path: root/core/genesis.go

// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// go-ethereum 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/>.

package core

import (
    "encoding/json"
    "fmt"
    "io"
    "io/ioutil"
    "math/big"
    "strings"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/params"
)

// WriteGenesisBlock writes the genesis block to the database as block number 0
func WriteGenesisBlock(stateDb, blockDb common.Database, reader io.Reader) (*types.Block, error) {
    contents, err := ioutil.ReadAll(reader)
    if err != nil {
        return nil, err
    }

    var genesis struct {
        Nonce      string
        Timestamp  string
        ParentHash string
        ExtraData  string
        GasLimit   string
        Difficulty string
        Mixhash    string
        Coinbase   string
        Alloc      map[string]struct {
            Code    string
            Storage map[string]string
            Balance string
        }
    }

    if err := json.Unmarshal(contents, &genesis); err != nil {
        return nil, err
    }

    statedb := state.New(common.Hash{}, stateDb)
    for addr, account := range genesis.Alloc {
        address := common.HexToAddress(addr)
        statedb.AddBalance(address, common.String2Big(account.Balance))
        statedb.SetCode(address, common.Hex2Bytes(account.Code))
        for key, value := range account.Storage {
            statedb.SetState(address, common.HexToHash(key), common.HexToHash(value))
        }
    }
    statedb.SyncObjects()

    difficulty := common.String2Big(genesis.Difficulty)
    block := types.NewBlock(&types.Header{
        Nonce:      types.EncodeNonce(common.String2Big(genesis.Nonce).Uint64()),
        Time:       common.String2Big(genesis.Timestamp).Uint64(),
        ParentHash: common.HexToHash(genesis.ParentHash),
        Extra:      common.FromHex(genesis.ExtraData),
        GasLimit:   common.String2Big(genesis.GasLimit),
        Difficulty: difficulty,
        MixDigest:  common.HexToHash(genesis.Mixhash),
        Coinbase:   common.HexToAddress(genesis.Coinbase),
        Root:       statedb.Root(),
    }, nil, nil, nil)
    block.Td = difficulty

    if block := GetBlockByHash(blockDb, block.Hash()); block != nil {
        glog.V(logger.Info).Infoln("Genesis block already in chain. Writing canonical number")
        err := WriteCanonNumber(blockDb, block)
        if err != nil {
            return nil, err
        }
        return block, nil
    }

    statedb.Sync()

    err = WriteBlock(blockDb, block)
    if err != nil {
        return nil, err
    }
    err = WriteHead(blockDb, block)
    if err != nil {
        return nil, err
    }

    return block, nil
}

// GenesisBlockForTesting creates a block in which addr has the given wei balance.
// The state trie of the block is written to db.
func GenesisBlockForTesting(db common.Database, addr common.Address, balance *big.Int) *types.Block {
    statedb := state.New(common.Hash{}, db)
    obj := statedb.GetOrNewStateObject(addr)
    obj.SetBalance(balance)
    statedb.SyncObjects()
    statedb.Sync()
    block := types.NewBlock(&types.Header{
        Difficulty: params.GenesisDifficulty,
        GasLimit:   params.GenesisGasLimit,
        Root:       statedb.Root(),
    }, nil, nil, nil)
    block.Td = params.GenesisDifficulty
    return block
}

func WriteGenesisBlockForTesting(db common.Database, addr common.Address, balance *big.Int) *types.Block {
    testGenesis := fmt.Sprintf(`{
    "nonce":"0x%x",
    "gasLimit":"0x%x",
    "difficulty":"0x%x",
    "alloc": {
        "0x%x":{"balance":"0x%x"}
    }
}`, types.EncodeNonce(0), params.GenesisGasLimit.Bytes(), params.GenesisDifficulty.Bytes(), addr, balance.Bytes())
    block, _ := WriteGenesisBlock(db, db, strings.NewReader(testGenesis))
    return block
}

func WriteTestNetGenesisBlock(stateDb, blockDb common.Database, nonce uint64) (*types.Block, error) {
    testGenesis := fmt.Sprintf(`{
    "nonce":"0x%x",
    "gasLimit":"0x%x",
    "difficulty":"0x%x",
    "alloc": {
        "0000000000000000000000000000000000000001": {"balance": "1"},
        "0000000000000000000000000000000000000002": {"balance": "1"},
        "0000000000000000000000000000000000000003": {"balance": "1"},
        "0000000000000000000000000000000000000004": {"balance": "1"},
        "dbdbdb2cbd23b783741e8d7fcf51e459b497e4a6": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "e4157b34ea9615cfbde6b4fda419828124b70c78": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "b9c015918bdaba24b4ff057a92a3873d6eb201be": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "6c386a4b26f73c802f34673f7248bb118f97424a": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "cd2a3d9f938e13cd947ec05abc7fe734df8dd826": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "2ef47100e0787b915105fd5e3f4ff6752079d5cb": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "e6716f9544a56c530d868e4bfbacb172315bdead": {"balance": "1606938044258990275541962092341162602522202993782792835301376"},
        "1a26338f0d905e295fccb71fa9ea849ffa12aaf4": {"balance": "1606938044258990275541962092341162602522202993782792835301376"}
    }
}`, types.EncodeNonce(nonce), params.GenesisGasLimit.Bytes(), params.GenesisDifficulty.Bytes())
    return WriteGenesisBlock(stateDb, blockDb, strings.NewReader(testGenesis))
}