37dd9086ec
This commit solves several issues concerning the genesis block: * Genesis/ChainConfig loading was handled by cmd/geth code. This left library users in the cold. They could specify a JSON-encoded string and overwrite the config, but didn't get any of the additional checks performed by geth. * Decoding and writing of genesis JSON was conflated in WriteGenesisBlock. This made it a lot harder to embed the genesis block into the forthcoming config file loader. This commit changes things so there is a single Genesis type that represents genesis blocks. All uses of Write*Genesis* are changed to use the new type instead. * If the chain config supplied by the user was incompatible with the current chain (i.e. the chain had already advanced beyond a scheduled fork), it got overwritten. This is not an issue in practice because previous forks have always had the highest total difficulty. It might matter in the future though. The new code reverts the local chain to the point of the fork when upgrading configuration. The change to genesis block data removes compression library dependencies from package core.
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" optional:"true"`
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Nonce uint64 `json:"nonce" optional:"true"`
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Timestamp uint64 `json:"timestamp" optional:"true"`
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ParentHash common.Hash `json:"parentHash" optional:"true"`
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ExtraData []byte `json:"extraData" optional:"true"`
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GasLimit uint64 `json:"gasLimit"`
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Difficulty *big.Int `json:"difficulty"`
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Mixhash common.Hash `json:"mixHash" optional:"true"`
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Coinbase common.Address `json:"coinbase" optional:"true"`
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Alloc GenesisAlloc `json:"alloc"`
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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" optional:"true"`
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Storage map[common.Hash]common.Hash `json:"storage" optional:"true"`
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Balance *big.Int `json:"balance"`
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Nonce uint64 `json:"nonce" optional:"true"`
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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("wrong genesis block in database (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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