コード例 #1
0
func RunState(ruleSet RuleSet, statedb *state.StateDB, env, tx map[string]string) ([]byte, vm.Logs, *big.Int, error) {
	var (
		data  = common.FromHex(tx["data"])
		gas   = common.Big(tx["gasLimit"])
		price = common.Big(tx["gasPrice"])
		value = common.Big(tx["value"])
		nonce = common.Big(tx["nonce"]).Uint64()
	)

	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.Snapshot()
	gaspool := new(core.GasPool).AddGas(common.Big(env["currentGasLimit"]))

	key, _ := hex.DecodeString(tx["secretKey"])
	addr := crypto.PubkeyToAddress(crypto.ToECDSA(key).PublicKey)
	message := NewMessage(addr, to, data, value, gas, price, nonce)
	vmenv := NewEnvFromMap(ruleSet, statedb, env, tx)
	vmenv.origin = addr
	ret, _, err := core.ApplyMessage(vmenv, message, gaspool)
	if core.IsNonceErr(err) || core.IsInvalidTxErr(err) || core.IsGasLimitErr(err) {
		statedb.RevertToSnapshot(snapshot)
	}
	statedb.Commit()

	return ret, vmenv.state.Logs(), vmenv.Gas, err
}
コード例 #2
0
// ContractCall implements ContractCaller.ContractCall, executing the specified
// contract with the given input data.
func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
	// Create a copy of the current state db to screw around with
	var (
		block   *types.Block
		statedb *state.StateDB
	)
	if pending {
		block, statedb = b.pendingBlock, b.pendingState
		defer statedb.RevertToSnapshot(statedb.Snapshot())
	} else {
		block = b.blockchain.CurrentBlock()
		statedb, _ = b.blockchain.State()
	}
	// If there's no code to interact with, respond with an appropriate error
	if code := statedb.GetCode(contract); len(code) == 0 {
		return nil, bind.ErrNoCode
	}
	// Set infinite balance to the a fake caller account
	from := statedb.GetOrNewStateObject(common.Address{})
	from.SetBalance(common.MaxBig)

	// Assemble the call invocation to measure the gas usage
	msg := callmsg{
		from:     from,
		to:       &contract,
		gasPrice: new(big.Int),
		gasLimit: common.MaxBig,
		value:    new(big.Int),
		data:     data,
	}

	// Execute the call and return
	vmenv := core.NewEnv(statedb, chainConfig, b.blockchain, msg, block.Header(), vm.Config{})
	gaspool := new(core.GasPool).AddGas(common.MaxBig)

	out, _, err := core.ApplyMessage(vmenv, msg, gaspool)
	return out, err
}