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// Copyright 2017 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"bytes"
"fmt"
"math/big"
"math/rand"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
)
// makeGenesis creates a new genesis struct based on some user input.
func (w *wizard) makeGenesis() {
// Construct a default genesis block
genesis := &core.Genesis{
Timestamp: uint64(time.Now().Unix()),
GasLimit: 4700000,
Difficulty: big.NewInt(1048576),
Alloc: make(core.GenesisAlloc),
Config: ¶ms.ChainConfig{
HomesteadBlock: big.NewInt(1),
EIP150Block: big.NewInt(2),
EIP155Block: big.NewInt(3),
EIP158Block: big.NewInt(3),
ByzantiumBlock: big.NewInt(4),
},
}
// Figure out which consensus engine to choose
fmt.Println()
fmt.Println("Which consensus engine to use? (default = clique)")
fmt.Println(" 1. Ethash - proof-of-work")
fmt.Println(" 2. Clique - proof-of-authority")
choice := w.read()
switch {
case choice == "1":
// In case of ethash, we're pretty much done
genesis.Config.Ethash = new(params.EthashConfig)
genesis.ExtraData = make([]byte, 32)
case choice == "" || choice == "2":
// In the case of clique, configure the consensus parameters
genesis.Difficulty = big.NewInt(1)
genesis.Config.Clique = ¶ms.CliqueConfig{
Period: 15,
Epoch: 30000,
}
fmt.Println()
fmt.Println("How many seconds should blocks take? (default = 15)")
genesis.Config.Clique.Period = uint64(w.readDefaultInt(15))
// We also need the initial list of signers
fmt.Println()
fmt.Println("Which accounts are allowed to seal? (mandatory at least one)")
var signers []common.Address
for {
if address := w.readAddress(); address != nil {
signers = append(signers, *address)
continue
}
if len(signers) > 0 {
break
}
}
// Sort the signers and embed into the extra-data section
for i := 0; i < len(signers); i++ {
for j := i + 1; j < len(signers); j++ {
if bytes.Compare(signers[i][:], signers[j][:]) > 0 {
signers[i], signers[j] = signers[j], signers[i]
}
}
}
genesis.ExtraData = make([]byte, 32+len(signers)*common.AddressLength+65)
for i, signer := range signers {
copy(genesis.ExtraData[32+i*common.AddressLength:], signer[:])
}
default:
log.Crit("Invalid consensus engine choice", "choice", choice)
}
// Consensus all set, just ask for initial funds and go
fmt.Println()
fmt.Println("Which accounts should be pre-funded? (advisable at least one)")
for {
// Read the address of the account to fund
if address := w.readAddress(); address != nil {
genesis.Alloc[*address] = core.GenesisAccount{
Balance: new(big.Int).Lsh(big.NewInt(1), 256-7), // 2^256 / 128 (allow many pre-funds without balance overflows)
}
continue
}
break
}
// Add a batch of precompile balances to avoid them getting deleted
for i := int64(0); i < 256; i++ {
genesis.Alloc[common.BigToAddress(big.NewInt(i))] = core.GenesisAccount{Balance: big.NewInt(1)}
}
fmt.Println()
// Query the user for some custom extras
fmt.Println()
fmt.Println("Specify your chain/network ID if you want an explicit one (default = random)")
genesis.Config.ChainId = new(big.Int).SetUint64(uint64(w.readDefaultInt(rand.Intn(65536))))
fmt.Println()
fmt.Println("Anything fun to embed into the genesis block? (max 32 bytes)")
extra := w.read()
if len(extra) > 32 {
extra = extra[:32]
}
genesis.ExtraData = append([]byte(extra), genesis.ExtraData[len(extra):]...)
// All done, store the genesis and flush to disk
w.conf.genesis = genesis
}
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