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package helper
import (
"errors"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
)
type Env struct {
depth int
state *state.StateDB
skipTransfer bool
initial bool
Gas *big.Int
origin common.Address
//parent common.Hash
coinbase common.Address
number *big.Int
time int64
difficulty *big.Int
gasLimit *big.Int
logs state.Logs
vmTest bool
}
func NewEnv(state *state.StateDB) *Env {
return &Env{
state: state,
}
}
func NewEnvFromMap(state *state.StateDB, envValues map[string]string, exeValues map[string]string) *Env {
env := NewEnv(state)
env.origin = common.HexToAddress(exeValues["caller"])
//env.parent = common.Hex2Bytes(envValues["previousHash"])
env.coinbase = common.HexToAddress(envValues["currentCoinbase"])
env.number = common.Big(envValues["currentNumber"])
env.time = common.Big(envValues["currentTimestamp"]).Int64()
env.difficulty = common.Big(envValues["currentDifficulty"])
env.gasLimit = common.Big(envValues["currentGasLimit"])
env.Gas = new(big.Int)
return env
}
func (self *Env) Origin() common.Address { return self.origin }
func (self *Env) BlockNumber() *big.Int { return self.number }
//func (self *Env) PrevHash() []byte { return self.parent }
func (self *Env) Coinbase() common.Address { return self.coinbase }
func (self *Env) Time() int64 { return self.time }
func (self *Env) Difficulty() *big.Int { return self.difficulty }
func (self *Env) State() *state.StateDB { return self.state }
func (self *Env) GasLimit() *big.Int { return self.gasLimit }
func (self *Env) VmType() vm.Type { return vm.StdVmTy }
func (self *Env) GetHash(n uint64) common.Hash {
return common.BytesToHash(crypto.Sha3([]byte(big.NewInt(int64(n)).String())))
}
func (self *Env) AddLog(log state.Log) {
self.logs = append(self.logs, log)
}
func (self *Env) Depth() int { return self.depth }
func (self *Env) SetDepth(i int) { self.depth = i }
func (self *Env) Transfer(from, to vm.Account, amount *big.Int) error {
if self.skipTransfer {
// ugly hack
if self.initial {
self.initial = false
return nil
}
if from.Balance().Cmp(amount) < 0 {
return errors.New("Insufficient balance in account")
}
return nil
}
return vm.Transfer(from, to, amount)
}
func (self *Env) vm(addr *common.Address, data []byte, gas, price, value *big.Int) *core.Execution {
exec := core.NewExecution(self, addr, data, gas, price, value)
return exec
}
func (self *Env) Call(caller vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
if self.vmTest && self.depth > 0 {
caller.ReturnGas(gas, price)
return nil, nil
}
exe := self.vm(&addr, data, gas, price, value)
ret, err := exe.Call(addr, caller)
self.Gas = exe.Gas
return ret, err
}
func (self *Env) CallCode(caller vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
if self.vmTest && self.depth > 0 {
caller.ReturnGas(gas, price)
return nil, nil
}
caddr := caller.Address()
exe := self.vm(&caddr, data, gas, price, value)
return exe.Call(addr, caller)
}
func (self *Env) Create(caller vm.ContextRef, addr *common.Address, data []byte, gas, price, value *big.Int) ([]byte, error, vm.ContextRef) {
exe := self.vm(addr, data, gas, price, value)
if self.vmTest {
caller.ReturnGas(gas, price)
nonce := self.state.GetNonce(caller.Address())
obj := self.state.GetOrNewStateObject(crypto.CreateAddress(caller.Address(), nonce))
return nil, nil, obj
} else {
return exe.Create(caller)
}
}
func RunVm(state *state.StateDB, env, exec map[string]string) ([]byte, state.Logs, *big.Int, error) {
var (
to = common.HexToAddress(exec["address"])
from = common.HexToAddress(exec["caller"])
data = FromHex(exec["data"])
gas = common.Big(exec["gas"])
price = common.Big(exec["gasPrice"])
value = common.Big(exec["value"])
)
// Reset the pre-compiled contracts for VM tests.
vm.Precompiled = make(map[string]*vm.PrecompiledAccount)
caller := state.GetOrNewStateObject(from)
vmenv := NewEnvFromMap(state, env, exec)
vmenv.vmTest = true
vmenv.skipTransfer = true
vmenv.initial = true
ret, err := vmenv.Call(caller, to, data, gas, price, value)
return ret, vmenv.logs, vmenv.Gas, err
}
func RunState(statedb *state.StateDB, env, tx map[string]string) ([]byte, state.Logs, *big.Int, error) {
var (
keyPair, _ = crypto.NewKeyPairFromSec([]byte(common.Hex2Bytes(tx["secretKey"])))
data = FromHex(tx["data"])
gas = common.Big(tx["gasLimit"])
price = common.Big(tx["gasPrice"])
value = common.Big(tx["value"])
caddr = common.HexToAddress(env["currentCoinbase"])
)
var to *common.Address
if len(tx["to"]) > 2 {
t := common.HexToAddress(tx["to"])
to = &t
}
// Set pre compiled contracts
vm.Precompiled = vm.PrecompiledContracts()
snapshot := statedb.Copy()
coinbase := statedb.GetOrNewStateObject(caddr)
coinbase.SetGasPool(common.Big(env["currentGasLimit"]))
message := NewMessage(common.BytesToAddress(keyPair.Address()), to, data, value, gas, price)
vmenv := NewEnvFromMap(statedb, env, tx)
vmenv.origin = common.BytesToAddress(keyPair.Address())
ret, _, err := core.ApplyMessage(vmenv, message, coinbase)
if core.IsNonceErr(err) || core.IsInvalidTxErr(err) {
statedb.Set(snapshot)
}
statedb.Update(vmenv.Gas)
return ret, vmenv.logs, vmenv.Gas, err
}
type Message struct {
from common.Address
to *common.Address
value, gas, price *big.Int
data []byte
}
func NewMessage(from common.Address, to *common.Address, data []byte, value, gas, price *big.Int) Message {
return Message{from, to, value, gas, price, data}
}
func (self Message) Hash() []byte { return nil }
func (self Message) From() (common.Address, error) { return self.from, nil }
func (self Message) To() *common.Address { return self.to }
func (self Message) GasPrice() *big.Int { return self.price }
func (self Message) Gas() *big.Int { return self.gas }
func (self Message) Value() *big.Int { return self.value }
func (self Message) Nonce() uint64 { return 0 }
func (self Message) Data() []byte { return self.data }
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