2014-10-31 06:43:14 -07:00
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package state
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2014-07-22 02:54:48 -07:00
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import (
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2014-12-23 09:35:36 -08:00
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"bytes"
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2014-07-29 15:31:15 -07:00
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"math/big"
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2014-10-23 06:01:27 -07:00
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"github.com/ethereum/go-ethereum/ethutil"
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2014-10-31 04:56:05 -07:00
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"github.com/ethereum/go-ethereum/logger"
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2015-01-08 02:47:04 -08:00
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"github.com/ethereum/go-ethereum/trie"
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)
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2014-10-31 04:56:05 -07:00
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var statelogger = logger.NewLogger("STATE")
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2014-07-22 02:54:48 -07:00
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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 ethutil.Database
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trie *trie.SecureTrie
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stateObjects map[string]*StateObject
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refund map[string]*big.Int
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logs Logs
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}
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// Create a new state from a given trie
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func New(root []byte, db ethutil.Database) *StateDB {
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trie := trie.NewSecure(ethutil.CopyBytes(root), db)
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return &StateDB{db: db, trie: trie, stateObjects: make(map[string]*StateObject), refund: make(map[string]*big.Int)}
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}
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func (self *StateDB) EmptyLogs() {
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self.logs = nil
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}
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func (self *StateDB) AddLog(log Log) {
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self.logs = append(self.logs, log)
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}
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func (self *StateDB) Logs() Logs {
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return self.logs
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}
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func (self *StateDB) Refund(addr []byte, gas *big.Int) {
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if self.refund[string(addr)] == nil {
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self.refund[string(addr)] = new(big.Int)
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}
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self.refund[string(addr)].Add(self.refund[string(addr)], gas)
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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 []byte) *big.Int {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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return stateObject.balance
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}
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return ethutil.Big0
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}
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func (self *StateDB) AddBalance(addr []byte, 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) GetNonce(addr []byte) uint64 {
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stateObject := self.GetOrNewStateObject(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 []byte) []byte {
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stateObject := self.GetOrNewStateObject(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, b []byte) []byte {
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stateObject := self.GetOrNewStateObject(a)
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if stateObject != nil {
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return stateObject.GetState(b).Bytes()
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}
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return nil
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}
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func (self *StateDB) SetNonce(addr []byte, 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, 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, key []byte, value interface{}) {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetState(key, ethutil.NewValue(value))
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}
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}
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func (self *StateDB) Delete(addr []byte) bool {
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stateObject := self.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.MarkForDeletion()
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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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addr := stateObject.Address()
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2014-09-15 06:42:12 -07:00
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if len(stateObject.CodeHash()) > 0 {
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self.db.Put(stateObject.CodeHash(), stateObject.code)
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}
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self.trie.Update(addr, stateObject.RlpEncode())
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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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self.trie.Delete(stateObject.Address())
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delete(self.stateObjects, string(stateObject.Address()))
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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 []byte) *StateObject {
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addr = ethutil.Address(addr)
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stateObject := self.stateObjects[string(addr)]
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if stateObject != nil {
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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 = NewStateObjectFromBytes(addr, []byte(data), self.db)
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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[string(object.address)] = 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 []byte) *StateObject {
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stateObject := self.GetStateObject(addr)
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if stateObject == nil {
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stateObject = self.NewStateObject(addr)
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}
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return stateObject
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}
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// Create a state object whether it exist in the trie or not
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func (self *StateDB) NewStateObject(addr []byte) *StateObject {
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addr = ethutil.Address(addr)
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2014-08-22 01:58:49 -07:00
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statelogger.Debugf("(+) %x\n", addr)
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stateObject := NewStateObject(addr, self.db)
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self.stateObjects[string(addr)] = stateObject
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return stateObject
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}
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// Deprecated
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func (self *StateDB) GetAccount(addr []byte) *StateObject {
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return self.GetOrNewStateObject(addr)
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}
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//
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// Setting, copying of the state methods
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//
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2014-12-04 02:40:20 -08:00
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func (s *StateDB) Cmp(other *StateDB) bool {
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return bytes.Equal(s.trie.Root(), other.trie.Root())
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}
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2014-12-04 02:40:20 -08:00
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func (self *StateDB) Copy() *StateDB {
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state := New(nil, self.db)
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state.trie = self.trie.Copy()
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for k, stateObject := range self.stateObjects {
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state.stateObjects[k] = stateObject.Copy()
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}
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2015-02-11 14:46:45 -08:00
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for addr, refund := range self.refund {
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state.refund[addr] = new(big.Int).Set(refund)
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2014-07-22 02:54:48 -07:00
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}
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2015-02-11 14:46:45 -08:00
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logs := make(Logs, len(self.logs))
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copy(logs, self.logs)
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state.logs = logs
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return state
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}
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2014-12-04 02:40:20 -08:00
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func (self *StateDB) Set(state *StateDB) {
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self.trie = state.trie
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2014-07-22 02:54:48 -07:00
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self.stateObjects = state.stateObjects
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2014-10-28 05:22:04 -07:00
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self.refund = state.refund
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2014-10-30 05:32:50 -07:00
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self.logs = state.logs
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2014-07-22 02:54:48 -07:00
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}
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2014-12-04 02:40:20 -08:00
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func (s *StateDB) Root() []byte {
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return s.trie.Root()
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2014-07-22 02:54:48 -07:00
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}
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2015-03-03 08:05:51 -08:00
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func (s *StateDB) Trie() *trie.SecureTrie {
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return s.trie
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}
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2014-07-22 02:54:48 -07:00
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// Resets the trie and all siblings
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2014-12-04 02:40:20 -08:00
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func (s *StateDB) Reset() {
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s.trie.Reset()
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2014-07-22 02:54:48 -07:00
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// Reset all nested states
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for _, stateObject := range s.stateObjects {
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if stateObject.State == nil {
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2014-07-22 02:54:48 -07:00
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continue
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}
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stateObject.Reset()
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}
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s.Empty()
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}
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// Syncs the trie and all siblings
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func (s *StateDB) Sync() {
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// Sync all nested states
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for _, stateObject := range s.stateObjects {
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if stateObject.State == nil {
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2014-07-22 02:54:48 -07:00
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continue
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}
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2014-07-24 03:04:15 -07:00
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stateObject.State.Sync()
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}
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2014-12-23 09:35:36 -08:00
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s.trie.Commit()
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2014-07-22 02:54:48 -07:00
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s.Empty()
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}
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2014-12-04 02:40:20 -08:00
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func (self *StateDB) Empty() {
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2014-07-22 02:54:48 -07:00
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self.stateObjects = make(map[string]*StateObject)
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2014-12-18 13:38:51 -08:00
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self.refund = make(map[string]*big.Int)
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2014-12-18 12:58:26 -08:00
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}
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2014-12-18 13:38:51 -08:00
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func (self *StateDB) Refunds() map[string]*big.Int {
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2014-12-18 12:58:26 -08:00
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return self.refund
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}
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2014-12-04 02:40:20 -08:00
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func (self *StateDB) Update(gasUsed *big.Int) {
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2014-12-18 13:38:51 -08:00
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self.refund = make(map[string]*big.Int)
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2014-10-28 05:22:04 -07:00
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2014-07-22 02:54:48 -07:00
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for _, stateObject := range self.stateObjects {
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2015-02-19 13:33:22 -08:00
|
|
|
if stateObject.dirty {
|
|
|
|
if stateObject.remove {
|
|
|
|
self.DeleteStateObject(stateObject)
|
|
|
|
} else {
|
|
|
|
stateObject.Sync()
|
|
|
|
|
|
|
|
self.UpdateStateObject(stateObject)
|
|
|
|
}
|
|
|
|
stateObject.dirty = false
|
2014-07-22 02:54:48 -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
|
|
|
}
|
|
|
|
}
|