package state
import (
"bytes"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/trie"
"github.com/golang/glog"
)
var statelogger = logger.NewLogger("STATE")
// StateDBs within the ethereum protocol are used to store anything
// within the merkle trie. StateDBs take care of caching and storing
// nested states. It's the general query interface to retrieve:
// * Contracts
// * Accounts
type StateDB struct {
db common.Database
trie *trie.SecureTrie
stateObjects map[string]*StateObject
refund map[string]*big.Int
logs Logs
}
// Create a new state from a given trie
func New(root common.Hash, db common.Database) *StateDB {
trie := trie.NewSecure(root[:], db)
return &StateDB{db: db, trie: trie, stateObjects: make(map[string]*StateObject), refund: make(map[string]*big.Int)}
}
func (self *StateDB) PrintRoot() {
self.trie.Trie.PrintRoot()
}
func (self *StateDB) EmptyLogs() {
self.logs = nil
}
func (self *StateDB) AddLog(log Log) {
self.logs = append(self.logs, log)
}
func (self *StateDB) Logs() Logs {
return self.logs
}
func (self *StateDB) Refund(address common.Address, gas *big.Int) {
addr := address.Str()
if self.refund[addr] == nil {
self.refund[addr] = new(big.Int)
}
self.refund[addr].Add(self.refund[addr], gas)
}
/*
* GETTERS
*/
// Retrieve the balance from the given address or 0 if object not found
func (self *StateDB) GetBalance(addr common.Address) *big.Int {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.balance
}
return common.Big0
}
func (self *StateDB) GetNonce(addr common.Address) uint64 {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.nonce
}
return 0
}
func (self *StateDB) GetCode(addr common.Address) []byte {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.code
}
return nil
}
func (self *StateDB) GetState(a common.Address, b common.Hash) []byte {
stateObject := self.GetStateObject(a)
if stateObject != nil {
return stateObject.GetState(b).Bytes()
}
return nil
}
func (self *StateDB) IsDeleted(addr common.Address) bool {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.remove
}
return false
}
/*
* SETTERS
*/
func (self *StateDB) AddBalance(addr common.Address, amount *big.Int) {
stateObject := self.GetOrNewStateObject(addr)
if stateObject != nil {
stateObject.AddBalance(amount)
}
}
func (self *StateDB) SetNonce(addr common.Address, nonce uint64) {
stateObject := self.GetOrNewStateObject(addr)
if stateObject != nil {
stateObject.SetNonce(nonce)
}
}
func (self *StateDB) SetCode(addr common.Address, code []byte) {
stateObject := self.GetOrNewStateObject(addr)
if stateObject != nil {
stateObject.SetCode(code)
}
}
func (self *StateDB) SetState(addr common.Address, key common.Hash, value interface{}) {
stateObject := self.GetOrNewStateObject(addr)
if stateObject != nil {
stateObject.SetState(key, common.NewValue(value))
}
}
func (self *StateDB) Delete(addr common.Address) bool {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.MarkForDeletion()
stateObject.balance = new(big.Int)
return true
}
return false
}
//
// Setting, updating & deleting state object methods
//
// Update the given state object and apply it to state trie
func (self *StateDB) UpdateStateObject(stateObject *StateObject) {
//addr := stateObject.Address()
if len(stateObject.CodeHash()) > 0 {
self.db.Put(stateObject.CodeHash(), stateObject.code)
}
addr := stateObject.Address()
self.trie.Update(addr[:], stateObject.RlpEncode())
}
// Delete the given state object and delete it from the state trie
func (self *StateDB) DeleteStateObject(stateObject *StateObject) {
addr := stateObject.Address()
self.trie.Delete(addr[:])
delete(self.stateObjects, addr.Str())
}
// Retrieve a state object given my the address. Nil if not found
func (self *StateDB) GetStateObject(addr common.Address) *StateObject {
//addr = common.Address(addr)
stateObject := self.stateObjects[addr.Str()]
if stateObject != nil {
return stateObject
}
data := self.trie.Get(addr[:])
if len(data) == 0 {
return nil
}
stateObject = NewStateObjectFromBytes(addr, []byte(data), self.db)
self.SetStateObject(stateObject)
return stateObject
}
func (self *StateDB) SetStateObject(object *StateObject) {
self.stateObjects[object.Address().Str()] = object
}
// Retrieve a state object or create a new state object if nil
func (self *StateDB) GetOrNewStateObject(addr common.Address) *StateObject {
stateObject := self.GetStateObject(addr)
if stateObject == nil {
stateObject = self.CreateAccount(addr)
}
return stateObject
}
// NewStateObject create a state object whether it exist in the trie or not
func (self *StateDB) newStateObject(addr common.Address) *StateObject {
if glog.V(logger.Debug) {
glog.Infof("(+) %x\n", addr)
}
stateObject := NewStateObject(addr, self.db)
self.stateObjects[addr.Str()] = stateObject
return stateObject
}
// Creates creates a new state object and takes ownership. This is different from "NewStateObject"
func (self *StateDB) CreateAccount(addr common.Address) *StateObject {
// 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
}
//
// Setting, copying of the state methods
//
func (s *StateDB) Cmp(other *StateDB) bool {
return bytes.Equal(s.trie.Root(), other.trie.Root())
}
func (self *StateDB) Copy() *StateDB {
state := New(common.Hash{}, self.db)
state.trie = self.trie.Copy()
for k, stateObject := range self.stateObjects {
state.stateObjects[k] = stateObject.Copy()
}
for addr, refund := range self.refund {
state.refund[addr] = new(big.Int).Set(refund)
}
logs := make(Logs, len(self.logs))
copy(logs, self.logs)
state.logs = logs
return state
}
func (self *StateDB) Set(state *StateDB) {
self.trie = state.trie
self.stateObjects = state.stateObjects
self.refund = state.refund
self.logs = state.logs
}
func (s *StateDB) Root() common.Hash {
return common.BytesToHash(s.trie.Root())
}
func (s *StateDB) Trie() *trie.SecureTrie {
return s.trie
}
// Resets the trie and all siblings
func (s *StateDB) Reset() {
s.trie.Reset()
// Reset all nested states
for _, stateObject := range s.stateObjects {
if stateObject.State == nil {
continue
}
stateObject.Reset()
}
s.Empty()
}
// Syncs the trie and all siblings
func (s *StateDB) Sync() {
// Sync all nested states
for _, stateObject := range s.stateObjects {
if stateObject.State == nil {
continue
}
stateObject.State.Sync()
}
s.trie.Commit()
s.Empty()
}
func (self *StateDB) Empty() {
self.stateObjects = make(map[string]*StateObject)
self.refund = make(map[string]*big.Int)
}
func (self *StateDB) Refunds() map[string]*big.Int {
return self.refund
}
func (self *StateDB) Update() {
self.refund = make(map[string]*big.Int)
for _, stateObject := range self.stateObjects {
if stateObject.dirty {
if stateObject.remove {
self.DeleteStateObject(stateObject)
} else {
stateObject.Sync()
self.UpdateStateObject(stateObject)
}
stateObject.dirty = false
}
}
}
// Debug stuff
func (self *StateDB) CreateOutputForDiff() {
for _, stateObject := range self.stateObjects {
stateObject.CreateOutputForDiff()
}
}