// Copyright 2014 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 core
import (
"errors"
"fmt"
"math/big"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
)
//go:generate gencodec -type Genesis -field-override genesisSpecMarshaling -out gen_genesis.go
//go:generate gencodec -type GenesisAccount -field-override genesisAccountMarshaling -out gen_genesis_account.go
var errGenesisNoConfig = errors.New("genesis has no chain configuration")
// Genesis specifies the header fields, state of a genesis block. It also defines hard
// fork switch-over blocks through the chain configuration.
type Genesis struct {
Config *params.ChainConfig `json:"config"`
Nonce uint64 `json:"nonce"`
Timestamp uint64 `json:"timestamp"`
ParentHash common.Hash `json:"parentHash"`
ExtraData []byte `json:"extraData"`
GasLimit uint64 `json:"gasLimit" gencodec:"required"`
Difficulty *big.Int `json:"difficulty" gencodec:"required"`
Mixhash common.Hash `json:"mixHash"`
Coinbase common.Address `json:"coinbase"`
Alloc GenesisAlloc `json:"alloc" gencodec:"required"`
}
// GenesisAlloc specifies the initial state that is part of the genesis block.
type GenesisAlloc map[common.Address]GenesisAccount
// GenesisAccount is an account in the state of the genesis block.
type GenesisAccount struct {
Code []byte `json:"code,omitempty"`
Storage map[common.Hash]common.Hash `json:"storage,omitempty"`
Balance *big.Int `json:"balance" gencodec:"required"`
Nonce uint64 `json:"nonce,omitempty"`
}
// field type overrides for gencodec
type genesisSpecMarshaling struct {
Nonce math.HexOrDecimal64
Timestamp math.HexOrDecimal64
ExtraData hexutil.Bytes
GasLimit math.HexOrDecimal64
Difficulty *math.HexOrDecimal256
Alloc map[common.UnprefixedAddress]GenesisAccount
}
type genesisAccountMarshaling struct {
Code hexutil.Bytes
Balance *math.HexOrDecimal256
Nonce math.HexOrDecimal64
}
// GenesisMismatchError is raised when trying to overwrite an existing
// genesis block with an incompatible one.
type GenesisMismatchError struct {
Stored, New common.Hash
}
func (e *GenesisMismatchError) Error() string {
return fmt.Sprintf("wrong genesis block in database (have %x, new %x)", e.Stored[:8], e.New[:8])
}
// SetupGenesisBlock writes or updates the genesis block in db.
// The block that will be used is:
//
// genesis == nil genesis != nil
// +------------------------------------------
// db has no genesis | main-net default | genesis
// db has genesis | from DB | genesis (if compatible)
//
// The stored chain configuration will be updated if it is compatible (i.e. does not
// specify a fork block below the local head block). In case of a conflict, the
// error is a *params.ConfigCompatError and the new, unwritten config is returned.
//
// The returned chain configuration is never nil.
func SetupGenesisBlock(db ethdb.Database, genesis *Genesis) (*params.ChainConfig, common.Hash, error) {
if genesis != nil && genesis.Config == nil {
return params.AllProtocolChanges, common.Hash{}, errGenesisNoConfig
}
// Just commit the new block if there is no stored genesis block.
stored := GetCanonicalHash(db, 0)
if (stored == common.Hash{}) {
if genesis == nil {
log.Info("Writing default main-net genesis block")
genesis = DefaultGenesisBlock()
} else {
log.Info("Writing custom genesis block")
}
block, err := genesis.Commit(db)
return genesis.Config, block.Hash(), err
}
// Check whether the genesis block is already written.
if genesis != nil {
block, _ := genesis.ToBlock()
hash := block.Hash()
if hash != stored {
return genesis.Config, block.Hash(), &GenesisMismatchError{stored, hash}
}
}
// Get the existing chain configuration.
newcfg := genesis.configOrDefault(stored)
storedcfg, err := GetChainConfig(db, stored)
if err != nil {
if err == ChainConfigNotFoundErr {
// This case happens if a genesis write was interrupted.
log.Warn("Found genesis block without chain config")
err = WriteChainConfig(db, stored, newcfg)
}
return newcfg, stored, err
}
// Special case: don't change the existing config of a non-mainnet chain if no new
// config is supplied. These chains would get AllProtocolChanges (and a compat error)
// if we just continued here.
if genesis == nil && stored != params.MainNetGenesisHash {
return storedcfg, stored, nil
}
// Check config compatibility and write the config. Compatibility errors
// are returned to the caller unless we're already at block zero.
height := GetBlockNumber(db, GetHeadHeaderHash(db))
if height == missingNumber {
return newcfg, stored, fmt.Errorf("missing block number for head header hash")
}
compatErr := storedcfg.CheckCompatible(newcfg, height)
if compatErr != nil && height != 0 && compatErr.RewindTo != 0 {
return newcfg, stored, compatErr
}
return newcfg, stored, WriteChainConfig(db, stored, newcfg)
}
func (g *Genesis) configOrDefault(ghash common.Hash) *params.ChainConfig {
switch {
case g != nil:
return g.Config
case ghash == params.MainNetGenesisHash:
return params.MainnetChainConfig
case ghash == params.TestNetGenesisHash:
return params.TestnetChainConfig
default:
return params.AllProtocolChanges
}
}
// ToBlock creates the block and state of a genesis specification.
func (g *Genesis) ToBlock() (*types.Block, *state.StateDB) {
db, _ := ethdb.NewMemDatabase()
statedb, _ := state.New(common.Hash{}, db)
for addr, account := range g.Alloc {
statedb.AddBalance(addr, account.Balance)
statedb.SetCode(addr, account.Code)
statedb.SetNonce(addr, account.Nonce)
for key, value := range account.Storage {
statedb.SetState(addr, key, value)
}
}
root := statedb.IntermediateRoot(false)
head := &types.Header{
Nonce: types.EncodeNonce(g.Nonce),
Time: new(big.Int).SetUint64(g.Timestamp),
ParentHash: g.ParentHash,
Extra: g.ExtraData,
GasLimit: new(big.Int).SetUint64(g.GasLimit),
Difficulty: g.Difficulty,
MixDigest: g.Mixhash,
Coinbase: g.Coinbase,
Root: root,
}
if g.GasLimit == 0 {
head.GasLimit = params.GenesisGasLimit
}
if g.Difficulty == nil {
head.Difficulty = params.GenesisDifficulty
}
return types.NewBlock(head, nil, nil, nil), statedb
}
// Commit writes the block and state of a genesis specification to the database.
// The block is committed as the canonical head block.
func (g *Genesis) Commit(db ethdb.Database) (*types.Block, error) {
block, statedb := g.ToBlock()
if _, err := statedb.CommitTo(db, false); err != nil {
return nil, fmt.Errorf("cannot write state: %v", err)
}
if err := WriteTd(db, block.Hash(), block.NumberU64(), g.Difficulty); err != nil {
return nil, err
}
if err := WriteBlock(db, block); err != nil {
return nil, err
}
if err := WriteBlockReceipts(db, block.Hash(), block.NumberU64(), nil); err != nil {
return nil, err
}
if err := WriteCanonicalHash(db, block.Hash(), block.NumberU64()); err != nil {
return nil, err
}
if err := WriteHeadBlockHash(db, block.Hash()); err != nil {
return nil, err
}
if err := WriteHeadHeaderHash(db, block.Hash()); err != nil {
return nil, err
}
config := g.Config
if config == nil {
config = params.AllProtocolChanges
}
return block, WriteChainConfig(db, block.Hash(), config)
}
// MustCommit writes the genesis block and state to db, panicking on error.
// The block is committed as the canonical head block.
func (g *Genesis) MustCommit(db ethdb.Database) *types.Block {
block, err := g.Commit(db)
if err != nil {
panic(err)
}
return block
}
// GenesisBlockForTesting creates and writes a block in which addr has the given wei balance.
func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big.Int) *types.Block {
g := Genesis{Alloc: GenesisAlloc{addr: {Balance: balance}}}
return g.MustCommit(db)
}
// DefaultGenesisBlock returns the Ethereum main net genesis block.
func DefaultGenesisBlock() *Genesis {
return &Genesis{
Config: params.MainnetChainConfig,
Nonce: 66,
ExtraData: hexutil.MustDecode("0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"),
GasLimit: 5000,
Difficulty: big.NewInt(17179869184),
Alloc: decodePrealloc(mainnetAllocData),
}
}
// DefaultTestnetGenesisBlock returns the Ropsten network genesis block.
func DefaultTestnetGenesisBlock() *Genesis {
return &Genesis{
Config: params.TestnetChainConfig,
Nonce: 66,
ExtraData: hexutil.MustDecode("0x3535353535353535353535353535353535353535353535353535353535353535"),
GasLimit: 16777216,
Difficulty: big.NewInt(1048576),
Alloc: decodePrealloc(testnetAllocData),
}
}
// DevGenesisBlock returns the 'geth --dev' genesis block.
func DevGenesisBlock() *Genesis {
return &Genesis{
Config: params.AllProtocolChanges,
Nonce: 42,
GasLimit: 4712388,
Difficulty: big.NewInt(131072),
Alloc: decodePrealloc(devAllocData),
}
}
func decodePrealloc(data string) GenesisAlloc {
var p []struct{ Addr, Balance *big.Int }
if err := rlp.NewStream(strings.NewReader(data), 0).Decode(&p); err != nil {
panic(err)
}
ga := make(GenesisAlloc, len(p))
for _, account := range p {
ga[common.BigToAddress(account.Addr)] = GenesisAccount{Balance: account.Balance}
}
return ga
}
