plugeth/state/statedb.go

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package state
import (
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"bytes"
"math/big"
"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/trie"
)
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var statelogger = logger.NewLogger("STATE")
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// 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
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type StateDB struct {
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db ethutil.Database
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trie *trie.Trie
stateObjects map[string]*StateObject
manifest *Manifest
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refund map[string]*big.Int
logs Logs
}
// Create a new state from a given trie
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func New(root []byte, db ethutil.Database) *StateDB {
trie := trie.New(ethutil.CopyBytes(root), db)
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return &StateDB{db: db, trie: trie, stateObjects: make(map[string]*StateObject), manifest: NewManifest(), refund: make(map[string]*big.Int)}
}
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func (self *StateDB) EmptyLogs() {
self.logs = nil
}
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func (self *StateDB) AddLog(log Log) {
self.logs = append(self.logs, log)
}
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func (self *StateDB) Logs() Logs {
return self.logs
}
// 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 {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
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return stateObject.balance
}
return ethutil.Big0
}
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func (self *StateDB) Refund(addr []byte, gas *big.Int) {
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if self.refund[string(addr)] == nil {
self.refund[string(addr)] = new(big.Int)
}
self.refund[string(addr)].Add(self.refund[string(addr)], gas)
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}
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func (self *StateDB) AddBalance(addr []byte, amount *big.Int) {
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stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.AddBalance(amount)
}
}
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func (self *StateDB) GetNonce(addr []byte) uint64 {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.Nonce
}
return 0
}
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func (self *StateDB) SetNonce(addr []byte, nonce uint64) {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.Nonce = nonce
}
}
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func (self *StateDB) GetCode(addr []byte) []byte {
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stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.Code
}
return nil
}
func (self *StateDB) SetCode(addr, code []byte) {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.SetCode(code)
}
}
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func (self *StateDB) GetState(a, b []byte) []byte {
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stateObject := self.GetStateObject(a)
if stateObject != nil {
return stateObject.GetState(b).Bytes()
}
return nil
}
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func (self *StateDB) SetState(addr, key []byte, value interface{}) {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.SetState(key, ethutil.NewValue(value))
}
}
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func (self *StateDB) Delete(addr []byte) bool {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.MarkForDeletion()
return true
}
return false
}
//
// Setting, updating & deleting state object methods
//
// Update the given state object and apply it to state trie
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func (self *StateDB) UpdateStateObject(stateObject *StateObject) {
addr := stateObject.Address()
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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())
}
// 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())
delete(self.stateObjects, string(stateObject.Address()))
}
// Retrieve a state object given my the address. Nil if not found
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func (self *StateDB) GetStateObject(addr []byte) *StateObject {
addr = ethutil.Address(addr)
stateObject := self.stateObjects[string(addr)]
if stateObject != nil {
return stateObject
}
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data := self.trie.Get(addr)
if len(data) == 0 {
return nil
}
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stateObject = NewStateObjectFromBytes(addr, []byte(data), self.db)
self.SetStateObject(stateObject)
return stateObject
}
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func (self *StateDB) SetStateObject(object *StateObject) {
self.stateObjects[string(object.address)] = object
}
// Retrieve a state object or create a new state object if nil
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func (self *StateDB) GetOrNewStateObject(addr []byte) *StateObject {
stateObject := self.GetStateObject(addr)
if stateObject == nil {
stateObject = self.NewStateObject(addr)
}
return stateObject
}
// Create a state object whether it exist in the trie or not
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func (self *StateDB) NewStateObject(addr []byte) *StateObject {
addr = ethutil.Address(addr)
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statelogger.Debugf("(+) %x\n", addr)
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stateObject := NewStateObject(addr, self.db)
self.stateObjects[string(addr)] = stateObject
return stateObject
}
// Deprecated
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func (self *StateDB) GetAccount(addr []byte) *StateObject {
return self.GetOrNewStateObject(addr)
}
//
// Setting, copying of the state methods
//
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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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func (self *StateDB) Copy() *StateDB {
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if self.trie != nil {
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state := New(nil, self.db)
state.trie = self.trie.Copy()
for k, stateObject := range self.stateObjects {
state.stateObjects[k] = stateObject.Copy()
}
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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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}
logs := make(Logs, len(self.logs))
copy(logs, self.logs)
state.logs = logs
return state
}
return nil
}
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func (self *StateDB) Set(state *StateDB) {
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self.trie = state.trie
self.stateObjects = state.stateObjects
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self.refund = state.refund
self.logs = state.logs
}
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func (s *StateDB) Root() []byte {
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return s.trie.Root()
}
// Resets the trie and all siblings
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func (s *StateDB) Reset() {
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s.trie.Reset()
// Reset all nested states
for _, stateObject := range s.stateObjects {
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if stateObject.State == nil {
continue
}
stateObject.Reset()
}
s.Empty()
}
// Syncs the trie and all siblings
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func (s *StateDB) Sync() {
// Sync all nested states
for _, stateObject := range s.stateObjects {
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if stateObject.State == nil {
continue
}
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stateObject.State.Sync()
}
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s.trie.Commit()
s.Empty()
}
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func (self *StateDB) Empty() {
self.stateObjects = make(map[string]*StateObject)
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self.refund = make(map[string]*big.Int)
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}
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func (self *StateDB) Refunds() map[string]*big.Int {
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return self.refund
}
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func (self *StateDB) Update(gasUsed *big.Int) {
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self.refund = make(map[string]*big.Int)
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for _, stateObject := range self.stateObjects {
if stateObject.remove {
self.DeleteStateObject(stateObject)
} else {
stateObject.Sync()
self.UpdateStateObject(stateObject)
}
}
}
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func (self *StateDB) Manifest() *Manifest {
return self.manifest
}
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// Debug stuff
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func (self *StateDB) CreateOutputForDiff() {
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for _, stateObject := range self.stateObjects {
stateObject.CreateOutputForDiff()
}
}