303 lines
10 KiB
Go
303 lines
10 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"errors"
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"fmt"
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"math/big"
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"strings"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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)
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//go:generate gencodec -type Genesis -field-override genesisSpecMarshaling -out gen_genesis.go
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//go:generate gencodec -type GenesisAccount -field-override genesisAccountMarshaling -out gen_genesis_account.go
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var errGenesisNoConfig = errors.New("genesis has no chain configuration")
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// Genesis specifies the header fields, state of a genesis block. It also defines hard
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// fork switch-over blocks through the chain configuration.
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type Genesis struct {
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Config *params.ChainConfig `json:"config"`
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Nonce uint64 `json:"nonce"`
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Timestamp uint64 `json:"timestamp"`
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ParentHash common.Hash `json:"parentHash"`
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ExtraData []byte `json:"extraData"`
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GasLimit uint64 `json:"gasLimit" gencodec:"required"`
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Difficulty *big.Int `json:"difficulty" gencodec:"required"`
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Mixhash common.Hash `json:"mixHash"`
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Coinbase common.Address `json:"coinbase"`
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Alloc GenesisAlloc `json:"alloc" gencodec:"required"`
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}
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// GenesisAlloc specifies the initial state that is part of the genesis block.
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type GenesisAlloc map[common.Address]GenesisAccount
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// GenesisAccount is an account in the state of the genesis block.
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type GenesisAccount struct {
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Code []byte `json:"code,omitempty"`
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Storage map[common.Hash]common.Hash `json:"storage,omitempty"`
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Balance *big.Int `json:"balance" gencodec:"required"`
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Nonce uint64 `json:"nonce,omitempty"`
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}
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// field type overrides for gencodec
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type genesisSpecMarshaling struct {
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Nonce math.HexOrDecimal64
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Timestamp math.HexOrDecimal64
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ExtraData hexutil.Bytes
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GasLimit math.HexOrDecimal64
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Difficulty *math.HexOrDecimal256
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Alloc map[common.UnprefixedAddress]GenesisAccount
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}
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type genesisAccountMarshaling struct {
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Code hexutil.Bytes
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Balance *math.HexOrDecimal256
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Nonce math.HexOrDecimal64
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}
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// GenesisMismatchError is raised when trying to overwrite an existing
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// genesis block with an incompatible one.
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type GenesisMismatchError struct {
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Stored, New common.Hash
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}
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func (e *GenesisMismatchError) Error() string {
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return fmt.Sprintf("database already contains an incompatible genesis block (have %x, new %x)", e.Stored[:8], e.New[:8])
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}
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// SetupGenesisBlock writes or updates the genesis block in db.
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// The block that will be used is:
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//
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// genesis == nil genesis != nil
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// +------------------------------------------
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// db has no genesis | main-net default | genesis
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// db has genesis | from DB | genesis (if compatible)
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//
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// The stored chain configuration will be updated if it is compatible (i.e. does not
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// specify a fork block below the local head block). In case of a conflict, the
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// error is a *params.ConfigCompatError and the new, unwritten config is returned.
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//
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// The returned chain configuration is never nil.
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func SetupGenesisBlock(db ethdb.Database, genesis *Genesis) (*params.ChainConfig, common.Hash, error) {
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if genesis != nil && genesis.Config == nil {
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return params.AllProtocolChanges, common.Hash{}, errGenesisNoConfig
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}
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// Just commit the new block if there is no stored genesis block.
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stored := GetCanonicalHash(db, 0)
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if (stored == common.Hash{}) {
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if genesis == nil {
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log.Info("Writing default main-net genesis block")
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genesis = DefaultGenesisBlock()
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} else {
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log.Info("Writing custom genesis block")
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}
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block, err := genesis.Commit(db)
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return genesis.Config, block.Hash(), err
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}
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// Check whether the genesis block is already written.
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if genesis != nil {
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block, _ := genesis.ToBlock()
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hash := block.Hash()
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if hash != stored {
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return genesis.Config, block.Hash(), &GenesisMismatchError{stored, hash}
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}
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}
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// Get the existing chain configuration.
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newcfg := genesis.configOrDefault(stored)
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storedcfg, err := GetChainConfig(db, stored)
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if err != nil {
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if err == ChainConfigNotFoundErr {
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// This case happens if a genesis write was interrupted.
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log.Warn("Found genesis block without chain config")
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err = WriteChainConfig(db, stored, newcfg)
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}
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return newcfg, stored, err
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}
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// Special case: don't change the existing config of a non-mainnet chain if no new
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// config is supplied. These chains would get AllProtocolChanges (and a compat error)
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// if we just continued here.
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if genesis == nil && stored != params.MainNetGenesisHash {
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return storedcfg, stored, nil
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}
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// Check config compatibility and write the config. Compatibility errors
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// are returned to the caller unless we're already at block zero.
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height := GetBlockNumber(db, GetHeadHeaderHash(db))
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if height == missingNumber {
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return newcfg, stored, fmt.Errorf("missing block number for head header hash")
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}
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compatErr := storedcfg.CheckCompatible(newcfg, height)
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if compatErr != nil && height != 0 && compatErr.RewindTo != 0 {
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return newcfg, stored, compatErr
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}
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return newcfg, stored, WriteChainConfig(db, stored, newcfg)
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}
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func (g *Genesis) configOrDefault(ghash common.Hash) *params.ChainConfig {
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switch {
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case g != nil:
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return g.Config
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case ghash == params.MainNetGenesisHash:
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return params.MainnetChainConfig
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case ghash == params.TestNetGenesisHash:
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return params.TestnetChainConfig
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default:
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return params.AllProtocolChanges
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}
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}
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// ToBlock creates the block and state of a genesis specification.
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func (g *Genesis) ToBlock() (*types.Block, *state.StateDB) {
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db, _ := ethdb.NewMemDatabase()
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statedb, _ := state.New(common.Hash{}, db)
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for addr, account := range g.Alloc {
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statedb.AddBalance(addr, account.Balance)
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statedb.SetCode(addr, account.Code)
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statedb.SetNonce(addr, account.Nonce)
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for key, value := range account.Storage {
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statedb.SetState(addr, key, value)
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}
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}
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root := statedb.IntermediateRoot(false)
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head := &types.Header{
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Nonce: types.EncodeNonce(g.Nonce),
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Time: new(big.Int).SetUint64(g.Timestamp),
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ParentHash: g.ParentHash,
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Extra: g.ExtraData,
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GasLimit: new(big.Int).SetUint64(g.GasLimit),
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Difficulty: g.Difficulty,
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MixDigest: g.Mixhash,
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Coinbase: g.Coinbase,
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Root: root,
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}
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if g.GasLimit == 0 {
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head.GasLimit = params.GenesisGasLimit
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}
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if g.Difficulty == nil {
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head.Difficulty = params.GenesisDifficulty
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}
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return types.NewBlock(head, nil, nil, nil), statedb
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}
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// Commit writes the block and state of a genesis specification to the database.
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// The block is committed as the canonical head block.
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func (g *Genesis) Commit(db ethdb.Database) (*types.Block, error) {
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block, statedb := g.ToBlock()
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if _, err := statedb.CommitTo(db, false); err != nil {
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return nil, fmt.Errorf("cannot write state: %v", err)
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}
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if err := WriteTd(db, block.Hash(), block.NumberU64(), g.Difficulty); err != nil {
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return nil, err
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}
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if err := WriteBlock(db, block); err != nil {
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return nil, err
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}
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if err := WriteBlockReceipts(db, block.Hash(), block.NumberU64(), nil); err != nil {
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return nil, err
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}
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if err := WriteCanonicalHash(db, block.Hash(), block.NumberU64()); err != nil {
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return nil, err
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}
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if err := WriteHeadBlockHash(db, block.Hash()); err != nil {
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return nil, err
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}
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if err := WriteHeadHeaderHash(db, block.Hash()); err != nil {
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return nil, err
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}
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config := g.Config
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if config == nil {
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config = params.AllProtocolChanges
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}
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return block, WriteChainConfig(db, block.Hash(), config)
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}
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// MustCommit writes the genesis block and state to db, panicking on error.
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// The block is committed as the canonical head block.
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func (g *Genesis) MustCommit(db ethdb.Database) *types.Block {
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block, err := g.Commit(db)
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if err != nil {
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panic(err)
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}
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return block
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}
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// GenesisBlockForTesting creates and writes a block in which addr has the given wei balance.
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func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big.Int) *types.Block {
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g := Genesis{Alloc: GenesisAlloc{addr: {Balance: balance}}}
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return g.MustCommit(db)
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}
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// DefaultGenesisBlock returns the Ethereum main net genesis block.
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func DefaultGenesisBlock() *Genesis {
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return &Genesis{
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Config: params.MainnetChainConfig,
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Nonce: 66,
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ExtraData: hexutil.MustDecode("0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"),
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GasLimit: 5000,
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Difficulty: big.NewInt(17179869184),
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Alloc: decodePrealloc(mainnetAllocData),
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}
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}
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// DefaultTestnetGenesisBlock returns the Ropsten network genesis block.
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func DefaultTestnetGenesisBlock() *Genesis {
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return &Genesis{
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Config: params.TestnetChainConfig,
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Nonce: 66,
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ExtraData: hexutil.MustDecode("0x3535353535353535353535353535353535353535353535353535353535353535"),
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GasLimit: 16777216,
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Difficulty: big.NewInt(1048576),
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Alloc: decodePrealloc(testnetAllocData),
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}
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}
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// DevGenesisBlock returns the 'geth --dev' genesis block.
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func DevGenesisBlock() *Genesis {
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return &Genesis{
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Config: params.AllProtocolChanges,
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Nonce: 42,
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GasLimit: 4712388,
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Difficulty: big.NewInt(131072),
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Alloc: decodePrealloc(devAllocData),
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}
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}
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func decodePrealloc(data string) GenesisAlloc {
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var p []struct{ Addr, Balance *big.Int }
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if err := rlp.NewStream(strings.NewReader(data), 0).Decode(&p); err != nil {
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panic(err)
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}
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ga := make(GenesisAlloc, len(p))
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for _, account := range p {
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ga[common.BigToAddress(account.Addr)] = GenesisAccount{Balance: account.Balance}
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}
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return ga
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}
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