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87 lines
2.6 KiB
87 lines
2.6 KiB
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package snapshot
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import (
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"bytes"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// Account is a modified version of a state.Account, where the root is replaced
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// with a byte slice. This format can be used to represent full-consensus format
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// or slim-snapshot format which replaces the empty root and code hash as nil
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// byte slice.
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type Account struct {
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Nonce uint64
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Balance *big.Int
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Root []byte
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CodeHash []byte
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}
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// SlimAccount converts a state.Account content into a slim snapshot account
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func SlimAccount(nonce uint64, balance *big.Int, root common.Hash, codehash []byte) Account {
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slim := Account{
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Nonce: nonce,
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Balance: balance,
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}
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if root != types.EmptyRootHash {
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slim.Root = root[:]
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}
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if !bytes.Equal(codehash, types.EmptyCodeHash[:]) {
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slim.CodeHash = codehash
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}
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return slim
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}
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// SlimAccountRLP converts a state.Account content into a slim snapshot
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// version RLP encoded.
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func SlimAccountRLP(nonce uint64, balance *big.Int, root common.Hash, codehash []byte) []byte {
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data, err := rlp.EncodeToBytes(SlimAccount(nonce, balance, root, codehash))
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if err != nil {
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panic(err)
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}
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return data
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}
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// FullAccount decodes the data on the 'slim RLP' format and return
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// the consensus format account.
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func FullAccount(data []byte) (Account, error) {
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var account Account
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if err := rlp.DecodeBytes(data, &account); err != nil {
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return Account{}, err
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}
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if len(account.Root) == 0 {
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account.Root = types.EmptyRootHash[:]
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}
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if len(account.CodeHash) == 0 {
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account.CodeHash = types.EmptyCodeHash[:]
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}
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return account, nil
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}
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// FullAccountRLP converts data on the 'slim RLP' format into the full RLP-format.
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func FullAccountRLP(data []byte) ([]byte, error) {
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account, err := FullAccount(data)
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if err != nil {
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return nil, err
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}
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return rlp.EncodeToBytes(account)
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}
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