272 lines
8.9 KiB
Go
272 lines
8.9 KiB
Go
// Copyright 2016 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/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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"golang.org/x/net/context"
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)
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// VMEnv is the light client version of the vm execution environment.
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// Unlike other structures, VMEnv holds a context that is applied by state
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// retrieval requests through the entire execution. If any state operation
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// returns an error, the execution fails.
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type VMEnv struct {
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vm.Environment
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ctx context.Context
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chainConfig *core.ChainConfig
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evm *vm.EVM
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state *VMState
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header *types.Header
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msg core.Message
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depth int
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chain *LightChain
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err error
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}
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// NewEnv creates a new execution environment based on an ODR capable light state
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func NewEnv(ctx context.Context, state *LightState, chainConfig *core.ChainConfig, chain *LightChain, msg core.Message, header *types.Header, cfg vm.Config) *VMEnv {
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env := &VMEnv{
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chainConfig: chainConfig,
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chain: chain,
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header: header,
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msg: msg,
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}
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env.state = &VMState{ctx: ctx, state: state, env: env}
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env.evm = vm.New(env, cfg)
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return env
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}
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func (self *VMEnv) RuleSet() vm.RuleSet { return self.chainConfig }
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func (self *VMEnv) Vm() vm.Vm { return self.evm }
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func (self *VMEnv) Origin() common.Address { f, _ := self.msg.From(); return f }
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func (self *VMEnv) BlockNumber() *big.Int { return self.header.Number }
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func (self *VMEnv) Coinbase() common.Address { return self.header.Coinbase }
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func (self *VMEnv) Time() *big.Int { return self.header.Time }
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func (self *VMEnv) Difficulty() *big.Int { return self.header.Difficulty }
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func (self *VMEnv) GasLimit() *big.Int { return self.header.GasLimit }
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func (self *VMEnv) Db() vm.Database { return self.state }
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func (self *VMEnv) Depth() int { return self.depth }
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func (self *VMEnv) SetDepth(i int) { self.depth = i }
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func (self *VMEnv) GetHash(n uint64) common.Hash {
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for header := self.chain.GetHeader(self.header.ParentHash, self.header.Number.Uint64()-1); header != nil; header = self.chain.GetHeader(header.ParentHash, header.Number.Uint64()-1) {
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if header.Number.Uint64() == n {
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return header.Hash()
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}
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}
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return common.Hash{}
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}
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func (self *VMEnv) AddLog(log *vm.Log) {
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//self.state.AddLog(log)
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}
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func (self *VMEnv) CanTransfer(from common.Address, balance *big.Int) bool {
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return self.state.GetBalance(from).Cmp(balance) >= 0
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}
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func (self *VMEnv) SnapshotDatabase() int {
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return self.state.SnapshotDatabase()
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}
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func (self *VMEnv) RevertToSnapshot(idx int) {
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self.state.RevertToSnapshot(idx)
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}
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func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) {
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core.Transfer(from, to, amount)
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}
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func (self *VMEnv) Call(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return core.Call(self, me, addr, data, gas, price, value)
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}
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func (self *VMEnv) CallCode(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return core.CallCode(self, me, addr, data, gas, price, value)
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}
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func (self *VMEnv) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
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return core.DelegateCall(self, me, addr, data, gas, price)
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}
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func (self *VMEnv) Create(me vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
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return core.Create(self, me, data, gas, price, value)
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}
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// Error returns the error (if any) that happened during execution.
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func (self *VMEnv) Error() error {
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return self.err
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}
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// VMState is a wrapper for the light state that holds the actual context and
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// passes it to any state operation that requires it.
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type VMState struct {
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vm.Database
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ctx context.Context
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state *LightState
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snapshots []*LightState
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env *VMEnv
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}
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// errHandler handles and stores any state error that happens during execution.
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func (s *VMState) errHandler(err error) {
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if err != nil && s.env.err == nil {
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s.env.err = err
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}
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}
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func (self *VMState) SnapshotDatabase() int {
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self.snapshots = append(self.snapshots, self.state.Copy())
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return len(self.snapshots) - 1
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}
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func (self *VMState) RevertToSnapshot(idx int) {
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self.state.Set(self.snapshots[idx])
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self.snapshots = self.snapshots[:idx]
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}
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// GetAccount returns the account object of the given account or nil if the
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// account does not exist
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func (s *VMState) GetAccount(addr common.Address) vm.Account {
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so, err := s.state.GetStateObject(s.ctx, addr)
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s.errHandler(err)
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if err != nil {
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// return a dummy state object to avoid panics
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so = s.state.newStateObject(addr)
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}
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return so
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}
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// CreateAccount creates creates a new account object and takes ownership.
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func (s *VMState) CreateAccount(addr common.Address) vm.Account {
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so, err := s.state.CreateStateObject(s.ctx, addr)
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s.errHandler(err)
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if err != nil {
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// return a dummy state object to avoid panics
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so = s.state.newStateObject(addr)
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}
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return so
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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 (s *VMState) AddBalance(addr common.Address, amount *big.Int) {
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err := s.state.AddBalance(s.ctx, addr, amount)
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s.errHandler(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 (s *VMState) GetBalance(addr common.Address) *big.Int {
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res, err := s.state.GetBalance(s.ctx, addr)
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s.errHandler(err)
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return res
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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 (s *VMState) GetNonce(addr common.Address) uint64 {
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res, err := s.state.GetNonce(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// SetNonce sets the nonce of the specified account
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func (s *VMState) SetNonce(addr common.Address, nonce uint64) {
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err := s.state.SetNonce(s.ctx, addr, nonce)
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s.errHandler(err)
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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 (s *VMState) GetCode(addr common.Address) []byte {
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res, err := s.state.GetCode(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// GetCodeHash returns the contract code hash at the given address
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func (s *VMState) GetCodeHash(addr common.Address) common.Hash {
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res, err := s.state.GetCode(s.ctx, addr)
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s.errHandler(err)
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return crypto.Keccak256Hash(res)
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}
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// GetCodeSize returns the contract code size at the given address
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func (s *VMState) GetCodeSize(addr common.Address) int {
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res, err := s.state.GetCode(s.ctx, addr)
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s.errHandler(err)
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return len(res)
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}
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// SetCode sets the contract code at the specified account
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func (s *VMState) SetCode(addr common.Address, code []byte) {
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err := s.state.SetCode(s.ctx, addr, code)
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s.errHandler(err)
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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 (s *VMState) AddRefund(gas *big.Int) {
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s.state.AddRefund(gas)
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}
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// GetRefund returns the refund value collected during a vm execution
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func (s *VMState) GetRefund() *big.Int {
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return s.state.GetRefund()
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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 (s *VMState) GetState(a common.Address, b common.Hash) common.Hash {
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res, err := s.state.GetState(s.ctx, a, b)
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s.errHandler(err)
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return res
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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 (s *VMState) SetState(addr common.Address, key common.Hash, value common.Hash) {
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err := s.state.SetState(s.ctx, addr, key, value)
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s.errHandler(err)
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}
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// Suicide marks an account to be removed and clears its balance
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func (s *VMState) Suicide(addr common.Address) bool {
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res, err := s.state.Suicide(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// Exist returns true if an account exists at the given address
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func (s *VMState) Exist(addr common.Address) bool {
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res, err := s.state.HasAccount(s.ctx, addr)
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s.errHandler(err)
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return res
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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 (s *VMState) HasSuicided(addr common.Address) bool {
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res, err := s.state.HasSuicided(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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