Fantom-foundation/go-lachesis

// Copyright 2015 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/>.

package evmcore

import (
    "math"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/log"

    "github.com/Fantom-foundation/go-lachesis/inter"
    "github.com/Fantom-foundation/go-lachesis/lachesis"
)

// ApplyGenesis writes or updates the genesis block in db.
func ApplyGenesis(db ethdb.Database, net *lachesis.Config) (*EvmBlock, error) {
    if net == nil {
        return nil, ErrNoGenesis
    }

    // state
    statedb, err := state.New(common.Hash{}, state.NewDatabase(db), nil)
    if err != nil {
        return nil, err
    }
    for addr, account := range net.Genesis.Alloc.Accounts {
        statedb.AddBalance(addr, account.Balance)
        statedb.SetCode(addr, account.Code)
        statedb.SetNonce(addr, account.Nonce)
        for key, value := range account.Storage {
            statedb.SetState(addr, key, value)
        }
    }

    // initial block
    root, err := statedb.Commit(true)
    if err != nil {
        return nil, err
    }
    block := genesisBlock(net, root)

    err = statedb.Database().TrieDB().Commit(root, false, nil)
    if err != nil {
        return nil, err
    }

    return block, nil
}

// genesisBlock makes genesis block with pretty hash.
func genesisBlock(net *lachesis.Config, root common.Hash) *EvmBlock {

    block := &EvmBlock{
        EvmHeader: EvmHeader{
            Number:   big.NewInt(0),
            Time:     net.Genesis.Time,
            GasLimit: math.MaxUint64,
            Root:     root,
            TxHash:   inter.EmptyTxHash,
        },
    }

    return block
}

// MustApplyGenesis writes the genesis block and state to db, panicking on error.
func MustApplyGenesis(net *lachesis.Config, db ethdb.Database) *EvmBlock {
    block, err := ApplyGenesis(db, net)
    if err != nil {
        log.Crit("ApplyGenesis", "err", err)
    }
    return block
}