path: root/params/config.go

// 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 (
    "fmt"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
)

var (
    // MainnetChainConfig is the chain parameters to run a node on the main network.
    MainnetChainConfig = &ChainConfig{
        ChainId:         MainNetChainID,
        HomesteadBlock:  MainNetHomesteadBlock,
        DAOForkBlock:    MainNetDAOForkBlock,
        DAOForkSupport:  true,
        EIP150Block:     MainNetHomesteadGasRepriceBlock,
        EIP150Hash:      MainNetHomesteadGasRepriceHash,
        EIP155Block:     MainNetSpuriousDragon,
        EIP158Block:     MainNetSpuriousDragon,
        MetropolisBlock: MainNetMetropolisBlock,

        Ethash: new(EthashConfig),
    }

    // 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),
        MetropolisBlock: TestNetMetropolisBlock,

        Ethash: new(EthashConfig),
    }

    // 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),
        MetropolisBlock: TestNetMetropolisBlock,

        Clique: &CliqueConfig{
            Period: 15,
            Epoch:  30000,
        },
    }

    // AllProtocolChanges contains every protocol change (EIPs)
    // introduced and accepted by the Ethereum core developers.
    //
    // This configuration is intentionally not using keyed fields.
    // This configuration must *always* have all forks enabled, which
    // means that all fields must be set at all times. This forces
    // anyone adding flags to the config to also have to set these
    // fields.
    AllProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), new(EthashConfig), nil}
    TestChainConfig    = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
    TestRules          = TestChainConfig.Rules(new(big.Int))
)

// 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"` // Chain id 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 (fast sync aid)

    EIP155Block *big.Int `json:"eip155Block,omitempty"` // EIP155 HF block
    EIP158Block *big.Int `json:"eip158Block,omitempty"` // EIP158 HF block

    MetropolisBlock *big.Int `json:"metropolisBlock,omitempty"` // Metropolis switch block (nil = no fork, 0 = alraedy on homestead)

    // 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 Metropolis: %v Engine: %v}",
        c.ChainId,
        c.HomesteadBlock,
        c.DAOForkBlock,
        c.DAOForkSupport,
        c.EIP150Block,
        c.EIP155Block,
        c.EIP158Block,
        c.MetropolisBlock,
        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)
}

// IsDAO 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)
}

func (c *ChainConfig) IsEIP150(num *big.Int) bool {
    return isForked(c.EIP150Block, num)
}

func (c *ChainConfig) IsEIP155(num *big.Int) bool {
    return isForked(c.EIP155Block, num)
}

func (c *ChainConfig) IsEIP158(num *big.Int) bool {
    return isForked(c.EIP158Block, num)
}

func (c *ChainConfig) IsMetropolis(num *big.Int) bool {
    return isForked(c.MetropolisBlock, 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.IsEIP158(num):
        return GasTableEIP158
    case c.IsEIP150(num):
        return GasTableHomesteadGasRepriceFork
    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.MetropolisBlock, newcfg.MetropolisBlock, head) {
        return newCompatError("Metropolis fork block", c.MetropolisBlock, newcfg.MetropolisBlock)
    }
    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 syntatic 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
    IsMetropolis                              bool
}

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), IsMetropolis: c.IsMetropolis(num)}
}