2014-07-22 09:54:48 +00:00
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package ethstate
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import (
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2014-07-29 22:31:15 +00:00
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"math/big"
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2014-07-22 09:54:48 +00:00
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"github.com/ethereum/eth-go/ethlog"
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"github.com/ethereum/eth-go/ethtrie"
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"github.com/ethereum/eth-go/ethutil"
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)
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var statelogger = ethlog.NewLogger("STATE")
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// States within the ethereum protocol are used to store anything
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// within the merkle trie. States 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 State struct {
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// The trie for this structure
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Trie *ethtrie.Trie
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2014-07-22 09:54:48 +00:00
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stateObjects map[string]*StateObject
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manifest *Manifest
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}
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// Create a new state from a given trie
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2014-08-04 08:42:40 +00:00
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func New(trie *ethtrie.Trie) *State {
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return &State{Trie: trie, stateObjects: make(map[string]*StateObject), manifest: NewManifest()}
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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 *State) GetBalance(addr []byte) *big.Int {
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stateObject := self.GetStateObject(addr)
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if stateObject != nil {
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2014-07-29 22:31:15 +00:00
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return stateObject.Balance
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2014-07-22 09:54:48 +00:00
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}
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return ethutil.Big0
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}
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func (self *State) GetNonce(addr []byte) uint64 {
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stateObject := self.GetStateObject(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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2014-09-07 22:50:04 +00:00
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func (self *State) GetCode(addr []byte) []byte {
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stateObject := self.GetStateObject(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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2014-07-22 09:54:48 +00:00
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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 *State) UpdateStateObject(stateObject *StateObject) {
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addr := stateObject.Address()
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2014-09-15 13:42:12 +00:00
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if len(stateObject.CodeHash()) > 0 {
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ethutil.Config.Db.Put(stateObject.CodeHash(), stateObject.Code)
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}
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2014-07-24 10:04:15 +00:00
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self.Trie.Update(string(addr), string(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 *State) DeleteStateObject(stateObject *StateObject) {
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self.Trie.Delete(string(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 *State) 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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2014-07-24 10:04:15 +00:00
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data := self.Trie.Get(string(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))
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self.stateObjects[string(addr)] = stateObject
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return stateObject
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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 *State) 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 *State) NewStateObject(addr []byte) *StateObject {
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addr = ethutil.Address(addr)
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2014-08-22 08:58:49 +00:00
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statelogger.Debugf("(+) %x\n", addr)
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2014-07-22 09:54:48 +00:00
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stateObject := NewStateObject(addr)
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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 *State) 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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func (s *State) Cmp(other *State) bool {
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return s.Trie.Cmp(other.Trie)
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}
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func (self *State) Copy() *State {
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if self.Trie != nil {
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state := New(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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return state
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}
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return nil
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}
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func (self *State) Set(state *State) {
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if state == nil {
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panic("Tried setting 'state' to nil through 'Set'")
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}
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2014-07-24 10:04:15 +00:00
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self.Trie = state.Trie
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2014-07-22 09:54:48 +00:00
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self.stateObjects = state.stateObjects
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}
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func (s *State) Root() interface{} {
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return s.Trie.Root
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}
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// Resets the trie and all siblings
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func (s *State) Reset() {
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s.Trie.Undo()
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2014-07-22 09:54:48 +00:00
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// Reset all nested states
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for _, stateObject := range s.stateObjects {
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2014-07-24 10:04:15 +00:00
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if stateObject.State == nil {
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2014-07-22 09:54:48 +00:00
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continue
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}
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//stateObject.state.Reset()
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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 *State) Sync() {
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// Sync all nested states
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for _, stateObject := range s.stateObjects {
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2014-07-24 10:04:15 +00:00
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if stateObject.State == nil {
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2014-07-22 09:54:48 +00:00
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continue
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}
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2014-07-24 10:04:15 +00:00
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stateObject.State.Sync()
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}
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2014-07-24 10:04:15 +00:00
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s.Trie.Sync()
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2014-07-22 09:54:48 +00:00
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s.Empty()
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}
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func (self *State) Empty() {
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self.stateObjects = make(map[string]*StateObject)
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}
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func (self *State) Update() {
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2014-10-08 09:59:44 +00:00
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var deleted bool
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2014-07-22 09:54:48 +00:00
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for _, stateObject := range self.stateObjects {
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if stateObject.remove {
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self.DeleteStateObject(stateObject)
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2014-10-08 09:59:44 +00:00
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deleted = true
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} else {
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stateObject.Sync()
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self.UpdateStateObject(stateObject)
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}
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}
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// FIXME trie delete is broken
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2014-10-08 09:59:44 +00:00
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if deleted {
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valid, t2 := ethtrie.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.Root, t2.Root)
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2014-07-22 09:54:48 +00:00
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2014-10-08 09:59:44 +00:00
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self.Trie = t2
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}
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2014-07-22 09:54:48 +00:00
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}
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}
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func (self *State) Manifest() *Manifest {
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return self.manifest
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}
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2014-08-11 14:23:38 +00:00
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// Debug stuff
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func (self *State) CreateOutputForDiff() {
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for _, stateObject := range self.stateObjects {
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stateObject.CreateOutputForDiff()
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2014-07-22 09:54:48 +00:00
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}
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}
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