fix(op-node): eth_client replace eth_getFinalizedBlock to eth_getFina…

…lizedHeader (#67)

* fix(op-node): eth_client replace eth_getFinalizedBlock to eth_getFinalizedHeader

* fix error msg catch

op-node/sources/eth_client.go

@@ -310,7 +310,7 @@ func (s *EthClient) InfoByLabel(ctx context.Context, label eth.BlockLabel) (eth.
 func (s *EthClient) BSCInfoByLabel(ctx context.Context, label eth.BlockLabel) (eth.BlockInfo, error) {
 	// can't hit the cache when querying the head due to reorgs / changes.
 	if label == eth.Finalized {
-		return s.headerCall(ctx, "eth_getFinalizedBlock", numberID(15))
+		return s.bscFinalizedHeader(ctx, 21)
 	}
 	return s.headerCall(ctx, "eth_getBlockByNumber", label)
 }
@@ -438,3 +438,20 @@ func (s *EthClient) ReadStorageAt(ctx context.Context, address common.Address, s
 func (s *EthClient) Close() {
 	s.client.Close()
 }
+
+func (s *EthClient) bscFinalizedHeader(ctx context.Context, probabilisticFinalized int64) (eth.BlockInfo, error) {
+	var header *rpcHeader
+	err := s.client.CallContext(ctx, &header, "eth_getFinalizedHeader", probabilisticFinalized) // headers are just blocks without txs
+	if err != nil {
+		return nil, err
+	}
+	if header == nil {
+		return nil, ethereum.NotFound
+	}
+	info, err := header.Info(s.trustRPC, s.mustBePostMerge)
+	if err != nil {
+		return nil, err
+	}
+	s.headersCache.Add(info.Hash(), info)
+	return info, nil
+}

op-node/sources/l1_client.go

@@ -87,7 +87,7 @@ func NewL1Client(client client.RPC, log log.Logger, metrics caching.Metrics, con
 // Notice, we cannot cache a block reference by label because labels are not guaranteed to be unique.
 func (s *L1Client) L1BlockRefByLabel(ctx context.Context, label eth.BlockLabel) (eth.L1BlockRef, error) {
 	info, err := s.BSCInfoByLabel(ctx, label)
-	if label == eth.Finalized && err != nil && strings.Contains(err.Error(), "eth_getFinalizedBlock does not exist") {
+	if label == eth.Finalized && err != nil && strings.Contains(err.Error(), "eth_getFinalizedHeader does not exist") {
 		// op-e2e not support bsc as L1 currently, so fallback to not use bsc specific method eth_getFinalizedBlock
 		info, err = s.InfoByLabel(ctx, label)
 	}