// Copyright 2016 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 params
import (
"encoding/binary"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
// Genesis hashes to enforce below configs on.
var (
MainnetGenesisHash = common.HexToHash("0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3")
TestnetGenesisHash = common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d")
RinkebyGenesisHash = common.HexToHash("0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177")
GoerliGenesisHash = common.HexToHash("0xbf7e331f7f7c1dd2e05159666b3bf8bc7a8a3a9eb1d518969eab529dd9b88c1a")
)
// TrustedCheckpoints associates each known checkpoint with the genesis hash of
// the chain it belongs to.
var TrustedCheckpoints = map[common.Hash]*TrustedCheckpoint{
MainnetGenesisHash: MainnetTrustedCheckpoint,
TestnetGenesisHash: TestnetTrustedCheckpoint,
RinkebyGenesisHash: RinkebyTrustedCheckpoint,
GoerliGenesisHash: GoerliTrustedCheckpoint,
}
// CheckpointOracles associates each known checkpoint oracles with the genesis hash of
// the chain it belongs to.
var CheckpointOracles = map[common.Hash]*CheckpointOracleConfig{
MainnetGenesisHash: MainnetCheckpointOracle,
TestnetGenesisHash: TestnetCheckpointOracle,
RinkebyGenesisHash: RinkebyCheckpointOracle,
GoerliGenesisHash: GoerliCheckpointOracle,
}
var (
// MainnetChainConfig is the chain parameters to run a node on the main network.
MainnetChainConfig = &ChainConfig{
ChainID: big.NewInt(1),
HomesteadBlock: big.NewInt(1150000),
DAOForkBlock: big.NewInt(1920000),
DAOForkSupport: true,
EIP150Block: big.NewInt(2463000),
EIP150Hash: common.HexToHash("0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0"),
EIP155Block: big.NewInt(2675000),
EIP158Block: big.NewInt(2675000),
ByzantiumBlock: big.NewInt(4370000),
ConstantinopleBlock: big.NewInt(7280000),
PetersburgBlock: big.NewInt(7280000),
Ethash: new(EthashConfig),
}
// MainnetTrustedCheckpoint contains the light client trusted checkpoint for the main network.
MainnetTrustedCheckpoint = &TrustedCheckpoint{
SectionIndex: 246,
SectionHead: common.HexToHash("0xb86fbe8a2b1f3c576d06fe1721cd976f98ac1cbf1823da16ef74811e85fd44ac"),
CHTRoot: common.HexToHash("0xe99b397f908a391d0d6bd41d1c19cea4bf5051a9695c94d58de44c538d7a1037"),
BloomRoot: common.HexToHash("0xa1c1e064ccc16690c5fbabf600c4c7ebb2d8e8fcc674e59365087a77fb391a47"),
}
// MainnetCheckpointOracle contains a set of configs for the main network oracle.
MainnetCheckpointOracle = &CheckpointOracleConfig{
Address: common.HexToAddress("0x9a9070028361F7AAbeB3f2F2Dc07F82C4a98A02a"),
Signers: []common.Address{
common.HexToAddress("0x1b2C260efc720BE89101890E4Db589b44E950527"), // Peter
common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
},
Threshold: 2,
}
// TestnetChainConfig contains the chain parameters to run a node on the Ropsten test network.
TestnetChainConfig = &ChainConfig{
ChainID: big.NewInt(3),
HomesteadBlock: big.NewInt(0),
DAOForkBlock: nil,
DAOForkSupport: true,
EIP150Block: big.NewInt(0),
EIP150Hash: common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d"),
EIP155Block: big.NewInt(10),
EIP158Block: big.NewInt(10),
ByzantiumBlock: big.NewInt(1700000),
ConstantinopleBlock: big.NewInt(4230000),
PetersburgBlock: big.NewInt(4939394),
Ethash: new(EthashConfig),
}
// TestnetTrustedCheckpoint contains the light client trusted checkpoint for the Ropsten test network.
TestnetTrustedCheckpoint = &TrustedCheckpoint{
SectionIndex: 180,
SectionHead: common.HexToHash("0xc5741683f9fcff7b670732deef2ebe6e7ff7a7bb29249401300b13b4eee690a6"),
CHTRoot: common.HexToHash("0xf03ccebbf71a0998833afdf0e7c29095138c2df1cee6ed44ad9da62b5206b8ad"),
BloomRoot: common.HexToHash("0xec46c48cf218891c91ad1139d3b3aec7cf385d4c1100c06711e56b83d8993b23"),
}
// TestnetCheckpointOracle contains a set of configs for the Ropsten test network oracle.
TestnetCheckpointOracle = &CheckpointOracleConfig{
Address: common.HexToAddress("0xEF79475013f154E6A65b54cB2742867791bf0B84"),
Signers: []common.Address{
common.HexToAddress("0x32162F3581E88a5f62e8A61892B42C46E2c18f7b"), // Peter
common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
},
Threshold: 2,
}
// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
RinkebyChainConfig = &ChainConfig{
ChainID: big.NewInt(4),
HomesteadBlock: big.NewInt(1),
DAOForkBlock: nil,
DAOForkSupport: true,
EIP150Block: big.NewInt(2),
EIP150Hash: common.HexToHash("0x9b095b36c15eaf13044373aef8ee0bd3a382a5abb92e402afa44b8249c3a90e9"),
EIP155Block: big.NewInt(3),
EIP158Block: big.NewInt(3),
ByzantiumBlock: big.NewInt(1035301),
ConstantinopleBlock: big.NewInt(3660663),
PetersburgBlock: big.NewInt(4321234),
Clique: &CliqueConfig{
Period: 15,
Epoch: 30000,
},
}
// RinkebyTrustedCheckpoint contains the light client trusted checkpoint for the Rinkeby test network.
RinkebyTrustedCheckpoint = &TrustedCheckpoint{
SectionIndex: 142,
SectionHead: common.HexToHash("0xf7e3946d54c3040d391edd61a855fec7293f9d0b51445ede88562f2dc2edce3f"),
CHTRoot: common.HexToHash("0xb2beee185e3ecada83eb69f72cbcca3e0978dbc8da5cdb3e34a71b3d597815d0"),
BloomRoot: common.HexToHash("0x3970039fee31eb0542090030d1567cc99b8051572d51899db4d91619ca26f0cb"),
}
// RinkebyCheckpointOracle contains a set of configs for the Rinkeby test network oracle.
RinkebyCheckpointOracle = &CheckpointOracleConfig{
Address: common.HexToAddress("0xebe8eFA441B9302A0d7eaECc277c09d20D684540"),
Signers: []common.Address{
common.HexToAddress("0xd9c9cd5f6779558b6e0ed4e6acf6b1947e7fa1f3"), // Peter
common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
},
Threshold: 2,
}
// GoerliChainConfig contains the chain parameters to run a node on the Görli test network.
GoerliChainConfig = &ChainConfig{
ChainID: big.NewInt(5),
HomesteadBlock: big.NewInt(0),
DAOForkBlock: nil,
DAOForkSupport: true,
EIP150Block: big.NewInt(0),
EIP155Block: big.NewInt(0),
EIP158Block: big.NewInt(0),
ByzantiumBlock: big.NewInt(0),
ConstantinopleBlock: big.NewInt(0),
PetersburgBlock: big.NewInt(0),
Clique: &CliqueConfig{
Period: 15,
Epoch: 30000,
},
}
// GoerliTrustedCheckpoint contains the light client trusted checkpoint for the Görli test network.
GoerliTrustedCheckpoint = &TrustedCheckpoint{
SectionIndex: 26,
SectionHead: common.HexToHash("0xd0c206e064c8efea930d97e56786af95354ea481b35294a20e5a340937e4c2c9"),
CHTRoot: common.HexToHash("0xce7235999aa8d73c4493b8f397474dafc627652a790dec60c4a968e2dfa5d7be"),
BloomRoot: common.HexToHash("0xc1ac19553473ebb07325b5092a09277d62e9ffe159166a1c6fbec614c4dfd885"),
}
// GoerliCheckpointOracle contains a set of configs for the Goerli test network oracle.
GoerliCheckpointOracle = &CheckpointOracleConfig{
Address: common.HexToAddress("0x18CA0E045F0D772a851BC7e48357Bcaab0a0795D"),
Signers: []common.Address{
common.HexToAddress("0x4769bcaD07e3b938B7f43EB7D278Bc7Cb9efFb38"), // Peter
common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
},
Threshold: 2,
}
// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
// and accepted by the Ethereum core developers into the Ethash consensus.
//
// This configuration is intentionally not using keyed fields to force anyone
// adding flags to the config to also have to set these fields.
AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
// and accepted by the Ethereum core developers into the Clique consensus.
//
// This configuration is intentionally not using keyed fields to force anyone
// adding flags to the config to also have to set these fields.
AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
TestRules = TestChainConfig.Rules(new(big.Int))
)
// TrustedCheckpoint represents a set of post-processed trie roots (CHT and
// BloomTrie) associated with the appropriate section index and head hash. It is
// used to start light syncing from this checkpoint and avoid downloading the
// entire header chain while still being able to securely access old headers/logs.
type TrustedCheckpoint struct {
SectionIndex uint64 `json:"sectionIndex"`
SectionHead common.Hash `json:"sectionHead"`
CHTRoot common.Hash `json:"chtRoot"`
BloomRoot common.Hash `json:"bloomRoot"`
}
// HashEqual returns an indicator comparing the itself hash with given one.
func (c *TrustedCheckpoint) HashEqual(hash common.Hash) bool {
if c.Empty() {
return hash == common.Hash{}
}
return c.Hash() == hash
}
// Hash returns the hash of checkpoint's four key fields(index, sectionHead, chtRoot and bloomTrieRoot).
func (c *TrustedCheckpoint) Hash() common.Hash {
buf := make([]byte, 8+3*common.HashLength)
binary.BigEndian.PutUint64(buf, c.SectionIndex)
copy(buf[8:], c.SectionHead.Bytes())
copy(buf[8+common.HashLength:], c.CHTRoot.Bytes())
copy(buf[8+2*common.HashLength:], c.BloomRoot.Bytes())
return crypto.Keccak256Hash(buf)
}
// Empty returns an indicator whether the checkpoint is regarded as empty.
func (c *TrustedCheckpoint) Empty() bool {
return c.SectionHead == (common.Hash{}) || c.CHTRoot == (common.Hash{}) || c.BloomRoot == (common.Hash{})
}
// CheckpointOracleConfig represents a set of checkpoint contract(which acts as an oracle)
// config which used for light client checkpoint syncing.
type CheckpointOracleConfig struct {
Address common.Address `json:"address"`
Signers []common.Address `json:"signers"`
Threshold uint64 `json:"threshold"`
}
// ChainConfig is the core config which determines the blockchain settings.
//
// ChainConfig is stored in the database on a per block basis. This means
// that any network, identified by its genesis block, can have its own
// set of configuration options.
type ChainConfig struct {
ChainID *big.Int `json:"chainId"` // chainId identifies the current chain and is used for replay protection
HomesteadBlock *big.Int `json:"homesteadBlock,omitempty"` // Homestead switch block (nil = no fork, 0 = already homestead)
DAOForkBlock *big.Int `json:"daoForkBlock,omitempty"` // TheDAO hard-fork switch block (nil = no fork)
DAOForkSupport bool `json:"daoForkSupport,omitempty"` // Whether the nodes supports or opposes the DAO hard-fork
// EIP150 implements the Gas price changes (https://github.com/ethereum/EIPs/issues/150)
EIP150Block *big.Int `json:"eip150Block,omitempty"` // EIP150 HF block (nil = no fork)
EIP150Hash common.Hash `json:"eip150Hash,omitempty"` // EIP150 HF hash (needed for header only clients as only gas pricing changed)
EIP155Block *big.Int `json:"eip155Block,omitempty"` // EIP155 HF block
EIP158Block *big.Int `json:"eip158Block,omitempty"` // EIP158 HF block
ByzantiumBlock *big.Int `json:"byzantiumBlock,omitempty"` // Byzantium switch block (nil = no fork, 0 = already on byzantium)
ConstantinopleBlock *big.Int `json:"constantinopleBlock,omitempty"` // Constantinople switch block (nil = no fork, 0 = already activated)
PetersburgBlock *big.Int `json:"petersburgBlock,omitempty"` // Petersburg switch block (nil = same as Constantinople)
EWASMBlock *big.Int `json:"ewasmBlock,omitempty"` // EWASM switch block (nil = no fork, 0 = already activated)
// Various consensus engines
Ethash *EthashConfig `json:"ethash,omitempty"`
Clique *CliqueConfig `json:"clique,omitempty"`
}
// EthashConfig is the consensus engine configs for proof-of-work based sealing.
type EthashConfig struct{}
// String implements the stringer interface, returning the consensus engine details.
func (c *EthashConfig) String() string {
return "ethash"
}
// CliqueConfig is the consensus engine configs for proof-of-authority based sealing.
type CliqueConfig struct {
Period uint64 `json:"period"` // Number of seconds between blocks to enforce
Epoch uint64 `json:"epoch"` // Epoch length to reset votes and checkpoint
}
// String implements the stringer interface, returning the consensus engine details.
func (c *CliqueConfig) String() string {
return "clique"
}
// String implements the fmt.Stringer interface.
func (c *ChainConfig) String() string {
var engine interface{}
switch {
case c.Ethash != nil:
engine = c.Ethash
case c.Clique != nil:
engine = c.Clique
default:
engine = "unknown"
}
return fmt.Sprintf("{ChainID: %v Homestead: %v DAO: %v DAOSupport: %v EIP150: %v EIP155: %v EIP158: %v Byzantium: %v Constantinople: %v Petersburg: %v Engine: %v}",
c.ChainID,
c.HomesteadBlock,
c.DAOForkBlock,
c.DAOForkSupport,
c.EIP150Block,
c.EIP155Block,
c.EIP158Block,
c.ByzantiumBlock,
c.ConstantinopleBlock,
c.PetersburgBlock,
engine,
)
}
// IsHomestead returns whether num is either equal to the homestead block or greater.
func (c *ChainConfig) IsHomestead(num *big.Int) bool {
return isForked(c.HomesteadBlock, num)
}
// IsDAOFork returns whether num is either equal to the DAO fork block or greater.
func (c *ChainConfig) IsDAOFork(num *big.Int) bool {
return isForked(c.DAOForkBlock, num)
}
// IsEIP150 returns whether num is either equal to the EIP150 fork block or greater.
func (c *ChainConfig) IsEIP150(num *big.Int) bool {
return isForked(c.EIP150Block, num)
}
// IsEIP155 returns whether num is either equal to the EIP155 fork block or greater.
func (c *ChainConfig) IsEIP155(num *big.Int) bool {
return isForked(c.EIP155Block, num)
}
// IsEIP158 returns whether num is either equal to the EIP158 fork block or greater.
func (c *ChainConfig) IsEIP158(num *big.Int) bool {
return isForked(c.EIP158Block, num)
}
// IsByzantium returns whether num is either equal to the Byzantium fork block or greater.
func (c *ChainConfig) IsByzantium(num *big.Int) bool {
return isForked(c.ByzantiumBlock, num)
}
// IsConstantinople returns whether num is either equal to the Constantinople fork block or greater.
func (c *ChainConfig) IsConstantinople(num *big.Int) bool {
return isForked(c.ConstantinopleBlock, num)
}
// IsPetersburg returns whether num is either
// - equal to or greater than the PetersburgBlock fork block,
// - OR is nil, and Constantinople is active
func (c *ChainConfig) IsPetersburg(num *big.Int) bool {
return isForked(c.PetersburgBlock, num) || c.PetersburgBlock == nil && isForked(c.ConstantinopleBlock, num)
}
// IsEWASM returns whether num represents a block number after the EWASM fork
func (c *ChainConfig) IsEWASM(num *big.Int) bool {
return isForked(c.EWASMBlock, num)
}
// GasTable returns the gas table corresponding to the current phase (homestead or homestead reprice).
//
// The returned GasTable's fields shouldn't, under any circumstances, be changed.
func (c *ChainConfig) GasTable(num *big.Int) GasTable {
if num == nil {
return GasTableHomestead
}
switch {
case c.IsConstantinople(num):
return GasTableConstantinople
case c.IsEIP158(num):
return GasTableEIP158
case c.IsEIP150(num):
return GasTableEIP150
default:
return GasTableHomestead
}
}
// CheckCompatible checks whether scheduled fork transitions have been imported
// with a mismatching chain configuration.
func (c *ChainConfig) CheckCompatible(newcfg *ChainConfig, height uint64) *ConfigCompatError {
bhead := new(big.Int).SetUint64(height)
// Iterate checkCompatible to find the lowest conflict.
var lasterr *ConfigCompatError
for {
err := c.checkCompatible(newcfg, bhead)
if err == nil || (lasterr != nil && err.RewindTo == lasterr.RewindTo) {
break
}
lasterr = err
bhead.SetUint64(err.RewindTo)
}
return lasterr
}
func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *ConfigCompatError {
if isForkIncompatible(c.HomesteadBlock, newcfg.HomesteadBlock, head) {
return newCompatError("Homestead fork block", c.HomesteadBlock, newcfg.HomesteadBlock)
}
if isForkIncompatible(c.DAOForkBlock, newcfg.DAOForkBlock, head) {
return newCompatError("DAO fork block", c.DAOForkBlock, newcfg.DAOForkBlock)
}
if c.IsDAOFork(head) && c.DAOForkSupport != newcfg.DAOForkSupport {
return newCompatError("DAO fork support flag", c.DAOForkBlock, newcfg.DAOForkBlock)
}
if isForkIncompatible(c.EIP150Block, newcfg.EIP150Block, head) {
return newCompatError("EIP150 fork block", c.EIP150Block, newcfg.EIP150Block)
}
if isForkIncompatible(c.EIP155Block, newcfg.EIP155Block, head) {
return newCompatError("EIP155 fork block", c.EIP155Block, newcfg.EIP155Block)
}
if isForkIncompatible(c.EIP158Block, newcfg.EIP158Block, head) {
return newCompatError("EIP158 fork block", c.EIP158Block, newcfg.EIP158Block)
}
if c.IsEIP158(head) && !configNumEqual(c.ChainID, newcfg.ChainID) {
return newCompatError("EIP158 chain ID", c.EIP158Block, newcfg.EIP158Block)
}
if isForkIncompatible(c.ByzantiumBlock, newcfg.ByzantiumBlock, head) {
return newCompatError("Byzantium fork block", c.ByzantiumBlock, newcfg.ByzantiumBlock)
}
if isForkIncompatible(c.ConstantinopleBlock, newcfg.ConstantinopleBlock, head) {
return newCompatError("Constantinople fork block", c.ConstantinopleBlock, newcfg.ConstantinopleBlock)
}
if isForkIncompatible(c.PetersburgBlock, newcfg.PetersburgBlock, head) {
return newCompatError("Petersburg fork block", c.PetersburgBlock, newcfg.PetersburgBlock)
}
if isForkIncompatible(c.EWASMBlock, newcfg.EWASMBlock, head) {
return newCompatError("ewasm fork block", c.EWASMBlock, newcfg.EWASMBlock)
}
return nil
}
// isForkIncompatible returns true if a fork scheduled at s1 cannot be rescheduled to
// block s2 because head is already past the fork.
func isForkIncompatible(s1, s2, head *big.Int) bool {
return (isForked(s1, head) || isForked(s2, head)) && !configNumEqual(s1, s2)
}
// isForked returns whether a fork scheduled at block s is active at the given head block.
func isForked(s, head *big.Int) bool {
if s == nil || head == nil {
return false
}
return s.Cmp(head) <= 0
}
func configNumEqual(x, y *big.Int) bool {
if x == nil {
return y == nil
}
if y == nil {
return x == nil
}
return x.Cmp(y) == 0
}
// ConfigCompatError is raised if the locally-stored blockchain is initialised with a
// ChainConfig that would alter the past.
type ConfigCompatError struct {
What string
// block numbers of the stored and new configurations
StoredConfig, NewConfig *big.Int
// the block number to which the local chain must be rewound to correct the error
RewindTo uint64
}
func newCompatError(what string, storedblock, newblock *big.Int) *ConfigCompatError {
var rew *big.Int
switch {
case storedblock == nil:
rew = newblock
case newblock == nil || storedblock.Cmp(newblock) < 0:
rew = storedblock
default:
rew = newblock
}
err := &ConfigCompatError{what, storedblock, newblock, 0}
if rew != nil && rew.Sign() > 0 {
err.RewindTo = rew.Uint64() - 1
}
return err
}
func (err *ConfigCompatError) Error() string {
return fmt.Sprintf("mismatching %s in database (have %d, want %d, rewindto %d)", err.What, err.StoredConfig, err.NewConfig, err.RewindTo)
}
// Rules wraps ChainConfig and is merely syntactic sugar or can be used for functions
// that do not have or require information about the block.
//
// Rules is a one time interface meaning that it shouldn't be used in between transition
// phases.
type Rules struct {
ChainID *big.Int
IsHomestead, IsEIP150, IsEIP155, IsEIP158 bool
IsByzantium, IsConstantinople, IsPetersburg bool
}
// Rules ensures c's ChainID is not nil.
func (c *ChainConfig) Rules(num *big.Int) Rules {
chainID := c.ChainID
if chainID == nil {
chainID = new(big.Int)
}
return Rules{
ChainID: new(big.Int).Set(chainID),
IsHomestead: c.IsHomestead(num),
IsEIP150: c.IsEIP150(num),
IsEIP155: c.IsEIP155(num),
IsEIP158: c.IsEIP158(num),
IsByzantium: c.IsByzantium(num),
IsConstantinople: c.IsConstantinople(num),
IsPetersburg: c.IsPetersburg(num),
}
}
