frontend: implement GetBlockRange and GetTransaction

frontend/service.go

@@ -56,27 +56,87 @@ func (s *SqlStreamer) GetBlock(ctx context.Context, id *rpc.BlockID) (*rpc.Compa
 		return nil, ErrUnspecified
 	}
 
+	var blockBytes []byte
+	var err error
+
 	// Precedence: a hash is more specific than a height. If we have it, use it first.
 	if id.Hash != nil {
 		leHashString := hex.EncodeToString(id.Hash)
-		return storage.GetBlockByHash(ctx, s.db, leHashString)
+		blockBytes, err = storage.GetBlockByHash(ctx, s.db, leHashString)
+	} else {
+		blockBytes, err = storage.GetBlock(ctx, s.db, int(id.Height))
 	}
 
-	// we have a height and not a hash
-	if int(id.Height) > 0 {
-		return storage.GetBlock(ctx, s.db, int(id.Height))
+	if err != nil {
+		return nil, err
 	}
 
-	return nil, ErrUnspecified
+	cBlock := &rpc.CompactBlock{}
+	err = proto.Unmarshal(blockBytes, cBlock)
+	return cBlock, err
 }
 
-func (s *SqlStreamer) GetBlockRange(*rpc.BlockRange, rpc.CompactTxStreamer_GetBlockRangeServer) error {
-	return ErrNoImpl
+func (s *SqlStreamer) GetBlockRange(span *rpc.BlockRange, resp rpc.CompactTxStreamer_GetBlockRangeServer) error {
+	blocks := make(chan []byte)
+	errors := make(chan error)
+	done := make(chan bool)
+
+	timeout := resp.Context().WithTimeout(1 * time.Second)
+	go GetBlockRange(timeout, s.db, blocks, errors, done, span.Start, span.End)
+
+	for {
+		select {
+		case <-timeout.Done():
+			return timeout.Err()
+		case err := <-errors:
+			return err
+		case blockBytes := <-blocks:
+			cBlock := &rpc.CompactBlock{}
+			err = proto.Unmarshal(blockBytes, cBlock)
+			if err != nil {
+				return err // TODO really need better logging in this whole service
+			}
+			err = resp.Send(cBlock)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
 }
 
-func (s *SqlStreamer) GetTransaction(context.Context, *rpc.TxFilter) (*rpc.RawTransaction, error) {
-	return nil, ErrNoImpl
-}
-func (s *SqlStreamer) SendTransaction(context.Context, *rpc.RawTransaction) (*rpc.SendResponse, error) {
+func (s *SqlStreamer) GetTransaction(ctx context.Context, txf *rpc.TxFilter) (*rpc.RawTransaction, error) {
+	var txBytes []byte
+	var err error
+
+	if txf.Hash != nil {
+		leHashString := hex.EncodeToString(txf.Hash)
+		txBytes, err = storage.GetFullTxByHash(ctx, s.db, leHashString)
+		if err != nil {
+			return nil, err
+		}
+		return &rpc.RawTransaction{Data: txBytes}, nil
+
+	}
+
+	if txf.Block.Hash != nil {
+		leHashString := hex.EncodeToString(txf.Hash)
+		txBytes, err = storage.GetFullTxByHashAndIndex(ctx, s.db, leHashString, int(txf.Index))
+		if err != nil {
+			return nil, err
+		}
+		return &rpc.RawTransaction{Data: txBytes}, nil
+	}
+
+	// A totally unset protobuf will attempt to fetch the genesis coinbase tx.
+	txBytes, err = storage.GetFullTxByHeightAndIndex(ctx, s.db, int(txf.Block.Height), int(txf.Index))
+	if err != nil {
+		return nil, err
+	}
+	return &rpc.RawTransaction{Data: txBytes}, nil
+}
+
+func (s *SqlStreamer) SendTransaction(ctx context.Context, rawtx *rpc.RawTransaction) (*rpc.SendResponse, error) {
 	return nil, ErrNoImpl
 }