.QuorumId,
 		}
 
 		f.blobKeyCache.Add(retrieveMetadata.Hash(), retrieveMetadata.Epoch)
@@ -231,9 +231,15 @@ func (f *finalizer) PersistConfirmedBlobs(ctx context.Context, metadatas []*disp
 		key := []byte(metadata.GetBlobKey().String())
 		keys = append(keys, key)
 		values = append(values, val)
+
+		b, err := f.blobStore.GetBlobContent(ctx, metadata)
+		if err != nil {
+			return errors.WithMessage(err, "failed to get blob content")
+		}
+		blobs = append(blobs, b)
 	}
 
-	_, err := f.kvStore.StoreMetadataBatch(ctx, keys, values)
+	_, err := f.kvStore.StoreMetadataBatch(ctx, keys, values, blobs)
 	if err != nil {
 		return errors.WithMessage(err, "failed to save retrieve metadata to kv db")
 	}

disperser/disperser.go

@@ -95,10 +95,9 @@ func (b *BlobKeyCache) Contains(key [32]byte) bool {
 }
 
 type BlobRetrieveMetadata struct {
-	DataRoot    []byte
-	Epoch       uint64
-	QuorumId    uint64
-	BlockNumber uint32
+	DataRoot []byte
+	Epoch    uint64
+	QuorumId uint64
 }
 
 func (m *BlobRetrieveMetadata) Serialize() ([]byte, error) {

disperser/store.go

@@ -123,6 +123,17 @@ func (s *Store) deleteNBlobs(currentTimeUnixSec int64, numBatches int) (int, err
 			}
 
 			expiredKeys = append(expiredKeys, blobHeaderKey)
+
+			metaData, err := s.db.Get(blobHeaderKey)
+			if err != nil {
+				if errors.Is(err, leveldb.ErrNotFound) {
+					s.logger.Error("Cannot get metadata for key:", "metaData", metaData, "err", err)
+				} else {
+					return -1, err
+				}
+			}
+
+			expiredKeys = append(expiredKeys, metaData)
 		}
 	}
 
@@ -152,7 +163,7 @@ func (s *Store) StoreMetadata(ctx context.Context, key []byte, value []byte) err
 	return nil
 }
 
-func (s *Store) StoreMetadataBatch(ctx context.Context, blobKeys [][]byte, metadatas [][]byte) (*[][]byte, error) {
+func (s *Store) StoreMetadataBatch(ctx context.Context, blobKeys [][]byte, metadatas [][]byte, blobs [][]byte) (*[][]byte, error) {
 	keys := make([][]byte, 0)
 	values := make([][]byte, 0)
 
@@ -174,6 +185,9 @@ func (s *Store) StoreMetadataBatch(ctx context.Context, blobKeys [][]byte, metad
 		if _, err := buf.Write(key); err != nil {
 			return nil, err
 		}
+
+		keys = append(keys, metadatas[idx])
+		values = append(values, blobs[idx])
 	}
 
 	curr := time.Now().Unix()
@@ -212,6 +226,17 @@ func (s *Store) GetMetadata(ctx context.Context, key []byte) ([]byte, error) {
 	return data, nil
 }
 
+func (s *Store) GetBlob(ctx context.Context, blobKey []byte) ([]byte, error) {
+	data, err := s.db.Get(blobKey)
+	if err != nil {
+		if errors.Is(err, leveldb.ErrNotFound) {
+			return nil, ErrKeyNotFound
+		}
+		return nil, err
+	}
+	return data, nil
+}
+
 func (s *Store) MetadataIterator(ctx context.Context) iterator.Iterator {
 	return s.db.NewIterator(EncodeBlobHeaderKeyPrefix())
 }