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state_account.go
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state_account.go
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// (c) 2019-2021, Ava Labs, Inc.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2021 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 types
import (
"bytes"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/rlp"
)
//go:generate go run github.com/ethereum/go-ethereum/rlp/rlpgen -type StateAccount -out gen_account_rlp.go
// StateAccount is the Ethereum consensus representation of accounts.
// These objects are stored in the main account trie.
type StateAccount struct {
Nonce uint64
Balance *big.Int
Root common.Hash // merkle root of the storage trie
CodeHash []byte
}
// NewEmptyStateAccount constructs an empty state account.
func NewEmptyStateAccount() *StateAccount {
return &StateAccount{
Balance: new(big.Int),
Root: EmptyRootHash,
CodeHash: EmptyCodeHash.Bytes(),
}
}
// Copy returns a deep-copied state account object.
func (acct *StateAccount) Copy() *StateAccount {
var balance *big.Int
if acct.Balance != nil {
balance = new(big.Int).Set(acct.Balance)
}
return &StateAccount{
Nonce: acct.Nonce,
Balance: balance,
Root: acct.Root,
CodeHash: common.CopyBytes(acct.CodeHash),
}
}
// SlimAccount is a modified version of an Account, where the root is replaced
// with a byte slice. This format can be used to represent full-consensus format
// or slim format which replaces the empty root and code hash as nil byte slice.
type SlimAccount struct {
Nonce uint64
Balance *big.Int
Root []byte // Nil if root equals to types.EmptyRootHash
CodeHash []byte // Nil if hash equals to types.EmptyCodeHash
}
// SlimAccountRLP encodes the state account in 'slim RLP' format.
func SlimAccountRLP(account StateAccount) []byte {
slim := SlimAccount{
Nonce: account.Nonce,
Balance: account.Balance,
}
if account.Root != EmptyRootHash {
slim.Root = account.Root[:]
}
if !bytes.Equal(account.CodeHash, EmptyCodeHash[:]) {
slim.CodeHash = account.CodeHash
}
data, err := rlp.EncodeToBytes(slim)
if err != nil {
panic(err)
}
return data
}
// FullAccount decodes the data on the 'slim RLP' format and return
// the consensus format account.
func FullAccount(data []byte) (*StateAccount, error) {
var slim SlimAccount
if err := rlp.DecodeBytes(data, &slim); err != nil {
return nil, err
}
var account StateAccount
account.Nonce, account.Balance = slim.Nonce, slim.Balance
// Interpret the storage root and code hash in slim format.
if len(slim.Root) == 0 {
account.Root = EmptyRootHash
} else {
account.Root = common.BytesToHash(slim.Root)
}
if len(slim.CodeHash) == 0 {
account.CodeHash = EmptyCodeHash[:]
} else {
account.CodeHash = slim.CodeHash
}
return &account, nil
}
// FullAccountRLP converts data on the 'slim RLP' format into the full RLP-format.
func FullAccountRLP(data []byte) ([]byte, error) {
account, err := FullAccount(data)
if err != nil {
return nil, err
}
return rlp.EncodeToBytes(account)
}