dbft: fix prague fork bug

Author: qianhh

consensus/dbft/dbft.go

@@ -1794,6 +1794,17 @@ func (c *DBFT) verifyHeader(chain consensus.ChainHeaderReader, header *types.Hea
 	if !cancun && header.ParentBeaconRoot != nil {
 		return fmt.Errorf("invalid parentBeaconRoot, have %x, expected nil", header.ParentBeaconRoot)
 	}
+
+	prague := chain.Config().IsPrague(header.Number, header.Time)
+	if !prague {
+		if header.RequestsHash != nil {
+			return fmt.Errorf("invalid RequestsHash, have %#x, expected nil", header.RequestsHash)
+		}
+	} else {
+		if header.RequestsHash == nil {
+			return errors.New("header has nil RequestsHash after Prague")
+		}
+	}
 	// All basic checks passed, verify cascading fields
 	return c.verifyCascadingFields(chain, header, parents, isSealed)
 }

miner/worker.go

@@ -846,6 +846,10 @@ func (w *worker) prepareWork(genParams *generateParams, witness bool) (*environm
 		header.BlobGasUsed = new(uint64)
 		header.ExcessBlobGas = &excessBlobGas
 		header.ParentBeaconRoot = genParams.beaconRoot
+
+		if w.chainConfig.IsPrague(header.Number, header.Time) {
+			header.RequestsHash = &types.EmptyRequestsHash
+		}
 	}
 	// Could potentially happen if starting to mine in an odd state.
 	// Note genParams.coinbase can be different with header.Coinbase