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package ethchain
import (
"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 *ethutil.Trie
// Nested states
states map[string]*State
manifest *Manifest
}
// Create a new state from a given trie
func NewState(trie *ethutil.Trie) *State {
return &State{trie: trie, states: make(map[string]*State), manifest: NewManifest()}
}
// Resets the trie and all siblings
func (s *State) Reset() {
s.trie.Undo()
// Reset all nested states
for _, state := range s.states {
state.Reset()
}
}
// Syncs the trie and all siblings
func (s *State) Sync() {
// Sync all nested states
for _, state := range s.states {
state.Sync()
}
s.trie.Sync()
}
// Purges the current trie.
func (s *State) Purge() int {
return s.trie.NewIterator().Purge()
}
func (s *State) GetStateObject(addr []byte) *StateObject {
data := s.trie.Get(string(addr))
if data == "" {
return nil
}
stateObject := NewStateObjectFromBytes(addr, []byte(data))
// Check if there's a cached state for this contract
cachedStateObject := s.states[string(addr)]
if cachedStateObject != nil {
stateObject.state = cachedStateObject
} else {
// If it isn't cached, cache the state
s.states[string(addr)] = stateObject.state
}
return stateObject
}
// Updates any given state object
func (s *State) UpdateStateObject(object *StateObject) {
addr := object.Address()
if object.state != nil {
s.states[string(addr)] = object.state
}
ethutil.Config.Db.Put(ethutil.Sha3Bin(object.Script()), object.Script())
s.trie.Update(string(addr), string(object.RlpEncode()))
s.manifest.AddObjectChange(object)
}
func (s *State) SetStateObject(stateObject *StateObject) {
s.states[string(stateObject.address)] = stateObject.state
s.UpdateStateObject(stateObject)
}
func (s *State) GetAccount(addr []byte) (account *StateObject) {
data := s.trie.Get(string(addr))
if data == "" {
account = NewAccount(addr, big.NewInt(0))
} else {
account = NewStateObjectFromBytes(addr, []byte(data))
}
return
}
func (s *State) Cmp(other *State) bool {
return s.trie.Cmp(other.trie)
}
func (s *State) Copy() *State {
return NewState(s.trie.Copy())
}
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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