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