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validators.go
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validators.go
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package main
import (
"bufio"
"bytes"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"sync/atomic"
"github.com/tyler-smith/go-bip39"
"golang.org/x/sync/errgroup"
"gopkg.in/yaml.v3"
blshd "github.com/protolambda/bls12-381-hd"
blsu "github.com/protolambda/bls12-381-util"
"github.com/protolambda/zrnt/eth2/beacon/common"
"github.com/protolambda/zrnt/eth2/beacon/phase0"
)
func loadValidatorKeys(spec *common.Spec, mnemonicsConfigPath string, validatorsListPath string, tranchesDir string, ethWithdrawalAddress common.Eth1Address) ([]phase0.KickstartValidatorData, error) {
validators := []phase0.KickstartValidatorData{}
if mnemonicsConfigPath != "" {
val, err := generateValidatorKeysByMnemonic(spec, mnemonicsConfigPath, tranchesDir, ethWithdrawalAddress)
if err != nil {
fmt.Printf("error loading validators from mnemonic yaml (%s): %s\n", mnemonicsConfigPath, err)
} else {
fmt.Printf("generated %d validators from mnemonic yaml (%s)\n", len(val), mnemonicsConfigPath)
validators = append(validators, val...)
}
}
if validatorsListPath != "" {
val, err := loadValidatorsFromFile(spec, validatorsListPath)
if err != nil {
fmt.Printf("error loading validators from validators list (%s): %s\n", validatorsListPath, err)
} else {
fmt.Printf("loaded %d validators from validators list (%s)\n", len(val), validatorsListPath)
validators = append(validators, val...)
}
}
return validators, nil
}
func generateValidatorKeysByMnemonic(spec *common.Spec, mnemonicsConfigPath string, tranchesDir string, ethWithdrawalAddress common.Eth1Address) ([]phase0.KickstartValidatorData, error) {
mnemonics, err := loadMnemonics(mnemonicsConfigPath)
if err != nil {
return nil, err
}
//var validators []phase0.KickstartValidatorData
var valCount uint64 = 0
for _, mnemonicSrc := range mnemonics {
valCount += mnemonicSrc.Count
}
validators := make([]phase0.KickstartValidatorData, valCount)
offset := uint64(0)
for m, mnemonicSrc := range mnemonics {
var g errgroup.Group
g.SetLimit(10_000) // when generating large states, do squeeze processing, but do not go out of memory
var prog int32
fmt.Printf("processing mnemonic %d, for %d validators\n", m, mnemonicSrc.Count)
seed, err := seedFromMnemonic(mnemonicSrc.Mnemonic)
if err != nil {
return nil, fmt.Errorf("mnemonic %d is bad", m)
}
pubs := make([]string, mnemonicSrc.Count)
for i := uint64(0); i < mnemonicSrc.Count; i++ {
valIndex := offset + i
idx := i
g.Go(func() error {
signingSK, err := blshd.SecretKeyFromHD(seed, validatorKeyName(idx))
if err != nil {
return err
}
var blsSK blsu.SecretKey
if err := blsSK.Deserialize(signingSK); err != nil {
return fmt.Errorf("failed to decode derived secret key: %w", err)
}
pub, err := blsu.SkToPk(&blsSK)
if err != nil {
return fmt.Errorf("failed to compute pubkey: %w", err)
}
// BLS signing key
var data phase0.KickstartValidatorData
data.Pubkey = pub.Serialize()
pubs[idx] = data.Pubkey.String()
if ethWithdrawalAddress == (common.Eth1Address{}) {
// BLS withdrawal credentials
withdrawalSK, err := blshd.SecretKeyFromHD(seed, withdrawalKeyName(idx))
if err != nil {
return err
}
var withdrawalBlsSK blsu.SecretKey
if err := withdrawalBlsSK.Deserialize(withdrawalSK); err != nil {
return fmt.Errorf("failed to decode derived secret key: %w", err)
}
withdrawalPub, err := blsu.SkToPk(&withdrawalBlsSK)
if err != nil {
return fmt.Errorf("failed to compute pubkey: %w", err)
}
withdrawalPubBytes := withdrawalPub.Serialize()
h := sha256.New()
h.Write(withdrawalPubBytes[:])
copy(data.WithdrawalCredentials[:], h.Sum(nil))
data.WithdrawalCredentials[0] = common.BLS_WITHDRAWAL_PREFIX
} else {
// spec:
// The withdrawal_credentials field must be such that:
// withdrawal_credentials[:1] == ETH1_ADDRESS_WITHDRAWAL_PREFIX
// withdrawal_credentials[1:12] == b'\x00' * 11
// withdrawal_credentials[12:] == eth1_withdrawal_address
data.WithdrawalCredentials[0] = common.ETH1_ADDRESS_WITHDRAWAL_PREFIX
copy(data.WithdrawalCredentials[12:], ethWithdrawalAddress[:])
}
// Max effective balance by default for activation
data.Balance = spec.MAX_EFFECTIVE_BALANCE
validators[valIndex] = data
count := atomic.AddInt32(&prog, 1)
if count%100 == 0 {
fmt.Printf("...validator %d/%d\n", prog, mnemonicSrc.Count)
}
return nil
})
}
offset += mnemonicSrc.Count
if err := g.Wait(); err != nil {
return nil, err
}
fmt.Println("Writing pubkeys list file...")
if err := outputPubkeys(filepath.Join(tranchesDir, fmt.Sprintf("tranche_%04d.txt", m)), pubs); err != nil {
return nil, err
}
}
return validators, nil
}
func validatorKeyName(i uint64) string {
return fmt.Sprintf("m/12381/3600/%d/0/0", i)
}
func withdrawalKeyName(i uint64) string {
return fmt.Sprintf("m/12381/3600/%d/0", i)
}
func seedFromMnemonic(mnemonic string) (seed []byte, err error) {
mnemonic = strings.TrimSpace(mnemonic)
if !bip39.IsMnemonicValid(mnemonic) {
return nil, errors.New("mnemonic is not valid")
}
return bip39.NewSeed(mnemonic, ""), nil
}
func outputPubkeys(outPath string, data []string) error {
f, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY, 0777)
if err != nil {
return err
}
defer f.Close()
for _, p := range data {
if _, err := f.WriteString(p + "\n"); err != nil {
return err
}
}
return nil
}
type MnemonicSrc struct {
Mnemonic string `yaml:"mnemonic"`
Count uint64 `yaml:"count"`
}
func loadMnemonics(srcPath string) ([]MnemonicSrc, error) {
f, err := os.Open(srcPath)
if err != nil {
return nil, err
}
defer f.Close()
var data []MnemonicSrc
dec := yaml.NewDecoder(f)
if err := dec.Decode(&data); err != nil {
return nil, err
}
return data, nil
}
func loadValidatorsFromFile(spec *common.Spec, validatorsConfigPath string) ([]phase0.KickstartValidatorData, error) {
validatorsFile, err := os.Open(validatorsConfigPath)
if err != nil {
return nil, err
}
defer validatorsFile.Close()
validators := make([]phase0.KickstartValidatorData, 0)
pubkeyMap := map[string]int{}
scanner := bufio.NewScanner(validatorsFile)
lineNum := 0
for scanner.Scan() {
line := scanner.Text()
lineNum++
if line == "" || strings.HasPrefix(line, "#") {
continue
}
lineParts := strings.Split(line, ":")
validatorEntry := phase0.KickstartValidatorData{}
// Public key
pubKey, err := hex.DecodeString(strings.Replace(lineParts[0], "0x", "", -1))
if err != nil {
return nil, err
}
if len(pubKey) != 48 {
return nil, errors.New(fmt.Sprintf("invalid pubkey (invalid length) on line %v", lineNum))
}
if pubkeyMap[string(pubKey)] != 0 {
return nil, errors.New(fmt.Sprintf("duplicate pubkey on line %v and %v", pubkeyMap[string(pubKey)], lineNum))
}
pubkeyMap[string(pubKey)] = lineNum
copy(validatorEntry.Pubkey[:], pubKey)
// Withdrawal credentials
withdrawalCred, err := hex.DecodeString(strings.Replace(lineParts[1], "0x", "", -1))
if err != nil {
return nil, err
}
if len(withdrawalCred) != 32 {
return nil, errors.New(fmt.Sprintf("invalid withdrawal credentials (invalid length) on line %v", lineNum))
}
switch withdrawalCred[0] {
case 0x00:
break
case 0x01:
if !bytes.Equal(withdrawalCred[1:12], []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}) {
return nil, errors.New(fmt.Sprintf("invalid withdrawal credentials (invalid 0x01 cred) on line %v", lineNum))
}
break
default:
return nil, errors.New(fmt.Sprintf("invalid withdrawal credentials (invalid type) on line %v", lineNum))
}
copy(validatorEntry.WithdrawalCredentials[:], withdrawalCred)
// Validator balance
if len(lineParts) > 2 {
balance, err := strconv.ParseUint(string(lineParts[2]), 10, 64)
if err != nil {
return nil, err
}
validatorEntry.Balance = common.Gwei(balance)
} else {
validatorEntry.Balance = spec.MAX_EFFECTIVE_BALANCE
}
validators = append(validators, validatorEntry)
}
return validators, nil
}