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package ethchain
import (
"github.com/ethereum/eth-go/ethcrypto"
"github.com/ethereum/eth-go/ethtrie"
"github.com/ethereum/eth-go/ethutil"
"math/big"
)
// 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 NewState(trie *ethtrie.Trie) *State {
return &State{trie: trie, stateObjects: make(map[string]*StateObject), manifest: NewManifest()}
}
// 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()
}
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.trie.Delete(string(stateObject.Address()))
} else {
self.UpdateStateObject(stateObject)
}
}
}
// Purges the current trie.
func (s *State) Purge() int {
return s.trie.NewIterator().Purge()
}
func (s *State) EachStorage(cb ethtrie.EachCallback) {
it := s.trie.NewIterator()
it.Each(cb)
}
func (self *State) ResetStateObject(stateObject *StateObject) {
delete(self.stateObjects, string(stateObject.Address()))
stateObject.state.Reset()
}
func (self *State) UpdateStateObject(stateObject *StateObject) {
addr := stateObject.Address()
ethutil.Config.Db.Put(ethcrypto.Sha3Bin(stateObject.Script()), stateObject.Script())
self.trie.Update(string(addr), string(stateObject.RlpEncode()))
self.manifest.AddObjectChange(stateObject)
}
func (self *State) GetStateObject(addr []byte) *StateObject {
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
}
func (self *State) GetOrNewStateObject(addr []byte) *StateObject {
stateObject := self.GetStateObject(addr)
if stateObject == nil {
stateObject = self.NewStateObject(addr)
}
return stateObject
}
func (self *State) NewStateObject(addr []byte) *StateObject {
statelogger.Infof("(+) %x\n", addr)
stateObject := NewStateObject(addr)
self.stateObjects[string(addr)] = stateObject
return stateObject
}
func (self *State) GetAccount(addr []byte) *StateObject {
return self.GetOrNewStateObject(addr)
}
func (s *State) Cmp(other *State) bool {
return s.trie.Cmp(other.trie)
}
func (self *State) Copy() *State {
if self.trie != nil {
state := NewState(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 = *state
}
func (s *State) Put(key, object []byte) {
s.trie.Update(string(key), string(object))
}
func (s *State) Root() interface{} {
return s.trie.Root
}
// Object manifest
//
// The object manifest is used to keep changes to the state so we can keep track of the changes
// that occurred during a state transitioning phase.
type Manifest struct {
// XXX These will be handy in the future. Not important for now.
objectAddresses map[string]bool
storageAddresses map[string]map[string]bool
objectChanges map[string]*StateObject
storageChanges map[string]map[string]*big.Int
}
func NewManifest() *Manifest {
m := &Manifest{objectAddresses: make(map[string]bool), storageAddresses: make(map[string]map[string]bool)}
m.Reset()
return m
}
func (m *Manifest) Reset() {
m.objectChanges = make(map[string]*StateObject)
m.storageChanges = make(map[string]map[string]*big.Int)
}
func (m *Manifest) AddObjectChange(stateObject *StateObject) {
m.objectChanges[string(stateObject.Address())] = stateObject
}
func (m *Manifest) AddStorageChange(stateObject *StateObject, storageAddr []byte, storage *big.Int) {
if m.storageChanges[string(stateObject.Address())] == nil {
m.storageChanges[string(stateObject.Address())] = make(map[string]*big.Int)
}
m.storageChanges[string(stateObject.Address())][string(storageAddr)] = storage
}
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