303 lines
9.1 KiB
Go
303 lines
9.1 KiB
Go
// Copyright 2015 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 light
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import (
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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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"golang.org/x/net/context"
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)
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// LightState is a memory representation of a state.
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// This version is ODR capable, caching only the already accessed part of the
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// state, retrieving unknown parts on-demand from the ODR backend. Changes are
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// never stored in the local database, only in the memory objects.
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type LightState struct {
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odr OdrBackend
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trie *LightTrie
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id *TrieID
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stateObjects map[string]*StateObject
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refund *big.Int
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}
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// NewLightState creates a new LightState with the specified root.
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// Note that the creation of a light state is always successful, even if the
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// root is non-existent. In that case, ODR retrieval will always be unsuccessful
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// and every operation will return with an error or wait for the context to be
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// cancelled.
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func NewLightState(id *TrieID, odr OdrBackend) *LightState {
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var tr *LightTrie
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if id != nil {
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tr = NewLightTrie(id, odr, true)
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}
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return &LightState{
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odr: odr,
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trie: tr,
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id: id,
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stateObjects: make(map[string]*StateObject),
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refund: new(big.Int),
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}
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}
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// AddRefund adds an amount to the refund value collected during a vm execution
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func (self *LightState) AddRefund(gas *big.Int) {
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self.refund.Add(self.refund, gas)
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}
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// HasAccount returns true if an account exists at the given address
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func (self *LightState) HasAccount(ctx context.Context, addr common.Address) (bool, error) {
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so, err := self.GetStateObject(ctx, addr)
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return so != nil, err
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}
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// GetBalance retrieves the balance from the given address or 0 if the account does
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// not exist
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func (self *LightState) GetBalance(ctx context.Context, addr common.Address) (*big.Int, error) {
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stateObject, err := self.GetStateObject(ctx, addr)
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if err != nil {
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return common.Big0, err
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}
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if stateObject != nil {
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return stateObject.balance, nil
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}
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return common.Big0, nil
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}
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// GetNonce returns the nonce at the given address or 0 if the account does
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// not exist
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func (self *LightState) GetNonce(ctx context.Context, addr common.Address) (uint64, error) {
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stateObject, err := self.GetStateObject(ctx, addr)
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if err != nil {
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return 0, err
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}
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if stateObject != nil {
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return stateObject.nonce, nil
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}
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return 0, nil
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}
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// GetCode returns the contract code at the given address or nil if the account
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// does not exist
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func (self *LightState) GetCode(ctx context.Context, addr common.Address) ([]byte, error) {
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stateObject, err := self.GetStateObject(ctx, addr)
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if err != nil {
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return nil, err
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}
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if stateObject != nil {
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return stateObject.code, nil
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}
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return nil, nil
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}
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// GetState returns the contract storage value at storage address b from the
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// contract address a or common.Hash{} if the account does not exist
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func (self *LightState) GetState(ctx context.Context, a common.Address, b common.Hash) (common.Hash, error) {
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stateObject, err := self.GetStateObject(ctx, a)
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if err == nil && stateObject != nil {
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return stateObject.GetState(ctx, b)
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}
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return common.Hash{}, err
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}
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// HasSuicided returns true if the given account has been marked for deletion
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// or false if the account does not exist
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func (self *LightState) HasSuicided(ctx context.Context, addr common.Address) (bool, error) {
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stateObject, err := self.GetStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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return stateObject.remove, nil
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}
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return false, err
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}
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/*
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* SETTERS
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*/
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// AddBalance adds the given amount to the balance of the specified account
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func (self *LightState) AddBalance(ctx context.Context, addr common.Address, amount *big.Int) error {
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stateObject, err := self.GetOrNewStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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stateObject.AddBalance(amount)
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}
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return err
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}
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// SubBalance adds the given amount to the balance of the specified account
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func (self *LightState) SubBalance(ctx context.Context, addr common.Address, amount *big.Int) error {
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stateObject, err := self.GetOrNewStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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stateObject.SubBalance(amount)
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}
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return err
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}
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// SetNonce sets the nonce of the specified account
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func (self *LightState) SetNonce(ctx context.Context, addr common.Address, nonce uint64) error {
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stateObject, err := self.GetOrNewStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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stateObject.SetNonce(nonce)
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}
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return err
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}
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// SetCode sets the contract code at the specified account
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func (self *LightState) SetCode(ctx context.Context, addr common.Address, code []byte) error {
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stateObject, err := self.GetOrNewStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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stateObject.SetCode(crypto.Keccak256Hash(code), code)
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}
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return err
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}
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// SetState sets the storage value at storage address key of the account addr
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func (self *LightState) SetState(ctx context.Context, addr common.Address, key common.Hash, value common.Hash) error {
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stateObject, err := self.GetOrNewStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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stateObject.SetState(key, value)
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}
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return err
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}
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// Delete marks an account to be removed and clears its balance
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func (self *LightState) Suicide(ctx context.Context, addr common.Address) (bool, error) {
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stateObject, err := self.GetOrNewStateObject(ctx, addr)
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if err == nil && stateObject != nil {
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stateObject.MarkForDeletion()
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stateObject.balance = new(big.Int)
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return true, nil
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}
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return false, err
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}
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//
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// Get, set, new state object methods
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//
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// GetStateObject returns the state object of the given account or nil if the
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// account does not exist
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func (self *LightState) GetStateObject(ctx context.Context, addr common.Address) (stateObject *StateObject, err error) {
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stateObject = self.stateObjects[addr.Str()]
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if stateObject != nil {
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if stateObject.deleted {
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stateObject = nil
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}
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return stateObject, nil
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}
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data, err := self.trie.Get(ctx, addr[:])
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if err != nil {
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return nil, err
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}
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if len(data) == 0 {
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return nil, nil
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}
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stateObject, err = DecodeObject(ctx, self.id, addr, self.odr, []byte(data))
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if err != nil {
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return nil, err
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}
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self.SetStateObject(stateObject)
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return stateObject, nil
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}
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// SetStateObject sets the state object of the given account
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func (self *LightState) SetStateObject(object *StateObject) {
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self.stateObjects[object.Address().Str()] = object
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}
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// GetOrNewStateObject returns the state object of the given account or creates a
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// new one if the account does not exist
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func (self *LightState) GetOrNewStateObject(ctx context.Context, addr common.Address) (*StateObject, error) {
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stateObject, err := self.GetStateObject(ctx, addr)
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if err == nil && (stateObject == nil || stateObject.deleted) {
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stateObject, err = self.CreateStateObject(ctx, addr)
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}
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return stateObject, err
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}
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// newStateObject creates a state object whether it exists in the state or not
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func (self *LightState) newStateObject(addr common.Address) *StateObject {
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if glog.V(logger.Debug) {
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glog.Infof("(+) %x\n", addr)
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}
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stateObject := NewStateObject(addr, self.odr)
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self.stateObjects[addr.Str()] = stateObject
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return stateObject
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}
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// CreateStateObject creates creates a new state object and takes ownership.
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// This is different from "NewStateObject"
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func (self *LightState) CreateStateObject(ctx context.Context, addr common.Address) (*StateObject, error) {
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// Get previous (if any)
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so, err := self.GetStateObject(ctx, addr)
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if err != nil {
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return nil, err
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}
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// Create a new one
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newSo := self.newStateObject(addr)
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// If it existed set the balance to the new account
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if so != nil {
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newSo.balance = so.balance
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}
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return newSo, nil
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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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// Copy creates a copy of the state
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func (self *LightState) Copy() *LightState {
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// ignore error - we assume state-to-be-copied always exists
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state := NewLightState(nil, self.odr)
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state.trie = self.trie
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state.id = self.id
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for k, stateObject := range self.stateObjects {
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if stateObject.dirty {
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state.stateObjects[k] = stateObject.Copy()
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}
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}
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state.refund.Set(self.refund)
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return state
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}
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// Set copies the contents of the given state onto this state, overwriting
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// its contents
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func (self *LightState) Set(state *LightState) {
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self.trie = state.trie
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self.stateObjects = state.stateObjects
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self.refund = state.refund
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}
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// GetRefund returns the refund value collected during a vm execution
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func (self *LightState) GetRefund() *big.Int {
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return self.refund
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}
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