go-ethereum/state/state.go

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package state
import (
"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")
// States within the ethereum protocol are used to store anything
// within the merkle trie. States take care of caching and storing
// nested states. It's the general query interface to retrieve:
// * Contracts
// * Accounts
type State struct {
// The trie for this structure
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Trie *trie.Trie
stateObjects map[string]*StateObject
manifest *Manifest
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refund map[string][]refund
logs Logs
}
// Create a new state from a given trie
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func New(trie *trie.Trie) *State {
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return &State{Trie: trie, stateObjects: make(map[string]*StateObject), manifest: NewManifest(), refund: make(map[string][]refund)}
}
func (self *State) EmptyLogs() {
self.logs = nil
}
func (self *State) AddLog(log *Log) {
self.logs = append(self.logs, log)
}
func (self *State) Logs() Logs {
return self.logs
}
// Retrieve the balance from the given address or 0 if object not found
func (self *State) 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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type refund struct {
gas, price *big.Int
}
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func (self *State) Refund(addr []byte, gas, price *big.Int) {
self.refund[string(addr)] = append(self.refund[string(addr)], refund{gas, price})
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}
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func (self *State) AddBalance(addr []byte, amount *big.Int) {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.AddBalance(amount)
}
}
func (self *State) GetNonce(addr []byte) uint64 {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.Nonce
}
return 0
}
func (self *State) SetNonce(addr []byte, nonce uint64) {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.Nonce = nonce
}
}
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func (self *State) GetCode(addr []byte) []byte {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.Code
}
return nil
}
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func (self *State) GetState(a, b []byte) []byte {
stateObject := self.GetStateObject(a)
if stateObject != nil {
return stateObject.GetState(b).Bytes()
}
return nil
}
func (self *State) SetState(addr, key []byte, value interface{}) {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
stateObject.SetState(key, ethutil.NewValue(value))
}
}
func (self *State) 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
func (self *State) UpdateStateObject(stateObject *StateObject) {
addr := stateObject.Address()
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if len(stateObject.CodeHash()) > 0 {
ethutil.Config.Db.Put(stateObject.CodeHash(), stateObject.Code)
}
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self.Trie.Update(string(addr), string(stateObject.RlpEncode()))
}
// Delete the given state object and delete it from the state trie
func (self *State) DeleteStateObject(stateObject *StateObject) {
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self.Trie.Delete(string(stateObject.Address()))
delete(self.stateObjects, string(stateObject.Address()))
}
// Retrieve a state object given my the address. Nil if not found
func (self *State) 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(string(addr))
if len(data) == 0 {
return nil
}
stateObject = NewStateObjectFromBytes(addr, []byte(data))
self.SetStateObject(stateObject)
return stateObject
}
func (self *State) SetStateObject(object *StateObject) {
self.stateObjects[string(object.address)] = object
}
// Retrieve a state object or create a new state object if nil
func (self *State) 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
func (self *State) NewStateObject(addr []byte) *StateObject {
addr = ethutil.Address(addr)
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statelogger.Debugf("(+) %x\n", addr)
stateObject := NewStateObject(addr)
self.stateObjects[string(addr)] = stateObject
return stateObject
}
// Deprecated
func (self *State) GetAccount(addr []byte) *StateObject {
return self.GetOrNewStateObject(addr)
}
//
// Setting, copying of the state methods
//
func (s *State) Cmp(other *State) bool {
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return s.Trie.Cmp(other.Trie)
}
func (self *State) Copy() *State {
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if self.Trie != nil {
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state := New(self.Trie.Copy())
for k, stateObject := range self.stateObjects {
state.stateObjects[k] = stateObject.Copy()
}
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for addr, refund := range self.refund {
state.refund[addr] = refund
}
logs := make(Logs, len(self.logs))
copy(logs, self.logs)
state.logs = logs
return state
}
return nil
}
func (self *State) Set(state *State) {
if state == nil {
panic("Tried setting 'state' to nil through 'Set'")
}
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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 *State) Root() []byte {
return s.Trie.GetRoot()
}
// Resets the trie and all siblings
func (s *State) Reset() {
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s.Trie.Undo()
// Reset all nested states
for _, stateObject := range s.stateObjects {
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if stateObject.State == nil {
continue
}
//stateObject.state.Reset()
stateObject.Reset()
}
s.Empty()
}
// Syncs the trie and all siblings
func (s *State) 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.Sync()
s.Empty()
}
func (self *State) Empty() {
self.stateObjects = make(map[string]*StateObject)
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self.refund = make(map[string][]refund)
}
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func (self *State) Update(gasUsed *big.Int) {
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var deleted bool
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// Refund any gas that's left
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uhalf := new(big.Int).Div(gasUsed, ethutil.Big2)
for addr, refs := range self.refund {
for _, ref := range refs {
refund := ethutil.BigMin(uhalf, ref.gas)
self.GetStateObject([]byte(addr)).AddBalance(refund.Mul(refund, ref.price))
}
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}
for _, stateObject := range self.stateObjects {
if stateObject.remove {
self.DeleteStateObject(stateObject)
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deleted = true
} else {
stateObject.Sync()
self.UpdateStateObject(stateObject)
}
}
// FIXME trie delete is broken
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if deleted {
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valid, t2 := trie.ParanoiaCheck(self.Trie)
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if !valid {
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statelogger.Infof("Warn: PARANOIA: Different state root during copy %x vs %x\n", self.Trie.GetRoot(), t2.GetRoot())
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self.Trie = t2
}
}
}
func (self *State) Manifest() *Manifest {
return self.manifest
}
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// Debug stuff
func (self *State) CreateOutputForDiff() {
for _, stateObject := range self.stateObjects {
stateObject.CreateOutputForDiff()
}
}