support for forwarding sendRawTransactionConditional to seqRPC

eth/backend.go

@@ -377,12 +377,7 @@ func (s *Ethereum) APIs() []rpc.API {
 
 	// Append any Sequencer APIs as enabled
 	if s.config.RollupSequencerEnableTxConditional {
-		// an effort to detect if running in a non-sequencer mode
-		if len(s.config.RollupSequencerHTTP) > 0 {
-			log.Warn("SendRawTransactionConditional enabled when RollupSequencerHTTP is defined. Skipping...")
-		} else {
-			apis = append(apis, sequencerapi.GetSendRawTxConditionalAPI(s.APIBackend))
-		}
+		apis = append(apis, sequencerapi.GetSendRawTxConditionalAPI(s.APIBackend, s.seqRPCService))
 	}
 
 	// Append all the local APIs and return

internal/sequencerapi/api.go

@@ -21,13 +21,14 @@ var (
 )
 
 type sendRawTxCond struct {
-	b ethapi.Backend
+	b      ethapi.Backend
+	seqRPC *rpc.Client
 }
 
-func GetSendRawTxConditionalAPI(b ethapi.Backend) rpc.API {
+func GetSendRawTxConditionalAPI(b ethapi.Backend, seqRPC *rpc.Client) rpc.API {
 	return rpc.API{
 		Namespace: "eth",
-		Service:   &sendRawTxCond{b},
+		Service:   &sendRawTxCond{b, seqRPC},
 	}
 }
 
@@ -75,15 +76,21 @@ func (s *sendRawTxCond) SendRawTransactionConditional(ctx context.Context, txByt
 		}
 	}
 
-	tx := new(types.Transaction)
-	if err := tx.UnmarshalBinary(txBytes); err != nil {
-		return common.Hash{}, err
-	}
-
-	// Set internal fields
-	tx.SetTime(time.Now())
-	tx.SetConditional(&cond)
-	sendRawTxConditionalAcceptedCounter.Inc(1)
+	// forward if seqRPC is set, otherwise submit the tx
+	if s.seqRPC != nil {
+		var hash common.Hash
+		err := s.seqRPC.CallContext(ctx, &hash, "eth_sendRawTransactionConditional", txBytes, cond)
+		return hash, err
+	} else {
+		tx := new(types.Transaction)
+		if err := tx.UnmarshalBinary(txBytes); err != nil {
+			return common.Hash{}, err
+		}
 
-	return ethapi.SubmitTransaction(ctx, s.b, tx)
+		// Set out-of-consensus internal tx fields
+		tx.SetTime(time.Now())
+		tx.SetConditional(&cond)
+		sendRawTxConditionalAcceptedCounter.Inc(1)
+		return ethapi.SubmitTransaction(ctx, s.b, tx)
+	}
 }