feat(core): introduce BasefeeSharingPctg in BlockMetadata (#287)

* feat(core): introduce `BasefeeSharingPctg` in `BlockMetadata`

* feat: update message

* feat: check BasefeeSharingPctg

beacon/engine/types.go

@@ -64,16 +64,15 @@ type payloadAttributesMarshaling struct {
 // CHANGE(taiko): BlockMetadata represents a `BlockMetadata` struct defined in
 // protocol.
 type BlockMetadata struct {
-	// Fields defined in `LibData.blockMetadata`.
 	Beneficiary common.Address `json:"beneficiary"  gencodec:"required"`
 	GasLimit    uint64         `json:"gasLimit"     gencodec:"required"`
 	Timestamp   uint64         `json:"timestamp"    gencodec:"required"`
 	MixHash     common.Hash    `json:"mixHash"      gencodec:"required"`
 
 	// Extra fields required in taiko-geth.
-	TxList         []byte   `json:"txList"          gencodec:"required"`
-	HighestBlockID *big.Int `json:"highestBlockID"  gencodec:"required"`
-	ExtraData      []byte   `json:"extraData"       gencodec:"required"`
+	TxList             []byte `json:"txList"          gencodec:"required"`
+	ExtraData          []byte `json:"extraData"       gencodec:"required"`
+	BasefeeSharingPctg uint8  `json:"basefeeSharingPctg"`
 }
 
 // CHANGE(taiko): JSON type overrides for BlockMetadata.

core/state/statedb.go

@@ -138,6 +138,10 @@ type StateDB struct {
 
 	// Testing hooks
 	onCommit func(states *triestate.Set) // Hook invoked when commit is performed
+
+	// CHANGE(taiko): basefeeSharingPctg of the basefee will be sent to the block.coinbase,
+	// the remaining will be sent to the treasury address.
+	BasefeeSharingPctg uint8
 }
 
 // New creates a new state from a given trie.

core/state_processor.go

@@ -169,6 +169,8 @@ func ApplyTransaction(config *params.ChainConfig, bc ChainContext, author *commo
 	if err != nil {
 		return nil, err
 	}
+	// CHANGE(taiko): set `BasefeeSharingPctg` for the current message.
+	msg.BasefeeSharingPctg = statedb.BasefeeSharingPctg
 	// Create a new context to be used in the EVM environment
 	blockContext := NewEVMBlockContext(header, bc, author)
 	txContext := NewEVMTxContext(msg)

core/state_transition.go

@@ -149,6 +149,9 @@ type Message struct {
 
 	// CHANGE(taiko): whether the current transaction is the first TaikoL2.anchor transaction in a block.
 	IsAnchor bool
+	// CHANGE(taiko): basefeeSharingPctg of the basefee will be sent to the block.coinbase,
+	// the remaining will be sent to the treasury address.
+	BasefeeSharingPctg uint8
 }
 
 // TransactionToMessage converts a transaction into a Message.
@@ -467,12 +470,16 @@ func (st *StateTransition) TransitionDb() (*ExecutionResult, error) {
 		fee := new(uint256.Int).SetUint64(st.gasUsed())
 		fee.Mul(fee, effectiveTipU256)
 		st.state.AddBalance(st.evm.Context.Coinbase, fee)
-		// CHANGE(taiko): basefee is not burnt, but sent to a treasury instead.
+		// CHANGE(taiko): basefee is not burnt, but sent to a treasury and block.coinbase instead.
 		if st.evm.ChainConfig().Taiko && st.evm.Context.BaseFee != nil && !st.msg.IsAnchor {
-			st.state.AddBalance(
-				st.getTreasuryAddress(),
-				uint256.MustFromBig(new(big.Int).Mul(st.evm.Context.BaseFee, new(big.Int).SetUint64(st.gasUsed()))),
+			totalFee := new(big.Int).Mul(st.evm.Context.BaseFee, new(big.Int).SetUint64(st.gasUsed()))
+			feeCoinbase := new(big.Int).Div(
+				new(big.Int).Mul(totalFee, new(big.Int).SetUint64(uint64(st.msg.BasefeeSharingPctg))),
+				new(big.Int).SetUint64(100),
 			)
+			feeTreasury := new(big.Int).Sub(totalFee, feeCoinbase)
+			st.state.AddBalance(st.getTreasuryAddress(), uint256.MustFromBig(feeTreasury))
+			st.state.AddBalance(st.evm.Context.Coinbase, uint256.MustFromBig(feeCoinbase))
 		}
 	}
 

eth/catalyst/api.go

@@ -382,6 +382,11 @@ func (api *ConsensusAPI) forkchoiceUpdated(update engine.ForkchoiceStateV1, payl
 	if payloadAttributes != nil {
 		// CHANGE(taiko): create a L2 block by Taiko protocol.
 		if isTaiko {
+			if payloadAttributes.BlockMetadata.BasefeeSharingPctg > 100 {
+				return valid(nil), engine.InvalidPayloadAttributes.With(
+					fmt.Errorf("invalid basefeeSharingPctg %d", payloadAttributes.BlockMetadata.BasefeeSharingPctg),
+				)
+			}
 			// No need to check payloadAttribute here, because all its fields are
 			// marked as required.
 			block, err := api.eth.Miner().SealBlockWith(

miner/taiko_worker.go

@@ -170,6 +170,7 @@ func (w *worker) sealBlockWith(
 	defer env.discard()
 
 	env.header.GasLimit = blkMeta.GasLimit
+	env.state.BasefeeSharingPctg = blkMeta.BasefeeSharingPctg
 
 	// Commit transactions.
 	gasLimit := env.header.GasLimit