wip

core/state_transition.go

@@ -139,6 +139,7 @@ type Message struct {
 	AccessList    types.AccessList
 	BlobGasFeeCap *big.Int
 	BlobHashes    []common.Hash
+	Delegate      bool
 
 	// When SkipAccountChecks is true, the message nonce is not checked against the
 	// account nonce in state. It also disables checking that the sender is an EOA.
@@ -161,6 +162,7 @@ func TransactionToMessage(tx *types.Transaction, s types.Signer, baseFee *big.In
 		SkipAccountChecks: false,
 		BlobHashes:        tx.BlobHashes(),
 		BlobGasFeeCap:     tx.BlobGasFeeCap(),
+		Delegate:          tx.Delegate(),
 	}
 	// If baseFee provided, set gasPrice to effectiveGasPrice.
 	if baseFee != nil {
@@ -416,7 +418,12 @@ func (st *StateTransition) TransitionDb() (*ExecutionResult, error) {
 	} else {
 		// Increment the nonce for the next transaction
 		st.state.SetNonce(msg.From, st.state.GetNonce(sender.Address())+1)
-		ret, st.gasRemaining, vmerr = st.evm.Call(sender, st.to(), msg.Data, st.gasRemaining, msg.Value)
+		if !msg.Delegate {
+			ret, st.gasRemaining, vmerr = st.evm.Call(sender, st.to(), msg.Data, st.gasRemaining, msg.Value)
+		} else {
+			var contract = vm.NewContract(sender, sender, nil, st.gasRemaining)
+			ret, st.gasRemaining, vmerr = st.evm.DelegateCall(contract, st.to(), msg.Data, st.gasRemaining)
+		}
 	}
 
 	if !rules.IsLondon {

core/txpool/validation.go

@@ -66,6 +66,9 @@ func ValidateTransaction(tx *types.Transaction, blobs []kzg4844.Blob, commits []
 	if !opts.Config.IsCancun(head.Number, head.Time) && tx.Type() == types.BlobTxType {
 		return fmt.Errorf("%w: type %d rejected, pool not yet in Cancun", core.ErrTxTypeNotSupported, tx.Type())
 	}
+	if !opts.Config.IsPrague(head.Number, head.Time) && tx.Type() == types.DelegateTxType {
+		return fmt.Errorf("%w: type %d rejected, pool not yet in Prague", core.ErrTxTypeNotSupported, tx.Type())
+	}
 	// Check whether the init code size has been exceeded
 	if opts.Config.IsShanghai(head.Number, head.Time) && tx.To() == nil && len(tx.Data()) > params.MaxInitCodeSize {
 		return fmt.Errorf("%w: code size %v, limit %v", core.ErrMaxInitCodeSizeExceeded, len(tx.Data()), params.MaxInitCodeSize)

core/types/receipt.go

@@ -194,7 +194,7 @@ func (r *Receipt) decodeTyped(b []byte) error {
 		return errShortTypedReceipt
 	}
 	switch b[0] {
-	case DynamicFeeTxType, AccessListTxType, BlobTxType:
+	case DynamicFeeTxType, AccessListTxType, BlobTxType, DelegateTxType:
 		var data receiptRLP
 		err := rlp.DecodeBytes(b[1:], &data)
 		if err != nil {
@@ -302,7 +302,7 @@ func (rs Receipts) EncodeIndex(i int, w *bytes.Buffer) {
 	}
 	w.WriteByte(r.Type)
 	switch r.Type {
-	case AccessListTxType, DynamicFeeTxType, BlobTxType:
+	case AccessListTxType, DynamicFeeTxType, BlobTxType, DelegateTxType:
 		rlp.Encode(w, data)
 	default:
 		// For unsupported types, write nothing. Since this is for

core/types/transaction.go

@@ -46,6 +46,7 @@ const (
 	AccessListTxType = 0x01
 	DynamicFeeTxType = 0x02
 	BlobTxType       = 0x03
+	DelegateTxType   = 0x04
 )
 
 // Transaction is an Ethereum transaction.
@@ -68,7 +69,7 @@ func NewTx(inner TxData) *Transaction {
 
 // TxData is the underlying data of a transaction.
 //
-// This is implemented by DynamicFeeTx, LegacyTx and AccessListTx.
+// This is implemented by DynamicFeeTx, LegacyTx, AccessListTx and DelegateTx.
 type TxData interface {
 	txType() byte // returns the type ID
 	copy() TxData // creates a deep copy and initializes all fields
@@ -200,6 +201,10 @@ func (tx *Transaction) decodeTyped(b []byte) (TxData, error) {
 		var inner BlobTx
 		err := rlp.DecodeBytes(b[1:], &inner)
 		return &inner, err
+	case DelegateTxType:
+		var inner DelegateTx
+		err := rlp.DecodeBytes(b[1:], &inner)
+		return &inner, err
 	default:
 		return nil, ErrTxTypeNotSupported
 	}
@@ -264,6 +269,11 @@ func (tx *Transaction) Type() uint8 {
 	return tx.inner.txType()
 }
 
+// Delegate returns wether the transaction type corresponds to a delegate operation or not. (see EIP-5806)
+func (tx *Transaction) Delegate() bool {
+	return tx.inner.txType() == DelegateTxType
+}
+
 // ChainId returns the EIP155 chain ID of the transaction. The return value will always be
 // non-nil. For legacy transactions which are not replay-protected, the return value is
 // zero.

core/types/tx_delegate.go

@@ -0,0 +1,113 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+// DelegateTx represents an EIP-5806 transaction.
+type DelegateTx struct {
+	ChainID    *big.Int
+	Nonce      uint64
+	GasTipCap  *big.Int // a.k.a. maxPriorityFeePerGas
+	GasFeeCap  *big.Int // a.k.a. maxFeePerGas
+	Gas        uint64
+	To         *common.Address `rlp:"nil"` // nil means contract creation
+	Data       []byte
+	AccessList AccessList
+
+	// Signature values
+	V *big.Int `json:"v" gencodec:"required"`
+	R *big.Int `json:"r" gencodec:"required"`
+	S *big.Int `json:"s" gencodec:"required"`
+}
+
+// copy creates a deep copy of the transaction data and initializes all fields.
+func (tx *DelegateTx) copy() TxData {
+	cpy := &DelegateTx{
+		Nonce: tx.Nonce,
+		To:    copyAddressPtr(tx.To),
+		Data:  common.CopyBytes(tx.Data),
+		Gas:   tx.Gas,
+		// These are copied below.
+		AccessList: make(AccessList, len(tx.AccessList)),
+		ChainID:    new(big.Int),
+		GasTipCap:  new(big.Int),
+		GasFeeCap:  new(big.Int),
+		V:          new(big.Int),
+		R:          new(big.Int),
+		S:          new(big.Int),
+	}
+	copy(cpy.AccessList, tx.AccessList)
+	if tx.ChainID != nil {
+		cpy.ChainID.Set(tx.ChainID)
+	}
+	if tx.GasTipCap != nil {
+		cpy.GasTipCap.Set(tx.GasTipCap)
+	}
+	if tx.GasFeeCap != nil {
+		cpy.GasFeeCap.Set(tx.GasFeeCap)
+	}
+	if tx.V != nil {
+		cpy.V.Set(tx.V)
+	}
+	if tx.R != nil {
+		cpy.R.Set(tx.R)
+	}
+	if tx.S != nil {
+		cpy.S.Set(tx.S)
+	}
+	return cpy
+}
+
+// accessors for innerTx.
+func (tx *DelegateTx) txType() byte              { return DelegateTxType }
+func (tx *DelegateTx) chainID() *big.Int         { return tx.ChainID }
+func (tx *DelegateTx) accessList() AccessList    { return tx.AccessList }
+func (tx *DelegateTx) data() []byte              { return tx.Data }
+func (tx *DelegateTx) gas() uint64               { return tx.Gas }
+func (tx *DelegateTx) gasFeeCap() *big.Int       { return tx.GasFeeCap }
+func (tx *DelegateTx) gasTipCap() *big.Int       { return tx.GasTipCap }
+func (tx *DelegateTx) gasPrice() *big.Int        { return tx.GasFeeCap }
+func (tx *DelegateTx) value() *big.Int           { return big.NewInt(0) }
+func (tx *DelegateTx) nonce() uint64             { return tx.Nonce }
+func (tx *DelegateTx) to() *common.Address       { return tx.To }
+func (tx *DelegateTx) blobGas() uint64           { return 0 }
+func (tx *DelegateTx) blobGasFeeCap() *big.Int   { return nil }
+func (tx *DelegateTx) blobHashes() []common.Hash { return nil }
+
+func (tx *DelegateTx) effectiveGasPrice(dst *big.Int, baseFee *big.Int) *big.Int {
+	if baseFee == nil {
+		return dst.Set(tx.GasFeeCap)
+	}
+	tip := dst.Sub(tx.GasFeeCap, baseFee)
+	if tip.Cmp(tx.GasTipCap) > 0 {
+		tip.Set(tx.GasTipCap)
+	}
+	return tip.Add(tip, baseFee)
+}
+
+func (tx *DelegateTx) rawSignatureValues() (v, r, s *big.Int) {
+	return tx.V, tx.R, tx.S
+}
+
+func (tx *DelegateTx) setSignatureValues(chainID, v, r, s *big.Int) {
+	tx.ChainID, tx.V, tx.R, tx.S = chainID, v, r, s
+}