Merge pull request #2085 from OffchainLabs/fix-delayed-seq-finality

Fix delayed sequencer finality not recognizing Arbitrum

Author: PlasmaPower

arbnode/delayed_sequencer.go

@@ -100,7 +100,7 @@ func (d *DelayedSequencer) sequenceWithoutLockout(ctx context.Context, lastBlock
 	}
 
 	var finalized uint64
-	if config.UseMergeFinality && lastBlockHeader.Difficulty.Sign() == 0 {
+	if config.UseMergeFinality && headerreader.HeaderIndicatesFinalitySupport(lastBlockHeader) {
 		var err error
 		if config.RequireFullFinality {
 			finalized, err = d.l1Reader.LatestFinalizedBlockNr(ctx)

util/headerreader/header_reader.go

@@ -436,7 +436,7 @@ func (s *HeaderReader) LastPendingCallBlockNr() uint64 {
 
 var ErrBlockNumberNotSupported = errors.New("block number not supported")
 
-func headerIndicatesFinalitySupport(header *types.Header) bool {
+func HeaderIndicatesFinalitySupport(header *types.Header) bool {
 	if header.Difficulty.Sign() == 0 {
 		// This is an Ethereum PoS chain
 		return true
@@ -466,7 +466,7 @@ func (s *HeaderReader) getCached(ctx context.Context, c *cachedHeader) (*types.H
 	if HeadersEqual(currentHead, c.headWhenCached) {
 		return c.header, nil
 	}
-	if !s.config().UseFinalityData || !headerIndicatesFinalitySupport(currentHead) {
+	if !s.config().UseFinalityData || !HeaderIndicatesFinalitySupport(currentHead) {
 		return nil, ErrBlockNumberNotSupported
 	}
 	header, err := s.client.HeaderByNumber(ctx, c.rpcBlockNum)