consensus, core/*: metropolis features

consensus/ethash/consensus.go

@@ -289,6 +289,8 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
 func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int {
 	next := new(big.Int).Add(parent.Number, common.Big1)
 	switch {
+	case config.IsMetropolis(next):
+		return calcDifficultyMetropolis(time, parent)
 	case config.IsHomestead(next):
 		return calcDifficultyHomestead(time, parent)
 	default:
@@ -299,10 +301,56 @@ func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Heade
 // Some weird constants to avoid constant memory allocs for them.
 var (
 	expDiffPeriod = big.NewInt(100000)
+	big9          = big.NewInt(9)
 	big10         = big.NewInt(10)
 	bigMinus99    = big.NewInt(-99)
 )
 
+func calcDifficultyMetropolis(time uint64, parent *types.Header) *big.Int {
+	bigTime := new(big.Int).SetUint64(time)
+	bigParentTime := new(big.Int).Set(parent.Time)
+
+	// adj_factor = max((2 if len(parent.uncles) else 1) - ((timestamp - parent.timestamp) // 9), -99)
+	var x *big.Int
+	if parent.UncleHash == types.EmptyUncleHash {
+		x = big.NewInt(1)
+	} else {
+		x = big.NewInt(2)
+	}
+	z := new(big.Int).Sub(bigTime, bigParentTime)
+	z.Div(z, big9)
+	x.Sub(x, z)
+
+	// max(1 - (block_timestamp - parent_timestamp) // 10, -99)))
+	if x.Cmp(bigMinus99) < 0 {
+		x.Set(bigMinus99)
+	}
+
+	// (parent_diff + parent_diff // 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99))
+	y := new(big.Int).Div(parent.Difficulty, params.DifficultyBoundDivisor)
+	x.Mul(y, x)
+	x.Add(parent.Difficulty, x)
+
+	// minimum difficulty can ever be (before exponential factor)
+	if x.Cmp(params.MinimumDifficulty) < 0 {
+		x.Set(params.MinimumDifficulty)
+	}
+
+	// for the exponential factor
+	periodCount := new(big.Int).Add(parent.Number, common.Big1)
+	periodCount.Div(periodCount, expDiffPeriod)
+
+	// the exponential factor, commonly referred to as "the bomb"
+	// diff = diff + 2^(periodCount - 2)
+	if periodCount.Cmp(common.Big1) > 0 {
+		y.Sub(periodCount, common.Big2)
+		y.Exp(common.Big2, y, nil)
+		x.Add(x, y)
+	}
+
+	return x
+}
+
 // calcDifficultyHomestead is the difficulty adjustment algorithm. It returns
 // the difficulty that a new block should have when created at time given the
 // parent block's time and difficulty. The calculation uses the Homestead rules.

core/state_processor.go

@@ -105,10 +105,15 @@ func ApplyTransaction(config *params.ChainConfig, bc *BlockChain, author *common
 
 	// Update the state with pending changes
 	usedGas.Add(usedGas, gas)
+	var root []byte
+	if config.IsMetropolis(header.Number) {
+		statedb.Finalise()
+	} else {
+		root = statedb.IntermediateRoot(config.IsEIP158(header.Number)).Bytes()
+	}
 	// Create a new receipt for the transaction, storing the intermediate root and gas used by the tx
 	// based on the eip phase, we're passing wether the root touch-delete accounts.
-	root := statedb.IntermediateRoot(config.IsEIP158(header.Number))
-	receipt := types.NewReceipt(root.Bytes(), usedGas)
+	receipt := types.NewReceipt(root, usedGas)
 	receipt.TxHash = tx.Hash()
 	receipt.GasUsed = new(big.Int).Set(gas)
 	// if the transaction created a contract, store the creation address in the receipt.

core/state_transition.go

@@ -236,7 +236,8 @@ func (st *StateTransition) TransitionDb() (ret []byte, requiredGas, usedGas *big
 		vmerr error
 	)
 	if contractCreation {
-		ret, _, st.gas, vmerr = evm.Create(sender, st.data, st.gas, st.value)
+		createAddressFn := vm.CreateAddressFn(st.evm.ChainConfig(), st.evm.BlockNumber, sender.Address(), st.state.GetNonce(sender.Address()), st.data)
+		ret, _, st.gas, vmerr = evm.Create(sender, createAddressFn, st.data, st.gas, st.value)
 	} else {
 		// Increment the nonce for the next transaction
 		st.state.SetNonce(sender.Address(), st.state.GetNonce(sender.Address())+1)

core/types/receipt.go

@@ -31,7 +31,7 @@ import (
 // Receipt represents the results of a transaction.
 type Receipt struct {
 	// Consensus fields
-	PostState         []byte   `json:"root"              gencodec:"required"`
+	PostState         []byte   `json:"root"`
 	CumulativeGasUsed *big.Int `json:"cumulativeGasUsed" gencodec:"required"`
 	Bloom             Bloom    `json:"logsBloom"         gencodec:"required"`
 	Logs              []*Log   `json:"logs"              gencodec:"required"`
@@ -48,6 +48,19 @@ type receiptMarshaling struct {
 	GasUsed           *hexutil.Big
 }
 
+type homesteadReceiptRLP struct {
+	PostState         []byte
+	CumulativeGasUsed *big.Int
+	Bloom             Bloom
+	Logs              []*Log
+}
+
+type metropolisReceiptRLP struct {
+	CumulativeGasUsed *big.Int
+	Bloom             Bloom
+	Logs              []*Log
+}
+
 // NewReceipt creates a barebone transaction receipt, copying the init fields.
 func NewReceipt(root []byte, cumulativeGasUsed *big.Int) *Receipt {
 	return &Receipt{PostState: common.CopyBytes(root), CumulativeGasUsed: new(big.Int).Set(cumulativeGasUsed)}
@@ -56,23 +69,28 @@ func NewReceipt(root []byte, cumulativeGasUsed *big.Int) *Receipt {
 // EncodeRLP implements rlp.Encoder, and flattens the consensus fields of a receipt
 // into an RLP stream.
 func (r *Receipt) EncodeRLP(w io.Writer) error {
-	return rlp.Encode(w, []interface{}{r.PostState, r.CumulativeGasUsed, r.Bloom, r.Logs})
+	if r.PostState == nil {
+		return rlp.Encode(w, &metropolisReceiptRLP{r.CumulativeGasUsed, r.Bloom, r.Logs})
+	} else {
+		return rlp.Encode(w, &homesteadReceiptRLP{r.PostState, r.CumulativeGasUsed, r.Bloom, r.Logs})
+	}
 }
 
 // DecodeRLP implements rlp.Decoder, and loads the consensus fields of a receipt
 // from an RLP stream.
 func (r *Receipt) DecodeRLP(s *rlp.Stream) error {
-	var receipt struct {
-		PostState         []byte
-		CumulativeGasUsed *big.Int
-		Bloom             Bloom
-		Logs              []*Log
-	}
-	if err := s.Decode(&receipt); err != nil {
+	raw, err := s.Raw()
+	if err != nil {
 		return err
 	}
-	r.PostState, r.CumulativeGasUsed, r.Bloom, r.Logs = receipt.PostState, receipt.CumulativeGasUsed, receipt.Bloom, receipt.Logs
-	return nil
+	var hr homesteadReceiptRLP
+	var mr metropolisReceiptRLP
+	if err = rlp.DecodeBytes(raw, &mr); err == nil {
+		r.CumulativeGasUsed, r.Bloom, r.Logs = mr.CumulativeGasUsed, mr.Bloom, mr.Logs
+	} else if err = rlp.DecodeBytes(raw, &hr); err == nil {
+		r.PostState, r.CumulativeGasUsed, r.Bloom, r.Logs = hr.PostState[:], hr.CumulativeGasUsed, hr.Bloom, hr.Logs
+	}
+	return err
 }
 
 // String implements the Stringer interface.

core/types/transaction_signing.go

@@ -45,6 +45,8 @@ type sigCache struct {
 func MakeSigner(config *params.ChainConfig, blockNumber *big.Int) Signer {
 	var signer Signer
 	switch {
+	case config.IsMetropolis(blockNumber):
+		signer = NewEIP86Signer(config.ChainId)
 	case config.IsEIP155(blockNumber):
 		signer = NewEIP155Signer(config.ChainId)
 	case config.IsHomestead(blockNumber):
@@ -88,6 +90,10 @@ func Sender(signer Signer, tx *Transaction) (common.Address, error) {
 
 	pubkey, err := signer.PublicKey(tx)
 	if err != nil {
+		if err == errAbstractSigner {
+			return abstractSignerAddress, nil
+		}
+
 		return common.Address{}, err
 	}
 	var addr common.Address
@@ -108,6 +114,37 @@ type Signer interface {
 	Equal(Signer) bool
 }
 
+// EIP86Signer implements the the abstract signing feature
+type EIP86Signer struct {
+	EIP155Signer
+}
+
+func NewEIP86Signer(chainId *big.Int) EIP86Signer {
+	return EIP86Signer{
+		EIP155Signer: NewEIP155Signer(chainId),
+	}
+}
+
+func (s EIP86Signer) Equal(s2 Signer) bool {
+	_, ok := s2.(EIP86Signer)
+	return ok && s.EIP155Signer.Equal(s2)
+}
+
+// isAbstractSigner checks whether the transaction signature is that of
+// the abstract signer. The abstract signer is determined by V being equal
+// to the chain identifier and r and s being 0.
+func isAbstractSigner(tx *Transaction, chainId *big.Int) bool {
+	v, r, s := tx.RawSignatureValues()
+	return v.Cmp(chainId) == 0 && r.BitLen() == 0 && s.BitLen() == 0
+}
+
+func (s EIP86Signer) PublicKey(tx *Transaction) ([]byte, error) {
+	if isAbstractSigner(tx, s.chainId) {
+		return nil, errAbstractSigner
+	}
+	return s.EIP155Signer.PublicKey(tx)
+}
+
 // EIP155Transaction implements TransactionInterface using the
 // EIP155 rules
 type EIP155Signer struct {