156 lines
3.7 KiB
Go
156 lines
3.7 KiB
Go
package ethchain
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import (
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"github.com/ethereum/eth-go/ethutil"
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"math/big"
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)
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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 *ethutil.Trie
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// Nested states
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states map[string]*State
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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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func NewState(trie *ethutil.Trie) *State {
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return &State{trie: trie, states: make(map[string]*State), manifest: NewManifest()}
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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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// Reset all nested states
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for _, state := range s.states {
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state.Reset()
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}
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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 _, state := range s.states {
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state.Sync()
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}
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s.trie.Sync()
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}
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// Purges the current trie.
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func (s *State) Purge() int {
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return s.trie.NewIterator().Purge()
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}
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func (s *State) GetStateObject(addr []byte) *StateObject {
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data := s.trie.Get(string(addr))
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if data == "" {
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return nil
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}
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stateObject := NewStateObjectFromBytes(addr, []byte(data))
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// Check if there's a cached state for this contract
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cachedStateObject := s.states[string(addr)]
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if cachedStateObject != nil {
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stateObject.state = cachedStateObject
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} else {
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// If it isn't cached, cache the state
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s.states[string(addr)] = stateObject.state
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}
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return stateObject
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}
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// Updates any given state object
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func (s *State) UpdateStateObject(object *StateObject) {
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addr := object.Address()
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if object.state != nil {
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s.states[string(addr)] = object.state
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}
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ethutil.Config.Db.Put(ethutil.Sha3Bin(object.Script()), object.Script())
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s.trie.Update(string(addr), string(object.RlpEncode()))
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s.manifest.AddObjectChange(object)
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}
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func (s *State) SetStateObject(stateObject *StateObject) {
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s.states[string(stateObject.address)] = stateObject.state
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s.UpdateStateObject(stateObject)
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}
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func (s *State) GetAccount(addr []byte) (account *StateObject) {
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data := s.trie.Get(string(addr))
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if data == "" {
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account = NewAccount(addr, big.NewInt(0))
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} else {
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account = NewStateObjectFromBytes(addr, []byte(data))
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}
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return
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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 (s *State) Copy() *State {
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return NewState(s.trie.Copy())
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}
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func (s *State) Put(key, object []byte) {
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s.trie.Update(string(key), string(object))
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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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// Object manifest
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//
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// The object manifest is used to keep changes to the state so we can keep track of the changes
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// that occurred during a state transitioning phase.
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type Manifest struct {
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// XXX These will be handy in the future. Not important for now.
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objectAddresses map[string]bool
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storageAddresses map[string]map[string]bool
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objectChanges map[string]*StateObject
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storageChanges map[string]map[string]*big.Int
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}
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func NewManifest() *Manifest {
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m := &Manifest{objectAddresses: make(map[string]bool), storageAddresses: make(map[string]map[string]bool)}
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m.Reset()
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return m
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}
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func (m *Manifest) Reset() {
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m.objectChanges = make(map[string]*StateObject)
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m.storageChanges = make(map[string]map[string]*big.Int)
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}
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func (m *Manifest) AddObjectChange(stateObject *StateObject) {
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m.objectChanges[string(stateObject.Address())] = stateObject
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}
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func (m *Manifest) AddStorageChange(stateObject *StateObject, storageAddr []byte, storage *big.Int) {
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if m.storageChanges[string(stateObject.Address())] == nil {
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m.storageChanges[string(stateObject.Address())] = make(map[string]*big.Int)
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}
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m.storageChanges[string(stateObject.Address())][string(storageAddr)] = storage
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}
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