2015-07-06 17:54:22 -07:00
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// Copyright 2014 The go-ethereum Authors
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2015-07-22 09:48:40 -07:00
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// This file is part of the go-ethereum library.
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2015-07-06 17:54:22 -07:00
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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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2015-07-06 17:54:22 -07:00
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2015-07-06 20:08:16 -07:00
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// Package state provides a caching layer atop the Ethereum state trie.
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2014-10-31 06:43:14 -07:00
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package state
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import (
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"fmt"
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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/vm"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/trie"
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)
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2015-10-05 04:01:34 -07:00
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// The starting nonce determines the default nonce when new accounts are being
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// created.
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var StartingNonce uint64
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2014-12-04 02:40:20 -08:00
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// StateDBs within the ethereum protocol are used to store anything
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// within the merkle trie. StateDBs take care of caching and storing
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// nested states. It's the general query interface to retrieve:
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// * Contracts
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// * Accounts
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type StateDB struct {
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db ethdb.Database
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trie *trie.SecureTrie
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stateObjects map[string]*StateObject
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refund *big.Int
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thash, bhash common.Hash
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txIndex int
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logs map[common.Hash]vm.Logs
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logSize uint
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}
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// Create a new state from a given trie
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func New(root common.Hash, db ethdb.Database) (*StateDB, error) {
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tr, err := trie.NewSecure(root, db)
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if err != nil {
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return nil, err
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}
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return &StateDB{
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db: db,
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trie: tr,
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stateObjects: make(map[string]*StateObject),
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refund: new(big.Int),
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logs: make(map[common.Hash]vm.Logs),
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}, nil
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}
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func (self *StateDB) StartRecord(thash, bhash common.Hash, ti int) {
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self.thash = thash
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self.bhash = bhash
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self.txIndex = ti
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}
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func (self *StateDB) AddLog(log *vm.Log) {
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log.TxHash = self.thash
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log.BlockHash = self.bhash
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log.TxIndex = uint(self.txIndex)
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log.Index = self.logSize
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self.logs[self.thash] = append(self.logs[self.thash], log)
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self.logSize++
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}
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func (self *StateDB) GetLogs(hash common.Hash) vm.Logs {
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return self.logs[hash]
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}
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func (self *StateDB) Logs() vm.Logs {
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var logs vm.Logs
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for _, lgs := range self.logs {
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logs = append(logs, lgs...)
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}
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return logs
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}
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func (self *StateDB) AddRefund(gas *big.Int) {
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self.refund.Add(self.refund, gas)
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}
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func (self *StateDB) HasAccount(addr common.Address) bool {
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return self.GetStateObject(addr) != nil
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}
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func (self *StateDB) Exist(addr common.Address) bool {
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return self.GetStateObject(addr) != nil
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}
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func (self *StateDB) GetAccount(addr common.Address) vm.Account {
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return self.GetStateObject(addr)
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}
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// Retrieve the balance from the given address or 0 if object not found
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func (self *StateDB) GetBalance(addr common.Address) *big.Int {
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stateObject := self.GetStateObject(addr)
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if stateObject != nil {
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return stateObject.balance
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}
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return common.Big0
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}
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func (self *StateDB) GetNonce(addr common.Address) uint64 {
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stateObject := self.GetStateObject(addr)
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if stateObject != nil {
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return stateObject.nonce
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}
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return 0
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}
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func (self *StateDB) GetCode(addr common.Address) []byte {
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stateObject := self.GetStateObject(addr)
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if stateObject != nil {
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return stateObject.code
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}
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return nil
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}
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func (self *StateDB) GetState(a common.Address, b common.Hash) common.Hash {
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stateObject := self.GetStateObject(a)
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if stateObject != nil {
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return stateObject.GetState(b)
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}
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return common.Hash{}
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}
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func (self *StateDB) IsDeleted(addr common.Address) bool {
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stateObject := self.GetStateObject(addr)
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if stateObject != nil {
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return stateObject.remove
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}
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return false
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}
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/*
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* SETTERS
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*/
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func (self *StateDB) AddBalance(addr common.Address, amount *big.Int) {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.AddBalance(amount)
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}
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}
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func (self *StateDB) SetNonce(addr common.Address, nonce uint64) {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetNonce(nonce)
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}
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}
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func (self *StateDB) SetCode(addr common.Address, code []byte) {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetCode(code)
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}
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}
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func (self *StateDB) SetState(addr common.Address, key common.Hash, value common.Hash) {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetState(key, value)
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}
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}
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2015-03-16 03:59:52 -07:00
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func (self *StateDB) Delete(addr common.Address) bool {
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stateObject := self.GetStateObject(addr)
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if stateObject != nil {
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stateObject.MarkForDeletion()
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stateObject.balance = new(big.Int)
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return true
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}
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return false
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}
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2014-07-22 02:54:48 -07:00
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//
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// Setting, updating & deleting state object methods
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//
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// Update the given state object and apply it to state trie
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func (self *StateDB) UpdateStateObject(stateObject *StateObject) {
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if len(stateObject.code) > 0 {
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self.db.Put(stateObject.codeHash, stateObject.code)
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}
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addr := stateObject.Address()
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data, err := rlp.EncodeToBytes(stateObject)
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if err != nil {
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panic(fmt.Errorf("can't encode object at %x: %v", addr[:], err))
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}
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self.trie.Update(addr[:], data)
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}
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// Delete the given state object and delete it from the state trie
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func (self *StateDB) DeleteStateObject(stateObject *StateObject) {
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stateObject.deleted = true
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addr := stateObject.Address()
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self.trie.Delete(addr[:])
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//delete(self.stateObjects, addr.Str())
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}
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// Retrieve a state object given my the address. Nil if not found
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func (self *StateDB) GetStateObject(addr common.Address) (stateObject *StateObject) {
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stateObject = self.stateObjects[addr.Str()]
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if stateObject != nil {
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if stateObject.deleted {
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stateObject = nil
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}
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return stateObject
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}
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data := self.trie.Get(addr[:])
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if len(data) == 0 {
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return nil
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}
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stateObject, err := DecodeObject(addr, self.db, data)
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if err != nil {
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glog.Errorf("can't decode object at %x: %v", addr[:], err)
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return nil
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}
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self.SetStateObject(stateObject)
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return stateObject
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}
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func (self *StateDB) SetStateObject(object *StateObject) {
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self.stateObjects[object.Address().Str()] = object
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}
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// Retrieve a state object or create a new state object if nil
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func (self *StateDB) GetOrNewStateObject(addr common.Address) *StateObject {
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stateObject := self.GetStateObject(addr)
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if stateObject == nil || stateObject.deleted {
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stateObject = self.CreateStateObject(addr)
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}
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return stateObject
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}
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2015-04-01 01:53:32 -07:00
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// NewStateObject create a state object whether it exist in the trie or not
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func (self *StateDB) newStateObject(addr common.Address) *StateObject {
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if glog.V(logger.Core) {
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2015-04-03 08:09:01 -07:00
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glog.Infof("(+) %x\n", addr)
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}
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2015-01-07 04:17:48 -08:00
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stateObject := NewStateObject(addr, self.db)
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stateObject.SetNonce(StartingNonce)
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self.stateObjects[addr.Str()] = stateObject
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return stateObject
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}
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2015-04-01 01:53:32 -07:00
|
|
|
// Creates creates a new state object and takes ownership. This is different from "NewStateObject"
|
2015-08-30 01:19:10 -07:00
|
|
|
func (self *StateDB) CreateStateObject(addr common.Address) *StateObject {
|
2015-04-01 01:53:32 -07:00
|
|
|
// Get previous (if any)
|
|
|
|
so := self.GetStateObject(addr)
|
|
|
|
// Create a new one
|
|
|
|
newSo := self.newStateObject(addr)
|
|
|
|
|
|
|
|
// If it existed set the balance to the new account
|
|
|
|
if so != nil {
|
|
|
|
newSo.balance = so.balance
|
|
|
|
}
|
|
|
|
|
|
|
|
return newSo
|
2014-07-22 02:54:48 -07:00
|
|
|
}
|
|
|
|
|
2015-08-30 01:19:10 -07:00
|
|
|
func (self *StateDB) CreateAccount(addr common.Address) vm.Account {
|
|
|
|
return self.CreateStateObject(addr)
|
|
|
|
}
|
|
|
|
|
2014-07-22 02:54:48 -07:00
|
|
|
//
|
|
|
|
// Setting, copying of the state methods
|
|
|
|
//
|
|
|
|
|
2014-12-04 02:40:20 -08:00
|
|
|
func (self *StateDB) Copy() *StateDB {
|
2015-10-06 07:35:55 -07:00
|
|
|
// ignore error - we assume state-to-be-copied always exists
|
|
|
|
state, _ := New(common.Hash{}, self.db)
|
2015-06-17 04:39:19 -07:00
|
|
|
state.trie = self.trie
|
2015-02-11 14:46:45 -08:00
|
|
|
for k, stateObject := range self.stateObjects {
|
|
|
|
state.stateObjects[k] = stateObject.Copy()
|
|
|
|
}
|
2014-10-30 05:32:50 -07:00
|
|
|
|
2015-06-17 01:20:33 -07:00
|
|
|
state.refund.Set(self.refund)
|
2014-07-22 02:54:48 -07:00
|
|
|
|
2015-04-08 08:14:58 -07:00
|
|
|
for hash, logs := range self.logs {
|
2015-08-30 01:19:10 -07:00
|
|
|
state.logs[hash] = make(vm.Logs, len(logs))
|
2015-04-08 08:14:58 -07:00
|
|
|
copy(state.logs[hash], logs)
|
|
|
|
}
|
2015-07-29 05:16:36 -07:00
|
|
|
state.logSize = self.logSize
|
2015-02-11 14:46:45 -08:00
|
|
|
|
|
|
|
return state
|
2014-07-22 02:54:48 -07:00
|
|
|
}
|
|
|
|
|
2014-12-04 02:40:20 -08:00
|
|
|
func (self *StateDB) Set(state *StateDB) {
|
2014-12-23 09:35:36 -08:00
|
|
|
self.trie = state.trie
|
2014-07-22 02:54:48 -07:00
|
|
|
self.stateObjects = state.stateObjects
|
2015-02-03 06:56:19 -08:00
|
|
|
|
2014-10-28 05:22:04 -07:00
|
|
|
self.refund = state.refund
|
2014-10-30 05:32:50 -07:00
|
|
|
self.logs = state.logs
|
2015-07-29 05:16:36 -07:00
|
|
|
self.logSize = state.logSize
|
2014-07-22 02:54:48 -07:00
|
|
|
}
|
|
|
|
|
2015-08-30 01:19:10 -07:00
|
|
|
func (self *StateDB) GetRefund() *big.Int {
|
|
|
|
return self.refund
|
|
|
|
}
|
|
|
|
|
2015-08-18 05:14:45 -07:00
|
|
|
// IntermediateRoot computes the current root hash of the state trie.
|
|
|
|
// It is called in between transactions to get the root hash that
|
|
|
|
// goes into transaction receipts.
|
|
|
|
func (s *StateDB) IntermediateRoot() common.Hash {
|
|
|
|
s.refund = new(big.Int)
|
2014-07-22 02:54:48 -07:00
|
|
|
for _, stateObject := range s.stateObjects {
|
2015-02-19 13:33:22 -08:00
|
|
|
if stateObject.dirty {
|
|
|
|
if stateObject.remove {
|
2015-08-18 05:14:45 -07:00
|
|
|
s.DeleteStateObject(stateObject)
|
2015-02-19 13:33:22 -08:00
|
|
|
} else {
|
2015-06-17 04:27:51 -07:00
|
|
|
stateObject.Update()
|
2015-08-18 05:14:45 -07:00
|
|
|
s.UpdateStateObject(stateObject)
|
2015-02-19 13:33:22 -08:00
|
|
|
}
|
|
|
|
stateObject.dirty = false
|
2014-07-22 02:54:48 -07:00
|
|
|
}
|
|
|
|
}
|
2015-08-18 05:14:45 -07:00
|
|
|
return s.trie.Hash()
|
2014-07-22 02:54:48 -07:00
|
|
|
}
|
|
|
|
|
2015-08-18 05:14:45 -07:00
|
|
|
// Commit commits all state changes to the database.
|
|
|
|
func (s *StateDB) Commit() (root common.Hash, err error) {
|
|
|
|
return s.commit(s.db)
|
|
|
|
}
|
|
|
|
|
|
|
|
// CommitBatch commits all state changes to a write batch but does not
|
|
|
|
// execute the batch. It is used to validate state changes against
|
|
|
|
// the root hash stored in a block.
|
|
|
|
func (s *StateDB) CommitBatch() (root common.Hash, batch ethdb.Batch) {
|
|
|
|
batch = s.db.NewBatch()
|
|
|
|
root, _ = s.commit(batch)
|
|
|
|
return root, batch
|
|
|
|
}
|
2015-06-30 14:49:34 -07:00
|
|
|
|
2015-08-18 05:14:45 -07:00
|
|
|
func (s *StateDB) commit(db trie.DatabaseWriter) (common.Hash, error) {
|
|
|
|
s.refund = new(big.Int)
|
2015-06-30 14:49:34 -07:00
|
|
|
|
2015-08-18 05:14:45 -07:00
|
|
|
for _, stateObject := range s.stateObjects {
|
2015-06-30 14:49:34 -07:00
|
|
|
if stateObject.remove {
|
2015-08-18 05:14:45 -07:00
|
|
|
// If the object has been removed, don't bother syncing it
|
|
|
|
// and just mark it for deletion in the trie.
|
|
|
|
s.DeleteStateObject(stateObject)
|
2015-06-30 14:49:34 -07:00
|
|
|
} else {
|
2015-08-18 05:14:45 -07:00
|
|
|
// Write any storage changes in the state object to its trie.
|
2015-06-30 14:49:34 -07:00
|
|
|
stateObject.Update()
|
2015-08-18 05:14:45 -07:00
|
|
|
// Commit the trie of the object to the batch.
|
|
|
|
// This updates the trie root internally, so
|
|
|
|
// getting the root hash of the storage trie
|
|
|
|
// through UpdateStateObject is fast.
|
|
|
|
if _, err := stateObject.trie.CommitTo(db); err != nil {
|
|
|
|
return common.Hash{}, err
|
|
|
|
}
|
|
|
|
// Update the object in the account trie.
|
|
|
|
s.UpdateStateObject(stateObject)
|
2015-06-30 14:49:34 -07:00
|
|
|
}
|
|
|
|
stateObject.dirty = false
|
|
|
|
}
|
2015-08-18 05:14:45 -07:00
|
|
|
return s.trie.CommitTo(db)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (self *StateDB) Refunds() *big.Int {
|
|
|
|
return self.refund
|
2015-06-30 14:49:34 -07:00
|
|
|
}
|
|
|
|
|
2014-08-11 07:23:38 -07:00
|
|
|
// Debug stuff
|
2014-12-04 02:40:20 -08:00
|
|
|
func (self *StateDB) CreateOutputForDiff() {
|
2014-08-11 07:23:38 -07:00
|
|
|
for _, stateObject := range self.stateObjects {
|
|
|
|
stateObject.CreateOutputForDiff()
|
2014-07-22 02:54:48 -07:00
|
|
|
}
|
|
|
|
}
|