280 lines
9.2 KiB
Go
280 lines
9.2 KiB
Go
// Copyright 2016 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package light
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/core/vm"
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/params"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
// VMEnv is the light client version of the vm execution environment.
|
|
// Unlike other structures, VMEnv holds a context that is applied by state
|
|
// retrieval requests through the entire execution. If any state operation
|
|
// returns an error, the execution fails.
|
|
type VMEnv struct {
|
|
vm.Environment
|
|
ctx context.Context
|
|
chainConfig *params.ChainConfig
|
|
evm *vm.EVM
|
|
state *VMState
|
|
header *types.Header
|
|
msg core.Message
|
|
depth int
|
|
chain *LightChain
|
|
err error
|
|
}
|
|
|
|
// NewEnv creates a new execution environment based on an ODR capable light state
|
|
func NewEnv(ctx context.Context, state *LightState, chainConfig *params.ChainConfig, chain *LightChain, msg core.Message, header *types.Header, cfg vm.Config) *VMEnv {
|
|
env := &VMEnv{
|
|
chainConfig: chainConfig,
|
|
chain: chain,
|
|
header: header,
|
|
msg: msg,
|
|
}
|
|
env.state = &VMState{ctx: ctx, state: state, env: env}
|
|
|
|
env.evm = vm.New(env, cfg)
|
|
return env
|
|
}
|
|
|
|
func (self *VMEnv) ChainConfig() *params.ChainConfig { return self.chainConfig }
|
|
func (self *VMEnv) Vm() vm.Vm { return self.evm }
|
|
func (self *VMEnv) Origin() common.Address { return self.msg.From() }
|
|
func (self *VMEnv) BlockNumber() *big.Int { return self.header.Number }
|
|
func (self *VMEnv) Coinbase() common.Address { return self.header.Coinbase }
|
|
func (self *VMEnv) Time() *big.Int { return self.header.Time }
|
|
func (self *VMEnv) Difficulty() *big.Int { return self.header.Difficulty }
|
|
func (self *VMEnv) GasLimit() *big.Int { return self.header.GasLimit }
|
|
func (self *VMEnv) Db() vm.Database { return self.state }
|
|
func (self *VMEnv) Depth() int { return self.depth }
|
|
func (self *VMEnv) SetDepth(i int) { self.depth = i }
|
|
func (self *VMEnv) GetHash(n uint64) common.Hash {
|
|
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) {
|
|
if header.Number.Uint64() == n {
|
|
return header.Hash()
|
|
}
|
|
}
|
|
|
|
return common.Hash{}
|
|
}
|
|
|
|
func (self *VMEnv) AddLog(log *vm.Log) {
|
|
//self.state.AddLog(log)
|
|
}
|
|
func (self *VMEnv) CanTransfer(from common.Address, balance *big.Int) bool {
|
|
return self.state.GetBalance(from).Cmp(balance) >= 0
|
|
}
|
|
|
|
func (self *VMEnv) SnapshotDatabase() int {
|
|
return self.state.SnapshotDatabase()
|
|
}
|
|
|
|
func (self *VMEnv) RevertToSnapshot(idx int) {
|
|
self.state.RevertToSnapshot(idx)
|
|
}
|
|
|
|
func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) {
|
|
core.Transfer(from, to, amount)
|
|
}
|
|
|
|
func (self *VMEnv) Call(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
|
|
return core.Call(self, me, addr, data, gas, price, value)
|
|
}
|
|
func (self *VMEnv) CallCode(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
|
|
return core.CallCode(self, me, addr, data, gas, price, value)
|
|
}
|
|
|
|
func (self *VMEnv) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
|
|
return core.DelegateCall(self, me, addr, data, gas, price)
|
|
}
|
|
|
|
func (self *VMEnv) Create(me vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
|
|
return core.Create(self, me, data, gas, price, value)
|
|
}
|
|
|
|
// Error returns the error (if any) that happened during execution.
|
|
func (self *VMEnv) Error() error {
|
|
return self.err
|
|
}
|
|
|
|
// VMState is a wrapper for the light state that holds the actual context and
|
|
// passes it to any state operation that requires it.
|
|
type VMState struct {
|
|
vm.Database
|
|
ctx context.Context
|
|
state *LightState
|
|
snapshots []*LightState
|
|
env *VMEnv
|
|
}
|
|
|
|
// errHandler handles and stores any state error that happens during execution.
|
|
func (s *VMState) errHandler(err error) {
|
|
if err != nil && s.env.err == nil {
|
|
s.env.err = err
|
|
}
|
|
}
|
|
|
|
func (self *VMState) SnapshotDatabase() int {
|
|
self.snapshots = append(self.snapshots, self.state.Copy())
|
|
return len(self.snapshots) - 1
|
|
}
|
|
|
|
func (self *VMState) RevertToSnapshot(idx int) {
|
|
self.state.Set(self.snapshots[idx])
|
|
self.snapshots = self.snapshots[:idx]
|
|
}
|
|
|
|
// GetAccount returns the account object of the given account or nil if the
|
|
// account does not exist
|
|
func (s *VMState) GetAccount(addr common.Address) vm.Account {
|
|
so, err := s.state.GetStateObject(s.ctx, addr)
|
|
s.errHandler(err)
|
|
if err != nil {
|
|
// return a dummy state object to avoid panics
|
|
so = s.state.newStateObject(addr)
|
|
}
|
|
return so
|
|
}
|
|
|
|
// CreateAccount creates creates a new account object and takes ownership.
|
|
func (s *VMState) CreateAccount(addr common.Address) vm.Account {
|
|
so, err := s.state.CreateStateObject(s.ctx, addr)
|
|
s.errHandler(err)
|
|
if err != nil {
|
|
// return a dummy state object to avoid panics
|
|
so = s.state.newStateObject(addr)
|
|
}
|
|
return so
|
|
}
|
|
|
|
// AddBalance adds the given amount to the balance of the specified account
|
|
func (s *VMState) AddBalance(addr common.Address, amount *big.Int) {
|
|
err := s.state.AddBalance(s.ctx, addr, amount)
|
|
s.errHandler(err)
|
|
}
|
|
|
|
// GetBalance retrieves the balance from the given address or 0 if the account does
|
|
// not exist
|
|
func (s *VMState) GetBalance(addr common.Address) *big.Int {
|
|
res, err := s.state.GetBalance(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|
|
|
|
// GetNonce returns the nonce at the given address or 0 if the account does
|
|
// not exist
|
|
func (s *VMState) GetNonce(addr common.Address) uint64 {
|
|
res, err := s.state.GetNonce(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|
|
|
|
// SetNonce sets the nonce of the specified account
|
|
func (s *VMState) SetNonce(addr common.Address, nonce uint64) {
|
|
err := s.state.SetNonce(s.ctx, addr, nonce)
|
|
s.errHandler(err)
|
|
}
|
|
|
|
// GetCode returns the contract code at the given address or nil if the account
|
|
// does not exist
|
|
func (s *VMState) GetCode(addr common.Address) []byte {
|
|
res, err := s.state.GetCode(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|
|
|
|
// GetCodeHash returns the contract code hash at the given address
|
|
func (s *VMState) GetCodeHash(addr common.Address) common.Hash {
|
|
res, err := s.state.GetCode(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return crypto.Keccak256Hash(res)
|
|
}
|
|
|
|
// GetCodeSize returns the contract code size at the given address
|
|
func (s *VMState) GetCodeSize(addr common.Address) int {
|
|
res, err := s.state.GetCode(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return len(res)
|
|
}
|
|
|
|
// SetCode sets the contract code at the specified account
|
|
func (s *VMState) SetCode(addr common.Address, code []byte) {
|
|
err := s.state.SetCode(s.ctx, addr, code)
|
|
s.errHandler(err)
|
|
}
|
|
|
|
// AddRefund adds an amount to the refund value collected during a vm execution
|
|
func (s *VMState) AddRefund(gas *big.Int) {
|
|
s.state.AddRefund(gas)
|
|
}
|
|
|
|
// GetRefund returns the refund value collected during a vm execution
|
|
func (s *VMState) GetRefund() *big.Int {
|
|
return s.state.GetRefund()
|
|
}
|
|
|
|
// GetState returns the contract storage value at storage address b from the
|
|
// contract address a or common.Hash{} if the account does not exist
|
|
func (s *VMState) GetState(a common.Address, b common.Hash) common.Hash {
|
|
res, err := s.state.GetState(s.ctx, a, b)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|
|
|
|
// SetState sets the storage value at storage address key of the account addr
|
|
func (s *VMState) SetState(addr common.Address, key common.Hash, value common.Hash) {
|
|
err := s.state.SetState(s.ctx, addr, key, value)
|
|
s.errHandler(err)
|
|
}
|
|
|
|
// Suicide marks an account to be removed and clears its balance
|
|
func (s *VMState) Suicide(addr common.Address) bool {
|
|
res, err := s.state.Suicide(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|
|
|
|
// Exist returns true if an account exists at the given address
|
|
func (s *VMState) Exist(addr common.Address) bool {
|
|
res, err := s.state.HasAccount(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|
|
|
|
// Empty returns true if the account at the given address is considered empty
|
|
func (s *VMState) Empty(addr common.Address) bool {
|
|
so, err := s.state.GetStateObject(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return so == nil || so.empty()
|
|
}
|
|
|
|
// HasSuicided returns true if the given account has been marked for deletion
|
|
// or false if the account does not exist
|
|
func (s *VMState) HasSuicided(addr common.Address) bool {
|
|
res, err := s.state.HasSuicided(s.ctx, addr)
|
|
s.errHandler(err)
|
|
return res
|
|
}
|