altair.go

package main

import (
	"bufio"
	"context"
	"fmt"
	"github.com/protolambda/zcli/util"
	"github.com/protolambda/zrnt/eth2/beacon/altair"
	"github.com/protolambda/zrnt/eth2/beacon/common"
	"github.com/protolambda/ztyp/codec"
	"os"
	"time"
)

type AltairGenesisCmd struct {
	util.SpecOptions     `ask:"."`
	Eth1BlockHash        common.Root      `ask:"--eth1-block" help:"Eth1 block hash to put into state"`
	Eth1BlockTimestamp   common.Timestamp `ask:"--timestamp" help:"Eth1 block timestamp"`
	MnemonicsSrcFilePath string           `ask:"--mnemonics" help:"File with YAML of key sources"`
	StateOutputPath      string           `ask:"--state-output" help:"Output path for state file"`
	TranchesDir          string           `ask:"--tranches-dir" help:"Directory to dump lists of pubkeys of each tranche in"`
}

func (g *AltairGenesisCmd) Help() string {
	return "Create genesis state for altair beacon chain"
}

func (g *AltairGenesisCmd) Default() {
	g.SpecOptions.Default()
	g.Eth1BlockHash = common.Root{}
	g.Eth1BlockTimestamp = common.Timestamp(time.Now().Unix())
	g.MnemonicsSrcFilePath = "mnemonics.yaml"
	g.StateOutputPath = "genesis.ssz"
	g.TranchesDir = "tranches"
}

func (g *AltairGenesisCmd) Run(ctx context.Context, args ...string) error {
	spec, err := g.SpecOptions.Spec()
	if err != nil {
		return err
	}

	if err := os.MkdirAll(g.TranchesDir, 0777); err != nil {
		return err
	}

	validators, err := loadValidatorKeys(spec, g.MnemonicsSrcFilePath, g.TranchesDir)
	if err != nil {
		return err
	}

	if uint64(len(validators)) < spec.MIN_GENESIS_ACTIVE_VALIDATOR_COUNT {
		fmt.Printf("WARNING: not enough validators for genesis. Key sources sum up to %d total. But need %d.\n", len(validators), spec.MIN_GENESIS_ACTIVE_VALIDATOR_COUNT)
	}

	state := altair.NewBeaconStateView(spec)
	if err := setupState(spec, state, g.Eth1BlockTimestamp, g.Eth1BlockHash, validators); err != nil {
		return err
	}

	t, err := state.GenesisTime()
	if err != nil {
		return err
	}
	fmt.Printf("genesis at %d + %d = %d  (%s)\n", g.Eth1BlockTimestamp, spec.GENESIS_DELAY, t, time.Unix(int64(t), 0).String())

	fmt.Println("done preparing state, serializing SSZ now...")
	f, err := os.OpenFile(g.StateOutputPath, os.O_CREATE|os.O_WRONLY, 0777)
	if err != nil {
		return err
	}
	defer f.Close()
	buf := bufio.NewWriter(f)
	defer buf.Flush()
	w := codec.NewEncodingWriter(f)
	if err := state.Serialize(w); err != nil {
		return err
	}
	fmt.Println("done!")
	return nil
}