path: root/core/genesis.go

// 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 (
	"bytes"
	"encoding/hex"
	"errors"
	"fmt"
	"math/big"
	"strings"

	"github.com/ava-labs/go-ethereum/common"
	"github.com/ava-labs/go-ethereum/common/hexutil"
	"github.com/ava-labs/go-ethereum/core/rawdb"
	"github.com/ava-labs/go-ethereum/core/state"
	"github.com/ava-labs/go-ethereum/ethdb"
	"github.com/ava-labs/go-ethereum/log"
	"github.com/ava-labs/go-ethereum/params"
	"github.com/ava-labs/go-ethereum/rlp"
	"github.com/ava-labs/go-ethereum/core"
)

var errGenesisNoConfig = errors.New("genesis has no chain configuration")

type Genesis = core.Genesis
type GenesisAlloc = core.GenesisAlloc
type GenesisAccount = core.GenesisAccount

// storageJSON represents a 256 bit byte array, but allows less than 256 bits when
// unmarshaling from hex.
type storageJSON common.Hash

func (h *storageJSON) UnmarshalText(text []byte) error {
	text = bytes.TrimPrefix(text, []byte("0x"))
	if len(text) > 64 {
		return fmt.Errorf("too many hex characters in storage key/value %q", text)
	}
	offset := len(h) - len(text)/2 // pad on the left
	if _, err := hex.Decode(h[offset:], text); err != nil {
		fmt.Println(err)
		return fmt.Errorf("invalid hex storage key/value %q", text)
	}
	return nil
}

func (h storageJSON) MarshalText() ([]byte, error) {
	return hexutil.Bytes(h[:]).MarshalText()
}

// 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.AllEthashProtocolChanges, common.Hash{}, errGenesisNoConfig
	}
	// Just commit the new block if there is no stored genesis block.
	stored := rawdb.ReadCanonicalHash(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)
		if err != nil {
			return genesis.Config, common.Hash{}, err
		}
		return genesis.Config, block.Hash(), nil
	}

	// We have the genesis block in database(perhaps in ancient database)
	// but the corresponding state is missing.
	header := rawdb.ReadHeader(db, stored, 0)
	if _, err := state.New(header.Root, state.NewDatabaseWithCache(db, 0)); err != nil {
		if genesis == nil {
			genesis = DefaultGenesisBlock()
		}
		// Ensure the stored genesis matches with the given one.
		hash := genesis.ToBlock(nil).Hash()
		if hash != stored {
			return genesis.Config, hash, &core.GenesisMismatchError{stored, hash}
		}
		block, err := genesis.Commit(db)
		if err != nil {
			return genesis.Config, hash, err
		}
		return genesis.Config, block.Hash(), nil
	}

	// Check whether the genesis block is already written.
	if genesis != nil {
		hash := genesis.ToBlock(nil).Hash()
		if hash != stored {
			return genesis.Config, hash, &core.GenesisMismatchError{stored, hash}
		}
	}

	// Get the existing chain configuration.
	newcfg := configOrDefault(genesis, stored)
	storedcfg := rawdb.ReadChainConfig(db, stored)
	if storedcfg == nil {
		log.Warn("Found genesis block without chain config")
		rawdb.WriteChainConfig(db, stored, newcfg)
		return newcfg, stored, nil
	}
	// 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 := rawdb.ReadHeaderNumber(db, rawdb.ReadHeadHeaderHash(db))
	if height == nil {
		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
	}
	rawdb.WriteChainConfig(db, stored, newcfg)
	return newcfg, stored, nil
}

func configOrDefault(g *Genesis, 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.AllEthashProtocolChanges
	}
}

// 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),
	}
}

// DefaultRinkebyGenesisBlock returns the Rinkeby network genesis block.
func DefaultRinkebyGenesisBlock() *Genesis {
	return &Genesis{
		Config:     params.RinkebyChainConfig,
		Timestamp:  1492009146,
		ExtraData:  hexutil.MustDecode("0x52657370656374206d7920617574686f7269746168207e452e436172746d616e42eb768f2244c8811c63729a21a3569731535f067ffc57839b00206d1ad20c69a1981b489f772031b279182d99e65703f0076e4812653aab85fca0f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
		GasLimit:   4700000,
		Difficulty: big.NewInt(1),
		Alloc:      decodePrealloc(rinkebyAllocData),
	}
}

// DefaultGoerliGenesisBlock returns the Görli network genesis block.
func DefaultGoerliGenesisBlock() *Genesis {
	return &Genesis{
		Config:     params.GoerliChainConfig,
		Timestamp:  1548854791,
		ExtraData:  hexutil.MustDecode("0x22466c6578692069732061207468696e6722202d204166726900000000000000e0a2bd4258d2768837baa26a28fe71dc079f84c70000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
		GasLimit:   10485760,
		Difficulty: big.NewInt(1),
		Alloc:      decodePrealloc(goerliAllocData),
	}
}

// DeveloperGenesisBlock returns the 'geth --dev' genesis block. Note, this must
// be seeded with the
func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
	// Override the default period to the user requested one
	config := *params.AllCliqueProtocolChanges
	config.Clique.Period = period

	// Assemble and return the genesis with the precompiles and faucet pre-funded
	return &Genesis{
		Config:     &config,
		ExtraData:  append(append(make([]byte, 32), faucet[:]...), make([]byte, 65)...),
		GasLimit:   6283185,
		Difficulty: big.NewInt(1),
		Alloc: map[common.Address]GenesisAccount{
			common.BytesToAddress([]byte{1}): {Balance: big.NewInt(1)}, // ECRecover
			common.BytesToAddress([]byte{2}): {Balance: big.NewInt(1)}, // SHA256
			common.BytesToAddress([]byte{3}): {Balance: big.NewInt(1)}, // RIPEMD
			common.BytesToAddress([]byte{4}): {Balance: big.NewInt(1)}, // Identity
			common.BytesToAddress([]byte{5}): {Balance: big.NewInt(1)}, // ModExp
			common.BytesToAddress([]byte{6}): {Balance: big.NewInt(1)}, // ECAdd
			common.BytesToAddress([]byte{7}): {Balance: big.NewInt(1)}, // ECScalarMul
			common.BytesToAddress([]byte{8}): {Balance: big.NewInt(1)}, // ECPairing
			faucet:                           {Balance: new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(9))},
		},
	}
}

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
}