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package ethstate
import (
"math/big"
"github.com/ethereum/eth-go/ethcrypto"
"github.com/ethereum/eth-go/ethlog"
"github.com/ethereum/eth-go/ethtrie"
"github.com/ethereum/eth-go/ethutil"
)
var statelogger = ethlog.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
Trie *ethtrie.Trie
stateObjects map[string]*StateObject
manifest *Manifest
}
// Create a new state from a given trie
func New(trie *ethtrie.Trie) *State {
return &State{Trie: trie, stateObjects: make(map[string]*StateObject), manifest: NewManifest()}
}
// 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 {
return stateObject.Balance
}
return ethutil.Big0
}
func (self *State) GetNonce(addr []byte) uint64 {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.Nonce
}
return 0
}
func (self *State) GetCode(addr []byte) []byte {
stateObject := self.GetStateObject(addr)
if stateObject != nil {
return stateObject.Code
}
return nil
}
//
// 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()
ethutil.Config.Db.Put(ethcrypto.Sha3Bin(stateObject.Code), stateObject.Code)
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) {
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
}
data := self.Trie.Get(string(addr))
if len(data) == 0 {
return nil
}
stateObject = NewStateObjectFromBytes(addr, []byte(data))
self.stateObjects[string(addr)] = stateObject
return stateObject
}
// 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)
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 {
return s.Trie.Cmp(other.Trie)
}
func (self *State) Copy() *State {
if self.Trie != nil {
state := New(self.Trie.Copy())
for k, stateObject := range self.stateObjects {
state.stateObjects[k] = stateObject.Copy()
}
return state
}
return nil
}
func (self *State) Set(state *State) {
if state == nil {
panic("Tried setting 'state' to nil through 'Set'")
}
self.Trie = state.Trie
self.stateObjects = state.stateObjects
}
func (s *State) Root() interface{} {
return s.Trie.Root
}
// Resets the trie and all siblings
func (s *State) Reset() {
s.Trie.Undo()
// Reset all nested states
for _, stateObject := range s.stateObjects {
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 {
//s.UpdateStateObject(stateObject)
if stateObject.State == nil {
continue
}
stateObject.State.Sync()
}
s.Trie.Sync()
s.Empty()
}
func (self *State) Empty() {
self.stateObjects = make(map[string]*StateObject)
}
func (self *State) Update() {
for _, stateObject := range self.stateObjects {
if stateObject.remove {
self.DeleteStateObject(stateObject)
} else {
stateObject.Sync()
self.UpdateStateObject(stateObject)
}
}
// FIXME trie delete is broken
valid, t2 := ethtrie.ParanoiaCheck(self.Trie)
if !valid {
statelogger.Infof("Warn: PARANOIA: Different state root during copy %x vs %x\n", self.Trie.Root, t2.Root)
self.Trie = t2
}
}
func (self *State) Manifest() *Manifest {
return self.manifest
}
// Debug stuff
func (self *State) CreateOutputForDiff() {
for _, stateObject := range self.stateObjects {
stateObject.CreateOutputForDiff()
}
}
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