// Copyright 2017 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/>.

//go:build none

// +build none

/*

The mkalloc tool creates the genesis allocation constants in genesis_alloc.go

It outputs a const declaration that contains an RLP-encoded list of (address, balance) tuples.

go run mkalloc.go genesis.json

*/

package main

import (

"encoding/json"

"fmt"

"math/big"

"os"

"sort"

"strconv"

"github.com/ethereum/go-ethereum/core"

"github.com/ethereum/go-ethereum/rlp"

)

type allocItem struct{ Addr, Balance *big.Int }

type allocList []allocItem

func (a allocList) Len() int { return len(a) }

func (a allocList) Less(i, j int) bool { return a[i].Addr.Cmp(a[j].Addr) < 0 }

func (a allocList) Swap(i, j int) { a[i], a[j] = a[j], a[i] }

func makelist(g *core.Genesis) allocList {

a := make(allocList, 0, len(g.Alloc))

for addr, account := range g.Alloc {

if len(account.Storage) > 0 || len(account.Code) > 0 || account.Nonce != 0 {

panic(fmt.Sprintf("can't encode account %x", addr))

}

bigAddr := new(big.Int).SetBytes(addr.Bytes())

a = append(a, allocItem{bigAddr, account.Balance})

}

sort.Sort(a)

return a

}

func makealloc(g *core.Genesis) string {

a := makelist(g)

data, err := rlp.EncodeToBytes(a)

if err != nil {

panic(err)

}

return strconv.QuoteToASCII(string(data))

}

func main() {

if len(os.Args) != 2 {

fmt.Fprintln(os.Stderr, "Usage: mkalloc genesis.json")

os.Exit(1)

}

g := new(core.Genesis)

file, err := os.Open(os.Args[1])

if err != nil {

panic(err)

}

if err := json.NewDecoder(file).Decode(g); err != nil {

panic(err)

}

fmt.Println("const allocData =", makealloc(g))

}