295 lines
7.2 KiB
Go
295 lines
7.2 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package state
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import (
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"bytes"
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"fmt"
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"io"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/trie"
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)
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var emptyCodeHash = crypto.Keccak256(nil)
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type Code []byte
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func (self Code) String() string {
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return string(self) //strings.Join(Disassemble(self), " ")
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}
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type Storage map[common.Hash]common.Hash
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func (self Storage) String() (str string) {
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for key, value := range self {
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str += fmt.Sprintf("%X : %X\n", key, value)
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}
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return
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}
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func (self Storage) Copy() Storage {
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cpy := make(Storage)
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for key, value := range self {
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cpy[key] = value
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}
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return cpy
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}
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type StateObject struct {
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db trie.Database // State database for storing state changes
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trie *trie.SecureTrie
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// Address belonging to this account
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address common.Address
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// The balance of the account
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balance *big.Int
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// The nonce of the account
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nonce uint64
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// The code hash if code is present (i.e. a contract)
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codeHash []byte
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// The code for this account
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code Code
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// Cached storage (flushed when updated)
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storage Storage
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// Mark for deletion
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// When an object is marked for deletion it will be delete from the trie
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// during the "update" phase of the state transition
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remove bool
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deleted bool
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dirty bool
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}
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func NewStateObject(address common.Address, db trie.Database) *StateObject {
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object := &StateObject{
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db: db,
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address: address,
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balance: new(big.Int),
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dirty: true,
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codeHash: emptyCodeHash,
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storage: make(Storage),
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}
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object.trie, _ = trie.NewSecure(common.Hash{}, db)
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return object
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}
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func (self *StateObject) MarkForDeletion() {
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self.remove = true
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self.dirty = true
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if glog.V(logger.Core) {
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glog.Infof("%x: #%d %v X\n", self.Address(), self.nonce, self.balance)
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}
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}
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func (c *StateObject) getAddr(addr common.Hash) common.Hash {
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var ret []byte
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rlp.DecodeBytes(c.trie.Get(addr[:]), &ret)
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return common.BytesToHash(ret)
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}
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func (c *StateObject) setAddr(addr, value common.Hash) {
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v, err := rlp.EncodeToBytes(bytes.TrimLeft(value[:], "\x00"))
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if err != nil {
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// if RLPing failed we better panic and not fail silently. This would be considered a consensus issue
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panic(err)
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}
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c.trie.Update(addr[:], v)
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}
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func (self *StateObject) Storage() Storage {
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return self.storage
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}
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func (self *StateObject) GetState(key common.Hash) common.Hash {
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value, exists := self.storage[key]
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if !exists {
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value = self.getAddr(key)
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if (value != common.Hash{}) {
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self.storage[key] = value
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}
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}
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return value
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}
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func (self *StateObject) SetState(key, value common.Hash) {
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self.storage[key] = value
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self.dirty = true
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}
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// Update updates the current cached storage to the trie
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func (self *StateObject) Update() {
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for key, value := range self.storage {
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if (value == common.Hash{}) {
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self.trie.Delete(key[:])
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continue
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}
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self.setAddr(key, value)
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}
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}
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func (c *StateObject) AddBalance(amount *big.Int) {
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c.SetBalance(new(big.Int).Add(c.balance, amount))
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if glog.V(logger.Core) {
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glog.Infof("%x: #%d %v (+ %v)\n", c.Address(), c.nonce, c.balance, amount)
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}
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}
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func (c *StateObject) SubBalance(amount *big.Int) {
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c.SetBalance(new(big.Int).Sub(c.balance, amount))
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if glog.V(logger.Core) {
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glog.Infof("%x: #%d %v (- %v)\n", c.Address(), c.nonce, c.balance, amount)
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}
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}
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func (c *StateObject) SetBalance(amount *big.Int) {
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c.balance = amount
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c.dirty = true
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}
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func (c *StateObject) St() Storage {
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return c.storage
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}
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// Return the gas back to the origin. Used by the Virtual machine or Closures
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func (c *StateObject) ReturnGas(gas, price *big.Int) {}
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func (self *StateObject) Copy() *StateObject {
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stateObject := NewStateObject(self.Address(), self.db)
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stateObject.balance.Set(self.balance)
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stateObject.codeHash = common.CopyBytes(self.codeHash)
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stateObject.nonce = self.nonce
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stateObject.trie = self.trie
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stateObject.code = self.code
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stateObject.storage = self.storage.Copy()
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stateObject.remove = self.remove
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stateObject.dirty = self.dirty
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stateObject.deleted = self.deleted
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return stateObject
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}
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//
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// Attribute accessors
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//
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func (self *StateObject) Balance() *big.Int {
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return self.balance
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}
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// Returns the address of the contract/account
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func (c *StateObject) Address() common.Address {
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return c.address
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}
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func (self *StateObject) Trie() *trie.SecureTrie {
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return self.trie
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}
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func (self *StateObject) Root() []byte {
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return self.trie.Root()
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}
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func (self *StateObject) Code() []byte {
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return self.code
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}
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func (self *StateObject) SetCode(code []byte) {
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self.code = code
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self.codeHash = crypto.Keccak256(code)
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self.dirty = true
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}
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func (self *StateObject) SetNonce(nonce uint64) {
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self.nonce = nonce
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self.dirty = true
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}
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func (self *StateObject) Nonce() uint64 {
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return self.nonce
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}
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// Never called, but must be present to allow StateObject to be used
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// as a vm.Account interface that also satisfies the vm.ContractRef
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// interface. Interfaces are awesome.
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func (self *StateObject) Value() *big.Int {
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panic("Value on StateObject should never be called")
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}
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func (self *StateObject) ForEachStorage(cb func(key, value common.Hash) bool) {
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// When iterating over the storage check the cache first
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for h, value := range self.storage {
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cb(h, value)
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}
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it := self.trie.Iterator()
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for it.Next() {
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// ignore cached values
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key := common.BytesToHash(self.trie.GetKey(it.Key))
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if _, ok := self.storage[key]; !ok {
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cb(key, common.BytesToHash(it.Value))
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}
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}
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}
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type extStateObject struct {
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Nonce uint64
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Balance *big.Int
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Root common.Hash
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CodeHash []byte
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}
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// EncodeRLP implements rlp.Encoder.
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func (c *StateObject) EncodeRLP(w io.Writer) error {
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return rlp.Encode(w, []interface{}{c.nonce, c.balance, c.Root(), c.codeHash})
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}
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// DecodeObject decodes an RLP-encoded state object.
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func DecodeObject(address common.Address, db trie.Database, data []byte) (*StateObject, error) {
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var (
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obj = &StateObject{address: address, db: db, storage: make(Storage)}
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ext extStateObject
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err error
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)
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if err = rlp.DecodeBytes(data, &ext); err != nil {
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return nil, err
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}
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if obj.trie, err = trie.NewSecure(ext.Root, db); err != nil {
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return nil, err
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}
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if !bytes.Equal(ext.CodeHash, emptyCodeHash) {
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if obj.code, err = db.Get(ext.CodeHash); err != nil {
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return nil, fmt.Errorf("can't get code for hash %x: %v", ext.CodeHash, err)
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}
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}
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obj.nonce = ext.Nonce
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obj.balance = ext.Balance
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obj.codeHash = ext.CodeHash
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return obj, nil
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}
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