1// Copyright 2017 The go-ethereum Authors
2// This file is part of the go-ethereum library.
3//
4// The go-ethereum library is free software: you can redistribute it and/or modify
5// it under the terms of the GNU Lesser General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// The go-ethereum library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU Lesser General Public License for more details.
13//
14// You should have received a copy of the GNU Lesser General Public License
15// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
16
17//go:build none
18// +build none
19
20/*
21
22   The mkalloc tool creates the genesis allocation constants in genesis_alloc.go
23   It outputs a const declaration that contains an RLP-encoded list of (address, balance) tuples.
24
25       go run mkalloc.go genesis.json
26
27*/
28package main
29
30import (
31	"encoding/json"
32	"fmt"
33	"math/big"
34	"os"
35	"sort"
36	"strconv"
37
38	"github.com/ethereum/go-ethereum/core"
39	"github.com/ethereum/go-ethereum/rlp"
40)
41
42type allocItem struct{ Addr, Balance *big.Int }
43
44type allocList []allocItem
45
46func (a allocList) Len() int           { return len(a) }
47func (a allocList) Less(i, j int) bool { return a[i].Addr.Cmp(a[j].Addr) < 0 }
48func (a allocList) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
49
50func makelist(g *core.Genesis) allocList {
51	a := make(allocList, 0, len(g.Alloc))
52	for addr, account := range g.Alloc {
53		if len(account.Storage) > 0 || len(account.Code) > 0 || account.Nonce != 0 {
54			panic(fmt.Sprintf("can't encode account %x", addr))
55		}
56		bigAddr := new(big.Int).SetBytes(addr.Bytes())
57		a = append(a, allocItem{bigAddr, account.Balance})
58	}
59	sort.Sort(a)
60	return a
61}
62
63func makealloc(g *core.Genesis) string {
64	a := makelist(g)
65	data, err := rlp.EncodeToBytes(a)
66	if err != nil {
67		panic(err)
68	}
69	return strconv.QuoteToASCII(string(data))
70}
71
72func main() {
73	if len(os.Args) != 2 {
74		fmt.Fprintln(os.Stderr, "Usage: mkalloc genesis.json")
75		os.Exit(1)
76	}
77
78	g := new(core.Genesis)
79	file, err := os.Open(os.Args[1])
80	if err != nil {
81		panic(err)
82	}
83	if err := json.NewDecoder(file).Decode(g); err != nil {
84		panic(err)
85	}
86	fmt.Println("const allocData =", makealloc(g))
87}
88